CN1756311A - Image switching method and its apparatus - Google Patents
Image switching method and its apparatus Download PDFInfo
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- CN1756311A CN1756311A CN 200410051732 CN200410051732A CN1756311A CN 1756311 A CN1756311 A CN 1756311A CN 200410051732 CN200410051732 CN 200410051732 CN 200410051732 A CN200410051732 A CN 200410051732A CN 1756311 A CN1756311 A CN 1756311A
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Abstract
The invention relates to image conversion method to display more clearly and showily. Wherein, it can merge screen to the shot image from camera and layer image with same image; before the merge, it has completed at one of the operations: contrast enhance, saturation enhance and smoothing. Besides, this invention can also use star-picture effect to characterize people image for different background.
Description
[technical field]
The present invention is the technology of relevant image processing apparatus, especially carries out screen about the image to picked-up and merges processing, and the technology of the image conversion method and the device thereof of a more clear image quality and magnificent effect is provided.
[background technology]
At present, support high resolution image, and the digital camera that can carry out multiple picture editting is able to extensively popularize.In view of the above, recently video camera is installed on the mobile communication terminals such as extraordinary mobile phone of travelling performance or PDA, appears on the market one after another with the product that plays the digital camera effect.
Usually, special-purpose digital camera can provide high resolution image, and the image of the main picked-up of conversion on computers, to obtain the image of the required clear image quality of user.
On the contrary, utilize the image of the video camera picked-up on the terminating machines such as being installed in mobile phone,, be difficult for the picked-up high resolution image, and do not develop the product that can absorb high-definition image so far as yet because of the characteristic issues of camera lens.
Especially in the image that is installed in the video camera picked-up on the mobile phone, usually have dense noise, and can not achieve one's goal and expose and white compensation.In addition, compare with actual illumination, the image of taking with mobile phone camera is darker relatively, and unnecessary colors such as ruddiness or blue light are contained in regular meeting in image.
In order to improve the camera function be installed on the mobile phone, the above-mentioned image quality problem that needs to be resolved hurrily, but in view of the actual cost problem of present hardware aspect, be difficult to set about easily being improved, so should find solution from the software aspect.
In with the most of image that is installed in the video camera picked-up on the mobile phone, often be the center, and background often is a setoff with personage.That is owing to be main photographic images mainly with the personage with the video camera that is installed on the mobile phone, so in the image often based on the personage, background is auxilliary.
For the video camera on being installed in mobile phone, the key of image quality depends on the definition and the magnificent degree of character image.
Because primary mental ability (resource) function that disposes on the mobile phone is limited at present, so be difficult to the required algorithm of image transitions that normal operation needs a lot of checking computations processes.
In addition, in the very crucial device of camera functions such as digital camera, the algorithm that image transitions is required is designed to be installed in device inside behind the chipset (chip set), but because on the mobile phone that video camera is installed, video camera is not to belong to major function, therefore can not drop into enormous expenditure, after the algorithm that image transitions is required is designed to chipset, it is installed in the device.
[summary of the invention]
The present invention is intended to solve existing the problems referred to above in the routine techniques, provides one can carry out screen by the image to picked-up and merge to handle, and obtains the image conversion method and the device thereof of image quality and magnificent effect more clearly.
To achieve these goals, the correct embodiment of the image conversion method of developing according to the present invention is made up of following two several steps: promptly, generate the step with pickup image phase diagram tomographic image; Above-mentioned pickup image and figure tomographic image are carried out the step that screen merges processing.
Above-mentioned screen merges the step of handling also can be divided into following three steps: promptly, and the step that the difference of the difference of maximum brightness value and pickup image brightness value and maximum brightness value and figure tomographic image brightness value is multiplied each other; With the above-mentioned brightness value that draws of multiplying each other divided by maximum, with normalized step; Deduct above-mentioned regular brightness value with maximum brightness value, to obtain the step of difference.
In image conversion method of the present invention, also should comprise at least the figure tomographic image is carried out enhancing contrast ratio, improves the step of the operation more than in saturation or the filtering.
