JP2014016534A - Imaging device and focus adjustment method of imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device capable of focusing on a main subject when performing panning, and a focus adjustment method of an imaging device.SOLUTION: A focus adjustment method of an imaging device comprises the steps of: calculating a spatial frequency related to a direction of movement (swing direction) of an image in an imaging screen for each of predetermined areas (S5); performing weighting of priority according to the calculated spatial frequency for each of the predetermined areas (S7); detecting a change in contrast between a plurality of image signals acquired in different times for each of the predetermined areas (S9); performing weighting of priority according to the calculated contrast change amount for each of the predetermined areas (S11); setting a predetermined area having higher weighted priority as an AF area (S19); and performing AF (S23).

Description

  The present invention relates to an image pickup apparatus including a focus adjustment unit that performs a focus adjustment operation, and a focus adjustment method for the image pickup apparatus.

  A shooting method called panning is known in which a moving subject is shot while moving the camera in the same direction as the moving direction of the subject. In Patent Document 1, when it is detected that the optical apparatus is currently being used while moving, that is, when it is detected that panning is being performed, a plurality of panning speeds, directions, or focal lengths of the optical system are detected. It is disclosed that a focus detection area is weighted and focus adjustment is performed based on focus detection information of a focus detection area selected based on the weight.

JP 11-271598 A

  In the optical device disclosed in Patent Document 1 described above, weighting is performed so that the central focus detection region can be easily detected. Therefore, when the main subject is not located at the center, the focus at which the miscellaneous subject that is not the main subject is located. A detection area may be selected. For this reason, there is a possibility that the main subject cannot be focused during panning.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an imaging apparatus capable of focusing on a main subject and a focus adjustment method of the imaging apparatus when performing panning. To do.

  In order to achieve the above object, an image pickup apparatus according to a first aspect of the present invention is the image pickup apparatus having an image pickup unit that forms an optical image by an optical system on an image pickup element and generates an image signal based on the optical image. A space for calculating, for each predetermined area, a spatial frequency related to the movement direction of the image in the imaging screen of the image signal based on the movement direction detected by the movement detection unit and a movement detection unit that detects the movement direction of the device A frequency calculation unit, a weighting unit that weights priority for each predetermined region in accordance with the spatial frequency calculated by the spatial frequency calculation unit, and the predetermined region that has a higher priority weighted by the weighting unit. An AF control unit that performs AF by setting the AF region.

  In the imaging device according to a second invention, in the first invention, the weighting unit weights the priority higher as the spatial frequency is higher.

  An imaging apparatus according to a third aspect of the present invention is an imaging apparatus having an imaging unit that forms an optical image by an optical system on an imaging element and generates an image signal based on the optical image, and is acquired at different times by the imaging unit. A contrast change amount calculating unit that detects a change in contrast for each of the predetermined regions between the plurality of image signals, and for each predetermined region according to the contrast change amount calculated by the contrast change amount calculating unit. A weighting unit that weights the priority; and an AF control unit that performs AF by setting the predetermined region having a higher priority weighted by the weighting unit as an AF region.

In the imaging device according to a fourth aspect, in the third aspect, the weighting unit weights the priority higher as the contrast change amount is smaller.
In the imaging device according to a fifth aspect of the present invention, in the first or third aspect of the invention, the weighting unit further includes the predetermined signal that is close to an end of the photographing screen of the image signal in the movement direction detected by the movement detection unit. Weight areas with higher priority.

  According to a sixth aspect of the present invention, there is provided a focus adjustment method for an imaging apparatus, wherein an optical image by an optical system in the imaging apparatus is formed on an imaging element, an image signal based on the optical image is generated, and the moving direction of the imaging apparatus is changed. Based on the detected moving direction, a spatial frequency related to the moving direction of the image in the imaging screen of the image signal is calculated for each predetermined region, and the predetermined region is calculated according to the calculated spatial frequency. The priority is weighted every time, and the predetermined area having a higher weighted priority is set as the AF area, and AF is executed.

  According to a seventh aspect of the present invention, there is provided a focus adjustment method for an image pickup device, wherein an optical image by an optical system in the image pickup device is formed on an image pickup device, an image signal based on the optical image is generated, Detecting a change in contrast for each predetermined area between the image signals of the image, weighting the priority for each predetermined area according to the calculated contrast change amount, and the weighted priority is higher A predetermined area is set as an AF area and AF is executed.

