CN1467991A - Pick-up device and picture pick-up method - Google Patents
Pick-up device and picture pick-up method Download PDFInfo
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- CN1467991A CN1467991A CNA031372295A CN03137229A CN1467991A CN 1467991 A CN1467991 A CN 1467991A CN A031372295 A CNA031372295 A CN A031372295A CN 03137229 A CN03137229 A CN 03137229A CN 1467991 A CN1467991 A CN 1467991A
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Abstract
Provided is an imaging apparatus and an imaging method capable of reducing the increase of a shutter time lag, even when a plurality of times of photographing with different exposure conditions and composite processing are performed, to increase a dynamic range. In the imaging apparatus and the imaging method, batch photographing composed of one or more times of photographing is carried out to synthesize one image from a plurality of images according to different exposure conditions. Preliminary photographing is carried out once to obtain AE exposure information, and the luminance value of an object is measured based on an image acquired by the preliminary photographing. The number of times of photographing in the batch photographing and exposure conditions upon the batch photographing is set based on the luminance value.
Description
Technical field
The present invention relates to a kind ofly possess picture signal from the different a plurality of picture part of imaging apparatus output exposure, by synthesize the composograph of the function of handling the acquisition wide dynamic range.
Background technology
Usually, in the Electrofax that adopts the CCD imaging apparatus, carry out under the situation of AE exposure photography (preparation photography) line item of going forward side by side, with A/D converter the photographed images conversion of signals is become DID, but when the conversion figure place of A/D converter was 10 bits, the output valve of view data was in 0～1023 scope.The data 32 below of dark side for example in the view data in this scope have reduced the reliability of image data value owing to the influence of noise.And, because the data division of bright side is saturated, so can use to about 960 data.Thereby the brightness that can discern in operable 32～960 data area is 30 times of 960/32 , when with Bv (briliancy) value representation, is approximately 5 grades.
On the other hand, because the exposure possible range of Electrofax is generally 16 sections of Bv (3)～Bv (13), so in 1 AE exposure, can be known by the relation of the common conversion figure place (10 bit) of A/D converter can not be corresponding with whole brightness.Therefore, in order to realize AE exposure, when making the corresponding scope of 1 exposure overlapping, as shown in Figure 8, be necessary to carry out about 4 times AE with exposure A, B, C, D corresponding to whole brightness of camera exposure possible range.
Usually, utilize the electronic shutter of CCD imaging apparatus and the gain in CDS loop that the above-mentioned conditions of exposure that respectively exposes A, B, C, D is adjusted.In table 1, expressed the example of conditions of exposure of median (11,7,3 ,-1) of each Bv of exposure A, B corresponding to Fig. 8, C, D.At this, Av is that f-number, Tv are that shutter speed, Sv represent sensitivity.In addition, be that known program line chart from Figure 10 calculates corresponding to Av, Tv, the Sv of Bv value.
[table 1]
| ????Av | ????Tv | ????Sv | ????Bv | |
| Exposure A | ????3 | ????13 | ????5 | ????11 |
| Exposure B | ????3 | ????9 | ????5 | ????7 |
| Exposure C | ????3 | ????5 | ????5 | ????3 |
| Exposure D | ????3 | ????5 | ????9 | ????-1 |
As mentioned above, calculate the AE conditions of exposure of main photography from the view data of utilizing four AE to obtain with exposure, below, these computational methods are described.At first, as shown in Figure 9, the specific region of cutting apart the edge part zone in the photography angle of visual field of removing the photographs that each preparation photography of utilizing four times obtained with 9 * 9 piecemeal calculates the mean value of the rgb signal of each block, calculates briliancy Y ' by this mean value according to following formula (1).
Y’＝0.299R+0.587G+0.114B··········(1)
Weight coefficient (1 or 2) shown in multiply by this briliancy Y ' in each block of Fig. 9 calculates weighted average.And, utilize each picture signal that obtains by each exposure A, B, C, D to carry out the computing of this weighted average Y, weighted average Y selects the AE exposure (preparation photography) in 32～960 the scope of entering from four exposures A, B, C, D.For example, select exposure C, then Y=500.Being drawn by following formula (2) at this moment by the Bv value of photo-object.
Bv=3 (the target Bv value of exposure C)+log2[500/200 (AE desired value)]=4.3
···········(2)
The meaning of content that should (2) formula is, when during to being photographed by photo-object of Bv (3) brightness, determining that Y is 200 with exposure C, determines amount of movement from Bv (3) from the ratio of the briliancy weighted average Y and 200 (AE desired value) that calculates.
By by the top described Bv value of obtaining, adopt program line chart shown in Figure 10 to obtain Tv, Av value.For example, obtain the Bv value and be the intersection point P of the sensitivity line that 4.3 vertical line and Sv value be 4 (ISO:50), obtain by the oblique line of this intersection point P and the intersection point Q of program line chart, f-number Av among this intersection point Q and shutter speed Tv become the conditions of exposure in the main photography.
On the other hand, usually, in camera heads such as television camera, television camera, digital camera, adopt solid-state imagers such as CCD imaging apparatus, but have the dynamic range problem that many narrower of solid-state imager than the silver halide photography egative film.
