JP4525717B2 - Electronic camera device and strobe color correction method - Google Patents

Description

  The present invention relates to an electronic camera device such as a digital camera, and more particularly to a technique for correcting a strobe image.

  Conventionally, in an area where the amount of light is insufficient, an optical camera (silver salt camera) captures an image with a longer exposure time or compensates for the amount of light by emitting a strobe light. In the latter case, if the strobe is used, the exposure time can be shortened, so that images can be taken without fixing the camera even in a dark place.

  On the other hand, in an electronic camera device such as a digital camera, in a dark place (referring to a place where the amount of light is insufficient), a technique is used to pick up a bright image by increasing the sensitivity of the CCD (amplifying the signal from the CCD). However, there is a problem that if the sensitivity of the image sensor is increased too much in order to capture an image in a place where the amount of light is insufficient, an electrical noise component becomes conspicuous in the captured image and a good image cannot be obtained. In some places where the image is darker than a certain level, the electronic camera device is configured to be able to capture an image by using a strobe to compensate for the amount of light.

  In such an electronic camera device, when taking a strobe image, the color of the strobe light is added to the captured image, which is unnatural. Was applied to the entire captured image.

  However, since the above-mentioned conventional strobe color correction method uniformly applies a constant correction amount to the entire image, the color correction is excessive in the portion where the effect of strobe light is small in the image captured by the strobe light. There was a problem of becoming. For example, as shown in FIG. 5A, when a person 51 is flash-photographed against a white wall 53 in a relatively bright room, the person 51 that is properly exposed to the flash light can be photographed in natural colors by color correction. Since the white wall 53 and the object 52 behind the person 51 are less exposed to strobe light, if the same color correction as that of the person 51 (FIG. 5B) is performed, an unnatural color as shown in FIG. (When the background is the white wall 53, the color is yellow. In addition, the object 52 is unnatural in color).

  The present invention has been made based on the above-described problems and solutions of the prior art, and an object thereof is to provide an electronic camera device and a strobe color correction method capable of obtaining a natural color image during strobe imaging.

In order to achieve the above object, an electronic camera device according to a first aspect of the present invention is an electronic camera device capable of strobe imaging, an imaging unit that obtains a non-strobe captured image and a strobe captured image, and an imaging unit obtained by the imaging unit. Brightness extraction means for extracting the brightness of the non-strobe captured image and the brightness of the strobe captured image, and obtaining a brightness difference to obtain a brightness difference between the brightness of the non-strobe captured image extracted by the brightness extraction means and the brightness of the strobe captured image And the color correction of the strobe image obtained by the imaging unit with a correction amount proportional to the luminance difference obtained by the luminance difference acquisition unit, thereby canceling the hue of the strobe light included in the strobe image. comprising a strobe captured image correcting means, wherein the non-flash image is through image, sul obtained by the image pickup means And further comprising a display means for displaying an image.
According to a second aspect of the present invention , in the electronic camera device according to the first aspect, the luminance difference acquisition unit obtains a luminance difference of each part from luminances of a plurality of parts of the non-strobe captured image and the strobe captured image. And the stroboscopic image correction unit performs color correction of a plurality of portions of the stroboscopic image with a plurality of correction amounts proportional to a luminance difference between the portions.

The invention of claim 3, wherein, in the electronic camera device of the second aspect, the luminance extraction means, brightness and flash captured image through image obtained by the imaging means immediately before or immediately after the strobe captured image The luminance is extracted.

The invention of claim 4, wherein, in the electronic camera device of the above claim 1 or 2, wherein said imaging means is characterized by obtaining the non-flash captured image and flash captured image by strobe imaging instruction.
The invention of claim 5, wherein, in the electronic camera device according to any one of claims 1 to 4, further comprising a recording means for recording the flash captured image color correction by the said flash captured image correcting means It is characterized by.

