JP4701122B2 - camera - Google Patents

Description

  The present invention relates to an improvement of a digital camera, and more particularly to a camera that improves the performance of a camera according to determination of a subject image and enables photography without failure.

A technique for detecting a face desired by a user from an image is widely known. For example, in the following Patent Document 1, a proposal is made to switch the volume level by determining the distance between the subject and the device using the size of the face. Cameras that control the focus and exposure of the face position are also on the market.
JP 2004-40491 A

  By the way, as described above, a camera that controls focusing and exposure with respect to the position of the face is also on sale, but the technique described in Patent Document 1 analyzes a shooting scene by face, and as a result, It wasn't like optimal camera control.

  Accordingly, the present invention has been made in view of the above-described problems, and its purpose is to determine a person to be a subject and perform optimal shooting control without missing a photo opportunity, and to optimize the depiction of a face to be a beautiful photograph It is to provide a camera that can be obtained.

That is, according to the first aspect of the present invention, in a camera having an auxiliary light source that emits auxiliary light, an imaging unit that obtains an image by imaging, and an image obtained by the imaging unit before imaging by the imaging unit are included. obtained a face detection unit for detecting whether a face is included image, and a control unit for controlling the light emission amount at the time of preliminary light emission of the auxiliary light source prior to the time of the upper Symbol shooting by the imaging section as a result of the preliminary light emission of the auxiliary light source A brightness detection unit that detects a contrast change between a bright part and a dark part of the face image in the received image, and the control unit is configured to respond to the magnitude of the contrast change detected by the brightness detection unit. And controlling the light emission amount of the auxiliary light source during photographing by the imaging unit .

According to a second aspect of the present invention, in the first aspect of the invention, the control unit controls a light emission amount of the auxiliary light source during the photographing when the contrast change is large, and the contrast change is If it is small, the auxiliary light source is not caused to emit light during the photographing .

According to a third aspect of the present invention, in the first aspect of the present invention, the compression ratio switching unit that switches a compression ratio of an image obtained by photographing by the imaging unit, and the face image corresponds to a main subject. A main subject determination unit that determines whether the main subject is a moving subject, and a moving body determination unit that determines whether the main subject is a moving object when the face image is determined to be a main subject. Is characterized in that, when the face image is determined as a main subject, the compression rate is switched according to the determination result of the moving object determination unit .

  According to the present invention, it is possible to provide a camera capable of obtaining a beautiful photograph by determining the person of the subject and performing optimal shooting control without missing a photo opportunity and optimizing the depiction of the face.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a basic configuration of a camera according to an embodiment of the present invention. This camera includes a main CPU (hereinafter referred to as MPU) 11, a plurality of switches 11a, 11b, and 11c, a signal processing unit 12, a face detection unit 13, a flash ROM 15, an auxiliary light irradiation unit 16, and a focus. Alignment unit 18, zoom control unit 19, analog front end unit (AFE) 21, SDRAM 22, memory 23, microphone 24, speaker 26, display unit 27, print signal output unit 28, and wireless communication The unit 29 includes an image sensor 31 and a photographing lens 32.

  In FIG. 1, the MPU 11 has functions such as control means, face determination means, face change determination means, calculation means, auxiliary light control means, light amount determination means, shadow determination means, switching means, and focusing condition switching means. . The MPU 11 is composed of a microcontroller or the like, and detects various operations by the user based on the states of the switches 11a, 11b, and 11c. Further, the MPU 11 sequentially controls each block to be described later according to the detection results of the switches 11a, 11b, and 11c and the program stored in the flash ROM 15, and executes a shooting and playback sequence. The switches 11a to 11c have functions of a power switch (11a) for turning the power on and off, a release switch (11b), and shooting and playback and other switches (11c) described later. An operation is input.

  Connected to the MPU 11 are a signal processing unit 12 having a function such as signal compression, a face detection unit 13, a flash ROM 15, an auxiliary light irradiation unit 16, a focusing unit 18 and a zoom control unit 19. . The signal processing unit 12 performs processing such as color correction and signal compression. The signal processing unit 12 includes an auxiliary block 12a as a switching unit for changing the sensitivity after changing the exposure level, how to apply the correction at the time of image processing, or changing the compression rate. Have.

