CN1263280C - Camera - Google Patents
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Images
Abstract
A camera according to this invention determines whether a subject to be photographed is backlit; and when it is backlit, compares a brightness of the subject with a brightness of a background of the subject by emitting strobe light onto the subject; and changes an amount of correction by at least one of a gamma conversion processes and a contour emphasizing process based on a result of the comparison, thereby processing a subject image signal detected by an imaging section.
Description
Technical field
The present invention relates to the improvement of the middle image processing techniquess of using such as Electrofax.
Background technology
Patent documentation 1: the spy opens flat 8-107519 communique (the 6th page of right-hand column the 25th row～the 46 row etc.)
Patent documentation 2: the spy opens flat 11-32236 communique (the 2nd page of left-hand column the 2nd row～the 6 row etc.)
Patent documentation 3: the spy opens the 2001-311867 communique
Patent documentation 4: the spy opens flat 10-79887 communique (～the 11 page of left-hand column of the 10th page of left-hand column the 28th row the 12nd row etc.)
Patent documentation 5: the spy opens 2002-44510 communique (the 2nd page of left-hand column the 2nd row～the 6 row etc.)
In recent years, the universal highly significant of digital camera, various users carry the photography that digital camera is being enjoyed various scenes.This digital camera is different with film cameras in the past, preserves image with the form of DID.At this moment, can use various image processing techniquess, still, therefore, digital camera is compared with the film cameras in past, machine kind difference, the reproducibility of image widely different.Otherwise, in digital camera,, then can photograph factitious, inaesthetic image if can not suitably use image processing techniques.Particularly in scenes such as backlight scene,, be difficult to reproduce the image of nature because the profile distortion of main subject etc. appears in oozing out of light.Therefore, the various technology of appropriate image processing of carrying out have in this case been proposed (for example, with reference to patent documentation 1～patent documentation 5.)。
For example, above-mentioned patent documentation 1 and 2 technology are: the Luminance Distribution of the picture data that obtain by imaging apparatus by analyses such as brightness block diagrams, and by detecting backlight change image processing method.But these technology are to use the image after the photography, obtain the technology of balance of the brightness of main subject and background.That is, under the big situation of the luminance difference of main subject and background,, need to sacrifice one of light or shade for the image of the nature that obtains main subject periphery.
In addition, though above-mentioned patent documentation 3 is the technology of carrying out image processing according to pattern, because need the user to set during image processing, so, the superior technology of the instant shooting property of can not saying so.
Summary of the invention
The present invention In view of the foregoing proposes, and purpose is to provide a kind of natural image that can obtain being fit to the photography scene, and the superior camera of shooting property immediately.
In order to achieve the above object, be characterised in that according to camera of the present invention: have: shooting part, it detects the subject image signal; Flash unit, it shines above-mentioned subject with flash light; The illumination condition decision means, its subject when having shone flash light by above-mentioned flash unit and the brightness of background compare, and judge the illumination condition of above-mentioned subject; The image processing parts, it is according to the comparative result of above-mentioned illumination condition decision means, and the correcting value that the change gamma transformation is handled or emphasizing contour is handled is to carrying out image processing by the detected subject image signal of above-mentioned shooting part.
In addition, in order to achieve the above object, have distance member in above-mentioned camera, it measures the distance of above-mentioned subject, and when making above-mentioned flash unit luminous, the range finding result according to above-mentioned distance member controls above-mentioned flash unit.
That is,, by to main subject light filling or carry out exposure correction and carry out optimized image and handle, can obtain all photograph images of colour developing naturally of main subject and background even under the situation that has very big luminance difference between background and the main subject.
In addition, compression mode such as JPEG is irreversible compress mode.That is, when not carrying out correct image processing, the important information in the image of losing before the compression is arranged, can't revert to the situation of original state, so improvement of the present invention is unusual important techniques.
Description of drawings
Fig. 1 is the block diagram of the structure of the camera that relates to of expression the 1st execution mode of the present invention.
Fig. 2 is the key diagram about the monitoring range of sensor array and image pickup part.
Fig. 3 (A) is the figure of the example of expression backlight scene; Fig. 3 (B) is the lightness distribution figure that illustrates in the scene of Fig. 3 (A); Fig. 3 (C) is the figure that is illustrated in the example of the scene behind the illumination flash light in the scene of Fig. 3 (A); Fig. 3 (D) is the lightness distribution figure that illustrates in the scene of Fig. 3 (C); Fig. 3 (E) is the figure that the example of the photography scene under the inaccessible situation of flash light is shown; Fig. 3 (F) is the lightness distribution figure that illustrates in the scene of Fig. 3 (E).
Fig. 4 (A) is the block diagram that the brightness of γ value when common is shown; Fig. 4 (B) is the block diagram that the brightness when reducing the γ value is shown; Fig. 4 (C) is the block diagram that the brightness of photoflash lamp after luminous is shown; Fig. 4 (D) is the block diagram that the brightness when increasing the γ value under the inaccessible situation of photoflash lamp is shown.