Further, an invention according to claim 6, wherein a strobe color correction method definitive electronic camera apparatus capable of stroboscopic imaging, an imaging step of obtaining a non-flash captured image and flash captured image obtained in the imaging step non a luminance extracting a luminance of a strobe captured image of the strobe captured image obtained Ru brightness difference acquiring the luminance difference between the luminance brightness and flash captured image of the non-flash captured image extracted by the luminance extraction step The color of the strobe image obtained in the imaging step is corrected with a correction amount proportional to the luminance difference obtained in the step and the luminance difference acquisition step , so that the color of the strobe light included in the strobe image is obtained. includes a flash captured image correcting step of canceling, the, the non-flash image is through image, the imaging step And further comprising a display step of displaying a through image more obtained.

According to the present invention, it is possible to detect the effect on the strobe captured image due to how the strobe light strikes the target subject at the time of strobe light emission. Therefore, it is possible to perform highly accurate correction on the strobe captured image.

[Circuit configuration example]
FIG. 1 is a block diagram illustrating a circuit configuration example of a digital camera as an embodiment of an electronic camera device to which the present invention is applied. In FIG. 1A, the digital camera 100 includes an optical system 10 and a strobe light emitting unit. 11, a signal conversion unit 12, a signal processing unit 13, a DRAM 14, a control unit 20, an operation unit 30, a display unit 40, and a storage recording memory (memory card) 50.

  The optical system 10 includes an imaging lens 101, a light amount detection unit 102, and a focusing mechanism (not shown). A light beam of a subject image collected through the imaging lens 101 is displayed on a CCD (imaging device) 121 at the subsequent stage. To form an image.

  When the strobe light emitting unit 11 receives a shutter pressing signal from the control unit 20, the strobe light emitting unit 11 emits (emits light) a predetermined amount of light within an extremely short time to compensate for the surrounding light amount.

  The signal conversion unit 12 includes a CCD 121, a CCD drive timing signal generation circuit (TG) 122, a CCD drive vertical driver 123, an automatic gain control circuit (AGC) 124, and an A / D converter 125. Then, the image formed on the CCD 121 is converted into an electric signal, converted into digital data (hereinafter referred to as image data), and output at a constant cycle. The AGC 124 maintains the amplification factor of the signal from the CCD 121 at a predetermined value when the strobe is set or the peripheral light amount is not less than the lower limit of the threshold (φmin to φmax), but the strobe is not set and the peripheral light amount is appropriate. When the value is lower than the lower limit φmin of the threshold value (φmin to φmax), the signal from the CCD 121 is amplified by the AGC 124 under the control of the CPU and supplied to the A / D converter. The comparison result is fed back to the AGC 124 in comparison with the threshold value. As a result, the signal from the CCD 121 is amplified until the amount of light falls within the appropriate threshold.

  As shown in FIG. 1B, the signal processing unit 13 includes a color process circuit 131 and a DMA controller 132. The signal processing unit 13 performs color process processing on the output from the signal conversion unit 12 to generate digital luminance and color difference multiplexed signals (YUV data). The YUV data is transferred to a designated area of the DRAM 14 by DMA (direct memory access).

  The control unit 20 has a microprocessor configuration including a CPU, a RAM, and a program storage ROM. The CPU is connected to the above-described circuits via a bus line and stored in the program storage ROM. The entire digital camera 100 is controlled by the control program, and execution control of each function of the digital camera 100 is performed in response to the status signal from the operation unit 30. The program storage ROM uses a PROM, FROM (flash ROM), etc., and stores a strobe color correction program in addition to a control program and a processing program for each processing mode of the digital camera. Further, an area allocated to the DRAM 14 may be used instead of the RAM.

  As shown in FIG. 2, in addition to the shutter button 35 and the strobe setting button 36, the operation unit 30 includes keys such as a main power switch, a REC mode / playback mode switching switch, a function selection button, and a cursor movement key (not shown). When these keys are operated, a status signal corresponding to the status of the operated key is sent to the control unit 20. Further, a function as a color adjustment key may be assigned to the plus / minus (+ .−) key 37.

  The display unit 40 is composed of a display device such as a video random access memory (VRAM) and a liquid crystal screen. Since a subject image (through image) is displayed on the liquid crystal screen during imaging, the liquid crystal screen can be used as a viewfinder. . In addition, a playback image can be displayed in the playback mode.