  The face detection unit 13 analyzes the image signal obtained from the image sensor 31 and uses the features of the human face to detect whether there is a person in the subject and determine the position and size of the face. This is a face detection means.

  The flash ROM 15 stores various programs executed by the MPU 11 of the camera and various adjustment values related to the camera. The auxiliary light irradiating unit 16 irradiates auxiliary light toward the subject 34 to supplement exposure or capture shadows. Further, the focusing unit 18 is used to control the photographing lens 32 in order to focus the subject 34 on the imaging surface of the image sensor 31 via the photographing lens 32 assumed to be an AF zoom lens or the like. It is a matching condition switching means. The zoom control unit 19 is a control unit for switching the angle of view by the photographing lens 32.

  The signal processing unit 12 further includes an analog front end unit 21, an SDRAM 22, a memory 23, a microphone 24, a speaker 26, a display unit 27, a print signal output unit 28, and a wireless communication unit 29. It is connected. The analog front end unit 21 is connected to an image sensor 31 that is an image pickup unit that forms an image of the subject 34 incident from the shooting lens 32 during shooting. The image sensor 31 is constituted by a CCD, a CMOS sensor, or the like, and photoelectrically converts the subject image into an image signal.

  The analog front end unit 21 reads the image signal converted by the image sensor 31 and performs A / D conversion. The analog front end unit 21 also performs control such as switching the exposure level of the input image. The digital image signal converted by the analog front end unit 21 is input to the signal processing unit 12. The signal processing unit 12 performs various image processes to generate image data. The image data is recorded in a removable memory 23. Here, the image data recorded in the memory 23 is compressed and recorded in an appropriate amount of data according to the camera settings. At this time, data is appropriately stored in the SDRAM 22 in order to perform various operations. In the present invention, the moving image is also first stored here.

  The display unit 21 that constitutes the classification display unit together with the MPU is composed of an LCD or the like. The composition is determined by confirming the state of the subject 34 by sequentially reproducing and displaying signals from the image sensor 31 by the display unit 27. Reproduction display is performed by reading the compressed image data in the memory 23 into the signal processing unit 12, converting it into display data, and displaying it on the display unit 27 in accordance with the user's operation of the switch 11 c. Similarly, in the audio reproduction, the compressed audio data in the memory 23 is read out to the signal processing unit 12 and converted into audio data according to the operation of the switch 11c, and is output from the speaker 26. The memory 23 may be either a built-in one or a removable one like a card.

  The captured image or the like can be transmitted to an external device (not shown) via the print signal output unit 28 and the wireless communication unit 29.

  In such a configuration, when the user operates the switches 11a to 11c, the state is detected by the MPU 11, and each block is sequentially controlled in accordance with the program stored in the flash ROM 15, and the sequence of shooting and reproduction is performed. Is executed.

  At the time of shooting, an image of the subject 34 incident from the shooting lens 32 is captured by the image sensor 31 and converted into an electrical signal, and a digital image signal is input to the signal processing unit 12 via the analog front end unit 21. When the signal processing unit 12 performs processing such as color correction and image compression, the resulting data is recorded in the memory 23 and the shooting is finished.

  Next, with reference to the flowchart of FIG. 2, the operation at the time of shooting of the camera having such a configuration will be described. The operation of this camera is mainly performed by the control of the MPU 11.

  When this sequence is started, first, in step S1, since the photographing sequence is executed, it is determined whether or not the release switch 11b or the like has been operated by the user. Here, before entering the shooting sequence, the process proceeds to steps S18 and S19, and the display unit 27 including an LCD or the like provided on the back of the camera is connected to the image sensor so that the shooting range can be confirmed by the user. The signal from 31 is read out at high speed and the imaging result is displayed. In this case, since real-time characteristics are required, only data with a sufficient number of pixels for display is processed, and responsiveness is improved (at the time of shooting, a larger number of pixels are used to improve image quality). ) In step S20, the subject image is analyzed.

  In step S21, the face detection unit 13 uses the image obtained in step S20 to determine whether a face exists in the image of the subject. If a face is not detected, the process proceeds to step S1. If a face is detected, the process proceeds to step S22. Since this face detection processing operation is a well-known technique, a description thereof will be omitted.