In another correct embodiment of the present invention, image conversion method is made up of following two steps: promptly, pickup image and the figure tomographic image identical with this image are given the step that screen merges processing; Image and pickup image that screen is merged synthesize the step of handling.
In the step of above-mentioned synthetic processing, can utilize from having the star according to the face field of extracting the image of effect.At this moment, the said extracted field should be the face field of above-mentioned pickup image or the face field of screen combined diagram picture.
Image conversion apparatus among two correct embodiment of the present invention is made up of following structure: promptly, preserve the 1st conserving appliance by the video camera photographic images; Preserve the 2nd conserving appliance with pickup image phase diagram tomographic image; Above-mentioned pickup image and figure tomographic image are carried out the required instrument of screen merging.
In above-mentioned image conversion apparatus, at least also can comprise an above instrument in following three kinds of instruments: the instrument of the instrument of enhancing figure tomographic image contrast, raising figure tomographic image saturation, above-mentioned figure tomographic image carried out the instrument of Filtering Processing.
In addition, in above-mentioned image conversion apparatus, also can comprise screen combined diagram picture and above-mentioned pickup image are synthesized the instrument of handling.At this moment, this synthetics can utilize the face field that the star is shone effect that has of extracting from screen combined diagram picture or above-mentioned pickup image.
Above-mentioned video camera can be installed in mobile communication terminal, digital camera or the PC any one the device on.
Below with reference to accompanying drawings correct embodiment of the present invention is elaborated.
In the present invention, more clear and magnificent for making image, should carry out image transitions by the mode of mathematical expression 1.
[mathematical expression 1]
Out(x，y)＝{MAX-[(MAX-In_1(x，y))×(MAX-In_2(x，y))÷MAX}
At this, In_1 (x, y) representative is at the x of input picture 1 and pixel (pixel) brightness value in the y coordinate, In_2 (x, y) pixel brightness value in the x of representing input images 2 and the y coordinate, the maximum brightness value that the MAX represent pixel is had, (x y) represents the pixel brightness value of image on x and y coordinate that is converted to Out.
In the present invention, with two images as above the process naming changed like that of mathematical expression 1 be that screen merges (screen merge).
When merging the mode converted image by screen, two images of He Binging are identical if desired, the bright more image of pixel so, and its result will be bright more, and the darker image of pixel then has the character of keeping original luminance.
In above-mentioned mathematical expression 1,, so only (for example, Y) carry out image and merge processing, and other composition (for example, color component (Cb, Cr)) then will be kept the pixel value of original image the brightness composition if brightness compositions such as YcbCr have been distinguished.
Utilize the image and identical with it image of input, when carrying out screen merging processing by mathematical expression 1, the image after the process screen merges seems more magnificent than the image of input.
Mathematical expression 1 is meant that an input picture and identical with it image are carried out screen merges processing, in the mode of converted image.
At this moment, also can directly identical image and input picture not carried out screen merging processing, but the operation of earlier identical image being carried out enhancing contrast ratio (contrast enhance) or improving saturation (saturation enhance) is carried out it and input picture screen then and is merged processing.
As mentioned above, after formerly above-mentioned identical image being carried out enhancing contrast ratio (contrast enhance) or improved the operation of saturation (saturation enhance), with it and input
Image carries out screen and merges when handling.For convenience of description, below above-mentioned identical image is called the figure tomographic image.
If after the figure tomographic image identical with original image being carried out enhancing contrast ratio (contrast enhance) or improving saturation (saturation enhance) processing, it and above-mentioned input picture are carried out screen merge to handle, the image that merges after handling of screen seems more clear and magnificent than image before this so.
Usually, the method for enhancing contrast ratio has a variety of.But in Fig. 1, the present invention only uses simple conversion regime enhancing contrast ratio, greatly reduces complexity (complexity).That is, as shown in Figure 1, the purpose that improves saturation is to strengthen the image comparison effect, to obtain more strikingly color effect.At this, make the big image of brightness value become bigger, and the image transitions Cheng Gengxiao that brightness value is little.
