JP5537390B2 - Video signal processing apparatus and camera apparatus - Google Patents

Description

  The present invention relates to a video signal processing device that outputs a video signal to a viewfinder of a television camera, for example, and a camera device that includes a viewfinder.

  2. Description of the Related Art Conventionally, an imaging apparatus such as a television camera has a viewfinder configured with a small cathode ray tube, a liquid crystal screen, or the like. The photographer performs camera work while viewing the captured image displayed on the viewfinder screen. In a conventional imaging device, when a photographer performs camerawork that excessively changes the shooting direction, the position of the imaging device, and the like, the shot image may give an unpleasant feeling to the viewer. Therefore, the conventional imaging device has a problem that it may not be possible to provide a captured video that is easy to view for the viewer.

  In order to solve this problem, for example, an imaging apparatus described in Patent Document 1 has been proposed. This imaging apparatus has a configuration in which a moving amount of a video signal between fields is detected, and this moving amount is displayed as a numerical value on a viewfinder as a moving amount of a pan / tilt operation. With this configuration, the imaging apparatus described in Patent Document 1 can provide a captured video that is easy for the viewer to view if the photographer performs a pan / tilt operation so as not to exceed the numerical value displayed on the viewfinder. .

JP 2006-237927 A

  However, in the imaging apparatus described in Patent Document 1, the photographer performs the pan / tilt operation while viewing the numerical value indicating the movement amount of the pan / tilt operation displayed on the screen of the viewfinder and the photographed image being photographed. Since this has to be done, there has been a problem that the burden on the photographer increases.

  The present invention has been made to solve the conventional problems, and provides a video signal processing apparatus and a camera apparatus that can provide a captured video that is easy for the viewer to view without increasing the burden on the photographer. For the purpose.

  The video signal processing apparatus according to the present invention is a video signal processing apparatus for processing a video captured by a camera, wherein a camera operation detecting means for detecting a movement direction and acceleration when the camera is moved, and the acceleration is predetermined. Determination means for determining whether or not the acceleration threshold value is less than, and video cutout means for cutting out a shot video in a predetermined shooting range from a shot video shot by the camera and outputting a signal of the cutout shot video. The image cut-out means cuts out a shot image of a predetermined reference shooting range when the determination means determines that the acceleration is less than the acceleration threshold, and the acceleration is determined to be equal to or greater than the acceleration threshold. In some cases, a captured image that is moved by a distance corresponding to the acceleration in the moving direction is cut out from the captured image in the reference shooting range.

  With this configuration, in the video signal processing device of the present invention, when the determination unit determines that the acceleration when the camera is moved is greater than or equal to the acceleration threshold value, the video clipping unit moves in the direction of movement with respect to the captured video in the reference shooting range. A captured image moved by a distance corresponding to the acceleration is cut out and displayed on the viewfinder. As a result, the video signal processing apparatus of the present invention can suppress movement when the camera is moved by displaying only the captured video on the viewfinder and allowing the photographer to visually recognize the video. Therefore, the video signal processing apparatus of the present invention can provide a captured video that is easy for the viewer to view without increasing the burden on the photographer.

The video signal processing apparatus of the present invention is a video signal processing apparatus for processing a video captured by a camera, and detects a change direction and a change speed when a focal length of a zoom lens included in the camera is changed. Motion detection means, determination means for determining whether or not the change speed is less than a predetermined change speed threshold, and a shot image cut out from a shot image shot by the camera and cut out in a predetermined shooting range Video cutting means for outputting a video signal, wherein the video cutting means captures a predetermined reference shooting range when the determination means determines that the change speed is less than the change speed threshold. When the video is cut out and the change speed is greater than or equal to the change speed threshold and the change direction is determined to zoom in on the subject, the reference is set according to the change speed. When a captured video in a range narrower than the shadow range is cut out and the change speed is equal to or greater than the change speed threshold and the change direction is determined to zoom in on the subject, the change is faster than the reference shooting range. It has a configuration for cutting out a wide range of captured images.

  With this configuration, in the video signal processing device of the present invention, when the determination unit determines that the change speed of the focal length of the zoom lens is equal to or higher than the change speed threshold, the video cutout unit is configured to change the focal length change direction. A captured image in a range narrower or wider than the reference imaging range is cut out and displayed on the viewfinder. As a result, the video signal processing apparatus of the present invention can suppress the change speed of the focal length of the zoom lens by displaying only the captured video on the viewfinder and allowing the photographer to visually recognize it. Therefore, the video signal processing apparatus of the present invention can provide a captured video that is easy for the viewer to view without increasing the burden on the photographer.

  In the video signal processing apparatus according to the present invention, the camera motion detection unit detects the motion direction and the acceleration by performing an image processing on an acceleration sensor that detects the motion direction and the acceleration, or an image captured by the camera. The structure provided with the part is preferable.