  According to the present invention, it is possible to provide an imaging apparatus and a focus adjustment method capable of focusing on a main subject when performing panning.

1 is a block diagram mainly showing an electrical configuration of a camera according to an embodiment of the present invention. It is a flowchart which shows operation | movement of the camera which concerns on one Embodiment of this invention. It is a figure which shows the example of the weighting for every some focus detection area (AF area) in the camera which concerns on one Embodiment of this invention. In the camera which concerns on one Embodiment of this invention, it is a figure which shows an example of the photographic image and the spatial frequency spectrum which were taken in the panning. It is a figure explaining the conversion to the photographic image and its spatial frequency spectrum in the camera in one Embodiment of this invention.

  A preferred embodiment will be described below using a camera to which the present invention is applied according to the drawings. The camera according to a preferred embodiment of the present invention is a digital camera, and is an imaging device having an imaging unit that forms an optical image by an optical system on an imaging device and generates an image signal based on the optical image, Based on the image signal from the imaging unit, the optical system is moved in the optical axis direction to adjust the focus. That is, the imaging unit (which corresponds to an imaging element 13 and an imaging signal processing circuit 15 to be described later) has a subject image converted into image data by the imaging unit, and so-called contrast AF is performed based on the converted image data. The focus of the optical system is adjusted according to the method.

  In addition, when it is determined that panning is performed from the movement of the camera, the AF area is weighted based on information such as the spatial frequency, the amount of contrast change, and the screen edge in the swing direction. Then, an AF area having the highest priority is selected based on the weighting, and focus adjustment is performed so that the AF area is in focus.

  FIG. 1 is a block diagram mainly showing an electrical configuration of a camera according to an embodiment of the present invention. This camera includes a photographing lens 11, an image sensor 13, an image signal processing circuit 15, an AE evaluation value calculation circuit 17, an AF evaluation value calculation circuit 19 connected to the image signal processing circuit 15, a control unit 21, and this control unit. 21 includes a motor drive circuit 25, an operation unit 27, a memory 29, an image processing circuit 31, an angular velocity detection circuit 33, and the like.

  The photographing lens 11 is composed of a plurality of optical lenses for forming a subject image, and is a single focus lens or a zoom lens. An image sensor 13 is disposed on the optical axis of the photographing lens 11 at a position where a subject image is formed. The image sensor 13 captures a subject image formed by the photographing lens 11. In the imaging device 13, photodiodes constituting each pixel are two-dimensionally arranged in a matrix, and each photodiode generates a photoelectric conversion current according to the amount of received light. Charges are accumulated by a capacitor connected to.

  The imaging signal processing circuit 15 performs charge accumulation control of the imaging device 13 and image signal readout control. The imaging signal processing circuit 15 repeatedly reads out an image signal from the imaging element 13, and the read image signal (also referred to as image data) is sent to the AE evaluation value calculation circuit 17, the AF evaluation value calculation circuit 19, and the control unit 21. Is output.

  The AE evaluation value calculation circuit 17 calculates an AE evaluation value corresponding to the subject luminance based on the image data from the imaging signal processing circuit 15 and outputs the AE evaluation value to the control unit 21.

  The AF evaluation value calculation circuit 19 calculates a contrast value by extracting a high-frequency component from the image data every time image data is output from the imaging signal processing circuit 15, and outputs the contrast value to the control unit 21. To do. The contrast value can be calculated by, for example, a luminance difference between adjacent pixels. The contrast value is calculated for each predetermined area (also referred to as an AF area). The predetermined area is composed of a plurality of pixels, and in the example shown in FIG. 3 to be described later, the photographing screen is divided into 5 × 7 = 35.

  In the motor drive circuit 25, the control unit 21 outputs a focus control signal based on the contrast value. Based on the focus control signal, the lens drive motor 23 is rotated in the normal rotation, reverse rotation, stop, drive speed, and the like. Take control. The lens driving motor 23 can drive the photographing lens 11 back and forth in the optical axis direction, and drives the photographing lens 11 based on a control signal from the motor drive circuit 25.

  The operation unit 27 includes various operation members provided in the camera, detects operation states of the various operation members, and transmits a detection signal to the control unit 21. The various operation members include a power button, a release button, a moving image button, a menu button, a cross button, an OK button, a playback button, and the like.

