JP2002040321A - Electronic camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic camera considering that the result of demarcation in the case of demarcating a subject image based on the difference of the influence rate of irradiating light is effectively utilized to set a photographing condition. SOLUTION: An image demarcating part 38 detects the luminance change of an image (a) at the time of emitting strobe light, which is the A/D output of a CCD 15 obtained by preliminary photographing with the light emission of a stroboscope 4, and an image (b) at the time of non-emitting the strobe light, which is the A/D output of the CCD 15 obtained by the preliminary photographing without the light emission of the stroboscope 4, and demarcates the subject image to a main part area and a background part area from the detected result so as to generate demarcation information (c). A photographing control part 32 utilizes the information (c) generated by the demarcating part 38 and sets the photographing condition such as an automatic focusing area (AF area), automatic exposure (AE area), the irradiation angle of the stroboscope and a focal distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an electronic camera that captures an image of a subject using a semiconductor imaging device such as a two-dimensional image sensor, and in particular, captures a result of dividing the subject image into a main area and a background area based on a difference in the influence rate of irradiation light. The present invention relates to an electronic camera that is considered to be effectively used for setting conditions.

[0002]

2. Description of the Related Art In recent years, a subject image is formed on a solid-state image sensor, for example, a CCD two-dimensional image sensor by an image pickup optical system and converted into an electric signal. A so-called electronic camera that records data on a recording medium such as a disk has been widely used.

An electronic camera of this type has a function of performing preliminary photographing as preparation for actual photographing and automatically adjusting photographing conditions based on image data of a subject image obtained in the preliminary photographing. There are many. Therefore, the user does not need much skill, and can perform shooting under appropriate shooting conditions according to the situation at that time.

[0004] Further, since the subject image photographed by the electronic camera is recorded as digital data called image data or the like, it is taken into a personal computer, and is divided into a near view and a distant view, that is, a main area and a background area. Various image editing can be freely performed, for example, by performing different processing for the area or cutting out only the main area.

However, conventionally, the automatic adjustment of the photographing conditions by the preliminary photographing is often performed by sampling image data corresponding to a predetermined fixed position such as the center of a subject image. In some cases, there is a possibility that the adjustment is performed targeting the background area instead of the main area. More specifically, for example, not only a subject having a composition in which a person is arranged at one corner of the scenery, but also a composition in which two persons are arranged in the center, the central portion to be sampled is placed between the two persons. There is a problem in that the adjustment is not performed as desired for a subject that does not look right.

[0008] Even though various image editing operations can be freely performed, it is necessary to have a considerable skill and a great deal of labor to clearly separate the subject image into a main area and a background area. Therefore, although it has been answered to some extent, there has been a problem that it is not very convenient for general users.

Further, for example, Japanese Patent Application Laid-Open No. 11-29890
In a night view sync mode in which a subject with a night view as a background is flashed as in the digital camera image processing method described in Japanese Patent Application Laid-Open No. 8-208, the background portion to which flash light does not reach falls below the black level as image data. Attempts have been made to optimize the focus and white balance in both the main part and the background part using this method. However, this method can be used only when the background is a night view, Since the level is used as a criterion, there is an inherent defect that, for example, when a main part such as a person wearing black clothes contains black, that part is also determined to be a background part.

In view of the above, for example, attention is paid to the difference in the influence of the irradiation light from a strobe or the like on each area of the subject image, and the change in brightness between when the light is emitted and when the light is not emitted is captured. Separation into the main part area and the distant view (background part area) makes it possible to execute the automatic adjustment of the photographing conditions without fail while targeting the main part area, and also requires skill and considerable labor. Without needing
Attempts have been made to make it possible to easily perform image processing such as performing different processing in the main part region and the background part region.

[0009]

However, in the prior art, the result of dividing the subject image into the main area and the background area based on the difference in the influence rate of the irradiation light is used for setting the photographing conditions. At present, no specific study has been conducted yet.

The present invention has been made in view of such circumstances, and a result of dividing a subject image into a main portion region and a background portion region from the difference in the influence rate of irradiation light is used for setting photographing conditions. An object of the present invention is to provide an electronic camera that is considered to be used effectively.

[0011]

In order to achieve the above-mentioned object, an electronic camera according to a first aspect of the present invention executes a first photographing operation with a strobe light emission and a second imaging operation without a strobe light emission. The subject image is divided into a main part region and a background part region based on a luminance change between two subject images obtained in the preliminary photographing, and the divided main part region is set as an object of the automatic focusing process. It is.

