JP2012048166A - Focus adjustment device and focus adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focus adjustment device and a focus adjustment method which enable a photographer to stably adjust a focus on an intended subject.SOLUTION: A face is detected from a moving image, and a main AF area is set in a region of the face when the face is detected and in a predetermined region when the face is not detected. A sub AF area is set in a predetermined region including the main AF area. A fist focus signal of the main AF area and a second focus signal of the sub AF area are calculated to determine an addition rate of the second focus signal with respect to the first focus signal based on a selected AF mode. A third focus signal is generated by combining the first focus signal and the second focus signal to perform focus adjustment control so as to maximize the third focus signal. The AF modes include a first AF mode to focus on the face when the face is detected and on the predetermined region if the face is not detected, and a second AF mode not to perform the focus adjustment control when the face is not detected. The second AF mode has a smaller addition rate than the first AF mode.

Description

  The present invention relates to a focus adjustment device and a focus adjustment method used in an imaging device and the like, and more particularly to a focus adjustment device and a focus adjustment method for performing automatic focus adjustment based on an image obtained by photographing.

  Conventionally, so-called TV-AF type focus adjustment is used in a focus adjustment device such as a video camera. In this TV-AF system, a focus signal representing sharpness is detected from an image signal obtained by photoelectrically converting a subject image with an image sensor, and the focus lens position is controlled so that the focus signal is maximized. Adjust the focus.

  Furthermore, in recent years, a method of detecting a human face from an image obtained by imaging and setting an AF area in an area corresponding to the detected face and performing focus adjustment has been widely used.

  For example, in the focus adjustment described in Patent Document 1, assuming the case of moving image shooting in particular, as shown in FIG. 5, a sub AF area is set on the entire screen, and the focus obtained from the main and sub AF areas. The signals are added at a predetermined ratio and used. By doing in this way, it aims at maintaining the stable focus state.

JP 2009-20190 A

  However, since a human face generally has low contrast and it is difficult to obtain a sufficient focus signal, even if an AF area is set as described in Patent Document 1, it is still influenced by the background contrast component. You may not be able to focus on your face. For example, in the example of FIG. 5, the focus signal is in a state as shown in FIG. 6, so that the focus plane cannot be moved to the main subject A when the background subject B is in focus.

  Furthermore, in the conventional method of setting the AF area in the area corresponding to the face described above, the face area is detected when a face is detected, and the preset fixed area when a face is not detected. Focus adjustment is performed by setting an AF area. For this reason, there are the following problems when editing a shot video.

  In general, when editing a captured video, it is ideal that the video at the editing point has little movement. On the other hand, in the focus adjustment in which the AF area is set in the area corresponding to the face described above, the focus adjustment is performed on the subject when the face is detected. However, the face is detected because the subject is out of the angle of view. When it becomes impossible, the focus adjustment operation is performed on the background. For this reason, when it is desired to edit the subject at a timing when the angle of view has deviated, the focus plane moves, so that it is not possible to obtain an edit point where the image is stationary.

  Therefore, depending on the shooting purpose, if a face is detected, focus adjustment is performed on the subject, and if the face cannot be detected because the subject is out of the angle of view, the convenience of editing is considered. Thus, a focus adjustment method that maintains the focus position can be considered.

  However, if the focus position is held when the face cannot be detected, the intended subject cannot be completely focused when the AF area is set as in Patent Document 1, and the unintended subject is focused. It can be a fatal problem.

  The present invention has been made in view of the above-described problems. In particular, when focus adjustment is performed only under limited conditions, such as when a face is detected, the subject is stable with respect to the subject intended by the photographer. The purpose is to enable focus adjustment.