  The storage recording memory 50 is composed of a removable recording medium such as a flash memory, and records image data and image information. In the embodiment, a memory card that is detachably attached to the main body of the digital camera 100 is used as the storage recording memory 50, but the present invention is not limited to this.

[Example of equipment appearance]
2A and 2B are schematic views of the digital camera 100 of FIG. 1, in which FIG. 2A is a front view and FIG. 2B is a rear view. A strobe light emitting unit 11, an imaging lens 101, and a light amount detecting unit 102 are provided on the front surface of the digital camera 100 as shown in FIG. In addition to the liquid crystal screen of the display unit 40 and the strobe display lamp 111, a main power switch, a REC mode / reproduction mode switching switch, and the like (not shown) are provided on the rear surface as shown in FIG. On the top surface, keys (not shown) such as a function selection button in addition to the shutter button 35, the strobe setting button 36, and the color adjustment button 37 are provided. The strobe display lamp 111 is composed of an LED or the like, and in the embodiment, two types of light emission display (lighting) of red and green are possible.

[DRAM 14 area setting example]
FIG. 3 is an explanatory diagram showing an example of setting areas of each buffer and the like in the DRAM 14 taking the circuit configuration of the digital camera 100 of FIG. 1 as an example. In this embodiment, the same DRAM 14 is used for image data output from the signal processing unit 13, image data output to the VRAM, and image data writing / reading at the time of data compression / decompression. Therefore, by preparing a buffer divided into several areas as shown in FIG. 3 as the configuration of the area for recording image data on the DRAM 14, each area can be set according to the purpose. In FIG. 3, symbol 141 is a through image buffer, 142 is an image buffer for storing a through image immediately before (or immediately after) the strobe imaging, and 143 is a buffer for storing a strobe image captured by strobe imaging (hereinafter referred to as a strobe image). 144), a color-corrected image buffer for storing an image after color correction, and 145 for recording luminance distribution data immediately before (or immediately after) imaging, luminance distribution data at the time of strobe imaging, and their differences and constants. A spare area 146 indicates a work area (work area). Although the image buffer 142 is provided in the example of FIG. 3, it may not be provided (FIG. 7). Further, the strobe image buffer 143 and the color correction image buffer 144 may be the same image buffer without providing the color correction image buffer 144.

[Example of luminance distribution]
FIG. 4 is an explanatory diagram of the luminance distribution of the image including the two subjects 51 and 52 and the background (white wall) 53 shown in FIG. 5A. FIG. 5 shows the captured image obtained by the strobe shooting and the strobe color correction process. It is explanatory drawing. FIG. 4A shows the actual luminance distribution of the through image of the subject in FIG. 5A, and FIG. 4B focuses on the person 51 in FIG. 5A and performs strobe imaging. FIG. 4C shows the resulting luminance distribution in the X direction, FIG. 4C shows the difference distribution obtained by subtracting the luminance distribution of FIG. 4A from the luminance distribution of FIG. 4B, and FIG. It is the distribution map which ranked and showed the difference of (c) to the ranks k1, k2, and k3 of 1-3 according to the magnitude | size. Although only the luminance distribution in the X direction is shown in the example of FIG. 4, the luminance distribution in the Y direction is acquired in the same manner in the embodiment (FIGS. 6 and 7).

  FIG. 5A is a diagram showing an example of a through image, and FIGS. 5B and 5C are explanatory diagrams of a conventional strobe color correction method and results thereof. Further, (b ') and (c') are explanatory diagrams of the strobe color correction and the result of the present invention.

[Flash color correction method]
(1) In one embodiment of the strobe color correction method of the present invention, as shown in steps S6 to S9 of the flowchart in FIG. 6, through image capturing and strobe imaging immediately before (or immediately after) the strobe imaging with one shutter operation. After taking the image and extracting the luminance from each captured image to obtain the distribution of the difference (FIG. 4 (c)), a correction amount proportional to the luminance difference distribution is added and the color of the strobe light Process to cancel.
(2) As another embodiment, as shown in steps T3 and T5 to T8 (or T3 ′ to T8) of the flowchart of FIG. 7, the luminance distribution of the through image immediately before (or immediately after) the strobe is acquired. And store (temporarily store) the brightness distribution of the strobe image, obtain the distribution of the difference between the two brightness distributions, add a correction amount proportional to the distribution of the brightness difference, and Performs processing to cancel the tint.
(3) As another embodiment, as shown in FIG. 8, the distribution of luminance differences obtained by the strobe color correction method of FIG. 6 or 7 is classified into about 2 or 3, and ranked. Strobe color correction corresponding to each part is performed so that the user can see the reproduced image and correct the hue.
In the above-described three embodiments, the brightness of the through image and the brightness of the strobe image may be compared, and the strobe color correction may not be performed on a portion where the difference is within a predetermined range.

