CN101166225A - Image processing apparatus and image processing method - Google Patents
Image processing apparatus and image processing method Download PDFInfo
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- CN101166225A CN101166225A CNA2007101642509A CN200710164250A CN101166225A CN 101166225 A CN101166225 A CN 101166225A CN A2007101642509 A CNA2007101642509 A CN A2007101642509A CN 200710164250 A CN200710164250 A CN 200710164250A CN 101166225 A CN101166225 A CN 101166225A
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Abstract
The invention provides an image processing apparatus and image processing method. The image processing apparatus includes a hue specifying unit, a pixel extracting unit and a luminance data converting unit. The hue specifying unit generates hue specification information that specifies a hue to be converted on the basis of a user operation. The pixel extracting unit extracts pixels having a hue specified by the hue specification information from the color image on the basis of the hue obtained from chromaticity data. The luminance data converting unit carries out processing on the luminance data of the pixels extracted in the pixel extracting step using a function which lowers the upper limit value of luminance and increases in a monotone within a predetermined range including the upper limit value to convert the luminance value, so that a monochrome image is generated from the color image.
Description
Technical field
The present invention relates to image processing apparatus, more specifically relate to the improvement to following image processing apparatus, described image processing apparatus carries out image processing to camera heads such as scanners from the coloured image that original copy reads, the output black and white image.
The application advocates Japanese patent application 2006-284811 number and Japanese patent application 2006-284810 number the priority that proposed on October 19th, 2006 in proposition on October 19th, 2006, and quotes its full content at this.
Background technology
People have proposed a kind of image read-out in recent years, and it is removed the object of representing with particular color and reads original copy etc.In this image read-out, generate reading images as follows:, do not read object with this color showing for preassigned color.Can from reading images, remove thus in original copy with what described particular color, for example red ink were printed and insert object such as frame.
In addition, people have also proposed a kind of image processing apparatus recently, it makes the user specify form and aspect, chroma, lightness and brightness, and the luminance component that will be present in the pixel in the scope of form and aspect, chroma, lightness, brightness of this appointment is transformed to white level (higher limit of brightness).
In addition, people have also proposed a kind of image processing apparatus in recent years, and for the coloured image that reads from original copy, it becomes specific colour switching white level and generate black and white image.Image processing apparatus comprises: become white level from the color specifying part of the image reading unit of original copy reading images, designated color and with specified colour switching and generate the image processing part of black and white image.In the 1st image processing apparatus, extract the pixel in the scope that is in preassigned form and aspect, chroma, lightness, this pixel is carried out luminance component is transformed into the processing of white level.Thus, the black and white image that can obtain the pixel albefaction of particular color from coloured image can be removed from view data in original copy with what described particular color, for example red ink were printed and insert object such as frame.
On the other hand, people have also proposed a kind of colour print device, and it increases the chroma that form and aspect are in the pixel in the prescribed limit, emphasize that specific form and aspect come the printing color image.In this colour print device, specify the scope of the form and aspect that make the chroma increase in advance, the chroma that makes form and aspect be in the pixel in this scope increases, and improves the print quality of coloured image thus.
For the view data after the image processing, usually, the contrast of representing its luminance component is by 2 values, and carries out the printing of the black and white image be made up of 2 Value Datas of each pixel.When 2 values of carrying out luminance component, change in order to be worth the many-valued contrast of reproducing black and white with 2, show with enforcement simulation contrasts such as shake (dither) methods and handle (middle tone shows processing).In such image processing apparatus, for the luminance component of the pixel in the scope of form and aspect, chroma, lightness and the brightness of user's appointment not, be not transformed to the conversion process of white level, only the luminance component of the pixel in the scope of this user's appointment be transformed to the conversion process of white level.Therefore, for form and aspect, chroma, lightness or brightness luminance component near the pixel of described user's specified scope, do not carry out albefaction and handle and export as view data, therefore there are the following problems: when printing black and white image, the border of the scope of user's appointment is very eye-catching, produces inharmonious sense.
Summary of the invention
The present invention In view of the foregoing makes, and its 1st purpose is to provide a kind of image processing apparatus, and it can not produce inharmonious sense when printing from coloured image that original copy reads in the black and white mode, make suitably albefaction of particular color.Particularly, its purpose is to provide a kind of image processing apparatus, when it is transformed to the conversion process of white level at the coloured image that brightness data and chroma data by each pixel are constituted,, when printing, can suppresses the black and white border and become eye-catching for the pixel of the form and aspect of user's appointment.In addition, its purpose is to provide a kind of image processing apparatus, and it can suppress the form and aspect of user's appointment and become eye-catching near the border between the form and aspect of these form and aspect in color space.
When the coloured image that camera heads such as utilizing color scanner is read from original copy is printed on the print paper in the black and white mode, print just very convenient with the privileged sites such as literal that red pen is write if on the original copy of printing with black, can emphasize.Particularly, if can deepen to be emphasized, and make thin out the printing in other positions of printing, even black and white image then with black with the privileged sites such as literal that redness is write, also can discern position of being write with redness and the position of printing with black, very convenient.
The present invention makes in view of described situation, and its 2nd purpose is to provide a kind of image processing apparatus, and it can be emphasized the position of being write with particular color when printing from coloured image that original copy reads in the black and white mode.Particularly, its purpose is to provide a kind of image processing apparatus, and when the coloured image that constitutes from brightness data and chroma data by each pixel obtained black and white image, it can emphasize the pixel of the form and aspect of user's appointment.In addition, its purpose is to provide a kind of image processing apparatus, and it can suppress the form and aspect of user's appointment and become eye-catching near the border between the form and aspect of these form and aspect in color space.
In order to reach the 1st purpose, image processing apparatus carries out image processing to the coloured image that brightness data and the chroma data by each pixel that reads from original copy constitutes, the output black and white image.Image processing apparatus comprises: form and aspect specifying part, pixel extraction portion and brightness data transformation component.The form and aspect specifying part is operated according to the user, generates the form and aspect appointed information, and this form and aspect appointed information is specified the form and aspect as transforming object.Pixel extraction portion is according to the form and aspect that obtain from described chroma data, from the pixel of described coloured image extraction by the specified form and aspect of described form and aspect appointed information.The brightness data transformation component is to the described brightness data of the pixel extracted by described pixel extraction portion, make the conversion process that the brightness value that is higher than the 1st threshold value is saturated, make the brightness value increase that is lower than described the 1st threshold value, generate described black and white image from described coloured image.