  In order to achieve the above object, the focus adjustment apparatus of the present invention is preliminarily determined from the moving image based on an imaging unit that captures a moving image and outputs a video signal, and a video signal obtained from the imaging unit. Detecting means for detecting an object having characteristics, selecting means for selecting one of a plurality of focus adjustment modes, and when the object is detected, a first focus detection area is set in the area of the object; When the subject is not detected, a first setting means for setting the first focus detection area in a predetermined area and a second area in the predetermined area including the first focus detection area. A second setting means for setting a focus detection area of the first focus signal, a first focus signal indicating a focus state is calculated based on the video signal of the first focus detection area among the video signals, and the second Based on the video signal in the focus detection area And calculating a second focus signal indicating the focus state and a ratio of the second focus signal to the first focus signal based on the focus adjustment mode selected by the selection means. Determining means; generating means for generating a third focus signal by combining the first focus signal and the second focus signal based on the addition ratio; and the third focus signal being the maximum And a focus adjustment unit that performs focus adjustment control by moving the focus adjustment member such that the plurality of focus adjustment modes focus on the subject when the detection unit detects the subject. A first focus adjustment mode for focusing on a predetermined area of the moving image when it is not detected, and when the subject is detected by the detecting means, the subject is focused and detected. A second focus adjustment mode in which the focus adjustment control by the focus adjustment means is not performed, and the determination means is configured to select the first focus adjustment mode when the second focus adjustment mode is selected. The addition ratio is made lower than when the focus adjustment mode is selected.

  According to the present invention, it is possible to perform stable focus adjustment on a subject intended by a photographer, particularly when focus adjustment is performed only under limited conditions such as when a face is detected.

1 is a block diagram illustrating a configuration of a video camera in an embodiment of the present invention. 5 is a flowchart showing a procedure for generating a focus signal used for a focus adjustment operation in the first embodiment. 9 is a flowchart showing a procedure for generating a focus signal used for a focus adjustment operation in the second embodiment. FIG. 10 is a diagram illustrating an example of a main AF area, a first sub AF area, and a second sub AF area in the second embodiment. The figure which shows an example of AF area when the conventional face is detected. The figure which showed the state of the focus signal in FIG.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a block diagram illustrating a schematic configuration of a video camera as an example of an imaging apparatus according to an embodiment of the present invention. Note that although a video camera is described in this embodiment, the present invention can also be applied to other imaging devices that can capture moving images, such as a microscope and a digital still camera.

  In FIG. 1, 101 is a first fixed lens, 102 is a variable magnification lens that moves in the optical axis direction and performs variable magnification, 103 is a stop, and 104 is a second fixed lens. Reference numeral 105 denotes a focus compensator lens (hereinafter referred to as a “focus lens”) that has both a function of correcting the movement of the focal plane due to zooming and a focusing function (hereinafter referred to as “focus lens”). The first fixed lens 101, the variable magnification lens 102, the diaphragm 103, the second fixed lens 104, and the focus lens 105 constitute an imaging optical system. The moving range of the imaging optical system is determined in advance.

  Reference numeral 106 denotes an image pickup element including a plurality of pixels each having a photoelectric conversion unit, which includes a CCD sensor, a CMOS sensor, or the like. A video signal of a moving image can be obtained by photoelectrically converting the subject image in this pixel and outputting the obtained electrical signal at a constant period. Reference numeral 107 denotes a CDS / AGC / AD converter that samples, gain adjusts, and digitizes the output of the image sensor 106. A camera signal processing circuit 108 performs various image processing on the output signal from the CDS / AGC / AD converter 107 to generate an image signal. Reference numeral 109 denotes a display device that displays an image signal from the camera signal processing circuit 108, and 110 denotes a recording device that records the image signal from the camera signal processing circuit 108 on a recording medium such as a magnetic tape, an optical disk, or a semiconductor memory.

  Reference numeral 111 denotes an AF gate that passes only signals in an area used for focus detection among output signals of all pixels from the CDS / AGC / AD converter 107. Reference numeral 112 denotes a focus by extracting a high frequency component from the signal that has passed through the AF gate 111, a luminance difference component generated from the high frequency signal (difference between the maximum value and the minimum value of the luminance level of the signal that has passed through the AF gate 111), and the like. It is a focus signal processing circuit (calculation means) that generates a signal. Here, the focus signal represents the sharpness (contrast state) of the image generated based on the output signal from the image sensor 106, but the sharpness changes depending on the focus state of the image pickup optical system. Thus, the focus signal represents the focus state of the imaging optical system.

  Reference numeral 113 denotes a face detection processing circuit that performs face detection processing on the image signal and detects subject information (reliability indicating the size, position, and likelihood of the face of the person in the shooting screen). The face detection processing circuit 113 transmits the detection result to a camera / AF microcomputer 114 described later. Based on the detection result, the camera / AF microcomputer 114 transmits information to the AF gate 111 so as to add an area (AF area) used for focus detection to a position including the face area in the shooting screen (first area). Setting means, second setting means, third setting means).