Further, the electronic camera according to the second aspect of the present invention is configured to perform a first photographing operation with a flash light emission and a second photographing operation without a strobe light emission between two subject images obtained by preliminary photographing. The subject image is divided into a main part region and a background part region based on a change in luminance, and the separated main part region is set as a target of the automatic exposure process.

Further, the electronic camera according to the third aspect of the present invention is an electronic camera according to the first aspect of the present invention, in which a first photographing with a strobe light emission and a second photographing without a strobe light emission are performed between two subject images obtained by a preliminary photographing. The subject image is divided into a main part region and a background part region from a change in luminance, and the auxiliary light irradiation angle is set for the divided main part region.

The electronic camera according to a fourth aspect of the present invention is an electronic camera according to the first aspect of the present invention, in which a first photographing operation with a strobe light emission and a second photographing operation without a strobe light emission are performed. The subject image is divided into a main part region and a background part region from the luminance change, and the focusing distance is set so that the area ratio between the divided main part region and the background part region becomes a predetermined ratio. Things.

In the electronic cameras according to the first to fourth aspects of the present invention, the results of the separation of the subject image based on the difference in the influence rate of the irradiation light are determined based on the automatic focusing area (AF area), the automatic exposure (AE area), and the strobe. This realizes effective use for setting photographing conditions such as an irradiation angle and a focusing distance.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view of an electronic camera according to an embodiment of the present invention.

As shown in FIG. 1, this electronic camera is roughly divided into a camera body 1 and a lens barrel 2.
The camera body 1 has an electronic viewfinder (EVF) 3
In addition to and flash 4, release button 5 as an operation unit,
A mode dial 6 and a cross key 7 are provided, and a color liquid crystal display (LCD) 8 is provided as a display unit.

Next, a detailed configuration inside the electronic camera according to this embodiment will be described with reference to FIG.

In FIG. 2, after the subject light has passed through a zoom lens 9 and an AF (automatic focusing) lens 10 provided in the lens barrel 2, the amount of light is controlled by a diaphragm 11. The zoom lens 9 includes the optical zoom unit 12 and the AF lens 1.
Numeral 0 is driven by an AF mechanism 13, and subject light having passed through the zoom lens 9, the AF lens 10 and the aperture 11 is guided into the camera body 1, and a shutter 14 is provided.
Is opened, the light enters a CCD two-dimensional color image sensor (hereinafter simply referred to as a CCD) 15 which is a color solid-state imaging device. As a result, a subject image is formed on the imaging surface of the CCD 15.

The CCD 15 constitutes an imaging surface by arranging a plurality of pixels for performing photoelectric conversion in a two-dimensional matrix.
Furthermore, a color filter is arranged on the imaging surface,
The signal charges corresponding to the subject image formed on the imaging surface are accumulated. The CCD 15 is provided with an imaging circuit 16, which controls exposure, reading, element shutter, gain adjustment, power supply, and the like. The output from the CCD 15 is converted into a digital signal by an A / D converter 17 and then guided to an image processing unit 18 where ISO sensitivity setting, auto white balance, luminance /
By performing color signal generation, gamma processing, and the like, a color image signal in a predetermined format is generated. The image processing unit 18 also executes a zoom ratio control in a resizing process or the like based on a control signal supplied from the electronic zoom unit 19.

The color image signal generated by the image processing section 18 is temporarily stored in a buffer memory 20 composed of, for example, a DRAM. This buffer memory 2
The liquid crystal control unit 21 is connected to 0, and the color image signal is
Here, after being converted into a form suitable for display output, it is supplied to a color liquid crystal display (LCD) 8 such as a TFT system and displayed as an image.

A compression / decompression unit 22 is further connected to the buffer memory 20. The compression / expansion unit 22 reads out the image signal stored in the buffer memory 20 and performs a compression (encoding) process, thereby forming a form suitable for recording on the recording medium 23. An expansion processing section for reading out image data recorded on the medium 23 and performing expansion (decoding) processing. As a method of this compression processing, for example, a JPEG method is used, but it is not limited to this. At the time of reproduction, the expanded image signal is temporarily stored in the buffer memory 20,
Color liquid crystal display (LC) via liquid crystal controller 21
D) Displayed as appropriate at 8. As the recording medium 23, for example, a memory card constituted by a semiconductor memory such as a card type flash memory is generally used.
The present invention is not limited to this, and various forms such as a magnetic recording medium such as a hard disk and a floppy (registered trademark) disk can be used.

This electronic camera is provided with a peeping type electronic viewfinder (EVF) 3 separately from a color liquid crystal display (LCD) 8, and is provided with respect to an output from an A / D converter 17. , Finder image generator 2
In step 4, a moving image process of n frames / sec is performed and displayed as a through image from the electronic viewfinder (EVF) 3 via the liquid crystal control unit 25 or from the color liquid crystal display (LCD) 8 via the liquid crystal control unit 21. Is done.