Past, in order to address this problem, proposed to read the picture signal of two different picture part of exposure from single imaging apparatus, the scheme of the image by the synthetic dynamic range that obtains to have amplification, for example, open the spy and to have proposed following structure in the 2000-92378 communique, generated exposure difference to same by photo-object for having, it is the picture signal of a plurality of picture part of short time exposure and time exposure, synthesize the camera head of the function of the composograph of handling and generate wide dynamic range, can be from common photograph mode, select a photograph mode to photograph at least two photograph modes in the photograph mode of the photograph mode of compulsory wide dynamic range and automatic wide dynamic range.
In common single exposure photography,, when carrying out the photometry processing of being undertaken by 4 preparation photoexposures,, produce suitable fast gate delay from pressing shutter to carrying out spending official hour till this exposure in order to obtain suitable conditions of exposure.And, during having the image pickup signal of reading the different a plurality of picture part of exposure from single imaging apparatus, the camera head of function of image by synthesizing the dynamic range that obtains to have amplification, correct exposure condition when obtaining the multiexposure, multiple exposure of different exposure, perhaps in order to set exposure frequency, when the exposure-processed of carrying out carrying out in the mode of single exposure photography respectively, produce same fast gate delay ( イ system ラ グ) by four preparation photoexposures.
The content of invention
For solve the problems referred to above of the camera head had the complex functionality of repeatedly photographing that dynamic range amplifies in the past, the purpose of this invention is to provide a kind of camera head and image capture method, when carrying out the repeatedly shooting of amplifying, can reduce fast gate delay than commonness photograph for dynamic range.
In order to address the above problem, in described invention 1, for the camera head of photographing in batch that synthesizes an image from a plurality of images that form by different exposure, carries out constituting by the photography more than 1 or 2 time, it is characterized in that being furnished with: the image mechanism of output photographs, according to photographs measure the brightness value of the body of being taken pictures light-measuring mechanism, set the aforementioned photography number of times set mechanism of the photography number of times of photography in batch according to the aforementioned brightness value that obtains by 1 preparation photography.
In the camera head that constitutes like this, owing to be to constitute in mode according to the photography number of times of being photographed in batch that utilizes 1 preparation photography to be obtained by the brightness value of photo-object, setting, even so under the situation of the repeatedly photography of carrying out implementing by different exposure, compared with like that repeatedly prepared photography to the past, can reduce fast gate delay.
According to described invention 2, for from the synthetic image of a plurality of images of forming by different exposure, carry out constituting in the camera head of photography in batch by the photography more than 1 or 2 time, it is characterized in that, be furnished with: the image mechanism of output photographs, measure by the light-measuring mechanism of the brightness value of photo-object according to photographs, with photography number of times set mechanism, described photography number of times set mechanism, under the aforementioned brightness value situation within the limits prescribed that obtains by 1 preparation photography, set the aforementioned photography number of times of photography in batch according to aforementioned brightness value, under the situation beyond the scope of regulation, set the aforementioned photography number of times of photography in batch at the aforementioned brightness value that obtains by 1 preparation photography according to the brightness value that condition is changed and prepare photography once more and obtained.
In the camera head that constitutes like this, only prepare photography where necessary once more owing to once just finish the preparation photography usually, so can shorten fast gate delay usually, simultaneously, can set the suitable photography number of times of photography in batch.
In the camera according to described invention 3, it is characterized in that further being furnished with the exposure condition setting mechanism of each conditions of exposure when photographing in batch according to being set by the brightness value of photo-object of being obtained by aforementioned preparation photography is aforementioned.In the camera head that constitutes like this,, can set each the suitable conditions of exposure when photographing in batch according to by the briliancy of photo-object.
In the camera head according to described invention 4, it is characterized in that aforementioned exposure condition setting mechanism has the benchmark exposure value set mechanism of setting the benchmark exposure value that constitutes the benchmark of setting aforementioned each conditions of exposure.In the camera head that constitutes like this, because each conditions of exposure of having set to set when photographing in batch is the benchmark exposure value of benchmark, so can obtain luminance difference to suitable photography.
In described invention 5 camera heads, it is characterized in that aforementioned benchmark exposure value set mechanism is set the first benchmark exposure value according to aforementioned brightness value, and then setting is changed corresponding to the aforementioned first benchmark exposure value, and set other benchmark exposure value.In the camera head that constitutes like this, owing to be to be set the benchmark exposure value according to what obtain by the preparation photography by the brightness value of photo-object, so can be to set photoexposure condition more accurately by photo-object.
In the camera head according to described invention 6, it is characterized in that, aforementioned light-measuring mechanism, has the piecemeal brightness value calculation mechanism that calculates each regional brightness value that aforementioned photographs is divided into as the piecemeal brightness value, aforementioned photography number of times set mechanism is set aforementioned photography number of times according to aforementioned distribution by the brightness value of photo-object and aforementioned piecemeal brightness value.In the camera head that constitutes like this, since be according to 1 preparation photography obtained by the distribution of the piecemeal brightness value of photo-object, set the photography number of times of photography in batch, so can be by 1 preparation photographing setting corresponding to by the suitable photography number of times of photo-object briliancy.
In the camera head according to described invention 7, it is characterized in that, aforementioned photography number of times set mechanism has the distribution ratio calculation mechanism, and this distribution ratio calculation mechanism calculates the ratio of the piecemeal brightness value of high luminance range in the distribution that belongs to aforementioned piecemeal brightness value respectively or low luminance range.In the camera head that constitutes like this,,, set more suitable photography number of times so can suitably confirm the distributional pattern of piecemeal brightness value owing to calculate the just ratio of the distribution of the piecemeal brightness value of luminance range.