  The release button in the operation unit 27 has a two-stage switch including a 1st release switch and a 2nd release switch. When the release button is half-pressed, the 1st release switch is turned on. When the release button is further pushed down from the half-press and fully pressed, the 2nd release switch is turned on. When the 1st release switch is turned on, the control unit 21 executes a shooting preparation sequence such as AE processing and AF processing. When the 2nd release switch is turned on, the control unit 21 executes a shooting sequence and performs shooting.

  The memory 29 is a non-volatile memory such as a flash ROM, and stores programs executed in the control unit 21, various adjustment values, and the like. The memory 29 also includes a volatile memory such as a DRAM or SDRAM, and is used for temporary storage of various data such as image data and control instructions.

  The image processing circuit 31 inputs image data, performs image processing, and outputs the image data subjected to this image processing to the control unit 21. As image processing, noise reduction processing, white balance correction, synchronization processing, color conversion, gradation conversion (gamma conversion), edge enhancement, and YC conversion are performed. Also, compression processing of YC converted image data and decompression processing of compressed image data are performed.

  The angular velocity detection circuit 33 includes a sensor such as a gyro, detects the moving direction of the camera, and outputs it to the control unit 21. In the present embodiment, a sensor capable of detecting movement in the direction of five axes (rotation around the x axis, rotation around the y axis, rotation around the z axis, shift in the x axis direction, shift in the y axis direction) is provided. However, the present invention is not limited to this, and any sensor that can detect the moving direction of the camera may be used. The sensor is not limited to the angular velocity sensor. The angular velocity detection circuit 33 has a function as a movement detection unit that detects the movement direction of the imaging apparatus.

  The control unit 21 controls the entire camera, and controls each unit based on a detection signal from the operation unit 27 and signals from other circuits in accordance with a program stored in the memory 29. In addition, the control unit 21 calculates a spatial frequency related to the movement direction of the image signal in the imaging screen for each predetermined region based on the movement direction detected by the angular velocity detection circuit 33 functioning as a movement detection unit. Function as. The function of the spatial frequency calculation unit may be processed by software by the control unit 21, or may be processed by hardware in the control unit 21. The function of the spatial frequency calculation unit is not limited to the control unit 21 and may be processed by hardware in the AF evaluation value calculation circuit 19, the image processing circuit 31, and the like. The calculation of the spatial frequency will be described later with reference to step S5 of FIG. 2, and FIGS. 4D, 4E, and 5.

  The control unit 21 also functions as a weighting unit that weights priority for each predetermined region according to the spatial frequency calculated by the spatial frequency calculation unit. This weighting unit weights higher priority as the spatial frequency is higher. This weighting will be described later using S7 in FIG. 2, FIG.

  The control unit 21 also functions as a contrast change amount calculation unit that detects a change in contrast for each predetermined region between a plurality of image signals acquired at different times by the imaging unit. That is, the contrast calculated by the AF evaluation value calculation circuit 19 is acquired at different times, and a change in contrast is detected for each region. The calculation of the contrast change amount will be described with reference to S9 in FIG.

  The control unit 21 also functions as a weighting unit that weights priority for each predetermined region in accordance with the contrast change amount calculated by the contrast change amount calculation unit. This weighting is performed with higher priority as the contrast change amount is smaller. This weighting will be described later with reference to S11, S13, FIG.

  In addition, when performing the weighting, the control unit 21 weights a predetermined area close to the edge of the image signal shooting screen in the moving direction detected by the movement detecting unit with high priority. In the present embodiment, generally, in panning, since there is a main subject on the leading end side in the moving direction, such weighting is performed. This weighting will be described later with reference to S15 of FIG. 2, FIG.

  In addition, the control unit 21 cooperates with the above-described AF evaluation value calculation circuit 19, the motor drive circuit 25, the lens drive motor 23, and the like as a predetermined region weighted by the weighting unit and having a higher priority. It also functions as an AF control unit that sets and executes AF. The AF control unit calculates a contrast value from the image data of the set AF area, and performs focusing of the photographing lens 11 so that the contrast value reaches a peak. The AF control will be described later using S23 in the figure.

  Next, the operation of the camera according to an embodiment of the present invention will be described using the flowchart shown in FIG. This flowchart is executed by the control unit 21 in accordance with a program stored in the memory 29.

  When the camera is turned on and starts operating, angular velocity is detected (S1). Here, in order to detect whether panning or the like is being performed, a detection signal from the angular velocity detection circuit 33 is input to detect a motion applied to the camera. In the operation of this flow, a subject image is formed by the photographing lens 11 in the camera, and an image signal is generated based on the subject image.