The strobe 4 is a light source for photographing a dark subject, and the amount of light emitted from the light emitting section 27 is controlled by a strobe control circuit 26. Strobe control circuit 26
Is provided with a strobe capacitor capable of storing a predetermined amount of electric charge, and drives the light emitting unit 27 by charging and discharging the strobe capacitor. Further, the illumination angle is controlled by driving the flash cover 29 by the motor 28.

The above operations are all controlled by the system controller 30, and the system controller 30 notifies the release button 5
The above-described operation control is executed in accordance with the contents of various operations such as pressing of the button.

The system controller 30 includes a photographing control unit 32, an image segmentation control unit 33, and an AF control unit 3.
4. An AE control unit 35, a zoom control unit 36, and a strobe control unit 37 are provided.

The photographing control section 32 controls each section of the camera based on the set photographing conditions, and provides necessary image processing parameters and the like. Note that the photographing conditions here include so-called exposure and shutter speed, whether or not strobe light is emitted,
This includes not only shooting conditions in a narrow sense common to silver halide cameras, such as light emission amount correction, but also image processing conditions such as white balance, color processing (color table), and gamma.

The image segmentation control unit 33 performs preliminary photographing, which is a preparation for the actual photographing, twice when the strobe 4 emits light and when the strobe 4 does not emit light. This is for realizing a control unique to the present invention, such as appropriately dividing the region into the background region and effectively supporting setting of photographing conditions and image processing by this division. This point will be described later. I do.

The AF controller 34 controls the A / D output of the CCD 15 in accordance with the contrast AF method based on the A / D output of the CCD 15 and photographing conditions.
The F mechanism 13 is controlled. In addition, the AE control unit 35
The drive of the aperture 11 and the shutter 14 is controlled based on the A / D output of D15 and the photographing conditions. Zoom control unit 36
Controls the optical zoom unit 12 based on the A / D output of the CCD 15 and shooting conditions. And the strobe control unit 3
7 is based on the A / D output of the CCD 15 and shooting conditions,
A signal for controlling the presence / absence of light emission and the amount of light emission is provided to the strobe control circuit 26 and the motor 28 is controlled.

Here, the preliminary photographing, which is realized by the image segmentation control unit 33 and is a preparation for the actual photographing, is performed by the strobe 4.
It is performed twice when the light is emitted and when the light is not emitted, and the subject image is appropriately divided into, for example, a main part area and a background part area by a change in luminance between the two. The control unique to the present invention, such as effectively supporting the control, will be described in detail.

For this control, the electronic camera is further provided with an image dividing unit 38 that is driven and controlled by the image dividing control unit 33.
Includes a separation information holding unit 39, a luminance change detection unit 40, and a separation processing unit 41.

The division information holding unit 39 stores the A / A of the CCD 15 obtained by the preliminary photographing with the emission of the strobe 4.
A / D of the CCD 15 obtained by preliminary photographing without the emission of the flash 4 and the image a at the time of the flash emission as the D output.
In addition to holding the flash output non-emission image b which is the D output, it also holds the separation information c generated through the luminance change detection unit 40 and the separation processing unit 41 based on these.

The luminance change detecting section 40 obtains a difference in luminance for each image data between the image a when the strobe light is emitted and the image b when the strobe light is not emitted, and transfers the result to the separation processing section 41.

Then, the division processing unit 41 divides the subject image into, for example, a main part and a background part from the information received from the luminance change detection unit 40, and stores the division result in the division information holding unit 39 as division information c. .

By providing the image segmenting section 38, the electronic camera can appropriately segment the subject image as shown in FIG. 3, for example, into a main area a1 and a background area a2 as shown in FIG. In other words, the setting makes it possible to effectively support setting of photographing conditions, image processing, and the like. The setting of the photographing conditions and support for image processing will be described later.

Next, with reference to FIG. 5 to FIG. 20, the principle of operation of the electronic camera regarding the separating function will be described.

This electronic camera has roughly two operation modes, a photographing mode and a reproduction mode.
As the photographing modes, there are a plurality of various photographing modes including a dividing photographing mode for operating the above-described dividing function. The operation mode is set by operating the mode dial 6.
When the cut-off shooting mode is set by the operation described above, the above-described cut-out processing is executed. Further, setting of various photographing conditions such as exposure and shutter speed is performed by selecting a menu item using the cross key 7.