[Operation Example 1]
FIG. 6 is a flowchart showing an example of the operation of the digital camera under the strobe imaging mode. In FIG. 6, (a) is an example in which a through image immediately before strobe imaging is used for comparison, and steps S6 to S9 correspond to strobe light correction processing. Further, (b) is an example in which a through image immediately after the strobe imaging is used as a comparison target.

Step S1: (Determining whether or not the flash is set)
In FIG. 6, when the imaging mode is selected, a through image is displayed on the display unit 40. If the user determines that flash photography is necessary from either the surrounding brightness or the brightness of the liquid crystal screen of the display unit 40, the user presses the flash setting button 36.

  When the imaging mode is selected, the control unit 20 checks the status signal from the operation unit 30 to determine whether or not the strobe setting button 36 has been pressed. If the strobe setting button 36 has been pressed, the strobe light emitting unit 11 is selected. Then, the strobe display lamp 111 is turned on and the process proceeds to S2, and if not, the process proceeds to another imaging mode. The strobe indicator lamp 111 lights red when the strobe is charged, and blue when the strobe is ready to emit light.

Step S2: (determining whether or not flash photography is possible)
Next, the control unit 20 compares the detected light amount L from the light amount detection unit 102 with the light amount required for imaging (threshold value φ), and if L <φ, the process proceeds to S3. Further, when L ≧ φ, the strobe setting is canceled so that the strobe image is not required, the light emission display by the strobe display lamp 111 is stopped, the charge application to the strobe light emitting unit 11 is stopped, and the normal image pickup mode is changed.

Step S3: (imaging instruction)
When the user presses the shutter button 35 at an arbitrary timing after the strobe is ready to emit light, the control unit 20 sends a control signal for setting the gain to a normal value (value based on the actual light amount) to the AGC 124. At the same time, a light emission instruction signal is given to the strobe light emitting unit 11.

Step S4: (Imaging: the previous through image)
The control unit 20 also stores the image (previous through image) captured in the through image buffer 141 immediately before the flash emission in the image buffer 142, and stores the storage area on the DRAM 14 for image data captured from the CCD 121. Switching to the image buffer 143, the process proceeds to S5.

Step S5: (Imaging: Strobe image)
After the operations in steps S3 and S4, the amplification factor of the signal from the CCD 121 is returned to the normal value, the strobe emits light, and the surrounding light amount is compensated by the light emission amount P. The signal from the CCD 121 increases by adding the light amount P supplemented by strobe light emission. The strobe image buffer 143 captures and stores a strobe image. Further, the control unit 20 switches the storage area on the DRAM 14 for data taken from the CCD 121 to the through image buffer 141.

Step S6: (Acquisition of luminance distribution of through image)
Next, the control unit 20 acquires (extracts) luminance distributions in the X direction (FIG. 4A) and Y direction of the captured image stored in the image buffer 142 and stores them in a predetermined area of the spare area 145 of the DRAM 14 ( Overwrite.

Step S7: (Acquisition of luminance distribution of strobe image)
The control unit 20 acquires the luminance distribution in the X direction (FIG. 4B) and Y direction of the strobe image captured from the CCD 121 into the strobe image buffer 143, and obtains a predetermined area (through image of the through image) in the spare area 145 of the DRAM 14. It is stored (overwritten) in a different location from the storage area of the luminance distribution.

Step S8: (Acquisition of luminance distribution difference)
The control unit 20 subtracts the luminance distribution value of the strobe image obtained in step S7 from the luminance distribution value of the captured image immediately before strobe emission obtained in step S6, respectively, in the X direction (FIG. 4C) and the Y direction. The difference distribution is acquired and stored in a predetermined area of the spare area 145 of the DRAM 14 (a place different from the storage area of the captured image immediately before the flash emission or the luminance distribution storage area of the flash image).