Fig. 5 is the lightness distribution figure that illustrates when not being the backlight scene.
Fig. 6 handles relevant key diagram with gamma transformation.
Fig. 7 (A) is the figure that represents the structure of emphasizing contour portion from functional perspective; Fig. 7 (B) is the key diagram relevant with the emphasizing contour computing.
Fig. 8 is the flow chart that the capture control program of the camera that the 1st execution mode of the present invention relates to is shown.
Fig. 9 illustrates because gamma transformation is handled, the key diagram of personage's hair and background assimilation.
Figure 10 is the flow chart that the control program of action before the photography of the camera that the 2nd execution mode of the present invention relates to is shown.
Figure 11 (A) illustrates the photoflash lamp pre-irradiation, from the location map of the integration amount of image pickup part output; Figure 11 (B) illustrates not in the main subject during the sufficient flash light of irradiation, from the location map of the integration amount of image pickup part output; Figure 11 (C) illustrates when main subject shone sufficient flash light, from the location map of the integration amount of image pickup part output.
Figure 12 is the flow chart of control program that the shadowgraph of the camera that the 3rd execution mode of the present invention relates to is shown.
Figure 13 (A) illustrates the curve chart that time of the integration amount of the background subject of photoflash lamp after luminous changes; Figure 13 (B) be illustrate photoflash lamp luminous after, the curve chart that time of the integration amount of the main subject when main subject has been shone sufficient flash light changes.
Figure 14 (A) illustrates the curve chart that time of the integration amount of the background subject of photoflash lamp after luminous changes; Figure 14 (B) be illustrate photoflash lamp luminous after, the curve chart that time of the integration amount of the main subject when main subject not being shone sufficient flash light changes.
Figure 15 (A) is the location map of brightness that the luminance difference hour of personage and background is shown; Figure 15 (B) is the key diagram of handling about the gamma transformation under the situation of Figure 15 (A); Figure 15 (C) is the location map that the brightness when big of the luminance difference of personage and background is shown; Figure 15 (D) is the key diagram of handling about the gamma transformation under the situation of Figure 15 (C).
Symbol description
1: s operation control portion (CPU); 2a, 2b: be subjected to the light microscopic head; 3a, 3b: sensor array; 4,7a: analog/digital (A/D) converter section; 5: phtographic lens; 5a: phtographic lens drives (LD) portion; 6: the photoflash lamp illuminating part; 6a: photoflash lamp illuminating circuit; 7: image pickup part; 7b: shutter portion; 8: gray correction portion; 9:RGB signal/YC signal (RGB/YC) converter section; 10: emphasizing contour portion; 10a: image processing part; 11: image compression portion; 12: recording portion.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
The 1st execution mode
Fig. 1 is the block diagram that the camera that one embodiment of the present invention relates to is shown.The picture of subject 20 incides image pickup part 7 by phtographic lens 5.In addition, image pickup part 7 is corresponding to " shooting part " put down in writing in claims.Image pickup part 7 is divided into the picture of the subject 20 of incident 3 kinds of color components (that is, the RGB composition) and carries out integration, and integration amount that will be corresponding with each color component outputs to analog/digital (A/D) converter section 7a as the subject image signal.A/D converter section 7a converts the integration output of input to digital quantity, outputs to image processing part 10a.
The digital integration output that is input to image processing part 10a (is called the picture data later on.) at first in gray correction portion 8, be carried out gray correction.The gray correction of this moment is exactly so-called gamma (γ) conversion process, and the γ value as on the grey scale curve of data of input is proofreaied and correct, and makes that the brightness of image is suitable.
By this gray correction portion 8, emphasize shade or light, the Luminance Distribution nature of the picture that human eye is seen when making image reproducing.In addition, image processing part 10a is corresponding to " the image processing parts " put down in writing in claims.
After gray correction portion 8 carried out gray correction, gray correction portion 8 outputed to rgb signal/YC signal (RGB/YC) converter section 9 with it.RGB/YC converter section 9 will become brightness (Y) signal and color coordinates (C as data transaction with what the signal of RGB composition was imported
R, C
B) signal.Then, this luminance signal that converts in the signal of YC composition is outputed to emphasizing contour portion 10, the color coordinates signal outputs to image compression portion 11.
The emphasizing contour that the high-contrast portion of image to input that carries out of emphasizing contour portion 10 emphasizes handles that (being also referred to as sharpening handles.)。Be described in detail later the explanation that this emphasizing contour is handled.
The image that has carried out image processing like this is input to image compression portion 11 from image processing part 10a.Image compression portion 11 records recording portion 12 with the image after this compression after the image of importing is compressed with modes such as JPEG.After as above handling, the image of photography records recording portion 12 by digital form.It is the arithmetic processor (CPU) 1 that is made of single chip microcomputer etc. that such a series of images is handled what control.In addition, CPU1 also carries out the photography control of camera.In addition, CPU1 comprises the function that " the backlight state decision section " put down in writing in claims reaches " image processing parts ".