In the camera head according to described invention, it is characterized in that, aforementioned photography number of times set mechanism in the aforementioned high briliancy or low luminance range of ratio more than setting of aforementioned piecemeal brightness value, is set the photography number of times with increase corresponding to the mode of the photography of the conditions of exposure of this scope.In the camera head that constitutes like this, owing to utilize the ratio of the piecemeal brightness value that belongs to high luminance range or low luminance range respectively, increase is corresponding to the photography of the conditions of exposure of its scope, thereby, even utilize 1 preparation photography, can reflect that also the number of times of the more suitable photography in batch of the briliancy of being taken pictures is set.
According to described invention 9, for from the synthetic image of a plurality of images of forming by different briliancy conditions, carry out constituting the camera head of photography in batch by the photography more than 1 or 2 time, it is characterized in that being furnished with: export the image mechanism of photographs, measure the exposure condition setting mechanism that is set aforementioned each conditions of exposure of photographing in batch by the light-measuring mechanism of the brightness value of photo-object, basis by the aforementioned brightness value of 1 preparation photography acquisition according to photographed images.
In the camera head that constitutes like this, since with according to the brightness value that obtains by 1 preparation photography, set in batch that the mode of each conditions of exposure of photography constitutes, even so under the situation of the repeatedly photography of carrying out being undertaken by different exposure, compare with the mode of repeatedly preparing photography, also can reduce fast gate delay according to existing mode.
Invention according to claim 10, in camera head according to claim 9, it is characterized in that, aforementioned exposure condition setting mechanism, the combination of benchmark exposure value of benchmark that form to set aforementioned each conditions of exposure as the exposure value group, is selected an exposure value group according to aforementioned brightness value from a plurality of exposure value groups of preparation.In the camera head that constitutes like this, owing to from the combination of a plurality of exposure value groups of preparation, select an exposure value group as conditions of exposure according to brightness value, so can handle with the time shorter, simultaneously, can not make a mistake than the mode of independent calculation exposure value.
According to described invention, for from the synthetic image of a plurality of images of forming by different conditions of exposures, carry out constituting the image capture method of photography in batch by the photography more than 1 or 2 time, it is characterized in that, carry out 1 preparation photography, according to utilizing aforementioned preparation photography to measure by the brightness value of photo-object, set the aforementioned photography number of times of photography in batch according to aforementioned brightness value from the photographs of image mechanism output.
In the image capture method that constitutes like this, for from the synthetic image of a plurality of images of forming by different conditions of exposures, carry out constituting the image capture method of photography in batch by the photography more than 1 or 2 time, set the photography number of times of photography in batch according to the brightness value that obtains by a preparation photography, compare in the mode of setting photography number of times with repeatedly prepare photography according to existing mode, can reduce fast gate delay.
According to described invention, for the image capture method of photographing in batch that synthesizes an image from a plurality of images that form by different conditions of exposures, carries out constituting by the photography more than 1 or 2 time, it is characterized in that, carry out 1 preparation photography, according to utilizing aforementioned preparation photography to measure by the brightness value of photo-object, set the aforementioned conditions of exposure of photography in batch according to aforementioned brightness value from the photographs of image mechanism output.
In the image capture method that constitutes like this, for the image capture method of photographing in batch that synthesizes an image from a plurality of images that form by different conditions of exposures, carries out constituting by the photography more than 1 or 2 time, set each conditions of exposure of photography in batch according to the brightness value that obtains by 1 preparation photography, compare with the mode of repeatedly preparing photography according to existing mode and setting each conditions of exposure, can reduce fast gate delay.
The simple declaration of accompanying drawing
Fig. 1 is the structured flowchart of expression according to the form of implementation of camera head of the present invention.
Fig. 2 is the structured flowchart of the structure example of the camera signal treatment loop in the expression form of implementation shown in Figure 1.
Fig. 3 is the operation that is used to illustrate according to an AE exposure-processed mode of operation of the camera head of form of implementation shown in Figure 1.
Fig. 4 be illustrated in when obtaining AE information by preparation photography, by by the frequency curve of the distribution of cutting apart the briliancy that photometry obtains of photo-object.
Fig. 5 is the flow chart of operation that is used for illustrating the 2nd AE exposure-processed mode of operation of camera head shown in Figure 1.
Fig. 6 is the flow chart of operation that is used for illustrating the 3rd AE exposure-processed mode of operation of camera head shown in Figure 1.
Fig. 7 is the flow chart of operation that is used for illustrating the 4th AE exposure-processed mode of operation of camera head shown in Figure 1.
Fig. 8 is the diagram of the preparation photography state of expression when obtaining AE exposure information corresponding to the possible exposure range of camera.
Fig. 9 is to cut apart the diagram of the state of photometry by photo-object when representing to obtain the AE exposure.
Figure 10 is the program line chart that is used for being determined by the Bv value of utilizing the AE exposure settings photoexposure condition.