Step S9: (Strobe color correction proportional to the difference)
The control unit 20 synthesizes a correction color for canceling the hue of the strobe light with the strobe image stored in the strobe image buffer 143 so as to be proportional to the difference in luminance between the X direction and the Y direction obtained in step S6. Then, the result (image in which the color of the strobe light is canceled (composite image)) is stored in the color correction image buffer 144.

Step S10: (Image saving and recording process)
When the processing in step S9 is completed, the control unit 20 performs JPEG compression processing on the image in the color correction image buffer 144 (image after the strobe color correction processing), and then saves and records the image on the memory card 50 together with shooting information.

  The strobe color correction process cancels the strobe light in proportion to the difference between the brightness of the captured image immediately before the strobe fires and the brightness at the time of strobe shooting. In this way, a strobe image with a natural color can be obtained without excessive correction (FIG. 5C) in a portion where the strobe light is not applied, as in the uniform cancellation of strobe light on the strobe image (see FIG. 5C). FIG. 5 (c ′)).

  In the above operation example, the brightness of the captured image immediately before the flash emission is compared with the brightness of the captured flash image (difference is taken). However, as shown in FIG. 6B, the captured image and the captured image immediately after the flash are captured. You may make it compare the brightness | luminance of.

[Operation example 2]
FIG. 7 is a flowchart showing an example of the operation of the digital camera under the strobe imaging mode. In FIG. 7, (a) is an example in which a through image immediately before the strobe is captured is compared, and steps T3 and T5 to T8 correspond to strobe light correction processing. Further, (b) is an example in which a through image immediately after the strobe is captured is compared, and steps T4 ′ to T6 ′ correspond to strobe light correction processing. Further, the operations in steps T1 and T2 are the same as the operations in steps S1 and S2 in FIG.

Step T3: (Acquisition of luminance distribution of through image)
If it is determined in step T2 in FIG. 7 that strobe imaging is required, the control unit 20 determines the luminance distribution in the X direction and Y direction of the through image captured from the CCD 121 to the through image buffer 141 every time one frame is rewritten. Obtained (extracted) and stored (overwritten) in a predetermined area of the spare area 145 of the DRAM 14. The luminance distribution can be extracted (extracted) from the output of the color process circuit 131.

Step T4: (Imaging instruction)
When the user presses the shutter button 35 at an arbitrary timing after the strobe is ready to emit light, the control unit 20 sends a control signal for setting the gain to a normal value to the AGC 124 and also uses the strobe light emitting unit 11. A light emission instruction signal is given to the flash memory, and the storage area on the DRAM 14 for data taken in from the CCD 121 is switched to the strobe image buffer 143 to shift to T5.

Step T5: (Strobe imaging)
After the operation of step T4, the amplification factor of the signal from the CCD 121 is returned to the normal value, and then the strobe emits light to compensate the surrounding light amount by the light emission amount P. The signal from the CCD 121 increases by adding the light amount P supplemented by the strobe light emission, and the strobe image buffer 143 captures the strobe image.

Step T6: (Acquisition of luminance distribution of strobe image)
The control unit 20 acquires the luminance distribution in the X direction and the Y direction of the strobe image captured from the CCD 121 into the strobe image buffer 143, and obtains a predetermined area in the spare area 145 of the DRAM 14 (the storage area for the luminance distribution of the through image). Store (overwrite) in another location. The luminance distribution can also be extracted from the output of the color process circuit 131.

Step T7: (Acquisition of luminance distribution difference)
The control unit 20 subtracts the luminance distribution value of the strobe captured image obtained in step T6 from the luminance distribution value of the through image obtained immediately before imaging obtained in step T3 to obtain a difference between the X direction (FIG. 4C) and the Y direction. Is stored in a predetermined area of the spare area 145 of the DRAM 14 (a place different from the storage area of the luminance distribution of the through image or the strobe image).