Therefore, a user who wishes to operate the separation function first operates the mode dial 6 to set the operation mode to the separation photographing mode (FIG. 5).
In step A1), the user operates the cross key 7 to set other shooting conditions (step A2 in FIG. 5).

As described above, by providing the electronic camera with the division photographing mode as one operation mode, the above-described division function can be operated according to the user's request. Conversely, useless operation is not generated for an undesired user, so that the battery life is not deteriorated.

After completing this setting, the user presses the release button 5 to perform actual shooting.
In this divided shooting mode, prior to the actual shooting,
Preliminary photography is performed. FIG. 6 is a flowchart showing an operation procedure at the time of the preliminary photographing.

At the time of preliminary photographing, the photographing control unit 28 first executes a first photographing process while instructing the strobe control unit 31 to emit light from the strobe 4 (step B1 in FIG. 6) (FIG. 6).
Step B2), on the other hand, the image segmentation control unit 29
The A / D output (image a at the time of flash emission) of the CCD 15 obtained by this photographing process is stored in the separation information holding unit 33 (step B3 in FIG. 6).

Subsequently, the photographing control unit 28 executes a second photographing process (step B5 in FIG. 6) without instructing the strobe control unit 31 to emit the strobe light 4 (step B4 in FIG. 6). Then, the image segmentation control unit 29 stores the A / D output of the CCD 15 (the image b when the strobe light is not emitted) obtained by the photographing process in the segmentation information holding unit 33 (step B6 in FIG. 6).

Next, the image segmentation control unit 29 causes the luminance change detection unit 34 to compare the image a with strobe light emission and the image b without strobe light held in the segmentation information holding unit 33, thereby obtaining the luminance. The change is detected (step B7 in FIG. 6), and the separation processing unit 35 is caused to separate the subject image into, for example, a main part and a background part from the detected luminance change (step B8 in FIG. 6). At this time, the division processing unit 35 records the division result (division information c) in the division information holding unit 33 (FIG. 6).
Step B9).

The light that the strobe 4 reaches the subject decreases in proportion to the square of the subject distance. Therefore, the amount of reflected light from the subject incident on the camera becomes larger as the subject is closer, and becomes smaller as the subject is farther away. For example, when the sampling positions of the subject image shown in FIG. 3 are arranged as shown in FIG. 7A, the luminance value of the image a with strobe light emission and the luminance value of the image b with no strobe light emission are shown in FIG. 7 (b), and as a result, FIG.
Difference data is calculated as shown in FIG. And
The distance of the subject is detected based on the calculated difference data.

The division processing unit 35 performs the division of the main part area and the background part area of the subject image based on, for example, the following algorithm.

(1) A part where the luminance change occurs is defined as a main part area, and a part where the luminance change does not occur is defined as a background part area.

(2) A portion where a change exceeding a predetermined threshold value occurs is defined as a main portion region, and other portions are defined as a background portion region. This threshold value may be fixedly given or may be arbitrarily set by the user by operating the cross key 7 or the like.

(3) A threshold value is obtained by a predetermined calculation from the maximum value and the minimum value (no change) of the luminance change, and a portion where a change exceeding the obtained threshold value occurs is defined as a main portion area. A part other than is defined as a background part area.

The segmentation information c may be any information as long as it can separate the subject image into the main area and the background area. For example, the information indicating the outline of the main area and which side of the outline is determined. What is necessary is just to hold | maintain the information which shows a main part area | region.

Steps B1 to B3 in FIG.
Acquisition of image a at the time of strobe emission and Steps B4 to B4 in FIG.
The order of obtaining the image b when no flash is fired in step B6 may be changed.

Further, since the subject image is divided into a main part area and a background part area by the difference data calculated from the luminance value of the image a when the flash is emitted and the luminance value of the image b when the flash is not emitted, the background must be a night scene. There is no limitation that must be applied, and the present invention can be applied to daytime shooting.

As a result, appropriate segmentation is automatically performed without requiring any skill or labor of the user as in the related art.

When the preliminary photographing is completed, the actual photographing is executed. FIG. 8 is a flowchart showing the operation procedure at the time of the main shooting.

At the time of actual photographing, the photographing control unit 28 first inputs the division information c stored in the division information holding unit 33 (step C1 in FIG. 8), and sets various photographing conditions based on the division information c. (Step C in FIG. 8)
2).

For example, the following items can be considered as the setting items of the photographing conditions based on the separation information c.

(1) Automatic focus (AF) area: An AF area is set in the main part of the subject.

(2) Automatic exposure (AE) area: An AE area is set in the main part of the subject.

(3) Strobe irradiation angle: The irradiation angle is set according to the main part of the subject.