In this image processing apparatus, operate generation form and aspect appointed information according to the user, from the pixel of coloured image extraction by the specified form and aspect of form and aspect appointed information, this coloured image reads from original copy.Then, carry out the brightness data of the pixel extracted is carried out the processing of conversion, generate black and white image from coloured image.The conversion process of this brightness data is following processing: make the brightness value that is higher than the 1st threshold value saturated, the brightness value that is lower than the 1st threshold value is increased.According to such structure, pixel for the form and aspect of user's appointment, brightness data is carried out conversion according to its brightness value, and the brightness value that is higher than the 1st threshold value is changed to the higher limit of brightness, therefore the border of black and white becomes eye-catching in the time of suppressing to print black and white image, and can make specific form and aspect albefaction.
In addition, image processing apparatus constitutes: described brightness data transformation component makes brightness value in the scope from lower limit to described the 1st threshold value corresponding to this brightness value being multiply by the value that obtains behind the fixed number.
In addition, image processing apparatus constitutes: described brightness data transformation component makes the brightness value that is higher than described the 1st threshold value saturated, make to be higher than the brightness value increase that is lower than described the 1st threshold value than the 2nd little threshold value of the 1st threshold value, make the brightness value that is lower than described the 2nd threshold value corresponding to same brightness.
In addition, image processing apparatus constitutes: described pixel extraction portion is according to the form and aspect that obtain from described chroma data, when coloured image extracts pixel, extracts the pixel of chroma greater than the 3rd threshold value, and do not extract the pixel of chroma less than described the 3rd threshold value.According to such structure, only chroma is extracted processing greater than the pixel of the 3rd threshold value as extracting object, therefore can prevent that the little pixel of the chroma different with the form and aspect of user's appointment from being extracted by mistake.
In addition, image processing apparatus has 2 value handling parts, this 2 value handling part will be compared by brightness value and the 4th threshold value that described brightness data transformation component has carried out the brightness data after the conversion process, generate 2 Value Datas according to its comparative result, this image processing apparatus constitutes the described black and white image that output is made of described 2 Value Datas of each pixel.
In addition, image processing apparatus has luminance compensation portion, this luminance compensation portion carries out following processing to having carried out the brightness data after the conversion process by described brightness data transformation component: make the brightness value that is present in the 1st scope that comprises lower limit be transformed to described lower limit, perhaps, make the brightness value that is present in the 2nd scope that comprises higher limit be transformed to described higher limit; Described 2 value handling parts generate described 2 Value Datas according to having carried out the brightness data after the conversion process by described luminance compensation portion.
In addition, image processing apparatus has the neighboring area specifying part, this neighboring area specifying part generates the neighboring area appointed information according to described form and aspect appointed information, and this neighboring area appointed information is specified by the neighboring area in the color space of the form and aspect of described form and aspect appointed information appointment; Described brightness data transformation component, to pixel by the specified neighboring area of described neighboring area appointed information, to compare with described conversion process, reduce to make the mode of the ratio that its brightness value increases to come the conversion brightness data, generate described black and white image from described coloured image.According to such structure, pixel for the neighboring area of the form and aspect of user's appointment, therefore also conversion brightness data rightly can suppress the form and aspect of user's appointment and become eye-catching near the border between the form and aspect of these form and aspect when the printing black and white image in color space.
In order to reach the 2nd purpose, image processing apparatus carries out image processing to the coloured image that brightness data and the chroma data by each pixel that reads from original copy constitutes, the output black and white image.Image processing apparatus comprises form and aspect specifying part, pixel extraction portion and brightness data transformation component.The form and aspect specifying part is operated according to the user, generates the form and aspect appointed information, and this form and aspect appointed information is specified the form and aspect as transforming object.Pixel extraction portion is according to the form and aspect that obtain from described chroma data, from the pixel of described coloured image extraction by the specified form and aspect of described form and aspect appointed information.The brightness data transformation component is to the described brightness data of the pixel extracted by described pixel extraction portion, the higher limit of brightness is reduced and use in comprising the prescribed limit of higher limit monotonically increasing function that brightness value is carried out the processing of conversion, generate described black and white image from described coloured image.
In this image processing apparatus, operate generation form and aspect appointed information according to the user, from the pixel of coloured image extraction by the specified form and aspect of form and aspect appointed information, this coloured image reads from original copy.Then, carry out the brightness data of the pixel extracted is carried out the processing of conversion, generate black and white image from coloured image.The conversion process of this brightness data is to reduce by the higher limit that makes brightness, and uses that the monotonically increasing function carries out in comprising the prescribed limit of higher limit.According to such structure, for the pixel of the form and aspect of user's appointment, also can reduce near the brightness value the higher limit, therefore printable when printing black and white image must be darker, this position is emphasized.
In addition, image processing apparatus constitutes: described brightness data transformation component makes brightness value corresponding to this brightness value being multiply by the value that obtains behind the fixed number.
In addition, image processing apparatus constitutes: described brightness data transformation component makes the brightness value that is present in the scope of lower limit to the 1 threshold value corresponding to lower limit, makes brightness value in being present in from described the 1st threshold value to the scope of higher limit corresponding to deduct the value that obtains behind the fixed number from this brightness value.
In addition, image processing apparatus constitutes: described pixel extraction portion is according to the form and aspect that obtain from described chroma data, when coloured image extracts pixel, extracts the pixel of chroma greater than the 2nd threshold value, and do not extract the pixel of chroma less than described the 2nd threshold value.According to such structure, only chroma is extracted processing greater than the pixel of the 2nd threshold value as extracting object, therefore can prevent that the little pixel of the chroma different with the form and aspect of user's appointment from being extracted by mistake.
In addition, image processing apparatus has 2 value handling parts, this 2 value handling part will be compared by brightness value and the 3rd threshold value that described brightness data transformation component has carried out the brightness data after the conversion process, generate 2 Value Datas according to its comparative result, this image processing apparatus constitutes: the described black and white image that output is made of described 2 Value Datas of each pixel.
In addition, image processing apparatus has luminance compensation portion, this luminance compensation portion carries out following processing to having carried out the brightness data after the conversion process by described brightness data transformation component: make the brightness value that is present in the 1st scope that comprises lower limit be transformed to described lower limit, perhaps, make the brightness value that is present in the 2nd scope that comprises higher limit be transformed to described higher limit; Described 2 value handling parts generate described 2 Value Datas according to having carried out the brightness data after the conversion process by described luminance compensation portion.