The 7b of shutter portion is according to the signal of CPU1, the charge storage time of the image pickup part 7 that control is made of CCD etc.In addition, before photography, CPU1 drives (LD) 5a of portion by phtographic lens phtographic lens 5 is focused on.Also can focus on according to the subject range data that the output that utilizes A/D converter section 4 obtains.In addition, also can focus on from the peak value that image processing part 10a obtains the contrasting signal, this contrasting signal is by obtaining phtographic lens 5 each mobile small quantities.
Being calculated as of subject distance: at first, make by base length (parallax) B configuration only at interval 2 be subjected to picture imaging on sensor array 3a, 3b of the subject 20 that light microscopic head 2a, 2b obtain.According to the image position difference x based on the picture of the subject 20 of the parallax that is subjected to light microscopic head 2a, 2b of this moment, CPU1 calculates the subject distance according to the range of triangle principle.
In addition, the picture of the subject 20 by using sensor array 3a, 3b or imaging in image pickup part 7 (below, be called image signal), can investigate subject 20 is dark state or backlight state.
That is, say that from probability subject 20 is present in picture central authorities mostly, with regard to the example of Fig. 3 (A), the picture in left side is brighter than central authorities, so, can be judged as the backlight state.
In addition, if the integration of stipulated time, that is, charge storage after image data are still very low, can be judged as the low-light level state.Sensor array 3a, 3b and image pickup part 7 all are that the brightness of light of incident is strong more, and the photoelectric current of generation is big more, so if its integration is regulation electric capacity, the integrated value of then bright more place output is big more, the integrated value of dark more place output is more little.
In addition, in Fig. 1, use by the range unit that constituted by light microscopic head 2a, 2b, sensor array 3a, 3b and A/D converter section 4, the subject that the some place that represents minimum distance is existed is judged as main subject, according to the brightness of this point, can judge that bright still is darkness.That is,, can judge whether it is backlight by comparing with on every side integrated value.
In Fig. 2, represent the zone that the two sensors array monitors with regional 3c, represent the zone that image pickup part 7 monitors with regional 7c.Its result when subject 20 is dark states or during the backlight state, carries out light emitting control by photoflash lamp illuminating circuit 6a to photoflash lamp illuminating part 6, replenishes the exposure to subject 20.In addition, photoflash lamp illuminating part 6 is corresponding to " flash unit " put down in writing in claims.
Below, the example of the photography scene of expression the present invention imagination in Fig. 3 (A).When main subject personage 20 was the backlight state, it is big that background and personage's luminance difference becomes.
At this moment, in Fig. 3 (A), for example, photographic picture is stipulated coordinate y longitudinally
0Position when monitoring the brightness of x direction, obtain the curve shown in Fig. 3 (B).In this Fig. 3 (B), the position that is equivalent to background is bright, then is equivalent to personage 20 position then.At this moment, the photography scene of Fig. 3 (A) is the backlight state, so the left-half that is subjected to the personage 20 of outdoor influence of light becomes clear personage's 20 in doors right half part darkness.In this case, carrying out making photographs be received in the scope of regulation, that is, when allowing the exposure in the brightness range, background or personage's profile may disappear.Above-mentioned emphasizing contour is handled or gamma transformation is handled if carry out in this state, then after image processing, produces wrong profile, or produces at shade and to disturb (noise), or light becomes white, becomes factitious image.
Illustrate in greater detail this situation by the block diagram shown in Fig. 4 (A).In Fig. 4 (A), transverse axis is represented brightness BV, and the longitudinal axis represents to have the pixel that how much has the brightness that transverse axis represents with frequency.In the backlight scene, the luminance difference of light and shade is very big, so, the pixel count of the bright data of output and to export the pixel count of dark data many, the pixel count of the data in the middle of the expression is limited.Therefore, the part that can not discern in image is a lot.After the above-mentioned gamma transformation that has carried out making the γ value to reduce to this Fig. 4 (A) is handled, become Fig. 4 (B).
Gamma transformation to this moment is handled, and uses Fig. 6 to describe.Fig. 6 is the difference that the γ value when handling along with gamma transformation is shown, the curve how brightness of input and output image changes.That is, if the γ value diminishes (among the figure for γ=0.56), then the shade in the image is emphasized, the picture of shade becomes and sees easily, in addition, and the correction that variation is weakened to light.On the other hand, if the γ value becomes big (being γ=1.8 among the figure), then the shade in the image becomes darker, is filled by black, and the variation relevant with light emphasized.
Therefore, when gamma transformation that the γ value diminishes being handled, by emphasizing the shade among Fig. 4 (A), but this shade of emphasizing is entered in the differential threshold to Fig. 4 (A).But the semaphore of shade is original just few, disturbs the ratio with respect to signal to become big relatively.That is, if emphasize shade under these circumstances, the interference sections that then is included in the signal is also emphasized.Therefore, the continuity of the gray scale of shade is destroyed, has the worse situation of image after gamma transformation is handled.