(4) Zoom ratio: The zoom ratio is set such that the main part of the subject is within a frame with a predetermined size.

As described above, by sampling image data corresponding to a predetermined fixed position such as the center of a subject image as in the related art, automatic setting of shooting conditions is performed not for the main part but for the background part. It is possible to prevent the adjustment from being performed.

Incidentally, (1) to (3) are for surely adjusting the target for adjustment to the main part. For example, as shown in FIG. 9A, even if the composition is such that the AF area b may be placed in an inappropriate area in the related art, as shown in FIG. AF area b is placed at FIG.
As shown in FIG. 10A and FIG. 10B, the irradiation area c of the strobe 4 is automatically adjusted according to the position of the main part area in the subject image.

On the other hand, (4) controls the focal length so that the ratio between the main part and the background part is within a predetermined value in composition. For example, as shown in FIG. The focal length is adjusted so that the image becomes a subject image as shown in FIG. This adjustment is performed by the optical zoom unit 12.
, And the electronic zoom control by the electronic zoom unit 19, or both. This function is effective when, for example, creating an entrance permit with a face photograph and taking a photograph of the face photograph with a predetermined ratio of space in the frame.

When the setting of the photographing conditions is completed, the photographing control section 28 executes a photographing process based on the photographing conditions (step C3 in FIG. 8), and then, based on the previously input cutting information c, Image processing is performed on the subject image obtained by this photographing processing (step C in FIG. 8).
4).

According to the segmentation information c, for example, the following image processing can be performed.

(1) Different sensitivity (ISO) processing is executed in the main part area and the background part area.

(2) Different sharpness processing is executed between the main part area and the background part area.

(3) Blur only the background area or change the color.

More specifically, for example, sensitivity processing is performed on a main part area of a subject image photographed in a backlight situation to increase the sensitivity, and sensitivity processing is performed on one background part area to reduce the sensitivity. This makes it possible to make the main part region where the light is weak bright, and to darken the background part where the light is too strong. In addition, by performing a sharpness process with a higher degree of emphasis on the main portion region than the background portion region, it is possible to make the main portion region stand out more.

For example, the sensitivity is set to ISO only in the main area.
By performing different sensitivity processing between the main part area and the background part area, for example, by correcting twice from 100 to ISO 200 and leaving the background part area at ISO 100, the dark main part area a1 as shown in FIG. Thus, more effective image processing, such as correcting only the image brighter, can be executed.

It is preferable that these functions be further provided with an automatic mode and a manual mode in accordance with the operation of the cross key 7, for example. In the sensitivity processing in the automatic mode, a main portion area is extracted from the image stored in the buffer memory 20 after the main shooting, and the brightness is integrated to determine whether the brightness is appropriate. If it is not appropriate, the image processing unit 18 performs sensitivity correction only on the main area. If the reference is ISO100, ISO200, 400,...
And increase the sensitivity. Conversely, if it is too bright,
The sensitivity may be lowered to O50, 25. After the above processing is completed, this image is compressed and recorded on the recording medium 23.

On the other hand, the sensitivity processing in the manual mode
This is possible even after being recorded on the recording medium 23,
The brightness of the reproduced image is set to a desired value by raising or lowering the ISO sensitivity while operating the cross key 7. At this time, the sensitivity correction of the main area is performed in the image processing unit 18 according to the setting, and the user can arbitrarily perform the brightness correction while actually viewing the corrected image. Then, after a series of operations is completed, an image in which the main part area has been corrected to the set ISO sensitivity is automatically recorded on the recording medium 23. Further, in this manual mode, the main area may be left as it is, and only the ISO sensitivity of the background area may be arbitrarily set.

In the sharpness processing in the automatic mode, the image processing unit 18 automatically performs a sharpness processing with a high degree of emphasis on the main area and a sharpness processing with a low degree of emphasis on the background area. , An arbitrary degree of emphasis can be set for each of the main area and the background area.

The background can be blurred by this sharpness processing. For example, it may be performed by cutting the high frequency component of the spatial frequency of the luminance data with a low-pass filter, or by thinning out the image data. The resizing process may be performed by performing a resizing process to reduce the image to an original size without performing interpolation. Further, the color is changed by replacing the image with image data of a predetermined color or pattern or a color or pattern prepared by the user. For example, taking the face photograph used for the above-mentioned admission permit as an example, the background can be easily replaced with a predetermined color, so that not only compositional considerations are unnecessary, but also the selection of shooting locations including the background can be made. Not required.

After the end of the image processing, the photographing control unit 32 executes an image recording process based on the division information c previously inputted (step C5 in FIG. 8).