Improving saturation is the conversion method that makes color of image become denseer and distinct.As shown in Figure 2, in the image that uses the YcbCr color space, suppose that 128.128 on colourity (hereinafter to be referred as the CbCr) plane is central point, so can be from this central point, along the direction of current C bCr position, be farther with the distance setting of central point.That is, on the CbCr plane, central point is a grey, and terminal field is a pure color series, if therefore enlarge the distance of central point, just can improve image saturation.
In the present invention, by following mathematical expression 2, the Cb and the Cr value that have scope between 0～255 are changed.That is,, enlarged distance with certain proportion (for example, 30%) only to the Cb and the Cr of central point with interior distance.Therefore shown in mathematical expression 2, can pass through checking computations in a small amount, just can obtain to improve the effect of saturation.
[mathematical expression 2]
IF(((Cb-127)＜＝84.AND.(Cb-172)＞-84).AND.((Cr-127)＜＝84.AND.(Cr-127)＞-84)))
{IF((Cb-127)＞＝0)
Cb_new＝(Cb-127)*13/10+127
ELSE
Cb_new＝(Cb-127)*13/10+127
IF((Cr-127)＞＝0)
Cr_new＝(Cr-127)*13/10+127
ELSE
Cr_new＝(Cr-127)*13/10+127}
In addition, in above-mentioned image conversion method, except enhancing contrast ratio (contrast enhance) or raising saturation (saturation enhance), also can append filtering
(smoothing) method of operation.At this, filter processing method can adopt average filter (mean filter).Filtering Processing can play fuzzy (blur) effect, and according to the neighboring pixel value, is the center with the current pixel, changes to new pixel value.
If with the current pixel is the center, the mean value of 9 pixels of neighboring pixel is set at current center pixel value, integral image will seem dim so, this also is called as average filter (mean filter) effect aspect image processing.
At this moment, in enhancing contrast ratio (contrast enhance), improve in saturation (saturation enhance) or filtering (smoothing) processing method, can only select one of them as required for use or all select for use.
As mentioned above, image conversion method of developing according to the present invention and device carry out screen by the image to the video camera picked-up and merge processing, can convert thereof into more clear and magnificent image.
By the present invention, also can synthesize processing to character image, to satisfy each user's difference hobby at the image of video camera picked-up with star's photograph effect.
In addition, the checking computations process of above-mentioned image conversion method is very simple, so applicable on the limited mobile communication terminals such as mobile phone of digital camera and even intelligent function, further improved customer-oriented service quality, has effectively promoted client's product purchase to desire.
[description of drawings]
Fig. 1 is in the present invention, is applicable to the chart of enhancing contrast ratio;
Fig. 2 is in the present invention, improves the process schematic diagram of saturation;
Fig. 3 is in correct embodiment of the present invention, the structural representation of image conversion apparatus;
Fig. 4 is in correct embodiment of the present invention, the image conversion method precedence diagram;
Fig. 5 is in another correct embodiment of the present invention, the structural representation of image conversion apparatus;
Fig. 6 is in another correct embodiment of the present invention, the image conversion method precedence diagram;
Fig. 7 is in Fig. 6, extracts the method precedence diagram in face field.
[embodiment]
To further describe the image conversion method among the present invention below.
Fig. 3 is in correct embodiment of the present invention, the structural representation of image conversion apparatus.
As described in Figure 3, image conversion apparatus 10 is made up of following structure: promptly, preserve the frame buffer 13 of video camera 11 pickup images; Preserve figure layer frame buffer 15 with pickup image phase diagram tomographic image; Above-mentioned pickup image and figure tomographic image are carried out the required screen merging engine 17 of screen merging.
In addition, in above-mentioned image conversion apparatus 10, also comprise the figure tomographic image is carried out enhancing contrast ratio, improves saturation or the required instrument 20 of Filtering Processing.
That is to say, in above-mentioned instrument 20, also comprise, strengthen the enhancing contrast ratio engine 23 of picture contrast, the filtering engine 27 that improves the raising saturation engine 25 of saturation and carry out the image filtering processing.