  Once the angular velocity is detected, it is next determined whether or not it is in a swing state (S3). Here, using the angular velocity detected in step S1, it is determined whether the camera is in a swing state by panning, such as from right to left, from left to right, from lower right to upper left.

  If the result of determination in step S3 is that it is in a swing state, processing for setting an AF area suitable for panning is performed in steps S5 to S19. First, the spatial frequency in the swing direction of the current frame is analyzed (S5). The spatial frequency is determined by performing Fourier analysis on the image signal from the image sensor 13.

  The analysis of the spatial frequency for each AF area will be described with reference to FIGS. FIG. 4A is a photograph of a train that travels in the direction from the right hand to the left hand of the screen according to the movement of the train. Since the panning is performed in accordance with the movement of the train, the part of the train seems to be stationary, but the background part is blurred.

  In the present embodiment, the AF area in the imaging area of the imaging device 13 is divided into 35 areas, ie, a total of 5 vertical divisions and 7 horizontal divisions. FIG. 4B is an image obtained by enlarging the AF area A in the screen of FIG. 4A, and this image is a background portion. FIG. 4C is an image obtained by enlarging the AF area B, and this image is the head of the train that is the subject of the panning. 4D shows a spatial frequency spectrum of the AF area A (enlarged image shown in FIG. 4B), and FIG. 4E shows the AF area B (enlarged image shown in FIG. 4C). ) Shows the spatial frequency spectrum.

  The spatial frequency spectrum is obtained by converting an image as shown in FIG. 5A into a frequency domain as shown in FIG. 5B by Fourier transform or the like. Here, FIG. 5A shows a two-dimensional image of the x axis and the y axis, the vertical axis (v axis) of FIG. 5B shows the frequency component [Hz] in the y direction, and the horizontal axis (u axis). ) Indicates a frequency component [Hz] in the x direction, and the origin indicates a direct current component. In the image shown in FIG. 5A, since the frequency component in the y direction is detected as the component orthogonal to the y axis, when converted to the frequency domain, the corresponding component on the v axis is shown in FIG. 5B. A white point is plotted at the frequency position. On the other hand, since there is almost only a direct current component in the x direction, there is no white point plot for the high frequency component on the u-axis as shown in FIG.

  In the example of FIG. 4, the image is flowing and blurred in the AF area A (see FIGS. 4A and 4B), while in the AF area B, the train that is the main subject is stationary due to panning. (See FIGS. 4A and 4C). Therefore, when the high frequency component 41 in the swing direction of the AF area A is compared with the high frequency component 43 in the swing direction of the AF area B, as shown in FIGS. Is smaller than the high-frequency component 43 of the AF area B. Therefore, it can be seen that there is a high possibility that the main subject exists in the AF area where the high-frequency component in the swing direction is large.

  Returning to the flowchart shown in FIG. 2, if the spatial frequency in the swing direction of the current frame is analyzed in step S5, priority weighting is performed on the high-frequency AF area (S7). When the spatial frequency is low, the change of the subject during exposure is large, and the speed difference from the main subject is large. On the other hand, when the spatial frequency is high, the change of the subject during exposure is small, and the speed difference from the main subject is small. In general, in the case of panning, the spatial frequency of the main subject increases because the main subject is imaged so as to follow. Therefore, in this step S7, the priority weighting is increased in the AF area in which the spatial frequency analysis result in the swing direction in step S5 has a high frequency. FIG. 3A shows an example of weighting by the spatial frequency. As can be seen from the figure, the weight of the train part that is the main subject is high.

  Once the priority is weighted in step S7, the amount of contrast change between the previous and current frames is calculated (S9). The AF evaluation value calculation circuit 19 calculates the contrast for each AF area each time an image signal for one frame is read, and outputs the contrast to the control unit 21. The control unit 21 temporarily stores the contrast corresponding to the previous frame and the contrast corresponding to the current frame, and calculates the difference in contrast between the previous and current frames by obtaining the difference between them for the same AF area.

  Once the contrast change amount is calculated, the AF area with the smaller contrast change amount is weighted (S11). When the amount of change in contrast is large, the subject change between frames is large, and the speed difference from the main subject is large. On the other hand, when the contrast change amount is small, the subject change between frames is small, and the speed difference from the main subject is small. In general, in the case of panning, the main subject is chased and shot, so the contrast change amount of the main subject is small. Therefore, in step 11, the AF area having a smaller contrast change amount of the previous and current frames calculated in step S9 is weighted higher.