  In the video signal processing apparatus according to the present invention, the camera motion detection unit detects a focal length of the zoom lens by performing image processing on a captured image of the camera or a focal length sensor that detects a focal length of the zoom lens. A configuration including an image processing unit is preferable.

  The camera device of the present invention has a configuration including a viewfinder that displays the output of the video signal processing device.

  With this configuration, in the camera device of the present invention, the viewfinder moves according to the change in the focal length of the zoom lens and the captured image in which the viewfinder moves by a distance corresponding to the acceleration in the movement direction with respect to the captured image in the reference shooting range. A captured image in a narrower range or a wider range than the reference shooting range is displayed. As a result, the camera device of the present invention can suppress the movement speed when the camera is moved and the changing speed of the focal length of the zoom lens by displaying only the captured image on the viewfinder and allowing the photographer to visually recognize it. . Therefore, the camera device of the present invention can provide a photographed image that is easy for the viewer to view without increasing the burden on the photographer.

  The present invention can provide a video signal processing device and a camera device having an effect of being able to display a video that is easy to view for a viewer.

1 is a block diagram showing a configuration of an imaging system in a first embodiment of the present invention. The figure which shows the camera picked-up image and viewfinder image in 1st Embodiment of this invention. Explanatory drawing of the image cut-out range when the photographer pans the camera head to the right with respect to the subject in the first embodiment of the present invention. Explanatory drawing of the image cut-out range when the photographer changes the focal length of the zoom lens in the zoom-in direction in the first embodiment of the present invention. The figure which shows each coordinate of the imaging | photography range, the image | video cutout range, and the viewfinder display range in 1st Embodiment of this invention. In the first embodiment of the present invention, the flowchart of the pan operation of the imaging system The flowchart of the operation | movement regarding the focal distance change of the zoom lens of an imaging system in 1st Embodiment of this invention. The block diagram which shows the structure of the imaging system in 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that an example in which the video signal processing apparatus of the present invention is applied to an imaging system that captures images of the Super Hi-Vision standard will be described.

(First embodiment)
First, the configuration of a first embodiment of an imaging system including a video signal processing device according to the present invention will be described.

  As shown in FIG. 1, the imaging system 1 in this embodiment includes a camera head 100 and a video signal processing device 10. Here, the camera head 100 constitutes a camera device according to the present invention.

  The camera head 100 includes a camera body 110 and a lens barrel 120. The camera body 110 includes an image sensor 111, a drive circuit 112, a video signal processing circuit 113, a storage unit 114, a drive circuit 115, a zoom switch 116, and an acceleration sensor 117. The lens barrel 120 includes a zoom lens 121, a zoom lens motor 122, and a focal length sensor 123.

  The image sensor 111 is constituted by, for example, a CMOS image sensor, has 33 million pixels (7680 × 4320 pixels) equivalent to the full resolution of the Super Hi-Vision standard, and can capture images at a frame rate of 60 frames / second. The image sensor 111 is driven by a drive circuit 112.

  The video signal processing circuit 113 stores a super high-definition video signal obtained by performing predetermined processing such as noise removal, amplification, and analog signal digital signal conversion on the output signal of the image sensor 111 and the video signal processing. The data is output to the device 10.

  The storage unit 114 is configured by, for example, a hard disk drive, and stores the video signal from the video signal processing circuit 113.

  The drive circuit 115 drives the zoom lens motor 122 according to the operation of the zoom switch 116 by the photographer.

  The acceleration sensor 117 is incorporated in or externally attached to the camera head 100 and detects the three-dimensional acceleration of the camera head 100. Here, the acceleration sensor 117 constitutes a camera motion detection unit according to the present invention.

  Specifically, the acceleration sensor 117 is used when the photographer performs a panning or tilting operation of the camera head 100, moves in a direction in which the camera head 100 itself approaches or moves away from the subject, or moves in a left-right direction. When the movement is performed, the acceleration of the camera head 100 is detected. With this acceleration, the movement and direction of the camera head 100 can be known. The acceleration sensor 117 outputs an acceleration signal indicating the detected acceleration of the camera head 100 to the video signal processing apparatus 10.

  The viewfinder 118 includes, for example, a liquid crystal screen that displays a high-definition (registered trademark) standard resolution (1920 × 1080 pixels) image at a frame rate of 30 frames / second, and presents the photographed image to the photographer. .

  The zoom lens 121 is moved in a direction toward or away from the subject according to the movement of the zoom lens motor 122.

  The focal length sensor 123 detects the focal length of the zoom lens 121 by detecting the position of the zoom lens 121. The focal length sensor 123 outputs a focal length signal indicating the detected focal length of the zoom lens 121 to the video signal processing apparatus 10. Here, the focal length sensor 123 constitutes a camera motion detection unit according to the present invention.