  The face detection process described above is, for example, a method of extracting a skin color region from the gradation color of each pixel represented by image data and detecting a face with a matching degree with a face contour plate prepared in advance, There is a method of performing pattern recognition from extracted facial feature points such as eyes, nose and mouth. In the present invention, any method may be used as long as a face can be detected.

  Reference numeral 114 denotes a camera / AF microcomputer that drives a focus lens 105 by controlling a focus lens driving source 116 described later based on an output signal of the focus signal processing circuit 112 and outputs an image recording command to the recording apparatus 110. . Reference numeral 115 denotes a variable power lens driving source including an actuator for moving the variable power lens 102 and a driver thereof, and reference numeral 116 denotes an actuator for moving the focus lens 105 and a focus lens driving source including the driver thereof. The zoom lens drive source 115 and the focus lens drive source 116 are configured by actuators such as a stepping motor, a DC motor, a vibration motor, and a voice coil motor.

  Reference numeral 117 denotes an AF mode switching unit (selection unit) that enables the photographer to switch between the first AF mode and the second AF mode (a plurality of focus adjustment modes). Here, the first AF mode (first focus adjustment mode) is based on the output result of the face detection processing circuit 113, and when the face is detected, the first AF mode (first focus adjustment mode) is at a position including the face area in the shooting screen. If not, it is a mode in which the AF area is set in a preset fixed area. Further, the second AF mode (second focus adjustment mode) is based on the output result of the face detection processing circuit 113, and when a face is detected, it is set to a position including the face area in the shooting screen. Otherwise, the focus adjustment operation is stopped. In the AF mode switching unit 117, in addition to the first AF mode and the second AF mode described above, for example, regardless of the output result of the face detection processing circuit 113, an AF area is set in a preset fixed area. Other AF modes to be set may be selectable.

  Next, focus adjustment control performed by the camera / AF microcomputer 114 will be described with reference to FIG.

  FIG. 2 is a flowchart showing a procedure of focus adjustment control in the first embodiment. In FIG. 2, in S100, the current AF mode information set by the AF mode switching unit 117 is acquired, and it is determined whether the first or second AF mode is set. If not set, the process proceeds to S103. In S101, information on the result of face detection processing is acquired from the face detection processing circuit 113. In S102, it is determined whether or not a face has been detected from the information acquired in S101, and if not detected, the process proceeds to S103, and if detected, the process proceeds to S104. In S103, the main AF area (first focus detection area) is set at a fixed position that is not based on the face detection result in the center of the imaging screen. In S104, for example, as shown in FIG. 5, the main AF area (first focus detection area) is set in the face position based on the face detection information acquired in S101.

  In S105, a sub AF area (second focus detection area) is set at a fixed position not based on the face detection result in the area including the main AF area set in S103 or S104, for example, as shown in FIG. Note that, by setting the main AF area in S103 or S104 and the sub AF area in S105, the focus signal processing circuit 112 can acquire a focus signal that is the basis of TV-AF control. At this time, a filter coefficient in the focus signal processing circuit 112 is set, and a plurality of band pass filters having different extraction characteristics are constructed. The extraction characteristic is the frequency characteristic of the bandpass filter, and the setting here means changing the setting value of the bandpass filter in the focus signal processing circuit 112.

  In S106, the focus signals of the main AF area set in S103 or S104 and the sub AF area set in S105 are acquired. In the first embodiment, it is assumed that the focus signal in the main AF area set at the face position is stored as a history in a memory or the like. This is so that when the main AF area set at the face position to be controlled changes, when a focus signal is synthesized in S114 described later, the history can be traced and reused.

  In S107, the current AF mode information set by the AF mode switching unit 117 is acquired. In S108, it is determined whether or not the current AF mode acquired in S107 is the first AF mode. If it is the first AF mode, the process proceeds to S109, and if not, the process proceeds to S110. In S109, as the process in the first AF mode, the camera / AF microcomputer 114 (determination means) determines and sets an addition ratio α when the focus signal acquired in S106 is combined in S114 described later. This addition ratio α is obtained by adding the focus signal (second focus signal) obtained from the sub AF area set in S105 to the focus signal (first focus signal) obtained from the main AF area set in S103 or S104. It is a ratio. Here, the addition ratio α is smaller than the addition ratio γ described later in order to make it easier to focus on the main subject by relatively increasing the weight of the focus signal corresponding to the face of a low-contrast person (that is, It is common to set γ> α).