The working of an invention form
Below, form of implementation is described.At first, adopt the electric overall structure of the form of implementation of camera head of the present invention according to block diagram illustrations shown in Figure 1.In Fig. 1, the 1st, the light signal opto-electronic conversion is become veneer (monolithic) the colored CCD imaging apparatus of the opto-electronic conversion of the signal of telecommunication, have electronic shutter function, in this CCD imaging apparatus 1, by camera lens 2 and diaphragm shutter mechanism 3, input is by the picture of photo-object.The output of CCD imaging apparatus 1 is amplified by being exaggerated device 4 behind the relevant removal noises such as dual sampling circuit.The 5th, convert output the A/D converter of numerical data to as the amplifier 4 of analogue data, the 6th, with from CCD imaging apparatus 1 and the camera signal treatment loop that the image pickup signal that comes is handled as view data.The 7th, before original photography, adopt from CCD imaging apparatus 1 and the preparation image pickup signal that comes, the AF loop of extracting AF (automatic focus) information that control focuses on, the AE loop of AE (automatic exposure) information that extracts the control exposure and the AWB loop of extracting AWB (automatic white balance) information of setting white balance, from AF, AE, AWB loop 7 and the output signal of coming via CPU8, carry AF information to camera lens 8, carry AE information to diaphragm shutter mechanism 3, carry AWB information to camera signal treatment loop 6.
The 9th, data volume is compressed the compression treatment loop of processing (JPEG), the view data of being handled by these compression circuit 9 compressions is recorded in the storage card 15 via storage card I/F14.The 10th, storage control, the 11st, DRAM, they use with memory as operation when the color treatments of carrying out view data etc.The 12nd, show circuit, the 13rd, the LCD display part, they are read and show the data that for example are stored in the storage card 15, are used for affirmation to photography state etc.The 16th, be used for carrying the data computing machine I/F that is recorded in storage card 15 to computer 17.In addition, in Fig. 1, the 18th, the timing generator of the commutator pulse of generation driven CCD imaging apparatus 1 is according to the controlling and driving CCD imaging apparatus 1 of CPU8.The 19th, flash lamp mechanism utilizes the AE information that obtained by the preparation photography, carries out via CPU8 and carry out/do not carry out luminous control of photoflash lamp and the luminous luminous quantity control of photoflash lamp before original photography.The 20th, the enter key of CPU carries out various photograph modes, photography scene mode or the setting of photography conditions and the driving of various switches etc.
Below, the photographic recording action of the camera head of said structure is described.In this form of implementation, as photograph mode, comprise: the common photograph mode that obtains the image pickup signal of a picture part according to common AE information with 1 photography, repeatedly photographed by photo-object to same with different exposures, generate the picture signal of the different a plurality of picture part of exposure, synthesize and handle the SL photograph mode that obtains wide dynamic range (being designated hereinafter simply as SL:Super Latitude) composograph, when can setting, also can judge from the brightness value of picture being cut apart the photometry gained as hereinafter described with enter key, automatically switch by CPU8, set above-mentioned photograph mode.
Under the situation that is set at the common photograph mode that does not carry out the SL photography, according to common AE information, will convert digital signal to by the image pickup signal that 1 photography obtains by A/D converter 5, utilize camera signal treatment loop 6 to accept the signal processing of regulation, secondly, in compression circuit 9, compress processing, record in the storage card 15.
On the other hand, when being set at the SL photograph mode, the camera signal treatment loop 6 that the information that will obtain from the picture signal of a plurality of picture part of the different exposures of having photographed, the information that obtains from the picture signal of for example three picture part are used for structure shown in Figure 2 carries out the generation of SL composograph and handles.
In Fig. 2, the first memory of the short time exposure image data that the 6-1 short time conditions of exposure (big Bv value) that to be memory by using determine according to the AE information that describes in detail is below photographed, the second memory of the first time exposure view data that the 6-2 first time exposure condition (middle Bv value) that to be memory by using determine according to same AE information is photographed, the 3rd memory of the second time exposure view data that the 6-3 second time exposure condition (little Bv value) that to be memory by using determine according to same AE information is photographed, 6-4 be with the exposure of the short time exposure image and the first time exposure image than A (=LE1/SE) multiply by from the multiplier of the short time exposure image data that first memory 6-1 reads, 6-5 be with the exposure of the first time exposure image and the second time exposure image than B (=LE2/LE1) multiply by the multiplier of the first time exposure view data of reading by second memory 6-2,6-6 is by by the short time exposure image data of multiplication process, the second time exposure view data of reading by the first time exposure view data of multiplication process with from the 3rd memory 6-3 is synthetic and form the synthesis loop of the dynamic range composograph of broad, and 6-7 compresses the compression treatment loop of handling the line output of going forward side by side to the SL composograph that is obtained by synthesis loop 6-6.In addition, when not carrying out the common photograph mode of SL photography, the image data storage of being photographed by single exposure not synthesize processings in the 3rd memory 6-3 for example, only compresses processing and exports.
Below, according to flow chart shown in Figure 3 to describing about handling mode of operation according to first of the AE in the camera head of above-mentioned form of implementation exposure.At first, before original photography, prepare photography, the image pickup signal that employing obtains from CCD imaging apparatus 1, carry out obtaining of AE information, but under this first processing mode of operation, at first hang down the conditions of exposure (Av:3 of a little Bv values than Bv median with selection in the example of conditions of exposure at predefined 4 AE shown in Fig. 8 and the table 1, Tv:5, Sv:5 Bv:3), carries out 1 preparation photography (step S1).