Above-mentioned each engine 23,25,27 can all be included in the image conversion apparatus 10, also can only comprise an engine in the above-mentioned engine 23,25,27 as required.
Frame buffer 13 is the spaces of preserving video camera 11 photographic images, and figure layer frame buffer 15 is spaces of the figure tomographic image of preservation and above-mentioned pickup image identical copy.
Screen merges engine 17 can carry out screen merging processing to the figure tomographic image that is kept at the pickup image in the frame buffer 13 and be kept in the figure layer frame buffer 15.
Screen merging engine 17 can carry out the checking computations process as mathematical expression 1, and it carries out brighter processing to the bright more image of brightness value, and to the darker image of brightness value, then makes it keep current brightness value.
In addition, be included in enhancing contrast ratio engine 23, raising saturation engine 25 and filtering engine 27 in the above-mentioned instrument 20, can be as required, at the figure tomographic image that is kept in the figure layer frame buffer 15, carry out enhancing contrast ratio respectively, improve saturation or Filtering Processing, and then be saved in the figure layer frame buffer 15.
At this moment, screen merges can be in enhancing contrast ratio engine 23, raising saturation engine 25 or filtering engine 27, and figure tomographic image and the above-mentioned pickup image of being handled by plural engine handled at least.
In view of the above, the image transitions that video camera 11 is taken can be become more clear and magnificent image.
To the running of image conversion apparatus with said structure characteristics be elaborated below.
Fig. 4 is in correct embodiment of the present invention, the image conversion method precedence diagram.
As shown in Figure 4, at first, duplicate this pickup image then, to generate identical figure tomographic image (step S32) by video camera 11 pickup images (step S31).At this moment, the image of above-mentioned picked-up and figure tomographic image will be saved in respectively in frame buffer 13 and the figure layer frame buffer 15.
In addition, at the figure tomographic image, will carry out enhancing contrast ratio successively, improve saturation and Filtering Processing (step S33, step S34, step S35).At this moment, above-mentioned steps S33, step S34 and step S35 be the change order arbitrarily, and as required, also can not carry out above-mentioned all processes successively.That is, the operation of enhancing contrast ratio can be only carried out, also enhancing contrast ratio and Filtering Processing can be carried out.In addition, can only carry out Filtering Processing, also can carry out above-mentioned 3 processes successively in the present invention.
If carry out step S33～step S35 successively, so will be to carrying out screen merging processing (step S36) through image after the above-mentioned processing and the above-mentioned pickup image that is saved in the frame buffer 13.
If do not need to carry out all processes of step S33～step S35, just only the figure tomographic image that is kept at the above-mentioned pickup image in the frame buffer 13 and be kept in the figure layer frame buffer 15 is carried out screen merging processing.
In view of the above, can pass through above-mentioned image conversion method, make general image become more clear and magnificent.
Above-mentioned explanation is the magnificent technique of expression to integral image.
But wish that sometimes the background in the image keeps intact, and only wish that face seems clear and magnificent.
Below, will image conversion apparatus and the method thereof that satisfy the demand be elaborated.
Fig. 5 is in another correct embodiment of the present invention, the structural representation of image conversion apparatus.
As shown in Figure 5, image conversion apparatus 40 is merged engine 46, instrument 50 and hybrid-engine 47 and is formed by video camera 42, frame buffer 43, figure layer frame buffer 44, face extraction engine 45, screen.Above-mentioned video camera 42, frame buffer 43, a figure layer frame buffer 44, that screen merges engine 46 is identical with the explanation among above-mentioned Fig. 3 with the function that instrument 50 is possessed, so do not further specify at this.In addition, also comprise enhancing contrast ratio engine 51, raising saturation engine 53 or filtering engine 55 in the above-mentioned instrument 50.
According to having the different images of star according to effect, that is, merge in the image of handling at pickup image or by screen, according to different use images, 45 positions of above-mentioned face extraction engine also can be different separately.