  On the other hand, in S110, it is determined whether or not the current AF mode acquired in S107 is the second AF mode. If it is the second AF mode, the process proceeds to S111, and if not, the process proceeds to S113. In S111, it is determined again whether or not a face has been detected from the information acquired in S101. If it is detected, the process proceeds to S112. If not detected, since AF control is not performed, the process proceeds to S101, and the process here ends. In S112, as processing in the second AF mode, the camera / AF microcomputer 114 (determination means) determines and sets an addition ratio β when the focus signal acquired in S106 is combined in S114 described later. This addition ratio β is an addition ratio of the focus signal (second focus signal) obtained from the sub AF area set in S105 to the focus signal (first focus signal) obtained from the main AF area set in S104. is there. At this time, the addition ratio β is set smaller than the addition ratio α in the first AF mode set in S109 (that is, α> β). Thereby, the weighting of the focus signal corresponding to the face of a person with low contrast becomes relatively large, and the main subject can be easily focused as compared with the conventional method. Note that, by setting the addition ratio β here to 0, the focus signal obtained from the sub AF area set in S105 may not be used in the second AF mode.

  In S113, as a process other than in the first and second AF modes, an addition ratio γ is set when the focus signal acquired in S106 is combined in S114 described later. This addition ratio γ is an addition ratio of the focus signal (second focus signal) obtained from the sub AF area set in S105 to the focus signal (first focus signal) obtained from the main AF area set in S103. is there.

  In S114, the focus signal acquired in S106 is synthesized based on the addition ratio set in S109, S112, or S113. In S115, TV-AF focus adjustment is performed based on the focus signal (third focus signal) synthesized in S114, and the process returns to S101. In addition, as a TV-AF system focus adjustment using a focus signal, for example, a known method such as a method described in JP2010-156850A can be used, and thus detailed description is omitted here. To do.

  As described above, according to the first embodiment, when the second AF mode is set, from the main AF area set at the face position, compared to when the first AF mode is set. Increase the focus signal addition ratio. As described above, the addition ratio of the focus signal obtained from the main AF area and the sub AF area is changed according to the set AF mode. This makes it possible to perform stable focus adjustment on the subject intended by the photographer, particularly when focus adjustment is performed only under limited conditions, such as when a face is detected.

  Information (for example, a frame surrounding the main AF area) indicating which face area is being operated according to the information on which face area may be displayed on the display device 109.

  In the first embodiment, the main AF area is a face area detected in the imaging screen (when a face is detected). In addition to the face, a specific subject is detected by image detection. It doesn't matter. For example, it may be possible to cut out and detect a subject image from the background. In addition, the position in the imaging screen may be determined by inputting the position in the imaging screen from an external input means or by detecting the line of sight of the photographer who is looking at the viewfinder.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. The configuration of the image sensor in the second embodiment is the same as that described in the first embodiment with reference to FIG. In the second embodiment, two sub AF areas are set. Unlike the first embodiment described above, the focus adjustment control shown in FIG. 3 is replaced with the focus adjustment control described with reference to FIG. Done. In the first embodiment described above, the sub AF area is arranged only at a fixed position that is not based on the face detection result in order to obtain the effect with the minimum necessary configuration. On the other hand, in the second embodiment, the second sub AF area is arranged at the center of gravity of the main AF area in order to make the focus follow the subject more reliably. Hereinafter, the procedure of the focus adjustment control in the second embodiment will be described with reference to the flowchart of FIG.

  In FIG. 3, in S200, the current AF mode information set in the AF mode switching unit 117 is acquired, and it is determined whether the first or second AF mode is set. If not set, the process proceeds to S203. In step S <b> 201, face detection processing result information is acquired from the face detection processing circuit 113. In S202, it is determined whether or not a face has been detected from the information acquired in S201. If not detected, the process proceeds to S203, and if detected, the process proceeds to S204. In S203, the main AF area (first focus detection area) is set at a fixed position that is not based on the face detection result in the center of the imaging screen. In S204, for example, as shown in FIG. 4, the main AF area (first focus detection area) is set in the face position based on the face detection information acquired in S201.