In addition, image processing apparatus constitutes: for by the pixel beyond the specified form and aspect of described form and aspect appointed information, described brightness data transformation component increases its brightness value.
In addition, image processing apparatus has the neighboring area specifying part, this neighboring area specifying part is according to described form and aspect appointed information, generate the neighboring area appointed information, this neighboring area appointed information is specified by the neighboring area in the color space of the specified form and aspect of described form and aspect appointed information, described brightness data transformation component, to pixel by the specified neighboring area of described neighboring area appointed information, to compare with described conversion process, reduce to make the mode of the ratio that its brightness value increases to come the conversion brightness data, generate described black and white image from described coloured image.According to such structure, pixel for the neighboring area of the form and aspect of user's appointment, therefore also conversion brightness data rightly can suppress the form and aspect of user's appointment and become eye-catching near the border between the form and aspect of these form and aspect when the printing black and white image in color space.
According to image processing apparatus of the present invention, pixel for the form and aspect of user's appointment, brightness data is carried out conversion according to its brightness value, and the brightness value that is higher than the 1st threshold value changed to the higher limit of brightness, and the black and white border becomes eye-catching in the time of therefore suppressing the printing black and white image.In addition, for the pixel of the neighboring area of the form and aspect of user's appointment, therefore also conversion brightness data rightly can suppress the form and aspect of user's appointment and become eye-catching near the border between the form and aspect of these form and aspect when the printing black and white image in color space.Therefore, can when printing in the black and white mode, not produce inharmonious sense, make particular color albefaction rightly from coloured image that original copy reads.
According to image processing apparatus of the present invention, the pixel for the form and aspect of user's appointment reduces its brightness value, therefore can print specific form and aspect darker when printing black and white image, and this position is emphasized.For the pixel of the neighboring area of the form and aspect of user's appointment, therefore also conversion brightness data rightly can suppress the form and aspect of user's appointment and become eye-catching near the border between the form and aspect of these form and aspect when the printing black and white image in color space.Therefore, when printing in the black and white mode, can emphasize the position of being write with particular color from coloured image that original copy reads.
By following detailed description of preferred implementation of the present invention being carried out with reference to accompanying drawing, it is clearer that further feature of the present invention, member, process, step, characteristic and advantage can become.
Description of drawings
Fig. 1 shows the block diagram of an example of schematic configuration of the image processing apparatus of embodiment of the present invention 1, shows digital compounding machine 100 as an example of image processing apparatus.
Fig. 2 shows the block diagram of structure example of color scanner portion 10 of the digital compounding machine 100 of Fig. 1.
Fig. 3 shows the block diagram of the structure example of wanting portion of the digital compounding machine 100 of Fig. 1, illustrates an example of the functional structure of image processing part 20.
Fig. 4 shows the block diagram of the structure example of the black and white image generating unit 23 in the image processing part 20 of Fig. 3.
Fig. 5 shows the figure of an example of action of the image processing part 20 of Fig. 3, shows the color space that makes user's bulletin colour phase time be adopted.
Fig. 6 shows the figure of an example of action of the image processing part 20 of Fig. 3, illustrates form and aspect zone A1 and neighboring area A2 by user's appointment.
Fig. 7 shows the figure of an example of action of the image processing part 20 of Fig. 3, the curve B 2 and the B3 of employed map table when illustrating the expression albefaction.
Fig. 8 shows the figure of an example of action of the image processing part 20 of Fig. 3, illustrates the curve C 1 that is illustrated in the employed map table of luminance compensation that is used for removing denoising.
Fig. 9 shows the flow chart of an example of action of the image processing part 20 of Fig. 3.
Figure 10 shows the figure of an example of action of the image processing part 20 of Fig. 3, illustrates another routine curve B 4 of the map table that uses when being illustrated in albefaction.
Figure 11 shows the figure of an example of action of the image processing part 20 of Fig. 3, illustrates another routine curve B 5 of the map table that uses when albefaction.
Figure 12 shows the figure of an example of action of the image processing apparatus of embodiment of the present invention 2, illustrates the curve D 1 and the D2 that are illustrated in the map table that the Accent colour phase time uses.
Figure 13 shows the figure of an example of action of the image processing apparatus of embodiment of the present invention 2, illustrates another the routine curve D 3 that is illustrated in the map table that the Accent colour phase time uses.
Embodiment
Fig. 1 shows the block diagram of an example of schematic configuration of the image processing apparatus of embodiment of the present invention 1, as an example of image processing apparatus, illustrates digital compounding machine 100, and it comprises: color scanner portion 10, image processing part 20 and printer portion 30.Color scanner portion 10 is camera heads, to the original copy irradiates light as reading object, receives and generates view data by the reverberation due to this original copy.At this, the paper feeding direction scanning irradiates light by at original copy (paper) reads handwriting and print pattern on the original copy.In addition, generate the color image data that the brightness data by at least three kinds of different colours constitutes.
32 pairs of printer organizations of drive control part are controlled, and this printer organization comprises photosensitive drums 33, charged device 34, development section 35, transfer printing portion 36 and photographic fixing portion 37.Photosensitive drums 33 is the cylindric rotary bodies that are formed with photoreceptor layers from the teeth outwards, during printing, and under the effect of charged device 34, surperficial uniform charged.By with rayed like this with the surface of electric photosensitive drums 33, form electrostatic latent image.
Fig. 2 shows the block diagram of structure example of color scanner portion 10 of the digital compounding machine 100 of Fig. 1.This color scanner portion 10 comprises line sensor 11, AFE circuit 12, A/D converter 13, shading compensation circuit 14, checking gamma circuit 15 and color notation conversion space circuit 16.Charge coupled cell) etc. line sensor 11 has that (Charge Coupled Device: a plurality of photo detectors are configured in that straight line L goes up and the photodetector array that forms with CCD, it carries out following such action: R (red), G (green) and each color of B (indigo plant) are generated the analog signal of representing light income (brightness), such as voltage signal.
(Analog Front End: AFE (analog front end)) circuit 12 is amplifiers to AFE, outputs it to A/D converter 13 after adjusting from the voltage level of the analog signal of line sensor 11 input.A/D converter 13 is inverting elements, with the sampling rate of regulation the analog signal of importing from AFE circuit 12 is taken a sample, and generates numerical data.At this,, generate the brightness data of forming by the bit data of 8 (256 contrasts) to each color of R, G, B.