  The video signal processing apparatus 10 includes a video cutout unit 11, a down converter 12, a video cutout position calculation unit 13, and a memory 14. The video signal processing apparatus 10 includes, for example, a CPU, a ROM, a RAM, and the like.

  The video cutout unit 11 cuts out a Super Hi-Vision standard video signal output from the video signal processing circuit 113 based on a cutout position signal input from the video cutout position calculation unit 13. Specifically, as illustrated in FIG. 2, the video cutout unit 11 outputs a cutout position signal input from the video cutout position calculation unit 13 to the Super Hi-Vision standard shooting range 31 shot by the camera head 100. Based on this, the video cutout range 32 is cut out. Here, the video cutout unit 11 constitutes a video cutout unit according to the present invention.

  The down converter 12 converts a super high-definition video signal into, for example, a high-definition video signal and outputs the video signal to the viewfinder 118. Specifically, as shown in FIG. 2, the down converter 12 converts the super high-definition video signal in the video cutout area 32 cut out by the video cutout unit 11 into a high-definition viewfinder video 33. Are output to the viewfinder 118.

  The image cutout position calculation unit 13 receives an acceleration signal from the acceleration sensor 117 and can grasp how the camera head 100 is moved. In addition, the image cut-out position calculation unit 13 receives a focal length signal from the focal length sensor 123, grasps the moving direction of the zoom lens 121 based on the focal length signal, and measures the changing speed of the focal length. It has become. Further, the image cutout position calculation unit 13 calculates a cutout position indicating the image cutout range in the normal mode or the auxiliary mode based on the acceleration signal and the focal length signal. The video cut-out position calculation unit 13 constitutes camera operation detection means, determination means, and video cut-out means according to the present invention.

  Here, the normal mode is a mode in which the video cutout position calculation unit 13 causes the video cutout unit 11 to cut out a predetermined fixed video cutout range with respect to the shooting range shot by the camera head 100. Say. Note that the image cutout range in the normal mode corresponds to the reference shooting range according to the present invention.

  On the other hand, in the auxiliary mode, when the acceleration of the camera head 100 exceeds the acceleration threshold, or when the change speed of the focal length of the zoom lens 121 exceeds the change speed threshold, the acceleration and the change speed are appropriate. This is a mode for assisting a photographer's operation on the camera head 100. In this auxiliary mode, when the acceleration or the change speed exceeds each threshold value, the video cut-out position calculation unit 13 causes the video cut-out unit 11 to cut out a video cut-out range corresponding to the change speed of the acceleration or the focal length.

  The acceleration threshold value can be set to, for example, 8 pixels in terms of the number of pixels indicating the amount of movement of the subject by a panning operation or the like per frame on the screen according to the Super Hi-Vision standard. The same applies to the change speed threshold.

  The memory 14 stores in advance data of a video cut-out range in the normal mode, acceleration threshold data indicating a preset acceleration threshold, and change speed threshold data indicating a preset focal length change speed threshold. It is supposed to be.

  Hereinafter, the normal mode and the auxiliary mode will be specifically described with reference to FIGS. 3 and 4.

  FIG. 3 is an explanatory diagram of a video cutout range when the photographer pans the camera head 100 toward the subject in the right direction.

  First, in the normal mode, a pre-fixed video cutout range 42 in which the length of each side in the vertical direction and the horizontal direction is about 90% of the shooting range 41 of the camera head 100 is cut out. The video cut-out position calculation unit 13 outputs a cut-out signal to the video cut-out unit 11 so as to be cut out by the output unit 11. In this case, the viewfinder video 44 is displayed on the viewfinder 118.

  Next, in the auxiliary mode, when the acceleration of the camera head 100 exceeds the acceleration threshold value, the image cutout range 43 is a range moved rightward by a range corresponding to the acceleration with respect to the image cutout range 42 in the normal mode. The video cutting position calculation unit 13 outputs a cutting signal to the video cutting unit 11 so that the video cutting unit 11 cuts the video. In this case, the viewfinder video 45 is displayed on the viewfinder 118. The viewfinder image 45 is an image moved to the right side of the viewfinder image 44, and a space 46 is formed on the right side of the image. The video signal processing apparatus 10 can suppress the panning operation by presenting the photographer with the viewfinder 118 having the length of the space 46 in the panning operation direction corresponding to the acceleration.

  Next, FIG. 4 is an explanatory diagram of a video cutout range when the photographer changes the focal length of the zoom lens 121 in the zooming direction.

  First, in the normal mode, as in the case shown in FIG. 3, the video cutout position calculation unit 13 causes the video cutout unit 52 to cut out the video cutout range 52 with respect to the shooting range 51 of the camera head 100. The cutout signal is output to the video cutout unit 11. In this case, the viewfinder video 54 is displayed on the viewfinder 118.