  In S205, the first sub AF area (second focus detection area) is set at a fixed position not based on the face detection result in the area including the main AF area set in S203 or S204, for example, as shown in FIG. Set. Furthermore, in the second embodiment, in S206, the second sub-AF area (third focus detection area) as shown in FIG. 4, for example, in the area of the center of gravity of the main AF area set in S203 or S204. Set. It should be noted that the main AF area is set in S203 or S204, and the first and second sub AF areas are set in S205 and S206, so that the focus signal that is the basis of TV-AF control is obtained in the focus signal processing circuit 112. It can be acquired. At this time, a filter coefficient in the focus signal processing circuit 112 is set, and a plurality of band pass filters having different extraction characteristics are constructed.

  In S207, focus signals of the main AF area set in S203 or S204 and the first sub AF area and the second sub AF area set in S205 and S206 are acquired. In the second embodiment, as in the first embodiment described above, it is assumed that the focus signal in the main AF area set to the face position is stored as a history in a memory or the like.

In S208, the current AF mode information set by the AF mode switching unit 117 is acquired. In S209, it is determined whether or not the current AF mode acquired in S208 is the first AF mode. If it is the first AF mode, the process proceeds to S210, and if not, the process proceeds to S211. In S210, as processing in the first AF mode, the camera / AF microcomputer 114 (determination unit) determines addition ratios α ₁ and α ₂ when the focus signal acquired in S207 is combined in S215 described later, Set. Here, the addition ratio α ₁ is the focus signal (second focus) obtained from the first sub AF area set in S205 with respect to the focus signal (first focus signal) obtained from the main AF area set in S203 or S204. Of the focus signal). The addition ratio alpha _2, like S203 or to the focal signal obtained from the main AF area set in S204 (first focus signal), focus signal obtained from the second sub-AF area set in S206 (4th Of the focus signal). Here, in order to make it easier to focus on the main subject by relatively increasing the weight of the focus signal corresponding to the face of a person with low contrast, α ₁ is smaller than the addition ratios γ ₁ and γ ₂ described later ( That is, γ ₁ > α ₁ ) and α ₂ are generally set large (γ ₂ <α ₂ ).

On the other hand, in S211, it is determined whether or not the current AF mode acquired in S208 is the second AF mode. If it is the second AF mode, the process proceeds to S212, and if not, the process proceeds to S214. In S212, it is determined again whether or not a face has been detected from the information acquired in S201, and if it is detected, the process proceeds to S213. If not detected, since AF control is not performed, the process proceeds to S201, and the process here is terminated. In S213, as processing in the second AF mode, the camera / AF microcomputer 114 (determination means) determines addition ratios β ₁ and β ₂ when the focus signal acquired in S207 is combined in S215 described later, Set. Here, addition ratio beta ₁ is for focus signal obtained from the main AF area set in S204 (first focus signal), a first focus signal obtained from the sub-AF area (the second focal point of the set in S205 Signal). Also, the addition ratio β ₂ is the focus signal (fourth focus) obtained from the second sub AF area set in S206 with respect to the focus signal (first focus signal) obtained from the main AF area set in S204. Signal). At this time, the addition ratio β ₁ is set smaller than the addition ratio α ₁ in the first AF mode set in S210 (that is, α ₁ > β ₁ ), and the addition ratio β ₂ is set in S210. Is set larger than the addition ratio α ₂ in the first AF mode (that is, α ₂ <β ₂ ). As a result, the weighting of the focus signal corresponding to the face of a person with low contrast becomes relatively larger, and the main subject is more easily focused as compared with the conventional method. Note as in the first embodiment, by the addition ratio beta ₁ 0 Here, the second AF mode as shall not use focus signal obtained from the first sub-AF area set in S205 I do not care.

In S214, as processings other than those in the first and second AF modes, addition ratios γ ₁ and γ ₂ when the focus signal acquired in S207 is combined in S215 described later are set. Here, the addition ratio γ ₁ is the focus signal (second focus) obtained from the first sub AF area set in S205 with respect to the focus signal (first focus signal) obtained from the main AF area set in S203. Signal). Also, the addition ratio γ ₂ is the focus signal (fourth focus) obtained from the second sub AF area set in S206 with respect to the focus signal (first focus signal) obtained from the main AF area set in S203. Signal).