γ (gamma) correcting circuit 15 is the digital processing circuits that carry out the γ treatment for correcting, to carrying out the color adjustment from R, the G of shading compensation circuit 14 inputs, the brightness data of B.Such as, to depending on the RGB color space of device, the color specification system " sRGB (standard RGB) " according to international standards carries out the color adjustment of brightness data.The RGB color space be 3 primary colors that adopt light (R, G, employed color space when B) showing addition colour mixture, numerical value increases more, approaching more white.The input-output equipment that the sRGB color specification system is scanned various images such as instrument, digital camera, printer, display adopts, by carry out the color adjustment according to the sRGB color specification system, and the difference of the color in the time of reducing when input and output.
Color notation conversion space circuit 16 is digital processing circuits, and R, G, B brightness data from checking gamma circuit 15 inputs are carried out color notation conversion space and export color image data.Specifically, carry out the RGB color notation conversion space is become the processing of the color space (for example, YCbCr color specification system) that constitutes by brightness and form and aspect.The color specification system that the YCbCr color specification system is adopted by view data of JPEG form etc., Y represents brightness data, CbCr represents chroma data.In this chroma data CbCr, Cb represents that blue aberration (form and aspect component), Cr represent red aberration (form and aspect component).By this color notation conversion space circuit 16, generate the color image data that brightness data and chroma data by each pixel constitute.
Also can be transformed into Lab color specification system, and not be transformed into the YCbCr color specification system as one of impartial color space.In the Lab color specification system, L represents brightness data, and ab represents chroma data respectively.In this chroma data ab, a and b represent the form and aspect component respectively.In addition, the L component in the Lab color specification system is commonly called lightness.Brightness data in this specification comprises the L component data of Lab color specification system, i.e. lightness data.
Fig. 3 shows the block diagram of the structure example of wanting portion of the digital compounding machine 100 of Fig. 1, illustrates an example of the functional structure of image processing part 20.This image processing part 20 comprises form and aspect specifying part 21, neighboring area specifying part 22, black and white image generating unit 23, map table storage part 24, neighboring area map table storage part 25, luminance compensation portion 26 and 2 value handling parts 27.Form and aspect specifying part 21 is carried out following such action: according to user's operation, generate the form and aspect appointed information, this form and aspect appointed information is specified the form and aspect as the transforming object of brightness value.
In these form and aspect are specified, can distinguish different form and aspect component Cb and the Cr that specify independently in the YCbCr color specification system.At this, color space is divided into a plurality of form and aspect zone in advance, selects in these form and aspect zones one by the user.
Neighboring area specifying part 22 is carried out following action: according to the form and aspect appointed information from form and aspect specifying part 21, generate the neighboring area appointed information, this neighboring area appointed information is specified by the neighboring area in the color space of the form and aspect of this form and aspect appointed information appointment.By the specified neighboring area of this neighboring area appointed information be not with the zone of repeating by the specified form and aspect of user zone.
Map table storage part 24 is the memories that are used for memory-map list, and this map table is used to make the brightness value that is higher than the 1st threshold value saturated, and the brightness value that is lower than the 1st threshold value is increased.This map table is the correspondence relationship information of the corresponding relation of regulation brightness value, at this, store map table in advance, this map table will be present in brightness input value before the conversion process in lower limit to the 1 threshold range and multiply by the brightness output valve of the resulting value of a fixed number after as conversion process.
Neighboring area map table storage part 25 is memories, is used to store make ratio that brightness value the increases neighboring area map table less than described map table.
Black and white image generating unit 23 is carried out following such processing: extract pixel according to form and aspect appointed information and neighboring area appointed information from color image data, according to map table and neighboring area map table the brightness data of the pixel extracted is carried out conversion and generate the black and white image data.
26 pairs of black and white image data from black and white image generating unit 23 of luminance compensation portion compensate the processing of brightness, to remove noise.Specifically, brightness data is carried out following processing: the brightness value that will be present in the 1st scope that comprises lower limit is transformed to described lower limit, and the brightness value that will be present in the 2nd scope that comprises higher limit is transformed to described higher limit.
Before handling, luminance compensation carries out following processing: extract pixel from coloured image, its brightness data of conversion and generate black and white image.Can accurately carry out form and aspect thus and judge, be i.e. the judgement in the form and aspect zone under the form and aspect represented of chroma data.
27 pairs of 2 value handling parts have carried out the brightness data after the conversion process by luminance compensation portion 26, reduce the contrast number and the processing of 2 values.Specifically, the brightness value and the defined threshold (the 4th threshold value) of brightness data compared, generate 2 Value Datas according to its comparative result.Black and white image data 27 that generated by this 2 value handling part, that be made of 2 Value Datas of each pixel are exported to led print head 31.
At this, with luminance component 2 values the time,, show with enforcement simulation contrasts such as ditherings and handle (middle tone shows processing) for the many-valued contrast of reproducing black and white with 2 values changes.It is that each block that is made of a plurality of pixels is determined the threshold value that 2 values are used and obtained the image processing of black and white image data that the simulation contrast show to be handled.
Fig. 4 shows the block diagram of the structure example of the black and white image generating unit 23 in the image processing part 20 of Fig. 3.This black and white image generating unit 23 comprises: chroma data extraction unit 1, pixel extraction portion 2, brightness data extraction unit 3 and brightness data transformation component 4.Chroma data extraction unit 1 carries out extracting from color image data the action of chroma data.Specifically, extract chroma data CbCr from the color image data (being YCbCr) that color notation conversion space circuit 16, generates here, and export to pixel extraction portion 2.
Specifically, the form and aspect zone in the color space under this pixel is differentiated, extracted the consistent pixel in form and aspect zone with user's appointment according to the form and aspect component that chroma data CbCr is comprised.Also extract with by the regional consistent pixel of the specified form and aspect of neighboring area appointed information.
Brightness data extraction unit 3 carries out extracting from color image data the action of brightness data.Specifically, extract brightness data Y from the color image data YCbCr that is generated at color notation conversion space circuit 16, and export to brightness data transformation component 4.
Brightness data transformation component 4 comprises emphasizes handling part 5 and brightness selection portion 6, and it carries out following such action: according to map table the brightness data of the pixel extracted by pixel extraction portion 2 is carried out conversion, generate the black and white image data from color image data.