As shown in Figure 5, as having the image of star according to effect, when stating pickup image in the use, face extraction engine 45 will link to each other with frame buffer 43.
On the contrary, as having the image of star according to effect, when using screen to merge the image of handling, face extraction engine 45 will merge engine 46 with screen and link to each other.
That is to say that according to everyone difference hobby, some user likes in face image, uses the face field of extracting from above-mentioned picked-up original image, also some user likes using the face field of extracting from the image that the screen merging is handled.Therefore, as having the image of star, can use the image of above-mentioned picked-up or the image that is merged by screen according to effect.
As shown in Figure 5, hybrid-engine 47 can synthesize processing to face field of being extracted by face extraction engine 45 and the image that is merged by screen merging engine 46 screens.At this moment, as having the image of star according to effect, can use the face field of extracting from above-mentioned pickup image, background can be used by screen and merge the image of handling.
In addition, when the image that merges processing from screen, extracting the face field, as having the star according to effect? image, can use the face field of from the image that screen merge to be handled, extracting, and background can be used the image of above-mentioned picked-up.
To the image conversion apparatus running in the another embodiment of the present invention with said structure characteristics be elaborated below.
Fig. 6 is in another correct embodiment of the present invention, the image conversion method precedence diagram.
As shown in Figure 6, at first by video camera 42 pickup images (step S51), from the image of picked-up, extract face field (step S52) then.At this moment, the image of above-mentioned picked-up is saved to frame buffer (in 3.
In addition, duplicate the image of above-mentioned picked-up, with the identical with it figure tomographic image (step S53) of generation, and the figure tomographic image that will generate is saved in the figure layer frame buffer 44.
Then, the figure tomographic image that is kept at the pickup image in the frame buffer 43 and be kept in the figure layer frame buffer 44 is carried out screen merging processing (step S53).
In addition, though illustrated, after step S53 process, also can in enhancing contrast ratio, raising saturation or Filtering Processing, append the more than one process of carrying out as required at Fig. 6.
After screen merges the processing procedure end, processing is synthesized in face field of extracting in step S52 and the image of being handled by the screen merging, have the image (step S55) of star with generation according to effect.
In said process, have the situation of star according to the above-mentioned pickup image that image is limited to of effect.
On the contrary, if the image that screen merges after handling has the star according to effect, step S52 process should be after step S54.
That is to say, merge from screen and extract the face field the image of handling, and processing is synthesized in this face field and above-mentioned pickup image.
The method of extracting the face field with reference to Fig. 7 simple declaration in step S52 is, at first imports above-mentioned pickup image (step S61), then at the image of input, confirms the whether problem (step S62) in yellowish pink scope of each pixel value.
The pixel that will belong in the yellowish pink scope is formed similar color-set (step S63), therefrom extracts yellowish pink candidate field (step S64) then.
After this, by the ellipse coupling, whether the yellowish pink candidate field that checking is extracted is oval-shaped problem (step S65), if oval, just whether affirmation exists the fact (step S66) of eye and mouth pattern.
At last, the face field is confirmed, and from above-mentioned pickup image, extracted specific face field (step S67).
Image conversion apparatus among the present invention is applicable on mobile communication terminal (for example, mobile phone or PDA), digital camera or the PC.At this moment, should be provided with video camera on mobile communication terminal, digital camera or the PC.
Claims (16)
1, image conversion method comprises:
Generate and pickup image phase diagram tomographic image;
Above-mentioned pickup image and figure tomographic image are carried out screen merging processing.
2, to the conversion method of pickup image, comprising:
Pickup image and the figure tomographic image identical with this image are given screen merging processing;
Image and pickup image that screen is merged synthesize processing.
3, the conversion method to pickup image as claimed in claim 2 is characterized in that,
When image being synthesized processing, should use from having the star according to the face field of extracting the image of effect.
4, the conversion method to pickup image as claimed in claim 3 is characterized in that,
The face field of extracting should be the face field of above-mentioned pickup image or by the face field of screen combined diagram picture.