  In S215, the focus signal acquired in S207 is synthesized based on the addition ratio set in S210, S213, or S214. In S216, based on the focus signal (third focus signal) synthesized in S215, the TV-AF focus adjustment is performed in the same manner as in the first embodiment, and the process returns to S201.

  As described above, according to the second embodiment, compared with the first embodiment described above, the weighting of the focus signal corresponding to the face of a person with low contrast is relatively larger, and the conventional method is used. Compared to the main subject, it is easier to focus.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (7)

Imaging means for shooting a video and outputting a video signal;
Detecting means for detecting a subject having a predetermined characteristic from the moving image based on a video signal obtained from the imaging means;
Selecting means for selecting one of a plurality of focus adjustment modes;
When the subject is detected, a first focus detection region is set in the subject region, and when the subject is not detected, the first focus detection region is set in a predetermined region. First setting means;
Second setting means for setting a second focus detection area in a predetermined area including the first focus detection area;
A first focus signal indicating a focus state is calculated based on the video signal in the first focus detection area, and a focus state is indicated based on the video signal in the second focus detection area. Calculating means for calculating the focus signal of 2;
Determining means for determining an addition ratio of the second focus signal to the first focus signal based on the focus adjustment mode selected by the selection means;
Generating means for combining the first focus signal and the second focus signal based on the addition ratio to generate a third focus signal;
Focus adjustment means for performing focus adjustment control by moving a focus adjustment member so that the third focus signal is maximized,
The plurality of focus adjustment modes include a first focus adjustment that focuses on the subject when the detection unit detects the subject and focuses on a predetermined area of the moving image when the detection unit does not detect the subject. And a second focus adjustment mode in which when the subject is detected by the detection means, the subject is focused, and when the subject is not detected, the focus adjustment control by the focus adjustment means is not performed. The determination means lowers the addition ratio when the second focus adjustment mode is selected than when the first focus adjustment mode is selected. apparatus.   2. The focus adjustment apparatus according to claim 1, wherein when the second focus adjustment mode is selected by the selection unit, the determination unit sets the addition ratio to 0. 3. A third setting means for setting a third focus detection area including the first focus detection area in the center;
The calculation means further calculates a fourth focus signal indicating a focus state based on the video signal of the third focus detection area, among the video signals, and the determination means further includes the first focus signal. The addition ratio of the fourth focus signal to the focus signal is determined, and the addition ratio is greater than that in the case where the first focus adjustment mode is selected when the second focus adjustment mode is selected. The focus adjustment apparatus according to claim 1, wherein the focus adjustment apparatus is also made higher.   The focus detection apparatus according to claim 1, wherein the predetermined subject is a human face. An imaging process of shooting a video and outputting a video signal;
A detection step of detecting a subject having a predetermined characteristic from the moving image based on the video signal obtained in the imaging step;
A selection step of selecting one of a plurality of focus adjustment modes;
When the subject is detected, a first focus detection region is set in the subject region, and when the subject is not detected, the first focus detection region is set in a predetermined region. A first setting step;
A second setting step of setting a second focus detection area in a predetermined area including the first focus detection area;
A first focus signal indicating a focus state is calculated based on the video signal in the first focus detection area, and a focus state is indicated based on the video signal in the second focus detection area. A calculation step of calculating a focus signal of 2;
A determination step of determining an addition ratio of the second focus signal to the first focus signal based on the focus adjustment mode selected in the selection step;
Generating a third focus signal by combining the first focus signal and the second focus signal based on the addition ratio;
A focus adjustment step of performing focus adjustment control by moving the focus adjustment member so that the third focus signal is maximized,
The plurality of focus adjustment modes include a first focus adjustment that focuses on the subject when the subject is detected in the detection step and focuses on a predetermined region of the moving image when the subject is not detected. And a second focus adjustment mode in which the focus is adjusted when the subject is detected in the detection step, and the focus adjustment control is not performed by the focus adjustment step when the subject is not detected. In the determination step, when the second focus adjustment mode is selected, the addition ratio is made lower than when the first focus adjustment mode is selected. Method.   The program for making a computer perform each process of the focus adjustment method of Claim 5.   A computer-readable storage medium storing the program according to claim 6.

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