Emphasize that handling part 5 carries out following such processing: according to map table of reading from map table storage part 24 and the neighboring area map table read from neighboring area map table storage part 25, brightness data Y is carried out conversion, generate the 1st brightness data and the 2nd brightness data that brightness value has been increased.Specifically, according to map table brightness value is carried out conversion and generate the 1st brightness data.In addition, according to the neighboring area map table brightness value is carried out conversion and generate the 2nd brightness data.
In the present embodiment, when the brightness data to the pixel extracted by pixel extraction portion 2 carries out conversion process, the map table of the corresponding relation of brightness value has been stipulated in employing, also can adopt computing circuit to handle with hardware mode, and software processes that need not be such.
Fig. 5 shows the figure of an example of action of the image processing part 20 of Fig. 3, illustrates the color space that makes user's bulletin colour phase time be adopted.This color space is the color space of YCbCr color specification system, and the Cb axle is configured on the longitudinal axis, and the Cr axle is configured on the transverse axis.If Cb divides quantitative change big, then blueness deepen, if diminish, then yellow deepens.In addition, if Cr divides quantitative change big, then redness deepens, if diminish, then green deepens.
At this, utilize 6 straight lines 51～56, Cb axle and Cr axle by initial point, color space is divided into 16 form and aspect zones.In addition, the input range of Cb component is consistent with the input range of Cr component.
Straight line 51 expression slopes are that 2 straight line Cb=2Cr, straight line 52 expression slopes are that 1 straight line Cb=Cr, straight line 53 expression slopes are 1/2 straight line Cb=(1/2) Cr.In addition, straight line 54 expression slopes are that straight line (2) Cb=Cr, the straight line 55 expression slopes of (1)/2 are the straight line Cb=-Cr of (1), and straight line 56 expression slopes are straight line Cb=(2) Cr of (2).The alpha region of being divided by these straight lines 51～56 of all kinds is the zone that area is equal to each other.
Near the initial point of color space zone is the less netrual colour zone 57 of absolute value of form and aspect component.This netrual colour (black and white tone) zone 57 is zones of the lower form and aspect of expression chroma, is stipulated by the prescribed relationship formula of setting up between form and aspect component Cb and the Cr.In this embodiment, as being the inside of the circle at center with the initial point, represent netrual colour zone 57.
Such netrual colour zone 57 is got rid of from the form and aspect as the transforming object of brightness value.That is to say, when coloured image extracts pixel, only extract chroma than the big pixel of defined threshold (the 3rd threshold value), and do not extract the chroma pixel littler than this threshold value according to chroma data.
To such color space, specify the change brightness value and from the form and aspect zone and the neighboring area of black and white image albefaction.
Fig. 6 shows the figure of an example of action of the image processing part 20 of Fig. 3, illustrates specified form and aspect zone A1 and neighboring area A2 by the user.In this embodiment, the form and aspect zone A1 that straight line 52 in the 1st quadrant and straight line are 53 is specified by the user, and two the form and aspect zones adjacent with this form and aspect zone A1 are designated as neighboring area A2.That is to say, as long as specify a form and aspect zone A1, then according to position or the division of these form and aspect zone A1 in color space, automatically designated perimeter zone A2 by the user.
In black and white image generating unit 23, carry out following such processing: according to map table the brightness data that form and aspect belong to the pixel of form and aspect zones A1 is carried out conversion, and carry out conversion according to the neighboring area map table belongs to the pixel of neighboring area A2 to form and aspect brightness data.
Fig. 7 shows the figure of an example of action of the image processing part 20 of Fig. 3, shows curve B 2 and B3, and this curve B 2 and B3 are illustrated in the change brightness value and make the map table that is adopted in the specific form and aspect albefaction.Curve B 1 is that slope is 1 straight line, makes the curve of the corresponding corresponding relation of output valve of the input value of brightness and same brightness for expression.
In this example, the proportionality coefficient (slope of straight line) of the curve B 2 in the scope of lower limit 0 to the 1st threshold value a1 is 4, and 1/4 of higher limit 255 is the 1st threshold value a1.
Curve B 3 is broken lines, and the neighboring area map table that is adopted when expression is carried out conversion to the brightness data of the pixel that belongs to the neighboring area is compared with curve B 2, and the ratio that brightness value is increased diminishes.Specifically, make from threshold value a2 to higher limit brightness input value in 255 the scope, make from lower limit 0 to threshold value a2 (﹠amp corresponding to output valve 255; Gt; A1) the brightness input value in the scope corresponding to the output valve of the proportional increase of brightness.The proportionality coefficient of the curve B 3 in the scope from lower limit 0 to threshold value a2 is greater than 1, and less than the proportionality coefficient of curve B 2.
In this example, the proportionality coefficient of the curve B 3 in the scope from lower limit 0 to threshold value a2 is 2, and 1/2 of higher limit 255 is threshold value a2.
In black and white image generating unit 23, according to such curve B 2, the represented map table of B3, carry out the processing of conversion brightness data, the brightness data after the conversion process is exported as the black and white image data.
Fig. 8 shows the figure of an example of action of the image processing part 20 of Fig. 3, shows curve C 1, and this curve C 1 is illustrated in the map table that luminance compensation adopted that is used for removing denoising.This curve C 1 makes in the 1st scope that is present in the lower limit 0 that comprises brightness, promptly the brightness value in the following scope of 0 above b1 is corresponding to lower limit 0, make be present in the 2nd scope that comprises higher limit 255, be more than the b2 the interior brightness value of the scope below 255 corresponding to higher limit 255.In addition, curve C 1 makes brightness value in the following scope of the above b2 of b1 corresponding to the brightness value of certain several times of the difference of itself and b1.
In luminance compensation portion 26, the black and white image data that generated by black and white image generating unit 23 are carried out conversion process, this conversion process is based on that such curve C 1 represented map table carries out.According to such map table brightness is compensated, make that the brightness value of close higher limit is saturated, the brightness value of close lower limit is transformed to lower limit, therefore can suppress in black and white image: the black of spread noise shape in the white portion, perhaps, the white of spread noise shape in the black region.
The step S101 of Fig. 9～S108 shows the flow chart of an example of action of the image processing part 20 of Fig. 3.At first, as long as specified form and aspect zone as the transforming object of brightness value by the user, form and aspect specifying part 21 just generates form and aspect appointed information (step S101).The form and aspect appointed information is after 21 inputs of form and aspect specifying part, and neighboring area specifying part 22 generates the neighboring area appointed information according to this form and aspect appointed information.