Therefore, in the present embodiment, by in the photography scene shown in Fig. 3 (A), making photoflash lamp illuminating part 6 luminous, even in the photography scene shown in Fig. 3 (A), also can obtain the image shown in Fig. 3 (C), that is, not backlight state as shown in Figure 5, but but approach the image that background and main subject all enter the image of differential threshold.Promptly, obtain from the sensor array 3a, 3b or image pickup part 7 under the situation of Luminance Distribution shown in Fig. 3 (B) or the block diagram shown in Fig. 4 (A) with big luminance difference, illumination flash light, make it shown in Fig. 3 (D), by replenishing the light quantity of main subject body, improve Luminance Distribution, background and personage's picture is received within the limits prescribed.The block diagram of this moment is shown in Fig. 4 (C), and by the fill-in light that photoflash lamp sends, intermediate luminance increases, so, can write down the image of the exposure of having sacrificed shade.In this case, do not need specific brightness to be emphasized with the gamma transformation processing it also can be common processing that emphasizing contour is handled.
At this, use Fig. 7 (A), Fig. 7 (B), above-mentioned emphasizing contour is handled being described in detail.Fig. 7 (A) is the figure that is illustrated in the processing of the inside of the emphasizing contour portion 10 of Fig. 1 carrying out from functional perspective.
When being input to emphasizing contour portion 10 by the luminance signal data (the input Y of Fig. 7 (A)) 102 of RGB/YC converter section 9 conversion, at first, among the profile composition extracting circuit 10A in emphasizing contour portion, with the filter ranks of sharpening and the luminance signal data 102 procession computings (Fig. 7 (B)) of input.Like this, form the pixel data that middle body is emphasized, that is, and contour signal data 103.These contour signal data 103 have also been emphasized the interference component that comprises in the luminance signal data 102.Therefore, if using the contour signal data 103 that obtain to carry out emphasizing contour to whole pixels handles, it is unnatural that the image that obtains after then handling becomes, so, make the contrast of image with restricting circuits 10B more than or equal to regulation, that is, the operation result less than Δ Y among the figure is not input to add circuit 10C.
On the other hand, luminance signal data 102 also is input to add circuit 10C, and the output that luminance signal data 102 and contour signal data 103 are synthesized becomes the final output Y ' of emphasizing contour portion 10.
In addition, by the constant of filter ranks of change sharpening, can change the degree of emphasizing contour.In addition, by changing the Δ Y among the restricting circuits 10B, also can change the degree of emphasizing contour.In this case, increase Δ Y then emphasizing contour weakens, and reduces then emphasizing contour enhancing of Δ Y.
In addition, because the arrival distance of expression photoflash lamp is limited with the guide number of the relation of the aperture of camera, so, if during the subject hypertelorism, no matter shine how strong flash light, also can't make main subject is sufficient brightness, and the result becomes the image shown in Fig. 3 (E).
Do not reach at such flash light under the situation of main subject, if make exposure in the scope 1 of having only light to be received in Fig. 3 (F), then as Fig. 3 (E) shown in, background is correctly taken, and facial complete blackening of the personage 20.Therefore,,, that is, expose in the scope 2 of Fig. 3 (F), personage 20 face is correctly taken in the overexposure side to this scene.Then, in gamma transformation is handled, shown in Fig. 4 (D), increase the γ value, emphasize light, that is, the brightness of background changes, and makes the image of background not be destroyed.In addition, at this moment, still produced big luminance difference, if carry out emphasizing contour, then can become extremely factitious image, so will weaken emphasizing contour.
Fig. 8 carries out illustrated figure with the program that the photography of carrying out based on this idea, CPU1 is controlled as flow chart.
After beginning the photography control of this flow chart, the photography scene when photographing in order to judge at first, is calculated the range finding (step S1) of subject distance.Then, according to this subject distance that calculates, the control LD 5a of portion carries out the focusing (step S2) of phtographic lens 5.In addition, detect the interior brightness of photographic picture and the photometry (step S3) of distribution thereof.Then, according to these data, judge whether the photography scene is backlight (step S4).
That is, in sensor array 3a, 3b or image pickup part 7 the main subject 20 of imaging as the comparing very hour of data and background as data, being judged as the photography scene is backlight.Main subject body detecting method as this moment as previously mentioned, can adopt following method: detect range distribution in the picture with range unit, the object of expression minimum distance is judged as main subject.In addition, also know a kind of detection method: promptly go out the profile of subject,,, also can use this detection method then as main subject if its shape is personage's a shape according to the Data Detection of image pickup part 7.
In the judgement of above-mentioned steps S4, be judged as the photography scene when being the backlight scene, the luminous sign of photoflash lamp is made as " H " (step S5).Then, by known flash of light control (flashmatic: the guide number according to subject during) mode, the subject distance calculation photoflash lamp luminous quantity GN that obtains according to above-mentioned steps S1 apart from the control flash of light
0(step S6).Then, making under the luminous situation of photoflash lamp illuminating part 6, judge whether flash light arrives subject, that is, whether the subject distance that above-mentioned steps S1 obtains is than the arrival distance nearly (step S7) of photoflash lamp.