In step S22, the position of the face detected in step S21 on the image sensor 31 is detected. Similarly, in step S23, the face size (W) is detected on the image sensor 31. (See FIG. 3). Further, in step S24, the zoom position f _T of the photographing lens 32 at that time is obtained, and the subject distance L ₀ is calculated from the above W and f _{T according} to the following equation (1).

L ₀ = f _T (W _f / W) (1)
Further, the relationship between the angle of view (θ) and the zoom position f _T (focal length) is expressed as in the following equations (2) and (3).
θ = arctan (W ₀ / f _T ) (2)
f _T = (W ₀ / tan θ) (3)
This is an approximate value that can be obtained because the width W _f of a human face is generally a few tens of centimeters. Therefore, at step S25, the above (1) to (3), the object distance L ₀ is estimated.

Further, since the position of the face of the subject is known, assuming that the brightness of that portion is B ₁ , the brightness B ₁ of the face portion of the subject is detected from the output of the image sensor 31 in step S26. Can do. Further, the brightness of the other part (background) can also be detected as B ₂ at the same time in step S27. By examining this difference, it is possible to determine whether or not the backlight is backlit.

  In the case of backlighting, it is possible to bring the background and the brightness of the person close to each other and achieve appropriate exposure by flashing light by flashing a xenon (Xe) tube (not shown) or irradiating white LED light from the camera side. . In such a scene, it is preferable to perform irradiation of these auxiliary lights. Irradiation of auxiliary light has a favorable effect even in a dark scene such as a room or a night view, even if it is not backlit. Therefore, even if it is determined that the situation is under such a situation, the subroutine “auxiliary light emission determination” is executed in step S28 and it is determined that auxiliary light emission by the auxiliary light irradiation unit 16 is performed. . The detailed operation of this subroutine “determination of auxiliary light emission” will be described later.

  Next, in step S29, it is determined whether or not the face portion is moving based on the detected change in the face position. If the face is moving even though the background has not changed, it can be seen that the subject is a moving object. Therefore, if it is determined in step S29 that the face portion is moving, the process proceeds to step S30 and the subject is determined to be a moving object. Otherwise, step S30 is skipped and the process proceeds to step S1. To do. Thus, steps S1 and S18 to S30 described above are repeated. That is, face determination or the like is performed during such display control.

  When a photographing operation is performed in step S1, it is determined in subsequent step S2 whether or not the subject has a face. The determination of the presence / absence of the face is performed by a well-known technique in the same manner as the face detection in step S21 described above, and thus the description thereof is omitted here. If it is determined in step S2 that no face is present, the routine proceeds to normal shooting control. Since this normal photographing control is well known, the description thereof is omitted here. On the other hand, when it is determined in step S2 that a face exists, the process proceeds to step S3.

In step S3, it is determined whether or not the subject is a moving object. When the subject is a moving object, if the subject is not immediately taken, there is a possibility that the subject will go away somewhere and miss a photo opportunity. Accordingly, the object in step S3 is if it is determined that the moving object, the process proceeds to step S9, to focus on the object distance L ₀ obtained in step S25 is performed. Then, at step S10, adequate light emission amount determined by the F number value indicating the brightness of the distance L ₀ and the lens is determined. Then, in the subsequent step S11, the subroutine “auxiliary light emission and exposure” is executed so that the subject is irradiated with the auxiliary light and photographing (exposure) is performed.

  Next, after a subroutine “main subject detection”, which will be described in detail later, is executed in step S12, it is determined in step S13 whether or not the face is the main subject. If the face is the main subject, the process proceeds to step S14. Otherwise, the process proceeds to step S15. In step S14, it is determined whether or not the subject is a moving object. If it is a moving object, the process proceeds to step S15, and if not, the process proceeds to step S16.

  In the case of a shooting situation such as the transition to step S15, the shot image tends to be disturbed, so that even if compression is applied during recording, the image deterioration is relatively inconspicuous. Therefore, after the compression rate is increased in step S15, recording is performed in step S17. As a result, the amount (number of images) that can be shot can be increased even with the same size of the memory 23. On the other hand, step S16 will be described later.

  Since it is difficult to capture a photo opportunity for a moving object, it is preferable to be able to take a number of images.