5, the conversion method to pickup image as claimed in claim 1 or 2 is characterized in that,
Described screen merges processing should be divided into following three steps:
The difference of maximum brightness value and pickup image brightness value and the difference of maximum brightness value and figure tomographic image brightness value are multiplied each other;
With the above-mentioned brightness value that draws of multiplying each other divided by maximum, with normalization;
Deduct above-mentioned regular brightness value with maximum brightness value, to obtain difference.
6, the conversion method to pickup image as claimed in claim 1 or 2 is characterized in that,
Described screen merges all pixels of above-mentioned pickup image of reply and figure tomographic image to be handled.
7, the conversion method to pickup image as claimed in claim 1 or 2 is characterized in that,
Reply figure tomographic image carries out enhancing contrast ratio, improves an above processing procedure in saturation or the filtering.
8, the conversion method to pickup image as claimed in claim 7 is characterized in that,
Improving saturation should be on the colourity plane, the distance between expanded view tomographic image and the central point.
9, the conversion method to pickup image as claimed in claim 2 is characterized in that,
Should generate the figure tomographic image by duplicating above-mentioned pickup image.
10, camera pickuping image is changed required device, comprising:
Preservation is by the 1st conserving appliance of video camera photographic images;
Preserve the 2nd conserving appliance with pickup image phase diagram tomographic image;
Above-mentioned pickup image and figure tomographic image are carried out the required instrument of screen merging.
11, as claimed in claim 10 camera pickuping image is changed required device, it is characterized in that,
Described image conversion apparatus also should comprise the instrument of enhancing figure tomographic image contrast.
12, as claimed in claim 10 camera pickuping image is changed required device, it is characterized in that,
Described image conversion apparatus also should comprise the instrument of raising figure tomographic image saturation.
13, as claimed in claim 10 camera pickuping image is changed required device, it is characterized in that,
Described image conversion apparatus also should comprise the instrument that the figure tomographic image is carried out Filtering Processing.
14, as claimed in claim 13 camera pickuping image is changed required device, it is characterized in that,
Described filtering instrument should be an average filter.
15, as claimed in claim 10 camera pickuping image is changed required device, it is characterized in that,
Described image conversion apparatus also should comprise screen combined diagram picture and above-mentioned pickup image are synthesized the instrument of handling.
16, as claimed in claim 15 camera pickuping image is changed required device, it is characterized in that,
Described synthetics should utilize the face field that the star is shone effect that has of extracting from screen combined diagram picture or above-mentioned pickup image.
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| CNB200410051732XA CN100515044C (en) | 2004-09-29 | 2004-09-29 | Image switching method and its apparatus |
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| CNB200410051732XA CN100515044C (en) | 2004-09-29 | 2004-09-29 | Image switching method and its apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123687B (en) * | 2006-08-11 | 2010-06-09 | 奥林巴斯映像株式会社 | Image taking apparatus and control method therefor |
| CN101404082B (en) * | 2008-11-14 | 2011-02-02 | 深圳市迅雷网络技术有限公司 | Portrait buffing method and apparatus |
| CN104346609A (en) * | 2013-08-01 | 2015-02-11 | 阿里巴巴集团控股有限公司 | Method and device for recognizing characters on printed products |
-
2004
- 2004-09-29 CN CNB200410051732XA patent/CN100515044C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123687B (en) * | 2006-08-11 | 2010-06-09 | 奥林巴斯映像株式会社 | Image taking apparatus and control method therefor |
| CN101404082B (en) * | 2008-11-14 | 2011-02-02 | 深圳市迅雷网络技术有限公司 | Portrait buffing method and apparatus |
| CN104346609A (en) * | 2013-08-01 | 2015-02-11 | 阿里巴巴集团控股有限公司 | Method and device for recognizing characters on printed products |
| CN104346609B (en) * | 2013-08-01 | 2018-05-04 | 阿里巴巴集团控股有限公司 | The method and device of character on a kind of identification printed matter |
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| CN100515044C (en) | 2009-07-15 |
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