As the image recording process based on the separation information c, for example, the following is conceivable.

(1) The main area and the background area are recorded as separate files. In this case, for example, predetermined dummy data is supplemented in the background area of the file in which the main area is recorded. As the dummy data, data of a predetermined color may be used, or other predetermined identification data may be used. The association between the two files may be performed according to a naming rule, or may be stored as a pair in the same directory. Alternatively, link information for managing these associations may be separately stored. Further, in this case, it is preferable to record the segmentation information c as another file and perform the association.

(2) The main area and the background area are recorded as the same file, and the segmentation information c is recorded as another file. The association between the two files in this case is
Same as (1).

(3) The main area and the background area are recorded as the same file, and the division information c is stored as header information in the file.

When the main area and the background area are recorded as separate files, for example, the following can be further performed as an image recording process based on the separation information c.

(1) Encoding is performed at different compression rates in the main part area and the background part area.

(2) Encoding is performed at different pixel thinning rates in the main area and the background area.

(3) Encoding is performed with different bit widths in the main part area and the background part area.

That is, the main area can be encoded at a higher resolution than the background area, and image data can be more efficiently recorded on a recording medium having a finite capacity. For example, as shown in FIG. 13, when the high image quality mode (SHQ) is set, only the number of pixels in the background area is reduced from 1600 × 1200 to 1024 × 768, and Only compression ratio is 1
Increase from / 8 to 1/16. Similarly, when the standard image quality mode is set, only the number of pixels in the background area is set to one.
From 024 × 768 to 640 × 480, only the compression ratio of the background area is increased from ８ to 1/16.

By recording the main area and the background area as separate files, other electronic devices such as a personal computer and a printer can handle only the main area.

As described above, in this electronic camera, by focusing on the degree of influence of the light emitted from the strobe 4 on the subject image, the subject image can be converted into, for example, a main part area and a background part area without adding special parts. Appropriately,
This division makes it possible to effectively support imaging processing, image processing, and the like.

Further, the separation information c obtained by the electronic camera is effective not only in the shooting mode but also in the reproduction mode.

For example, based on the separation information c,
Only the main area is cut out from the subject image and displayed (Fig. 1
(Step D1 of Step 4), and then combine and display the cut-out main part area and a separately prepared background image (Step D2 of FIG. 14). Then, the composited image is re-recorded on the recording medium 22 as desired by the user (step D3 in FIG. 14). For example, taking the above-described subject image in FIG. 3 as an example, it is possible to easily create an image as shown in FIG. 16 by synthesizing the main region and a background image as shown in FIG. Become.

As described above, various kinds of reproduction processing and processing can be performed by holding the division information c for appropriately dividing the subject image into, for example, the main part area and the background part area.

In the above-described embodiment, an example has been described in which the preliminary photographing is executed as preparation for the main photographing. This is because it is assumed that the segmentation information c is reflected in the photographing conditions. Considering that only the processing is used, the processing may be executed as post-processing of the main photographing. In this case, it is possible to perform preliminary photographing for obtaining the segmentation information c without causing a time lag between the moment when the user captures a photo opportunity and the actual photographing.

Here, FIGS. 17 and 18 show variations of the sequence between the preliminary photographing and the actual photographing and the sequence of the preliminary photographing.

As shown in FIG. 17, a variation of the sequence between the preliminary photographing and the main photographing is a first pattern (FIG. 17) in which the preliminary photographing is executed as a pre-process of the main photographing.
(A)) and a second pattern (FIG. 17 (b)) in which the preliminary photographing is executed as a post-process of the main photographing.

The first pattern is applied to the case where the main photographing is executed after executing the preparation processing including the setting of the photographing conditions based on the segmentation information c obtained by the preliminary photographing,
The second pattern is applied when the segmentation information c obtained by preliminary photographing is used only for image processing.

On the other hand, as a variation of the sequence of the preliminary photographing, as shown in FIG. 18, the preliminary photographing (ST) with the emission of the strobe 4 is executed for the first time, and the preliminary photographing without the emission of the strobe 4 is performed for the second time. First to execute (non-ST)
(FIG. 18 (a)), a second preliminary photographing (ST) without flash 4 emission is performed, and a second preliminary photographing (ST) with flash 4 emission is performed. (FIG. 18 (b)) and a third pattern (FIG. 18 (c)) in which preliminary photographing (ST1, ST2, non-ST) involving emission of the strobe 4 is performed a plurality of times while changing the light amounts thereof. And the like.