On the other hand, if the moving object is not determined in step S3, the process proceeds to step S4, and hill-climbing AF is performed on the subject 34. In this method, the peak position of the contrast of the image signal obtained while switching the focus position of the photographic lens 32 is determined as the best focus position. In this method, it is necessary to control the lens at several focal positions, but the shooting time lag cannot be shortened unless the time at that time is shortened. Therefore, in this embodiment, this lens control position is narrowed down to the vicinity of the position (L ₀ ) obtained by the above equation (1) in step S25, thereby enabling high-speed focusing.

  Next, in step S5, auxiliary light is pre-lighted prior to photographing. In step S6, the shadow state of the face portion is determined as shown in FIG. 4 by the auxiliary light pre-emission in step S5. Here, if there is a direction in which the shadow of the face portion disappears when the auxiliary light is irradiated, the process proceeds to step S11, and photographing for removing the shadow by the auxiliary light is performed.

For example, under intense sunlight as shown in FIG. 5, shadows on the face can be easily formed with tree shadows, hats, hair, etc., as indicated by hatching in FIG. In this state, no light is applied to the shadow portion and light is applied to the other portion, so that a large contrast of light and darkness (ΔB _B ) occurs as in the logarithmic luminance distribution shown in FIG. . On the other hand, when auxiliary light such as flash light is irradiated, as shown in FIG. 4B, the contrast (ΔB _A ) expressed by the logarithmic luminance distribution reaches the sunlight in the bright part. Since there is no change, the luminance is greatly changed by supplementing light in the dark portion (for example, when 10 auxiliary light is irradiated on the contrast portion of 1: 100, the ratio becomes 10: 110, Is about 1/10). Therefore, for a subject having such a change in the face detected portion, shooting with the face shadow removed is performed in step S11.

  On the other hand, if it is determined in step S6 that there is no effect of removing the above-described shadow, the process proceeds to step S7, and it is determined whether or not auxiliary light emission determination is made in step S28. If the auxiliary light emission is determined, the process proceeds to step S11. If the auxiliary light emission is not performed, the process proceeds to step S8. In other words, when there is no effect to erase the shadow and the auxiliary light emission has not been determined, in order to save the energy of the auxiliary light, in order not to cause side effects caused by illuminating the subject with artificial light, step S7. Shooting without auxiliary light irradiation is performed.

  Next, in step S12, a “main subject detection” subroutine is executed. The detailed operation of this subroutine “main subject detection” will be described later.

  In step S8, when the image is shot without auxiliary light emission, the process proceeds to step S16 through steps S13 and S14 after step S12 so as not to increase the compression rate. That is, the compression ratio at the time of recording is suppressed so that the delicate shadow, texture and color of the face are not dropped. Then, it is recorded in step S17.

  However, as described above, if the object is a moving object in step S14, the image may be disturbed more than that, so that the user may not be concerned about the difference in color and shadow except for the face. There are many. Therefore, priority is given to the number of images that can be shot, and recording is performed at a higher compression rate in steps S15 and S17.

  Next, a detailed operation of the subroutine “auxiliary light emission and exposure” in step S11 in the flowchart of FIG. 2 described above will be described with reference to the flowchart of FIG.

Once in this routine, first, in step S41, when pre-emission brightness B ₃ which light was also included in the auxiliary light reflected from the portion of the face of the subject is detected. Then, in step S42, the brightness B ₃ which is detected in step S41, and the brightness B ₂ of the detected background in step S28 in the flowchart of FIG. 2 are compared.

Here, if B ₃ from which the auxiliary light is emitted is darker than B ₂ , the backlight condition is reached. Therefore, the process proceeds to step S43, and an exposure condition for making the intermediate brightness appropriate is determined. As shown in FIG. 7A, the background brightness and the brightness of the face of the subject to which the auxiliary light is emitted will be described with the screen position on the horizontal axis and the brightness on the vertical axis. In this case, since B ₃ is darker than B ₂ , if the exposure time is increased and B ₃ is made appropriate, the background becomes pure white and it becomes difficult to know what kind of scene it is. On the other hand, if B ₂ is set appropriately, the face portion becomes black and the human facial expression is not understood.