  When weighting is performed on an AF area having a smaller contrast change amount, an AF area having a contrast value equal to or less than a predetermined value is excluded (S13). If the contrast value is small, there is a high possibility of a miscellaneous subject. Therefore, in this step, areas where the contrast value for each AF area calculated by the AF evaluation value calculation circuit 19 is smaller than a predetermined value are excluded. Specifically, the weighting coefficient is set to 0. Further, as the predetermined value, a value that can be regarded as a miscellaneous subject may be appropriately determined.

  FIG. 3C shows an example in which the weighting is increased for the AF area having a smaller contrast change amount in step S11, and the AF area having a contrast value equal to or less than a predetermined value is excluded in step S13. As can be seen from the figure, the weight of the train part that is the main subject is high.

  If an AF area having a contrast value equal to or less than a predetermined value is excluded in step S13, priority weighting is performed on an AF area closer to the screen end in the swing direction (S15). The AF area close to the screen edge in the swing direction is likely to be the head of the main subject. In the case of panning, if the main subject is positioned at the center, the entire main subject often does not enter the screen, and generally the top of the main subject is often positioned on the screen end side. Therefore, in step S15, the priority is set higher in the AF area closer to the screen end in the swing direction. FIG. 3B shows an example of weighting in the swing direction.

  If the priority is weighted to the AF area closer to the screen end in the swing direction, the priority is then multiplied for each AF area (S17). Here, the weighting results in steps S7, S11 (S13), and S15 are multiplied.

  For example, in the example shown in FIG. 3, in the AF area A, the weighting by the spatial frequency is “0”, the weighting by the contrast change amount is “0”, and the weighting in the swing direction is “5”. The weighted multiplication value is 0 × 0 × 5 = 0. In AF area B, the weighting by the spatial frequency is “5”, the weighting by the contrast change amount is “5”, and the weighting in the swing direction is “5”. × 5 × 5 = 125. In the present embodiment, weighted multiplication is calculated, but the present invention is not limited to this, and other calculations such as addition may be performed.

  Once the priority is calculated for each AF area, the AF area with the highest priority is then selected (S19). Here, based on the priority for each AF area calculated in step S17, the AF area with the highest priority is selected. In the example shown in FIG. 3, the AF area B has the maximum weighting value (= 125), and the AF area B is selected.

  If the AF area with the highest priority is selected, it is next determined whether or not the first release has been pressed (S21). Here, it is determined whether or not the release button in the operation unit 27 is half-pressed and the 1st release switch is turned on.

  If the result of determination in step S <b> 21 is that the first release has not been depressed, the process returns to step S <b> 1 and the above-described operation is repeated. That is, when the camera is in a swing state, the AF area having a high priority is repeatedly selected based on the spatial frequency, the contrast change amount, and the like.

  If the result of determination in step S21 is that the first release has been depressed, or if the result of determination in step S3 is that there is no swing state, contrast AF is executed (S23). Here, the focus position of the photographing lens 11 is adjusted by the AF evaluation value calculation circuit 19, the control unit 21, the motor drive circuit 25, the lens drive motor 23, and the like so that the contrast value from the set AF area becomes a peak. Take control.

  If the swing state is determined in step S3, the set AF area is the AF area with the highest priority selected in step S19. Therefore, in the swing state, it is possible to take a photograph that focuses on the main subject that is the subject of the panning.

  Once contrast AF has been performed, exposure conditions are next determined (S25). Here, based on the subject luminance value calculated by the AE evaluation value calculation circuit 17, exposure control values such as a shutter speed value, an aperture value, and an ISO sensitivity value are determined.

  Once the exposure conditions have been determined, it is next determined whether or not the 2nd release has been depressed (S27). Here, it is determined whether or not the release button in the operation unit 27 is fully pressed and the 2nd release switch is turned on. When the 2nd release is not pushed down, a standby state is entered.

  On the other hand, if the result of determination in step S27 is that the 2nd release has been depressed, exposure processing is executed (S29). Here, a shutter (not shown) opens and closes, an image signal is acquired by the image sensor 13, and image data processed by the image processing circuit 31 is recorded on a recording medium (not shown). Note that the focus position of the photographic lens 11 at this time is the focus position driven in step S23. When the exposure process is finished, this flow is finished.