The first and second patterns are mainly applied to the case where a subject image is divided into two regions of a main portion region and a background portion region, and the third pattern is a device in which at least two or more subject images are divided. Applied when separating into regions. In this case, it is necessary to hold a plurality of images a at the time of strobe light emission, but by using these, it is possible to perform multi-stage area segmentation according to the distance. For example, it is possible to individually cut out each of the subjects d1 to d3 from a subject image as shown in FIG. 20 obtained by shooting in a situation as shown in FIG. 19, whereby the automatic adjustment of the shooting conditions is more finely controlled. Or more diverse image processing can be performed. Also, for example, when the sampling positions are arranged as shown in FIG. 21A for the subject image shown in FIG. 20, when the light amount of the strobe 4 is large as shown in FIG. There is a possibility that the brightness value of the subject d1 that is short in distance is saturated and the subject d1 cannot be clearly detected. On the other hand, when the light amount of the strobe 4 is small, the brightness value of the subject d3 that is farthest in distance cannot be distinguished from noise. Although the subject d3 may not be detected, the third pattern in which the preliminary photographing with the emission of the strobe light 4 is performed a plurality of times while changing the light amounts thereof,
Each of the subjects d1 to d3 can be appropriately detected from a plurality of flash emission images a thus obtained.

In the case of the third pattern, it is preferable that a plurality of preliminary shots are performed for each light amount, and that the addition and averaging are performed, thereby reducing errors and improving accuracy. It becomes possible.

In the case of the second pattern of the sequence between the preliminary photographing and the main photographing shown in FIG. 17, the image of the main photographing can be used as the image b when the strobe is not fired. Preliminary photographing without light emission can be omitted.

Also, in the above-described embodiment, an example has been described in which the subject image is divided into two parts, a main part area and a background part area, from two images, that is, an image a with flash light emission and an image b with no flash light emission. For example, the division processing unit 35 can create a histogram of the luminance change appearing between the image a when the flash is fired and the image b when the flash is not flashed, and can divide the subject into three or more from this histogram. That is, similar to the case where the preliminary photographing with the emission of the strobe light 4 is performed a plurality of times while changing the light amounts thereof, the subject image as shown in FIG. From each subject d
1 to d3 can be individually cut out, whereby the automatic adjustment of the photographing conditions can be more finely controlled, or more various image processing can be performed.

[0099]

As described above in detail, according to the electronic camera of the present invention, it is possible to obtain the preliminary photographing in which the first photographing with the strobe light emission and the second photographing without the strobe light emission are executed. When a subject image is divided into a main part region and a background part region based on the luminance change between the two subject images, the result of the division is referred to as an automatic focusing area (AF area), an automatic exposure (AE).
Area), strobe irradiation angle, focusing distance, and other shooting conditions can be effectively used.

[Brief description of the drawings]

FIG. 1 is an external view of an electronic camera according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of the inside of the electronic camera of the embodiment.

FIG. 3 is an image of a subject for explaining a dividing function of the electronic camera of the embodiment.

FIG. 4 is a diagram showing a result of dividing the subject image of FIG. 3 into a main part and a background part.

FIG. 5 is an exemplary flowchart illustrating an operation procedure when setting a shooting mode / condition of the electronic camera according to the embodiment.

FIG. 6 is an exemplary flowchart illustrating the operation procedure of the electronic camera according to the embodiment at the time of preliminary shooting processing.

FIG. 7 is an exemplary view for explaining the principle of detecting the distance of the subject of the electronic camera of the embodiment.

FIG. 8 is an exemplary flowchart showing the operation procedure of the electronic camera of the embodiment at the time of actual shooting processing.

FIG. 9 is an exemplary view for explaining an automatic adjustment function of a shooting condition (AF area) of the electronic camera according to the embodiment.

FIG. 10 is an exemplary view for explaining an automatic adjustment function of a photographing condition (flash irradiation area) of the electronic camera according to the embodiment.

FIG. 11 is an exemplary view for explaining an automatic adjustment function of shooting conditions (focal length) of the electronic camera according to the embodiment.

FIG. 12 is an exemplary view for explaining an example in which different sensitivity processing is performed on a main part and a background part of the electronic camera of the embodiment.

FIG. 13 is an exemplary view for explaining an example in which different recording processes are performed on a main part and a background part of the electronic camera of the embodiment.

FIG. 14 is an exemplary flowchart showing the operation procedure at the time of display / re-recording processing of the electronic camera of the embodiment.

FIG. 15 is an exemplary background image for explaining the composition processing of the electronic camera according to the embodiment;

16 is a diagram showing a result of synthesizing the background image of FIG. 15 and the clipped main part image.

FIG. 17 is an exemplary view showing a variation of a sequence between preliminary shooting and main shooting of the electronic camera of the embodiment.