Step T8: (Strobe color correction proportional to the difference)
The controller 20 captures the strobe image stored in the strobe image buffer 143 so that the correction color for canceling the hue of the strobe light is proportional to the distribution of the luminance difference in the X and Y directions obtained in step T7. And the result (an image in which the color of the strobe light is canceled (synthesized image)) is stored in the color correction image buffer 144.

Step T9: (Image recording process)
When the processing in step T8 is completed, the control unit 20 performs JPEG compression processing on the image in the color correction image buffer 144, and then saves and records it together with shooting information on the memory card 50.

  The strobe color correction process cancels strobe light in proportion to the difference between the brightness of the through image immediately before the strobe imaging and the brightness at the time of strobe imaging with respect to the strobe captured image. Similarly to the case, it is possible to obtain a stroboscopic image having a natural hue without excessive correction.

  In the above operation example, the brightness of the through image immediately before imaging is compared with the brightness of the strobe captured image (difference is taken). However, as shown in FIG. May be compared.

[Operation Example 3]
FIG. 8 is a flowchart showing an example of the operation of the digital camera under the strobe imaging mode. In this embodiment, the distribution of the difference between the brightness of the through image immediately before (or immediately after) the imaging in step S8 in FIG. 6 and step T7 in FIG. This is an example of ranking and performing strobe color correction corresponding to the rank.

Step U1: (Difference classification)
The control unit 20 classifies the difference distribution into 2-3 ranks. As a classification method, for example, the ratio of each difference in the X direction of the difference is determined by the difference between the portion with the largest difference and the portion with the smallest difference in the distribution in the X direction. It can classify | categorize by dividing and ranking (FIG.4 (d)). The distribution in the Y direction can also be classified in the same manner.

Step U2: (Image area ranking)
The control unit 20 combines the rank of the distribution in the X direction obtained in step U2 and the rank of the distribution in the Y direction to obtain a ranked region as shown in FIG. 9 (the rank with the highest luminance on the strobe captured image ( A region belonging to K1), a region belonging to the rank (K3) with the lowest luminance, and a region belonging to the intermediate rank (K2)).

Step U3: (Strobe color correction for each ranked area)
The control unit 20 corrects the correction colors (luminance ranks K1, K2,... For canceling the tint of the strobe light in the ranked areas (K1, K2, K3 in the example of FIG. 9) of the strobe captured image obtained in step U2. Correction amounts [delta] 1, [delta] 2, [delta] 3) corresponding to the average luminance (or median value, maximum value) [gamma] 1, [gamma] 2, [gamma] 3 of the area K3 are added to each partial area, and the result (an image in which the color of the strobe light is canceled ( The composite image)) is stored in the color corrected image buffer 144.

Step U4: (Display of strobe image after strobe color correction)
The control unit 20 takes out the strobe image captured from the color correction image buffer 144 and sends it to the display unit 40 to display a still image on the liquid crystal screen and display operation guides 71 to 73 as shown in FIG.

Steps U5 and U6: (Determination of operation content)
The control unit 20 examines the status signal from the operation unit 30. When the user presses the confirmation (OK) key (shutter button 35), the control unit 20 shifts to U9 and presses the color adjustment key (+/− key) 37. In this case, the process proceeds to U7, and if the cancel key is pressed, the process returns to U4.

Step U7: (Partial area color adjustment operation)
When the color adjustment key 37 is operated in step U6, the control unit 20 displays a cursor on the screen. The user moves the cursor with the cursor key to designate a part to be color-adjusted, and operates the color adjustment button 37 (+/−) to give a color adjustment instruction.

Step U8: (Partial area color adjustment processing)
The control unit 20 examines the status signal from the operation unit 30 to determine whether the color adjustment key 37 is + operated or −operated, and when it is + operated, the color correction amount δi (δi is the region K1 to K3). Among them, the color correction amount of the area Ki including the part pointed by the cursor is increased by a predetermined amount, and in the case of -operation, the color correction amount δi is decreased by a predetermined amount and added to the pointed partial area Ki, The result is stored in the color correction image buffer 144.

Step U9: (Image recording process)
The control unit 20 performs JPEG compression processing on the image in the color correction image buffer 144 and then saves and records the image on the memory card 50 together with shooting information.