  As described above, in one embodiment of the present invention, the spatial frequency related to the moving direction (swing direction) of the image in the imaging screen is calculated for each predetermined region (S5), and according to the calculated spatial frequency. Priorities are weighted for each predetermined area (S7), an area having a higher weighted priority is set as an AF area (S19), and AF is executed (S23). Further, a change in contrast for each predetermined area between a plurality of image signals acquired at different times is detected (S9), and priority is weighted for each predetermined area in accordance with the calculated contrast change amount ( S11), a predetermined area having a higher weighted priority is set as an AF area (S19), and AF is executed (S23). For this reason, it is possible to focus on the main subject when performing panning.

  In one embodiment of the present invention, weighting is performed based on the spatial frequency, contrast change amount, contrast value, screen edge in the swing direction, and the like. However, all of these elements need not be detected and weighted, and other elements may be added as a matter of course.

  In the present embodiment, the digital camera is used as the photographing device. However, the camera may be a digital single-lens reflex camera or a compact digital camera, and may be used for moving images such as video cameras and movie cameras. It may be a camera, or may be a camera built into a mobile phone, a smart phone, a personal digital assistant (PDA), a game machine, or the like. In any case, the present invention can be applied to any device that performs focus adjustment by contrast AF.

  In addition, regarding the operation flow in the claims, the specification, and the drawings, even if it is described using words expressing the order such as “first”, “next”, etc. It does not mean that it is essential to implement in this order.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, you may delete some components of all the components shown by embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 11 ... Shooting lens, 13 ... Imaging device, 15 ... Imaging signal processing circuit, 17 ... AE evaluation value calculation circuit, 19 ... AF evaluation value calculation circuit, 21 ... Control part, DESCRIPTION OF SYMBOLS 23 ... Lens drive motor, 25 ... Motor drive circuit, 27 ... Operation part, 29 ... Memory, 31 ... Image processing circuit, 33 ... Angular velocity detection circuit, 41 ... Swing Direction high frequency component, 43... Swing direction high frequency component

Claims (7)

In an imaging apparatus having an imaging unit that forms an optical image by an optical system on an imaging element and generates an image signal based on the optical image.
A movement detection unit for detecting a movement direction of the imaging device;
A spatial frequency calculating unit that calculates, for each predetermined region, a spatial frequency related to the moving direction of the image in the imaging screen of the image signal based on the moving direction detected by the movement detecting unit;
A weighting unit that weights the priority for each predetermined region according to the spatial frequency calculated by the spatial frequency calculation unit;
An AF control unit that performs AF by setting the predetermined region with higher priority weighted by the weighting unit as an AF region; and
An imaging device comprising:   The imaging device according to claim 1, wherein the weighting unit weights the priority higher as the spatial frequency is higher. In an imaging apparatus having an imaging unit that forms an optical image by an optical system on an imaging element and generates an image signal based on the optical image.
A contrast change amount calculation unit for detecting a change in contrast for each of the predetermined regions between a plurality of image signals acquired at different times by the imaging unit;
A weighting unit that weights the priority for each predetermined region according to the contrast change amount calculated by the contrast change amount calculation unit;
An AF control unit that performs AF by setting the predetermined region with higher priority weighted by the weighting unit as an AF region; and
An imaging device comprising:   The imaging apparatus according to claim 3, wherein the weighting unit weights the priority higher as the contrast change amount is smaller.   4. The weighting unit according to claim 1, wherein the weighting unit weights the predetermined region close to the end of the image screen of the image signal in the moving direction detected by the movement detecting unit with higher priority. The imaging device described. An optical image by an optical system in the imaging device is formed on an imaging device, and an image signal based on the optical image is generated.
Detecting the moving direction of the imaging device,
Based on the detected moving direction, the spatial frequency related to the moving direction of the image in the imaging screen of the image signal is calculated for each predetermined region,
Priorities are weighted for each of the predetermined areas according to the calculated spatial frequency,
Set the weighted predetermined area with higher priority as an AF area and execute AF;
A focus adjustment method for an image pickup apparatus. An optical image by an optical system in the imaging device is formed on an imaging device, and an image signal based on the optical image is generated.
Detecting a change in contrast for each predetermined region between a plurality of image signals acquired at different times;
Priorities are weighted for each of the predetermined areas according to the calculated contrast change amount,
Set the weighted predetermined area with higher priority as an AF area and execute AF;
A focus adjustment method for an image pickup apparatus.