Therefore, as shown in FIG. 7B, an exposure time and a lens aperture value are selected such that the brightness of B ₂ and B ₃ can be both changed. Here, the charge accumulation amount of the image sensor 31 is set to a predetermined value by controlling the exposure time so as to obtain an appropriate charge amount with respect to the average value of the brightness B ₂ and B ₃ . Under the exposure conditions determined as described above, the shutter is controlled while the auxiliary light is irradiated in step S46.

  In step S42, if the backlight is not backlit, the process proceeds to step S44 to devise so that the background color does not become black. That is, as shown in FIG. 8 (a), when only the face of a nearby subject is exposed under appropriate conditions, the light does not reach the background, so the image becomes unclear and boring. End up. In this case, in step S45, as shown in FIG. 8B, the time during which the shutter is open (exposure time) is extended so that the contrast of the background image can be depicted. In step S45, the amount of light emission is set so that the face portion is properly exposed under the conditions. As a result, in step S46, the face portion is irradiated, and the background can be drawn so that a photograph with an atmosphere can be taken.

  Thereafter, the present subroutine is exited, and the process proceeds to step S12 in the flowchart of FIG.

FIG. 9 is a flowchart for explaining the detailed operation of the subroutine “auxiliary light emission determination” in step S28 in the flowchart of FIG. In this subroutine, processing is performed using the brightness B ₁ of the face portion and the brightness B ₂ of the portion other than the face.

When this routine is entered, first in step S51, the brightness B ₁ of the face portion detected in steps 26 and S27 in the flowchart of FIG. 2 and the brightness other than the face, that is, the background brightness B ₂ are detected. Are compared. When the face portion is much darker than the background, it is considered that the scene is a backlight scene, so it is necessary to supplement the light from the camera side with auxiliary light emission. Therefore, in step S54, light emission by the auxiliary light irradiation unit 16 is determined.

In step S51, the background brightness B ₂ is compared with a predetermined brightness B ₀ . If the scene has a background brightness B ₂ that is darker than the predetermined brightness B ₀ , the process proceeds to step S54 where light emission control is performed. On the other hand, if the background brightness B ₂ is not darker than the predetermined brightness B ₀ in step S52, the process proceeds to step S53 where it is determined that control without auxiliary light emission is performed. Energy consumption due to light irradiation is suppressed.

  Thereafter, the present subroutine is exited and the process proceeds to step S29 in the flowchart of FIG.

  FIG. 10 is a flowchart for explaining the detailed operation of the subroutine “main subject detection” in step S12 in the flowchart of FIG.

  For example, as shown in FIG. 11 (a), when a large face appears in the screen, it can be determined that the subject is the main subject even if the position is at the corner. On the other hand, as shown in FIG. 11B, even if the size of the face is small, an object close to the center of the screen can be considered as the main subject. Therefore, in the flowchart of FIG. 10, first, in steps S61 and S62, the ratio of the area occupied by the face in the screen is determined.

  That is, in step S61, it is determined whether the ratio of the area occupied by the face in the screen is 1/10 or more. Here, if the ratio of the area occupied by the face in the screen occupies a size of 1/10 or more, the process proceeds to step S67 and the face is set as the main subject. On the other hand, if the ratio of the area occupied by the face in the screen is less than 1/10 in step S61, the process proceeds to step S62, and the ratio of the area occupied by the face in the screen is 1/20 or less. It is determined whether or not there is. Here, if the ratio of the area occupied by the face in the screen is 1/20 or less in step S62, the process proceeds to step S63, and if the area is less than that in step S62, the process proceeds to step S65.

  Then, in step S63, it is determined whether or not the ratio of the area occupied by the face in the screen is 1/50 or less. Here, when the ratio of the area occupied by the face in the screen is 1/50 or less, the process proceeds to step S66, and the area other than the face is set as the main subject. On the other hand, if the ratio of the area occupied by the face in the screen exceeds 1/50 in step S63, the process proceeds to step S64.

  In step S64, it is determined whether or not the subject's face is in the center 1/3 of the screen. If the face is in the center 1/3 of the screen, the process proceeds to step S67. If not, the process proceeds to step S66. In step S65, the position of the face is determined on the screen. In this step S65, as shown in FIG. 11B, it is determined whether or not a face is in 3/4 of the center of the screen. As a result, if the face is in 3/4 of the center of the screen, the process proceeds to step S67, and if not, the process proceeds to step S66.