And, at first the same with explanation to prior art, to be divided into 9 * 9 piece by the photographs that the preparation carried out with above-mentioned conditions of exposure C photography obtains, with be weighted by mean value the rgb signal of each spacing block calculate obtain by the weighted average Y of photo-object briliancy, carry out as object by photo-object whether be the selected conditions of exposure C brightness that is correct exposure by photo-object, whether be more measure by photo-object, or more ' dark judged (step S2) by the correct exposure of photo-object.By this judgement, when (32＜Y＜960) in input 32～960 the scope by the weighted average Y of photo-object briliancy the time, be judged as correct exposure, under the situation below 32, be judged as secretlyer, judge to brighter by photo-object in the situation more than 960 by photo-object.
In this determining step S2, be judged as darker by the situation of photo-object under, suppose that the Bv value is 1 ,-2, and carry out twice photography (SL photography) (step S3), be judged as brighter by the situation of photo-object under, suppose that the Bv value is 6,11, and carry out twice photography (SL photography) (step S4).In addition, in this case, when setting Bv value, at first with the example of prior art in illustrate the same, adopt the program line chart of Figure 10 to determine main photoexposure condition respectively, carry out twice master and photograph.
On the other hand, in above-mentioned correct exposure determining step S2, by the weighted average Y of photo-object in 32～960 scope, be judged as under the situation of correct exposure, preparing the frequency curve (ピ ス ト グ ラ system) of the brightness (briliancy distribution) in the AE zone of photographs and resolve (step S5).That is, as shown in Figure 4, each brightness value of the block according to 9 * 9 is made briliancy distribution map (frequency curve).In addition, in Fig. 4, transverse axis is represented brightness (10 bit), and the longitudinal axis is represented frequency (piece number).Secondly, whether the judgement as resolving according to this frequency curve at first belongs to the frequency of brightness in the regional A below 32 at the judgement more than 5 (step S6).
When brightness under the situation of frequency (frequency) less than 5 of the regional A below 32, then carry out brightness at the frequency of the area B more than 960 whether at the judgement more than 5 (step S7).Under the situation of this frequency less than 5, telling this was all seldom objects of bright part, dark excessively part by photo-object, because it is also nonsensical to carry out repeatedly the SL photography, so carry out 1 photography (step S8) of common photograph mode.In this case, Bv value (Bv1) at first utilizes (2) formula to calculate with common computational methods according to weighted average brightness value Y.
In the judgement of above-mentioned steps S7, brightness at the frequency of the scope B more than 960 under the situation more than 5, judge in by photo-object, to have the considerable highlights branch of crossing, carry out 2 photographies (SL photography) (step S9).Bv value in this case, for the same Bv value (Bv1) that usual way calculates and the Bv value (Bv2) that on this Bv value (Bv1), adds 3 grades (Bv1+3) utilized of situation of 1 photography.That is, for example when Bv1 was 3, then Bv2 was 6.
And, in the judgement of above-mentioned steps S6, brightness at the frequency of the regional A below 32 under the situation more than 5, then carry out brightness at the frequency of the area B more than 960 whether at the judgement more than 5 (step S10).Under the situation of this frequency less than 5, be judged as and in by photo-object, have the considerable dark-part of crossing, carry out 2 photographies (SL photography) (step S11).Bv value in this case, for the same Bv value (Bv1) that usual way calculates and the Bv value (Bv2) that deducts 3 grades (Bv1-3) by this Bv value (Bv1) utilized of situation of 1 photography.That is, for example when Bv1 was 3, Bv2 was 0.
In the judgement of above-mentioned steps S10, brightness at the frequency of the area B more than 960 under the situation more than 5, be judged as part bright excessively in by photo-object, dark excessively part is all more, carries out 3 photographies (SL photography) (step S12).Bv value in this case, for equally with the situation of 1 photography utilize Bv value (Bv1) that usual way calculates, on this Bv value (Bv1), add 3 grades (Bv1+3) Bv value (Bv2) and deduct the Bv value (Bv3) of 3 grades (Bv1-3) from this Bv value (Bv1).
According to the Bv value in each when photography of obtaining as mentioned above, adopt the program line chart to set the photoexposure condition professional etiquette of going forward side by side and decide the photography of number of times, under the situation that SL photographs, synthesize processing.
As mentioned above, adopt an AE to handle mode of operation,, set the photoexposure condition with the photography number of times according to the photometry brightness value that obtains by 1 preparation photography, thereby compare with the like that common situation of carrying out 4 preparation photographies of prior art, can reduce fast gate delay.
Secondly, the flow chart according to Fig. 5 describes the 2nd AE exposure-processed mode of operation.Under this AE exposure-processed mode of operation, at first select conditions of exposure C and carry out 1 preparation photography (step S21), obtain by the briliancy weighted average Y of photo-object from the photographs that is obtained equally, carry out conditions of exposure C and whether be correct exposure brightness by photo-object, whether be brighter by photo-object or whether be darker to be judged (step S22) by the correct exposure of photo-object.And, be judged as darker by the situation of photo-object under, suppose that the Bv value is 1 ,-2 and carries out twice photography (SL photography) (step S23), be judged as under the situation of correct exposure, preparing the frequency curve (frequency diagram) of brightness in the AE zone of photographs equally and resolve (step S24).And, according to frequency curve resolve belong to brightness at the frequency of the regional A below 32 whether at the judgement more than 5 (step S25), under the situation of this frequency less than 5, then belong to brightness at the frequency of the area B more than 960 whether at the judgement more than 5 (step S26), under the situation of this frequency less than 5, carry out the once photography (step 27) of photograph mode usually, surpass at 5 o'clock, carry out 2 photographies (SL photography) (step S28) at this frequency.