In the judgement of above-mentioned steps S7, arrive subject if be judged as flash light, then judge according to the picture data of background whether the exposure of background surpasses ormal weight (step S8).This judgement is to be used to judge whether background is exposed the judgement for discerning.That is, be used for judging whether exposure excessively causes background to discern.Specifically, the higher limit that whether surpasses the scope of image pickup part 7 according to the exposure of background is judged.Therefore, if the scope of image pickup part 7 is ± 2EV that then the afore mentioned rules amount is exactly+2EV, judges whether the exposure of background surpasses+2EV.At step S8, when the exposure that is judged as background surpasses ormal weight, in gamma transformation is handled, increase γ value (step S9), weaken after the setting of emphasizing contour (step S10), enter step S23.By increasing the γ value, can suppress the situation that above-mentioned background image becomes white.But, at this moment, because the light of background may be seeped into the profile of main subject, so, weaken the correction of emphasizing contour simultaneously.On the other hand, in the judgement of above-mentioned steps S8, when the exposure that is judged as background does not surpass ormal weight, be set at common γ value, that is, (step S11) proofreaied and correct in γ=1, afterwards, enters step S23.At this moment, because background image and main subject have been obtained the balance of brightness, so, the setting that does not need to change emphasizing contour.
In the judgement of above-mentioned steps S7, do not reach main subject if be judged as flash light, then judge and carrying out under the light-struck state of photoflash lamp, the not enough situation of the exposure of main subject whether at-2EV with interior (step S12).This judgement is to be used to judge whether main subject is exposed the judgement for discerning.That is be to be used for judging whether exposure is not enough, the judgement that winner's subject can't be discerned.In addition, the thresholding of judgement is not limited to-2EV, as long as it is just passable to judge whether main subject is exposed to discerning.Specifically, the lower limit that can whether be lower than the scope of image pickup part 7 according to the exposure of main subject is stipulated above-mentioned thresholding.In the present embodiment, the scope of image pickup part 7 is ± 2EV.Therefore, in this step S12, whether the not enough situation of judging main subject is in-2EV.At step S12, when the not enough situation that is judged as exposure is not in-2EV, think that flash light does not almost have help to exposure to the illumination of main subject, be set to carry out+exposure correction (step S13) of 1EV size, make shade become bright.By like this, the exposure of main subject is received in the scope of image pickup part 7.In addition, the exposure correction amount is not limited to+1EV, for example, as long as it is just passable to be decided to be the value that the exposure that makes main subject enters in the scope of image pickup part 7.In addition, if carry out excessive exposure correction, then the high part of brightness such as background will be over-exposed, so, as long as poor according to the exposure of main subject and background determined the exposure correction amount, it is interior just passable to make the exposure of main subject and background be received in the scope of image pickup part 7.Afterwards, γ value increase (step S14), emphasizing contour are weakened after the setting of (step S15), enter step S23.On the other hand, in the judgement of above-mentioned steps S12, when the not enough situation that is judged as exposure is in-2EV, then make the γ value increase (step S16), emphasizing contour weakens after the setting of (step S17), enters step S23.
In the judgement of above-mentioned steps S4, be judged as the photography scene when being not backlight, judge whether to make photoflash lamp illuminating part 6 luminous (step S18) according to light value.Make photoflash lamp illuminating part 6 luminous if be judged as, then the luminous sign with photoflash lamp is made as " H " (step S19).Afterwards, make the γ value reduce (step S20), emphasizing contour weakens after the setting of (step S21), enters step S23.At this moment, reduce the γ value, make shade bright as far as possible.But at this moment, as shown in Figure 9, the situation of shade that can't distinguish personage 20 hair and background is a lot, so, weaken the correction of emphasizing contour.On the other hand, in the judgement of above-mentioned steps S18, be judged as when not making photoflash lamp illuminating part 6 luminous, be set at and carry out γ with common γ value and proofread and correct (step S22), afterwards, entering step S23.
After above-mentioned action, judge whether the luminous sign of photoflash lamp is " H " (step S23).When the luminous sign that is judged as photoflash lamp is " H ", judges whether to set for and carry out exposure correction (step S24).Set for when carrying out exposure correction being judged as, behind the photoflash photography that has carried out having exposure correction (step S25), enter step S28.In the judgement of above-mentioned steps S23, when the luminous sign that is judged as photoflash lamp is not " H ", after having carried out not making the luminous common photography (step S26) of photoflash lamp illuminating part 6, enter step S28.In the judgement of above-mentioned steps S24, do not set for when carrying out exposure correction being judged as, after having carried out not having the photoflash photography (step S27) of exposure correction, enter step S28.