Then, after having imported form and aspect appointed information and neighboring area appointed information, black and white image generating unit 23 reads color image data from color scanner portion 10,, and extract and belong to by the pixel in the specified form and aspect zone of form and aspect appointed information and belong to whether being that the pixel that belongs to the appointed area is judged according to the form and aspect component of chroma data by the pixel of the specified neighboring area of neighboring area appointed information (step S102～S104).
At this moment, the brightness data of 23 pairs of pixels of being extracted of black and white image generating unit, the conversion process based on map table carries out brightness generates black and white image data (step S105).
Then, after having imported the black and white image data from black and white image generating unit 23,26 pairs of these black and white image data of luminance compensation portion are used for removing the luminance compensation processing (step S106) of denoising.Then, the black and white image data after 27 pairs of compensation deals of 2 value handling parts reduce the processing of contrast number, and as 2 Value Datas outputs (step S107, S108).
Figure 10 shows the figure of an example of action of the image processing part 20 of Fig. 3, shows curve B 4, and this curve B 4 is illustrated in the change brightness value and another example of the map table that adopted when making specific form and aspect albefaction.This curve B 4 is broken lines, and expression belongs to the map table of pixel in the form and aspect zone of user's appointment.Brightness input value in curve B 4 makes from the 1st threshold value a4 to the scope of higher limit 255 is corresponding to output valve 255, make be higher than the 2nd threshold value a3 littler than the 1st threshold value a4 (such as, 128) and the brightness input value that is lower than the 1st threshold value a4 increase, make brightness input value in the scope of lower limit 0 to the 2nd threshold value a3 corresponding to same brightness.
At this, the brightness input value in the scope of the 2nd threshold value a3 to the 1 threshold value a4 is corresponding to the output valve of certain several times of the difference of itself and threshold value a3.That is to say that for curve B 4, the slope that makes straight line between lower limit 0 and the 1st threshold value a4 is with 2 sections variations.
Also can adopt by following such curve B 4 represented map tables and come the conversion brightness data, this curve B 4 makes slope change with multistage between the lower limit of brightness and the 1st threshold value.Like this, to the pixel change brightness data of the form and aspect of user's appointment the time, change brightness value in the scope of lower limit to the 1 threshold value with multistage, the black and white border becomes eye-catching in the time of therefore more effectively suppressing to print black and white image.
Figure 11 shows the figure of an example of action of the image processing part 20 of Fig. 3, shows curve B 5, and this curve B 5 is illustrated in the change brightness value and another example of the map table that adopted when making specific form and aspect albefaction.This curve B 5 is broken lines, and expression belongs to the map table of pixel in the form and aspect zone of user's appointment.Brightness input value in curve B 5 makes from the 1st threshold value a6 to the scope of higher limit 255 is corresponding to output valve 255, makes brightness input value X in the scope of lower limit 0 to the 1st threshold value a6 corresponding to the output valve that has increased a certain amount of a5 (X+a5).
In addition, satisfy the relation of a6+a5=255 for curve B 5, the 1 threshold value a6.Also can adopt by such curve B 5 represented map tables and come the conversion brightness data.
According to present embodiment, to the pixel in the form and aspect zone that belongs to user's appointment,, and changed to the higher limit of brightness greater than the brightness value of the 1st threshold value according to its brightness value change brightness data, therefore the black and white border becomes eye-catching in the time of suppressing to print black and white image, and can make specific form and aspect albefaction.
Specifically, suppose: printing on the standardized writing paper with squares or lines of inserting frame, template etc. with the redness of light color, for example high lightness (brightness), when writing literal etc. with the pen of the color identical with inserting frame etc., only make and insert frame and black and white image is printed in the template albefaction, and can not make literal of being write with pen and the object albefaction of printing with black.In the digital compounding machine 100 of present embodiment, can utilize on standardized writing paper with squares or lines the brightness ratio of the literal of being write with pen to insert the situation of frame etc. low (dense), keep handwriting, and suitably carry out albefaction inserting frame and template.
In addition,, chroma is extracted processing greater than the pixel of the 3rd threshold value as extracting object, can prevent that therefore the chroma little pixel different with the form and aspect zone of user's appointment from being extracted by mistake according to present embodiment.
In addition, pixel for the neighboring area in the form and aspect zone of user's appointment, also come the conversion brightness data, therefore can suppress the form and aspect of user's appointment and in color space, when printing black and white image, become eye-catching near the border between the form and aspect of these form and aspect according to the neighboring area map table.
In addition, in the present embodiment, the example that applies the present invention to following digital compounding machine is illustrated, this digital compounding machine has from original copy and reads the scanner functions of coloured image and print the printer function of the black and white image that obtains from the coloured image that is read at print paper, but the present invention is not limited to this.Such as, the present invention also can be applied to have only the image read-out of scanner functions, perhaps has only the printing equipment of printer function.In addition, the present invention also can be applicable to picture unit, the coloured image that this picture unit is used for reading from original copy is transformed to the black and white image data and sends it to communication objective ground, to be transformed to the black and white image data from the color image data that receives communication objectively, and be printed on the print paper.
In addition, in the present embodiment, employed map table when making specific form and aspect albefaction as the change brightness value, adopt the example of any one curve in the curve B 5 of the curve B 4 of curve B 2, Figure 10 of Fig. 7 or Figure 11 to be illustrated, but also can adopt following such structure: employed map table switches to any one in the represented map table of these curves in the time of as required can be with albefaction.In addition, the corresponding relation that also can keep making brightness value is different a plurality of map tables with the difference in form and aspect zone, when the user has specified the form and aspect zone, adopt the conversion process of carrying out brightness value with the regional corresponding map table of these form and aspect.
In addition, in the present embodiment, the example when having illustrated to the pixel selection brightness data Y that do not extracted by pixel extraction portion 2, but the present invention is not limited to this.For example, carry out following processing: the brightness data Y that is extracted is carried out conversion, generate the 3rd brightness data that has reduced brightness value in brightness data extraction unit 3.Also can select the 3rd brightness data to the pixel of not extracted by pixel extraction portion 2.