And, in the judgement of above-mentioned steps S25, brightness at the frequency of the regional A below 32 under the situation more than 5, then carry out brightness at the frequency of the area B more than 960 whether at the judgement more than 5 (step S29), under the situation of this frequency less than 5, carry out 2 photographies (SL photography) (step S30), under the situation more than 5, carry out 3 photographies (SL photography) (step S31) at its frequency.
Though the operation of each step till above step S31 is identical with the mode of operation of an AE exposure-processed, but for this processing mode of operation, in above-mentioned correct exposure determining step S22, be judged as brighter by the situation of photo-object under, different with an AE exposure-processed mode of operation that is set at 2 photographies immediately, it is characterized in that, from conditions of exposure C, select the high adjacent conditions of exposure B (Av:3 of Bv value, Tv:9, Sv:5, Bv:7), carry out the second preparation photography (step S32).
Promptly, for correct exposure determining step S22, be judged as brighter by the situation of photo-object under, carry out the second preparation photography with conditions of exposure B, the weighted average Y of the brightness value of the photographs that obtains according to being photographed by this preparation carries out the correct exposure the same with above-mentioned steps S22 and judges (step S33).And, utilizing this conditions of exposure B to prepare in the photographic process, be judged as brighter by the situation of photo-object under, suppose Bv (8) and Bv (11) and determine the conditions of exposure of 2 photographies, carry out 2 photographies (SL photography) (step S34).
In correct exposure determining step S33, in the preparation photography of conditions of exposure B, be judged as under the situation of correct exposure, with former to state the situation that is judged as correct exposure among the correct exposure determining step S22 that preparation photography that conditions of exposure C carries out carried out the same, move to the luminance frequency curve analyzing step S24 in AE zone, below carry out 1 time～3 times photographies (step S25～step S31) according to the frequency curve analysis result equally.
As mentioned above, in the 2nd AE exposure-processed operation format, corresponding to bright by photo-object, carry out twice preparation photography of conditions of exposure C and conditions of exposure B, even also be not limited to the SL photography carried out with twice photography under by the situation of photo-object bright, under the low situation of contrast, the SL photography can be only just carried out in 1 photography also can carrying out carrying out with common photograph mode where necessary accurately.
Below, according to the state of flowchart text the 3rd AE exposure-processed of Fig. 6 operation.This AE exposure-processed state, omitted the processing operation below the frequency curve analyzing step in the AE exposure-processed mode of operation of representing in the flow chart of Fig. 3, always the brightness value according to the photographs that is obtained by 1 preparation photography carries out 2 photographies (SL photography).
Promptly, as shown in Figure 6, at first select conditions of exposure C to prepare photography (step S41), obtain by the weighted average Y of photo-object briliancy by the photographs of gained, carry out conditions of exposure C and whether be correct exposure brightness by photo-object, whether whether be brighter by photo-object, perhaps be darker to be judged (step S42) by the correct exposure of photo-object.And, judging that exposure C is under the situation of correct exposure, suppose that the Bv value is 1 and 4 and determines the photoexposure condition, carry out 2 photographies (step S43), and, be judged as darker by the situation of photo-object under, suppose that the Bv value is 1 and-2 and determine the photoexposure conditions, carry out 2 photographies (step S44), equally be judged as brighter by the situation of photo-object under, suppose that the Bv value is 6 and 9 and determines the photoexposure condition, carries out 2 photographies (step S45).
Like this, omitted the frequency curve dissection process,, from pre-prepd three Bv value groups, be chosen as the group of setting according to the brightness value that obtains by 1 preparation photography, thereby, needn't calculate the Bv value separately, can handle at short notice.
Secondly, according to flowchart text the 4th AE exposure-processed mode of operation of Fig. 7.Handle under the mode of operation at this, whether at first carry out setting 1 photograph mode and the repeatedly judgement (step S51) of any one photograph mode in the SL photograph mode by enter key, photography photography for the situation of SL photograph mode repeatedly under (step S52), then, utilize 1 preparation photography being undertaken by conditions of exposure C to carry out 1～3 main photography (step S53) by the every processing of the step S1～S12 in the AE exposure-processed mode of operation shown in the flow chart of Fig. 3.
On the other hand, in photography is under the situation of existing 1 photograph mode (step S54), at first photoexposure condition C is also prepared photography (step S55), obtain by the weighted average Y of photo-object briliancy from the photographs of gained, whether be the conditions of exposure C brightness that becomes correct exposure by photo-object or darker by photo-object or brighter judged (step S56) by the correct exposure of photo-object.And, be judged as correct exposure or darker by the situation of photo-object under, utilize conditions of exposure D to prepare photography (step S56) once more, and be judged as brighter by the situation of photo-object under, utilize conditions of exposure A to prepare photography (step S57), then utilize conditions of exposure B to prepare photography (step S58).
And, as mentioned above, obtain weighted average Y from the brightness value of the preparation photographs that obtains by conditions of exposure D or conditions of exposure A and B, serve as the suitable conditions of exposure Bv value of basis photography with it, the conditions of exposure of photographing according to the definite master of this Bv value.