By above-mentioned action, after the photography of having carried out image,, carry out image processing (step S28) such as gamma transformation processing and emphasizing contour processing according to above-mentioned setting, photographs is recorded recording portion 12 (step S29).After photographs records recording portion 12, the photography of process ends figure control.
As mentioned above, according to this 1st execution mode, the light that carries out photoflash lamp according to the state of photography scene is auxiliary, by automatic selection suitable exposure correction and image processing, the control of photographing.Therefore, also can take over backlight scene that be difficult to reproduce etc. exactly, and, because the cameraman needn't operate, so, can provide instant shooting superior camera.
The 2nd execution mode
Below, with reference to Figure 10, the 2nd execution mode of the present invention is described.In addition, it is sensor array 3a, 3b etc. with device that the 2nd execution mode of the present invention is not provided with range finding, and the image pickup part 7 that the middle image pickup parts that are provided with such as use digital camera are Fig. 1 is found range.In addition, the CPU1 of this 2nd execution mode comprises the function that " the illumination condition decision means " put down in writing in claims reaches " control assembly ".In addition, other structure and action thereof are identical with the 1st above-mentioned execution mode, so omit explanation.
Figure 10 is the flow chart of the action control before the camera shooting that relates to of expression the 2nd execution mode of the present invention.In addition, the later action of the step S4 of the action after this flow chart and Fig. 8 much at one.
At first, CPU1 is taken into image (step S51) by image pickup part 7.Then, detect the contrast (step S52) of this image that is taken into.Then, judge whether detected contrast is the peak value (step S53) of contrast.When being judged as the peak value that is not contrast, behind phtographic lens 5 driving small quantities (step S57), turn back to above-mentioned steps S51.Repeat these actions, up to the peak value that detects contrast.
On the other hand, in above-mentioned steps S53, when being judged as the peak value that has detected contrast, judge whether needs photoflash lamp luminous (step S54) according to the brightness of image of this moment.Being judged as when not needing photoflash lamp luminous, jump out this flow chart, enter the step S4 of Fig. 8, by later action, do not make photoflash lamp illuminating part 6 luminous, photograph.
In the judgement of above-mentioned steps S54, be judged as when needing photoflash lamp luminous, the photoflash lamp that carries out little light quantity photoflash lamp is luminous in advance, is taken into the image (step S55) of this moment by image pickup part 7.If the image that this image and above-mentioned steps S51 are taken into compares, the contribution rate of the photoflash lamp in the time of just can understanding photography, in this way, whether flash light arrives subject during the prediction photography, whether the light-struck exposure status of photoflash lamp is information such as deficiency, calculates suitable photoflash lamp luminous quantity (step S56).Calculate after the photoflash lamp luminous quantity, jump out this flow chart, enter the step S4 of Fig. 8.
For example, suppose in above-mentioned steps S51, obtain integration amount shown in Figure 11 (A) promptly as data, suppose by the photoflash lamp of above-mentioned steps S54 luminous in advance, obtain the picture data shown in Figure 11 (B) or Figure 11 (C), then Figure 11 (A) and Figure 11 (B) or Figure 11 (A) and Figure 11 (C) poor (representing with STUP in the drawings) are just represented the ratio of the contribution of flash light.Photoflash lamp pre-luminous after, when having obtained the picture data of Figure 11 (B), the central portion i.e. brightness of the brightness ratio background of main subject is little, so, think that flash light do not contribute, the step S8 of Fig. 8 is branched off into step S9.On the other hand, after flash light was pre-luminous, when having obtained the picture data of Figure 11 (C), the brightness of background and the brightness of main subject were almost same level, so the step S8 of Fig. 8 is branched off into step S11.
As mentioned above,, do not use special range unit, and use the image pickup part of digital camera, control according to the photography that the photography scene suits according to this 2nd execution mode.Therefore, do not use special range unit, just the backlight scene that can be difficult to reproduce the past etc. is photographed.
The 3rd execution mode
With reference to Figure 12～Figure 15, the 3rd execution mode of the present invention is described.In addition, the structure of this 3rd execution mode can be suitable for the structure of above-mentioned the 1st execution mode or the 2nd execution mode.
At first, with reference to Figure 13 (A), Figure 13 (B), when under the backlight state, having carried out the photoflash lamp light emitting control, background and describe as the situation that the personage of main subject is controlled so as to suitable brightness.
The time of the integration amount of the background subject after Figure 13 (A) expression photoflash lamp is luminous changes.At this moment, flash light does not reach the background subject.But, because be exactly the backlight state originally, so, also can carry out the exposure of optimal level to the background subject in the suitable time for exposure even only with fixed light compositions such as natural daylights.
In addition, the time of the integration amount of the main subject of Figure 13 (B) expression photoflash lamp after luminous changes.At this moment, in the fixed light composition of main subject, add the auxiliary of flash light, also can carry out the exposure of optimal level in the suitable time for exposure.