  In step S66, it is determined that a part other than the face is the main subject, and in step S67, the face is the main subject. Thereafter, the process exits from this routine and proceeds to step S13 in the flowchart of FIG.

  That is, if the ratio of the area occupied by the face in the screen is 1/10 or more, the face is detected as the main subject. Also, even if the ratio of the area occupied by the face in the screen is less than 1/10, but larger than 1/20, if the face position is within 3/4 of the center of the screen, the face is the main subject. Detected. Further, when the ratio of the area occupied by the face in the screen is 1/20 or less, the face is detected as the main subject if the face position falls within 1/3 of the center of the screen. If none of the above applies, it is detected that the subject other than the face is the main subject.

  In this way, since the image processing is changed by determining whether the face is the main subject or not based on the ratio and position in the screen, the skin of a person who is said to account for 80% of the subject photographed by a general user A camera that can optimally reproduce the color and texture of the camera can be provided, and high satisfaction can be obtained from the user. It is also effective to perform face processing and color processing that is faithful to the skin color.

  As described above, according to the present embodiment, it is possible to determine a scene using the face of a subject and perform appropriate shooting.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  Further, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

It is a block diagram which shows the basic composition of the camera which concerns on one Embodiment of this invention. 4 is a flowchart for explaining a photographing operation of a camera in an embodiment of the present invention. It is the figure which showed the relationship between the zoom position of an imaging lens, a to-be-photographed object distance, and the size of the face of a to-be-photographed object. It is the figure which showed the example of the luminance distribution of the to-be-photographed object. It is a figure for demonstrating the shadow of a to-be-photographed object. It is a flowchart explaining the detailed operation | movement of the subroutine "auxiliary light emission and exposure" of step S11 in the flowchart of FIG. It is a figure explaining the brightness of the face of the to-be-photographed object to which the brightness of the background and auxiliary light were emitted. It is a figure explaining the brightness of the face of the to-be-photographed object to which the brightness of the background and auxiliary light were emitted. 3 is a flowchart for explaining detailed operations of a subroutine “auxiliary light emission determination” in step S28 in the flowchart of FIG. 2. 3 is a flowchart for explaining detailed operations of a subroutine “main subject detection” in step S12 in the flowchart of FIG. 2. It is a figure for demonstrating the relationship between a screen and the magnitude | size of a to-be-photographed object's face.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Main CPU (MPU), 11a, 11b, 11c ... Switch, 12 ... Signal processing part, 13 ... Face detection part, 15 ... Flash ROM, 16 ... Auxiliary light irradiation part, 18 ... Focusing part, 19 ... Zoom control , 21 ... Analog front end (AFE), 22 ... SDRAM, 23 ... Memory, 24 ... Microphone, 26 ... Speaker, 27 ... Display part, 28 ... Print signal output part, 29 ... Wireless communication part, 31 ... Image sensor 32 ... photographic lens, 34 ... subject.

Claims (3)

In a camera having an auxiliary light source that emits auxiliary light,
An imaging unit for obtaining an image by imaging;
A face detection unit that detects whether a face image is included in an image obtained by the imaging unit before shooting by the imaging unit ;
A control unit for controlling the light emission amount at the time of preliminary light emission of the auxiliary light source prior to the time of the upper Symbol shooting,
A brightness detection unit for detecting a contrast change between a bright part and a dark part of a face image in the image obtained by the imaging unit as a result of the pre-light emission of the auxiliary light source;
Comprising
The camera , wherein the control unit controls a light emission amount of the auxiliary light source at the time of photographing by the imaging unit in accordance with a magnitude of a contrast change detected by the brightness detection unit . The control unit controls a light emission amount of the auxiliary light source at the time of photographing when the contrast change is large, and does not cause the auxiliary light source to emit light at the time of photographing when the contrast change is small. 1. The camera according to 1. A compression rate switching unit that switches a compression rate of an image obtained by photographing by the imaging unit;
A main subject determination unit for determining whether the face image corresponds to a main subject;
A moving body determination unit that determines whether or not the main subject is a moving body when the face image is determined to be a main subject;
Further comprising
The camera according to claim 1, wherein the compression rate switching unit switches the compression rate according to a determination result of the moving object determination unit when the face image is determined to be a main subject.

Images