In addition, in the present embodiment, the example of following situation has been described:, carry out the conversion process of pixel extraction and brightness data according to the color image data YCbCr that in color notation conversion space circuit 16, generates.But the present invention is not limited to this.For example, the present invention also can be applied to the image processing apparatus as the color data of color image data input RGB color space.As color image data, when having imported the RGB data, in chroma data extraction unit 1, according to the RGB data, calculate the aberration (G-R) of colouring component and (G-B), and export as chroma data.In addition, in brightness data extraction unit 3,, and export as brightness data from RGB data extract G component.
In execution mode 1, illustrated that pixel to the form and aspect of user's appointment increases brightness value and make the example of its albefaction when printing black and white image.And in the present embodiment,,, make the situation of brightness value reduction to the pixel of the form and aspect of user's appointment with the position of explanation in order to emphasize to write with particular color.
Figure 12 shows the figure of an example of action of the image processing apparatus of embodiment of the present invention 2, shows curve D 1 and D2, and curve D 1 and D2 are illustrated in the change brightness value and emphasize the map table that the special color phase time is adopted.The relatively image processing apparatus of present embodiment and the digital compounding machine 100 of execution mode 1, difference only are to change the map table difference that is adopted when form and aspect belong to the brightness value of pixel of special color alpha region.Other structures are identical with execution mode 1.
In black and white image generating unit 23, according to such curve D 1, the represented map table of D2, carry out the processing of conversion brightness data, the brightness data after the conversion process is exported as the black and white image data.The map table that conversion process adopted of such brightness data is so long as the function of the corresponding relation of regulation brightness value gets final product for monotonically increasing function in the prescribed limit that comprises higher limit 255.
Figure 13 shows the figure of an example of action of the image processing apparatus of embodiment of the present invention 2, shows curve D 3, and this curve D 3 is illustrated in another example that the change brightness value is emphasized the map table that the special color phase time is adopted.This curve D 3 is broken lines, and expression belongs to the map table of pixel in the form and aspect zone of user's appointment.
Curve D 3 makes the input value of the brightness in the scope of lower limit 0 to the 1st threshold value d2 of brightness corresponding to output valve 0, and the brightness input value X in making from the 1st threshold value d2 to the scope of higher limit 255 is corresponding to the output valve (X-d1) that it is reduced behind the fixed number d1.That is to say, curve D 3 has been represented following such corresponding relation: make the brightness value that is present in the scope of lower limit 0 to the 1st threshold value d2 corresponding to lower limit 0, make brightness value in being present in from the 1st threshold value d2 to the scope of higher limit 255 corresponding to deduct the value that obtains behind the fixed number d1 from this brightness value.
In addition, satisfy the relation of d2-d1=0 for curve D 3, the 1 threshold value d2.Also can adopt by such curve D 3 represented map tables and come the conversion brightness data.
According to present embodiment, the pixel in the form and aspect zone of user's appointment is reduced brightness value, therefore can when printing black and white image, print specific form and aspect darker, this position is emphasized.
Specifically, can be to having the privileged sites of being write on the original copy of inserting frame, template etc. such as literal to be emphasized to print with the black printing with red.Particularly can deepen to be emphasized, and print desalinating with other positions of black printing with the red privileged sites of being write such as literal.
Execution mode 3
In execution mode 2, the example that the pixel in the form and aspect zone of user's appointment is reduced the situation of brightness value has been described.And the following such situation of explanation in the present embodiment: the pixel to the form and aspect zone that belongs to user's appointment reduces brightness value, and the pixel that does not belong to this form and aspect zone is increased brightness value.
In the image processing apparatus of present embodiment, to belonging to pixel, according to map table change brightness value by the specified form and aspect zone of form and aspect appointed information.Promptly, this pixel is reduced the processing of brightness value.On the other hand, to not belonging to pixel, increase the processing of brightness value by the specified form and aspect zone of form and aspect appointed information.
According to such structure, the pixel in the form and aspect zone of user's appointment is reduced brightness value, and other pixels are increased brightness value, can emphasize further when printing black and white image that therefore specific form and aspect position prints.
Though described the present invention with reference to preferred implementation, but can improve the present invention with several different methods, and can know the numerous embodiments different with the execution mode of top proposition and description by inference, this is conspicuous for those skilled in the art.Therefore, appended claims be intended to contain of the present invention all fall into improvement project in purport of the present invention and the scope.
Claims (20)
1. image processing apparatus, the coloured image that brightness data and the chroma data by each pixel that reads from original copy constituted carries out image processing, and the output black and white image comprises:
The form and aspect specifying part according to user's operation, generates the form and aspect appointed information, and this form and aspect appointed information is specified the form and aspect as transforming object;
Pixel extraction portion is according to the form and aspect that obtain from described chroma data, from the pixel of described coloured image extraction by the form and aspect of described form and aspect appointed information appointment; And
The brightness data transformation component, the described brightness data of the pixel extracted by described pixel extraction portion is made the conversion process that the brightness value that is higher than the 1st threshold value is saturated, the brightness value that is lower than described the 1st threshold value is increased, generate described black and white image from described coloured image.
2. image processing apparatus as claimed in claim 1 is characterized in that, described brightness data transformation component makes brightness value in the scope from lower limit to described the 1st threshold value corresponding to this brightness value being multiply by the value that obtains behind the fixed number.
3. image processing apparatus as claimed in claim 1, it is characterized in that, described brightness data transformation component, make the brightness value that is higher than described the 1st threshold value saturated, make to be higher than the brightness value increase that is lower than described the 1st threshold value than the 2nd little threshold value of described the 1st threshold value, make the brightness value that is lower than described the 2nd threshold value corresponding to same brightness.
4. image processing apparatus as claimed in claim 1, it is characterized in that, described pixel extraction portion, according to the form and aspect that obtain from described chroma data when coloured image extracts pixel, extract the pixel of chroma, and do not extract the pixel of chroma less than described the 3rd threshold value greater than the 3rd threshold value.
5. image processing apparatus as claimed in claim 1, it is characterized in that, have 2 value handling parts, this 2 value handling part will be compared by brightness value and the 4th threshold value that described brightness data transformation component has carried out the brightness data after the conversion process, generates 2 Value Datas according to its comparative result;
The described black and white image that output is made of described 2 Value Datas of each pixel.