But the luminous light of photoflash lamp is also limited.Therefore, only with fixing light such as natural daylights, then as Figure 14 (A), Figure 14 (B) shown in, sometimes in background when the time for exposure that suits reaches the exposure of optimal level, main subject does not still reach the exposure of optimal level.In addition, in Figure 14 (B), with poor the illustrating of the integration amount of main subject and the integration amount of background subject (suitable exposure levels) as " in shortage ".This in shortage can prediction according to the limit of the guide number of the photometry result before the photography and range finding result, photoflash lamp.
Figure 15 (A), Figure 15 (C) illustrate the example that the brightness from main subject body position to the background position changes.As mentioned above, when under-exposed,, change as the poor Δ BV of the brightness of the personage of main subject and background subject along with the difference of its not enough situation.This Δ BV hour promptly, under the situation shown in Figure 15 (A), does not change if do not emphasize this small light quantity, then can't separate personage and background clearly.Therefore, proofread and correct according to the gamma transformation processing of the characteristic shown in Figure 15 (B).In addition, also can carry out emphasizing contour.
On the other hand, shown in Figure 15 (C), background and personage's luminance balance is obvious when bad, the compression variation part, emphasizes that light can make the balance with background improve, so, carry out the gamma transformation of the characteristic shown in Figure 15 (D) and handle.
Photography control flow legend when Figure 12 illustrates the backlight that comprises the switching controls that above-mentioned gamma transformation handles.In addition, in this flow chart, the prerequisite of explanation is that the photography scene is a backlight, omits the explanation to the backlight judgment processing.
At first, CPU1 carries out be taken into (the step S61) of image by image pickup part 7.Then, carry out the focusing (step S62) of phtographic lens 5.In addition, though this focusing can be adopted the method for one of the 1st above-mentioned execution mode or the 2nd execution mode, use the method for the 2nd above-mentioned execution mode at this.
Then, it is luminous in advance that photoflash lamp illuminating part 6 is carried out, and is taken into the image (step S63) of this moment by image pickup part 7.Then, calculating makes the time for exposure (step S64) of background subject for suitable exposure levels.Afterwards, decision makes the luminous quantity (step S65) of main subject for the required photoflash lamp of suitable exposure levels.Then, obtain the poor Δ BV (step S66) of the brightness of main subject and background subject.
Then, judge that whether Δ BV is greater than prescribed level (step S67).If Δ BV is smaller or equal to prescribed level, that is, under the situation shown in Figure 15 (A), the gamma transformation that is set at Figure 15 (C) characteristic of the variation of emphasizing Δ BV is handled (step S68).Then, be set near the profile of emphasizing the Δ BV (step S69) after, enter step S73.
On the other hand, in the judgement of above-mentioned steps S67, during greater than prescribed level, that is, under the situation shown in Figure 15 (C), the gamma transformation that is set at Figure 15 (D) characteristic of the variation that weakens (compression) BV is handled (step S70) at Δ BV.Then, be set at the correction (step S71) that weakens near the profile of Δ BV.But, in this case because the light of background may bleach, so, be set at the profile (step S72) of emphasizing its light after, enter step S73.
After above-mentioned action, carry out photoflash photography (step S73).Then, carry out image processing (step 74) according to above-mentioned setting after, the image that obtains is recorded recording portion 12 (step S75).After recording an image to recording portion 12, the control of the shadowgraph of process ends figure.
According to basis the 3rd execution mode of above explanation, the difference of the background during according to backlight and the brightness of main subject is automatically carried out image processing.Therefore, can obtain the photo photography of the gray balance of background and subject.
Describe the present invention according to above-mentioned execution mode, still, the invention is not restricted to above-mentioned execution mode, in purport scope of the present invention, can carry out various distortion and application.
As mentioned above,, can provide the natural image that obtains being fit to the photography scene according to the present invention, and the superior camera of shooting property immediately.
Claims (12)
1. a camera has the shooting part that detects the subject image signal, it is characterized in that: have:
Flash unit, it shines described subject with flash light;
The illumination condition decision means, its subject when having shone flash light by described flash unit and the brightness of background compare, and judge the illumination condition of described subject;
The image processing parts, it is according to the comparative result of described illumination condition decision means, and the correcting value that the change gamma transformation is handled or emphasizing contour is handled is to carrying out image processing by the detected subject image signal of described shooting part.
2. camera as claimed in claim 1 is characterized in that: the subject that also has the distance that determines subject is apart from decision means,
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is that the exposure value of sufficient light quantity and background is during greater than setting, in described image processing parts, proofread and correct, make that the gamma value in the described gamma transformation processing becomes big.
3. camera as claimed in claim 1 is characterized in that:
The subject that also has the distance that determines subject is apart from decision means,
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is that the exposure value of sufficient light quantity and background is during greater than setting, in described image processing parts, proofread and correct, make that the emphasizing contour in the described emphasizing contour processing weakens.
4. camera as claimed in claim 3, it is characterized in that: according to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is that the exposure value of sufficient light quantity and background is during greater than setting, in described image processing parts, proofread and correct, make that the gamma value in the described gamma transformation processing becomes big.