Adopt this to manage mode of operation everywhere, is furnished with the photograph mode determining step, under 1 photograph mode, carry out four preparation photographies equally, the high-precision photography conditions of photographing, and, when SL photograph mode repeatedly, finish with 1 preparation photography, therefore, can not increase fast gate delay ground and carry out high-precision photography.
Effect of the present invention:
As above according to the form of implementation explanation, adopt the invention 1 of basis, since be according to obtained by 1 preparation photography by the brightness value of photo-object, set the photography number of times of in batch photography, even so in the situation of the repeatedly photography of carrying out being undertaken by different exposure, compare with repeatedly preparing photography, can reduce fast gate delay. And, adopt according to described invention 2, usually once finish the preparation photography, only again prepare where necessary photography, thereby usually can shorten fast gate delay, simultaneously, the in batch correct photography number of times of photography of can photographing. And, adopt according to invention 3, corresponding to by the briliancy of photo-object, the correct exposure condition when photographing in batch of can photographing. And, adopt according to invention 4, owing to set the benchmark exposure value of the benchmark of each conditions of exposure when becoming setting and photographing in batch, so can photograph with correct luminance difference. And, adopt according to described invention 5, owing to set the benchmark exposure value according to what obtained by the preparation photography by the brightness value of photo-object, so can be to be set more correct photoexposure condition by photo-object. And, employing is according to described invention 6, according to obtained by 1 preparation photography by the distribution of the piecemeal brightness value of photo-object, photography is the photography number of times of photography in batch, thereby, can be with 1 preparation photographing setting corresponding to by the photography number of times of the briliancy of photo-object.
And, adopt according to described invention 7, owing to calculate the distribution ratio of the piecemeal brightness value of height tonal range, so can correctly confirm the distributional pattern of piecemeal brightness value, can set more correct photography number of times. And, employing is according to invention 8, owing to utilize the ratio of the piecemeal brightness value belong to respectively high luminance range or low luminance range to carry out photography corresponding to the conditions of exposure of this scope, set so namely use 1 preparation photography also can react by the number of times of the in batch photography of the briliancy of photo-object. And, employing is according to described invention 9, owing to be according to the brightness value that is obtained by 1 preparation photography, set in batch each conditions of exposure of photography, even so in the situation of repeatedly photographing with different conditions of exposures, with resembling prior art, repeatedly prepare photography and compare, still can reduce fast gate delay. And, employing is according to described invention 10, according to the brightness value that obtains by 1 preparation photography, owing to be that an exposure value group in will the combination of a plurality of exposure value groups of preparation is selected as conditions of exposure, so can be to process than the independent shorter time of calculating photoexposure value, simultaneously, can worry to produce mistake. And, employing is according to described invention 11, for the image capture method of photographing in batch that synthesizes an image from a plurality of images that obtained by different exposure, carries out being consisted of by the photography more than 1 or 2 time, according to the photography number of times of being photographed in batch by the brightness value photography of 1 preparation photography acquisition, with resembling prior art, repeatedly prepare photography and compare to set the photography number of times, can reduce fast gate delay. And, employing is according to described invention 12, for the image capture method of photographing in batch that synthesizes an image from a plurality of images that obtained by different exposure, carries out being consisted of by the photography more than 1 or 2 time, set in batch each conditions of exposure of photography according to the brightness value that is obtained by 1 preparation photography, with resembling prior art, repeatedly prepare photography and compare to set each conditions of exposure, can reduce fast gate delay.
[symbol description]
1 CCD imaging apparatus, 2 lens, 3 apertures, tripper
4 amplifiers, 5 A/D converters, 6 camera signal treatment loops
6-1 first memory 6-2 second memory 6-3 the 3rd memory
6-4,6-5 multiplier 6-6 synthesis loop 6-7 compression circuit
7 AFAEAWB loops, 8 CPU, 9 compression circuit
10 storage controls, 11 DRAM, 12 show circuits
13 LCD display parts, 14 storage card I/F, 15 storage cards
16 personal computer I/F, 17 personal computers, 18 timing generators
19 flash lamp mechanisms, 20 enter keies
Claims (14)
1, a kind of camera head, it is for synthesizing an image from a plurality of images that formed by different exposure, carrying out the photography in batch be made up of the photography more than 1 or 2 time, it is characterized in that being furnished with: the image mechanism of output photographs, measure according to photographs the body of being taken pictures brightness value light-measuring mechanism and set the aforementioned photography number of times set mechanism of the photography number of times of photography in batch according to the aforementioned brightness value that obtains by 1 preparation photography.
2, a kind of camera head, it is from the synthetic image of a plurality of images that formed by different exposure, carry out constituting photography in batch by the photography more than 1 or 2 time, it is characterized in that, be furnished with: the image mechanism of output photographs, measure by the light-measuring mechanism of the brightness value of photo-object according to photographs, with photography number of times set mechanism, described photography number of times set mechanism, under the aforementioned brightness value situation within the limits prescribed that obtains by the 1st preparation photography, set the aforementioned photography number of times of photography in batch according to aforementioned brightness value, under the situation beyond the scope of regulation, set the aforementioned photography number of times of photography in batch at the aforementioned brightness value that obtains by the 1st preparation photography according to the brightness value that condition is changed and prepare photography once more and obtained.
3, camera head as claimed in claim 1 or 2 is characterized in that, further is furnished with the exposure condition setting mechanism of each conditions of exposure when photographing in batch according to being set by the brightness value of photo-object of being obtained by aforementioned preparation photography is aforementioned.