6. image processing apparatus as claimed in claim 5, it is characterized in that, has luminance compensation portion, this luminance compensation portion is to having carried out the brightness data after the conversion process by described brightness data transformation component, carry out following processing: the brightness value that will be present in the 1st scope that comprises lower limit is transformed to described lower limit, perhaps, the brightness value that will be present in the 2nd scope that comprises higher limit is transformed to described higher limit
Described 2 value handling parts generate described 2 Value Datas according to having carried out the brightness data after the conversion process by described luminance compensation portion.
7. image processing apparatus as claimed in claim 1, it is characterized in that, has the neighboring area specifying part, this neighboring area specifying part is according to described form and aspect appointed information, generate the neighboring area appointed information, this neighboring area appointed information is specified by the neighboring area in the color space of the form and aspect of described form and aspect appointed information appointment;
Described brightness data transformation component, to pixel,, reduce to make the mode of the ratio that its brightness value increases to compare with described conversion process by the neighboring area of described neighboring area appointed information appointment, come the conversion brightness data, generate described black and white image from described coloured image.
8. image processing method, the coloured image that brightness data and the chroma data by each pixel that reads from original copy constituted carries out image processing, and the output black and white image comprises:
The form and aspect given step according to user's operation, generates the form and aspect appointed information, and this form and aspect appointed information is specified the form and aspect as transforming object;
The pixel extraction step is according to the form and aspect that obtain from described chroma data, from the pixel of described coloured image extraction by the specified form and aspect of described form and aspect appointed information; And
The brightness data shift step, the described brightness data of the pixel extracted by described pixel extraction step is made the conversion process that the brightness value that is higher than the 1st threshold value is saturated, the brightness value that is lower than described the 1st threshold value is increased, generate described black and white image from described coloured image.
9. image processing method as claimed in claim 8 is characterized in that, when extracting pixel by described pixel extraction step, extracts the pixel of chroma greater than threshold value, and does not extract the pixel of chroma less than described threshold value.
10. image processing method as claimed in claim 8, it is characterized in that, has the neighboring area given step, in this neighboring area given step, according to described form and aspect appointed information, generate the neighboring area appointed information, this neighboring area appointed information is specified by the neighboring area in the color space of the form and aspect of described form and aspect appointed information appointment
In described brightness data shift step, to pixel,, reduce the mode of the ratio of its brightness value increase to compare with described conversion process by the specified neighboring area of described neighboring area appointed information, come the conversion brightness data, generate described black and white image from described coloured image.
11. an image processing apparatus, the coloured image that brightness data and the chroma data by each pixel that reads from original copy constituted carries out image processing, and the output black and white image comprises:
The form and aspect specifying part according to user's operation, generates the form and aspect appointed information, and this form and aspect appointed information is specified the form and aspect as transforming object;
Pixel extraction portion is according to the form and aspect that obtain from described chroma data, from the pixel of described coloured image extraction by the specified form and aspect of described form and aspect appointed information; And
The brightness data transformation component, described brightness data to the pixel extracted by described pixel extraction portion, the higher limit of brightness is reduced and use monotonically increasing function in comprising the prescribed limit of higher limit and brightness value is carried out the processing of conversion, generate described black and white image from described coloured image.
12. image processing apparatus as claimed in claim 11 is characterized in that, described brightness data transformation component makes brightness value corresponding to this brightness value being multiply by the value that obtains behind the fixed number.
13. image processing apparatus as claimed in claim 11, it is characterized in that, described brightness data transformation component makes the brightness value that is present in the scope of lower limit to the 1 threshold value corresponding to lower limit, makes brightness value in being present in from described the 1st threshold value to the scope of higher limit corresponding to deduct the value that obtains behind the fixed number from this brightness value.
14. image processing apparatus as claimed in claim 11, it is characterized in that, described pixel extraction portion, is extracting the pixel of chroma greater than the 2nd threshold value, and is not extracting the pixel of chroma less than described the 2nd threshold value when coloured image extracts pixel according to the form and aspect that obtain from described chroma data.
15. image processing apparatus as claimed in claim 11, it is characterized in that having 2 value handling parts, this 2 value handling part will be compared by brightness value and the 3rd threshold value that described brightness data transformation component has carried out the brightness data after the conversion process, generate 2 Value Datas according to its comparative result
The described black and white image that output is made of described 2 Value Datas of each pixel.
16. image processing apparatus as claimed in claim 15, it is characterized in that, has luminance compensation portion, this luminance compensation portion carries out following processing to having carried out the brightness data after the conversion process by described brightness data transformation component: the brightness value that will be present in the 1st scope that comprises lower limit is transformed to described lower limit, perhaps, the brightness value that will be present in the 2nd scope that comprises higher limit is transformed to described higher limit
Described 2 value handling parts generate described 2 Value Datas according to having carried out the brightness data after the conversion process by described luminance compensation portion.
17. image processing apparatus as claimed in claim 11 is characterized in that, for the form and aspect pixel in addition by the appointment of described form and aspect appointed information, described brightness data transformation component increases its brightness value.
18. image processing apparatus as claimed in claim 11, it is characterized in that, also has the neighboring area specifying part, this neighboring area specifying part is according to described form and aspect appointed information, generate the neighboring area appointed information, this neighboring area appointed information is specified by the neighboring area in the color space of the form and aspect of described form and aspect appointed information appointment
Described brightness data transformation component, to pixel,, reduce to make the mode of the ratio that its brightness value increases to compare with described conversion process by the specified neighboring area of described neighboring area appointed information, come the conversion brightness data, generate described black and white image from described coloured image.
19. an image processing method, the coloured image that brightness data and the chroma data by each pixel that reads from original copy constituted carries out image processing, and the output black and white image comprises:
The form and aspect given step according to user's operation, generates the form and aspect appointed information, and this form and aspect appointed information is specified the form and aspect as transforming object;
The pixel extraction step is according to the form and aspect that obtain from described chroma data, from the pixel of described coloured image extraction by the form and aspect of described form and aspect appointed information appointment; And
The brightness data shift step, described brightness data to the pixel extracted by described pixel extraction step, the higher limit of brightness is reduced and use monotonically increasing function in comprising the prescribed limit of higher limit and brightness value is carried out the processing of conversion, generate described black and white image from described coloured image.
20. image processing method as claimed in claim 19 is characterized in that, when extracting pixel by described pixel extraction step, extracts the pixel of chroma greater than threshold value, and does not extract the pixel of chroma less than described threshold value.
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| CN101834968A (en) * | 2009-03-10 | 2010-09-15 | 佳能株式会社 | Image processing equipment and image processing method |
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