5. camera as claimed in claim 1 is characterized in that:
The subject that also has the distance that determines subject is apart from decision means,
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is the exposure value of sufficient light quantity and background during less than setting, does not change the correcting value of described gamma transformation in handling in described image processing parts.
6. camera as claimed in claim 1 is characterized in that:
The subject that also has the distance that determines subject is apart from decision means,
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is the exposure value of sufficient light quantity and background during less than setting, does not change the correcting value of described emphasizing contour in handling in described image processing parts.
7. camera as claimed in claim 6, it is characterized in that: according to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is the exposure value of sufficient light quantity and background during less than setting, does not change the correcting value of described gamma transformation in handling in described image processing parts.
8. camera as claimed in claim 1 is characterized in that:
The subject that also has the distance that determines subject is apart from decision means,
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result is that deficiency in light quantity and its are in shortage during greater than ormal weight being judged as, and the exposure value increase is exposed.
9. camera as claimed in claim 1 is characterized in that:
The subject that also has the distance that determines subject is apart from decision means,
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is that deficiency in light quantity and its are in shortage during less than ormal weight, in described image processing parts, proofread and correct, make the gamma value in the described gamma transformation processing become big.
10. camera as claimed in claim 1 is characterized in that:
The subject that also has the distance that determines subject is apart from decision means,
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is that deficiency in light quantity and its are in shortage during less than ormal weight, in described image processing parts, proofread and correct, the emphasizing contour in the described emphasizing contour processing is weakened.
11. camera as claimed in claim 10 is characterized in that:
According to the subject distance of judging apart from decision means by described subject, judge whether described flash light is to the sufficient light quantity of subject, its result, being judged as is that deficiency in light quantity and its are in shortage during less than ormal weight, in described image processing parts, proofread and correct, make the gamma value in the described gamma transformation processing become big.
12. camera as claimed in claim 1 is characterized in that:
Have distance member, it measures the distance of described subject;
When making described flash unit luminous, the range finding result according to described distance member controls described flash unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| JP321314/2002 | 2002-11-05 | ||
| JP2002321314 | 2002-11-05 |
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| CN1263280C true CN1263280C (en) | 2006-07-05 |
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Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4040613B2 (en) * | 2004-08-31 | 2008-01-30 | キヤノン株式会社 | Imaging device |
| CN100435556C (en) * | 2005-10-31 | 2008-11-19 | 台湾新力国际股份有限公司 | Camera system |
| KR100793230B1 (en) * | 2006-07-24 | 2008-01-10 | 엘지전자 주식회사 | Apparatus and method for compensating a partial back light in camera |
| US8248485B2 (en) * | 2008-05-14 | 2012-08-21 | Panasonic Corporation | Imaging apparatus and imaging method |
| JP5281878B2 (en) * | 2008-12-03 | 2013-09-04 | オリンパスイメージング株式会社 | IMAGING DEVICE, LIGHTING PROCESSING DEVICE, LIGHTING PROCESSING METHOD, AND LIGHTING PROCESSING PROGRAM |
| CN101771826B (en) * | 2008-12-29 | 2011-09-14 | 华晶科技股份有限公司 | Digital shooting device and luminance correcting method thereof |
| JP5257695B2 (en) | 2009-05-20 | 2013-08-07 | アイシン精機株式会社 | Monitoring device |
| JP5737880B2 (en) * | 2010-08-20 | 2015-06-17 | キヤノン株式会社 | IMAGING DEVICE AND IMAGING DEVICE CONTROL METHOD |
| CN102209202B (en) * | 2011-06-01 | 2012-12-05 | 展讯通信（上海）有限公司 | Gamma correction curve extraction method for camera |
| CN104038684B (en) * | 2013-03-08 | 2018-08-10 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN103235465A (en) * | 2013-04-03 | 2013-08-07 | 深圳市光之谷新材料科技有限公司 | Photographic lamp |
| JP5761272B2 (en) * | 2013-08-06 | 2015-08-12 | カシオ計算機株式会社 | Imaging apparatus, imaging method, and program |
| CN104038704B (en) * | 2014-06-12 | 2018-08-07 | 小米科技有限责任公司 | The shooting processing method and processing device of backlight portrait scene |
| CN105357447B (en) * | 2015-10-30 | 2020-03-13 | 努比亚技术有限公司 | Picture processing method and device |
| CN105635583A (en) * | 2016-01-27 | 2016-06-01 | 宇龙计算机通信科技(深圳)有限公司 | Shooting method and device |
| CN106713780A (en) * | 2017-01-16 | 2017-05-24 | 维沃移动通信有限公司 | Control method for flash lamp and mobile terminal |
| CN107566695B (en) * | 2017-08-14 | 2019-07-02 | 厦门美图之家科技有限公司 | A kind of light compensation method and mobile terminal |
| JP7306269B2 (en) | 2017-10-24 | 2023-07-11 | ソニーグループ株式会社 | Control device, control method and program |
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