FIG. 18 is an exemplary view showing a variation of a sequence of preliminary photographing by the electronic camera of the embodiment.

FIG. 19 is an exemplary view showing a shooting situation for explaining an example in which the subject image of the electronic camera of the embodiment is separated into at least two or more regions.

FIG. 20 is an exemplary view showing the subject image for explaining an example in which the subject image of the electronic camera of the embodiment is separated into at least two or more regions;

FIG. 21 is an exemplary view for explaining an effect of executing a plurality of times of preliminary photographing with flash emission of the electronic camera according to the embodiment while changing the light amounts thereof;

[Explanation of symbols]

 Reference Signs List 1 camera body 2 lens barrel 3 electronic viewfinder (EVF) 4 strobe 5 release button 6 mode dial 7 cross key 8 color liquid crystal display (LCD) 9 zoom lens 10 AF Focus) lens 11 ... aperture 12 ... optical zoom unit 13 ... AF mechanism 14 ... shutter 15 ... CCD two-dimensional color image sensor (CCD) 16 ... imaging circuit 17 ... A / D converter 18 ... image processing unit 19 ... electronic zoom unit 20 ... Buffer memory 21 ... Liquid crystal controller 22 ... Compressor / decompressor 23 ... Recording medium 24 ... Finder image generator 25 ... Liquid crystal controller 26 ... Strobe control circuit 27 ... Light emitting unit 28 ... Motor 29 ... Strobe cover 30 ... System controller 31 ... Operation Unit 32: Shooting control unit 33: Image separation control unit 34: AF control unit 35: AE control unit 36 zoom control unit 37 strobe control unit 38 image separation unit 39 separation information storage unit 40 luminance change detection unit 41 separation processing unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 15/05 H04N 5/232 A 5C022 19/02 101: 00 H04N 5/232 G02B 7/11 N // H04N 101: 00 G03B 3/00 A F-term (reference) 2H002 CD00 CD11 CD13 DB24 DB25 DB26 DB30 DB32 JA07 2H011 AA03 BA31 DA01 DA07 2H051 AA00 BA47 DA03 DA19 DA22 DA23 DA31 EB01 EB07 2H053 AD00 AD21 AD23 CA44 2H05A A022 AB15 AB28 AB30 AB62 AC03

Claims (4)

[Claims] 1. An electronic camera for capturing an image of a subject by a semiconductor imaging device, wherein: an auxiliary light irradiating means for irradiating an auxiliary light;
Preliminary photographing means for performing photographing of the subject and second photographing without using the auxiliary light irradiating means; detecting means for detecting a change in luminance between two subject images photographed by the preliminary photographing means; A dividing unit that divides the subject image into a main part region and a background part region based on a change in luminance detected by: a photographing condition setting unit that sets the main part region divided by the dividing unit as a target of the automatic focusing process; An electronic camera, comprising: 2. An electronic camera for photographing a subject image by a semiconductor image pickup device, comprising: an auxiliary light irradiating means for irradiating an auxiliary light;
Preliminary photographing means for performing photographing of the subject and second photographing without using the auxiliary light irradiating means; detecting means for detecting a change in luminance between two subject images photographed by the preliminary photographing means; A dividing unit that divides the subject image into a main part region and a background part region according to a change in luminance detected by: a photographing condition setting unit that sets the main part region that is divided by the dividing unit as a target of automatic exposure processing; An electronic camera comprising: 3. An electronic camera for capturing an image of a subject by a semiconductor imaging device, wherein: an auxiliary light irradiating means for irradiating an auxiliary light;
Preliminary photographing means for performing photographing of the subject and second photographing without using the auxiliary light irradiating means; detecting means for detecting a change in luminance between two subject images photographed by the preliminary photographing means; Dividing means for dividing the subject image into a main part area and a background part area based on the change in luminance detected by: a photographing condition setting means for setting an irradiation angle of auxiliary light for the main part area divided by the dividing means An electronic camera, comprising: 4. An electronic camera for photographing a subject image by a semiconductor image pickup device, wherein: an auxiliary light irradiating means for irradiating an auxiliary light;
Preliminary photographing means for performing photographing of the subject and second photographing without using the auxiliary light irradiating means; detecting means for detecting a change in luminance between two subject images photographed by the preliminary photographing means; A dividing unit that divides the subject image into a main part region and a background part region based on the luminance change detected by: a ratio in which the area ratio between the main part region and the background part region divided by the dividing unit is given in advance. An electronic camera, comprising: a photographing condition setting unit that sets a focusing distance so as to obtain a focusing condition.