  Since the strobe color correction of the strobe image can be performed for each area classified roughly according to the luminance by the strobe color correction process, a high-speed strobe color correction process can be performed. In addition, since the strobe color correction can be adjusted for the effect of the strobe light for each ranked area, even if there is an unnatural part in the result of the strobe color correction for each area, it can be easily adjusted.

  If the cursor is pointed at the boundary of the area ranked in step U5, the strobe color correction can be adjusted so that the color near the boundary becomes gentle.

It is a block diagram which shows the circuit structural example of the digital camera as one Example of the electronic camera apparatus to which this invention is applied. It is a general-view figure of a digital camera. It is explanatory drawing which shows the example of a region setting of each image buffer of DRAM. It is explanatory drawing of the luminance distribution of a through image and a strobe image. It is explanatory drawing of the captured image by strobe photography and strobe color correction processing. It is a flowchart which shows an example of operation | movement of the digital camera under strobe imaging mode. It is a flowchart which shows an example of operation | movement of the digital camera under strobe imaging mode. It is a flowchart which shows an example of operation | movement of the digital camera under strobe imaging mode. It is explanatory drawing of the area | region (on a strobe captured image) ranked by the magnitude of the difference distribution of a brightness | luminance. It is a figure which shows one Example of the screen for a confirmation (or correction) with respect to the result (still image) of strobe color correction.

Explanation of symbols

10 Optical system (imaging means)
12 Signal converter (imaging means)
13 Signal processor (imaging means)
20 control unit (image comparison means, strobe image correction means)
37 Color Adjustment Key 40 Display Unit 50 Storage Recording Memory, Memory Card 100 Digital Camera (Electronic Camera Device)
131 Color process circuit (luminance extraction means)

Claims (6)

In an electronic camera device capable of strobe imaging,
Imaging means for obtaining a non-strobe captured image and a strobe captured image;
A brightness extraction means for extracting the brightness of the non-strobe captured image obtained by the imaging means and the brightness of the strobe captured image;
A luminance difference obtaining unit for obtaining a luminance difference between the luminance of the non-strobe captured image and the luminance of the strobe captured image extracted by the luminance extracting unit;
The stroboscopic image that cancels the hue of the stroboscopic light contained in the stroboscopic image by performing color correction of the stroboscopic image obtained by the imaging unit with a correction amount proportional to the luminance difference obtained by the luminance difference acquisition unit Correction means;
With
The non-stroboscopic image is a through image, and further includes display means for displaying a through image obtained by the imaging means. The brightness difference acquisition means includes means for obtaining a brightness difference of each part from the brightness of a plurality of parts of the non-strobe captured image and the strobe captured image,
2. The electronic camera apparatus according to claim 1, wherein the strobe captured image correction unit performs color correction of a plurality of portions of the strobe captured image with a plurality of correction amounts proportional to a luminance difference between the portions.   3. The electronic camera apparatus according to claim 2, wherein the luminance extraction unit extracts the luminance of the through image obtained by the imaging unit and the luminance of the strobe captured image immediately before or immediately after the strobe captured image.   The electronic camera apparatus according to claim 1, wherein the imaging unit obtains the non-strobe captured image and the strobe captured image in response to a strobe imaging instruction.   5. The electronic camera device according to claim 1, further comprising a recording unit that records the strobe image that has been color-corrected by the strobe image correction unit. 6. A strobe color correction method in an electronic camera device capable of strobe imaging,
An imaging step of obtaining a non-strobe captured image and a strobe captured image;
A luminance extraction step for extracting the luminance of the non-strobe captured image obtained in this imaging step and the luminance of the strobe captured image;
A luminance difference acquisition step for obtaining a luminance difference between the luminance of the non-strobe captured image extracted in this luminance extraction step and the luminance of the strobe captured image;
Strobe imaging that cancels the tint of the strobe light contained in the strobe image by performing color correction of the strobe image obtained in the imaging step with a correction amount proportional to the brightness difference obtained in the brightness difference acquisition step An image correction step;
Including
The non-stroboscopic image is a through image, and further includes a display step of displaying a through image obtained in the imaging step on a display unit.

Images