4, camera head as claimed in claim 3 is characterized in that, aforementioned exposure condition setting mechanism has the benchmark exposure value set mechanism of setting the benchmark exposure value that forms the benchmark of setting aforementioned each conditions of exposure.
5, in the camera head as claimed in claim 3, it is characterized in that aforementioned benchmark exposure value set mechanism is set the first benchmark exposure value according to aforementioned brightness value, and then setting is changed corresponding to the aforementioned first benchmark exposure value, and set other benchmark exposure value.
6, camera head as claimed in claim 1 or 2, it is characterized in that, aforementioned light-measuring mechanism, has the piecemeal brightness value calculation mechanism that calculates each regional brightness value that aforementioned photographs is divided into as the piecemeal brightness value, aforementioned photography number of times set mechanism is set aforementioned photography number of times according to aforementioned distribution by the brightness value of photo-object and aforementioned piecemeal brightness value.
7, camera head as claimed in claim 6, it is characterized in that, aforementioned photography number of times set mechanism has the distribution ratio calculation mechanism, this distribution ratio calculation mechanism calculates the ratio of the piecemeal brightness value of high luminance range in the distribution that belongs to aforementioned piecemeal brightness value respectively or low luminance range.
8, camera head as claimed in claim 7, it is characterized in that, aforementioned photography number of times set mechanism in the aforementioned high briliancy or low luminance range of ratio more than setting of aforementioned piecemeal brightness value, is set the photography number of times with increase corresponding to the mode of the photography of the conditions of exposure of this scope.
9, a kind of camera head, it synthesizes an image, carries out constituting photography in batch by the photography more than 1 or 2 time from a plurality of images that formed by different briliancy conditions, it is characterized in that being furnished with: the image mechanism of output photographs, measure by the light-measuring mechanism of the brightness value of photo-object, and set the aforementioned exposure condition setting mechanism of each conditions of exposure of photography in batch according to the aforementioned brightness value that obtains by 1 preparation photography according to photographed images.
10, camera head as claimed in claim 9, it is characterized in that, an exposure value group as the exposure value group, from a plurality of exposure value groups of preparation selected according to aforementioned brightness value with the combination of benchmark exposure value that forms the benchmark of setting aforementioned each conditions of exposure by aforementioned exposure condition setting mechanism.
11, a kind of image capture method, it is for synthesizing an image from a plurality of images that formed by different conditions of exposures, carrying out constituting photography in batch by the photography more than 1 or 2 time, it is characterized in that, carry out 1 preparation photography, according to utilizing aforementioned preparation photography to measure by the brightness value of photo-object, set the aforementioned photography number of times of photography in batch according to aforementioned brightness value from the photographs of image mechanism output.
12, a kind of image capture method, its photography in batch for synthesizing an image, carry out constituting by the photography more than 1 or 2 time from a plurality of images that form by different conditions of exposures, it is characterized in that, carry out 1 preparation photography, according to utilizing aforementioned preparation photography to measure by the brightness value of photo-object, set the aforementioned conditions of exposure of photography in batch according to aforementioned brightness value from the photographs of image mechanism output.
13, a kind of image capture method, employing have to made a video recording by photo-object and the image capture method of the camera head of the exposure controlling organization of the exposure of the camera head of output image signal and the aforementioned camera head of control in, it is characterized in that, according to the preparation exposure information that in the shooting beamhouse operation, carries out, pick out luminance range in the photographic picture with a plurality of ranks, luminance range corresponding to aforementioned acquisition, aforementioned image mechanism is set different a plurality of exposures respectively, exposure according to aforementioned setting is exposed continuously, storage is by a plurality of original image informations of aforementioned exposure acquisition respectively, a plurality of original image informations of synthetic aforementioned storage form the information that dynamic range enlarges an image.
14, a kind of image capture method, it is from the synthetic image of a plurality of images that formed by different conditions of exposures, carry out the photography in batch that constitutes by the photography more than 1 or 2 time, it is characterized in that, in the photography beamhouse operation, be used to obtain the preparation photography of automatic exposure information at least, according to the photographs that obtains by this preparation exposure photography the luminance range in the photographic picture is estimated, luminance range corresponding to aforementioned acquisition, different exposure during the above-mentioned photography number of times of photographing in batch of photographing is photographed with each, conditions of exposure and exposure frequency according to aforementioned setting are photographed in batch, will be by this each photographs of obtaining of photographing in batch as raw image storage, a plurality of original image informations of synthetic aforementioned storage also form the information of the image that dynamic range enlarges.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| JP2002160929A JP4136464B2 (en) | 2002-06-03 | 2002-06-03 | Imaging apparatus and imaging method |
| JP160929/2002 | 2002-06-03 |
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| CN1467991A true CN1467991A (en) | 2004-01-14 |
| CN1232104C CN1232104C (en) | 2005-12-14 |
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| CN 03137229 Expired - Fee Related CN1232104C (en) | 2002-06-03 | 2003-06-03 | Pick-up device and picture pick-up method |
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| JP (1) | JP4136464B2 (en) |
| CN (1) | CN1232104C (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP4136464B2 (en) | 2008-08-20 |
| CN1232104C (en) | 2005-12-14 |
| JP2004007298A (en) | 2004-01-08 |
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