  Next, in the auxiliary mode, when the change speed of the focal length of the zoom lens 121 exceeds the change speed threshold, the image cut-off range is narrower than the image cut-out range 52 in the normal mode according to the change speed of the focal length. The video cut position calculation unit 13 outputs a cut signal to the video cutout unit 11 so that the video cutout unit 11 cuts out the extraction range 53. In this case, the viewfinder video 55 is displayed on the viewfinder 118. The viewfinder image 55 is an image zoomed up from the viewfinder image 54. Therefore, the video signal processing apparatus 10 can suppress the zoom-up operation by presenting the photographer with the viewfinder 118 with an image in which the change speed of the focal length due to the zoom-up is larger than the actual change speed.

  Although illustration is omitted, when the photographer changes the focal length of the zoom lens 121 in the direction of zooming back, it is the reverse of the case of zooming up. That is, in the auxiliary mode, the video cutout position is set so that the video cutout section 11 cuts out a video cutout range that is wider than the video cutout range 52 in the normal mode according to the changing speed of the focal length. The calculation unit 13 outputs a cutout signal to the video cutout unit 11. The viewfinder image in this case is an image zoomed back from the viewfinder image 54. Therefore, the video signal processing apparatus 10 can suppress the zoom-back operation by presenting the photographer with the viewfinder 118 that has the focal length change speed by zoom-back larger than the actual change speed.

  The operation for returning the image cutout range in the auxiliary mode to the cutout range in the normal mode in the pan operation or the zoom-up operation is, for example, (1) a shooting button provided in the camera head 100 and pressed by the photographer during shooting. (2) When the photographer manually presses the reset button provided on the camera head 100, (3) When the panning operation ends and a certain time has passed, etc. And it is sufficient.

  Next, based on FIG. 5, the shooting range, the video cutout range, and the viewfinder display range will be described using mathematical expressions. In FIG. 5, each coordinate indicates the following range.

_{S 0 (x S0, y S0} ) -S 1 (x S1, y S1): shooting range _{K 0 (x K0, y K0} ) -K 1 (x K1, y K1): video clipping range in the normal mode V ₀ (x _V0 , y _V0 ) −V ₁ (x _V1 , y _V1 ): Image cut-out range in the auxiliary mode Here, the image cut-out range in the auxiliary mode is the image displayed on the viewfinder 118. Equal to range.

  Further, the acceleration in the pan operation and tilt operation of the camera head 100 is represented by (gx, gy), the focal length changing speed of the zoom lens 121 is represented by f, and arbitrary coefficients are represented by α, β, γ, and δ.

  The image cutout range in the auxiliary mode when the photographer performs panning and tilting operations on the camera head 100 is an amount obtained by multiplying the acceleration caused by the panning and tilting operations by an appropriate coefficient in the horizontal and vertical directions. Only the cutout range is offset. That is, the coordinates of the image cutout range in the auxiliary mode in the pan operation and the tilt operation can be expressed as the following equations.

V ₀ (x _V0 , y _V0 ) = (x _K0 + αg _x , y _K0 + γg _y )
V ₁ (x _V1 , y _V1 ) = (x _K1 + αg _x , y _K1 + γg _y )
In addition, when the photographer performs the zoom-up operation or the zoom-back operation of the zoom lens 121, the image cutout range in the auxiliary mode is horizontal and vertical with respect to the focal length change speed by the zoom-up operation or the zoom-back operation The cutout range is reduced or enlarged by an amount obtained by multiplying the direction by an appropriate coefficient. That is, the coordinates of the video cutout range in the auxiliary mode in the zoom-up operation or the zoom-back operation can be expressed as

V ₀ (x _V0 , y _V0 ) = (x _K0 + βf, y _K0 + δf)
_{V 1 (x V1, y V1} ) = (x K1 -βf, y K1 -δf)
Further, the coordinates of the video cut-out range in the auxiliary mode can be expressed as follows by combining the pan operation and tilt operation with the zoom-up operation or the zoom-back operation.

V ₀ (x _V0 , y _V0 ) = (x _K0 + αg _x + βf, y _K0 + γg _y + δf)
_{V 1 (x V1, y V1} ) = (x K1 + αg x -βf, y K1 + γg y -δf)
Next, the operation of the photographing system 1 in the present embodiment will be described based on the flowcharts shown in FIGS. 6 and 7 with reference to FIGS. In the following description, it is assumed that the camera head 100 outputs a video signal obtained by photographing a subject to the video signal processing device 10.

  First, the operation of the video signal processing apparatus 10 when the photographer performs the pan operation of the camera head 100 will be described with reference to FIG. Note that the same operation is performed when the photographer performs a tilting operation of the camera head 100 or when the camera head 100 is moved in the horizontal direction or the vertical direction toward the subject.

  First, the image cutout position calculation unit 13 reads data indicating the image cutout range in the normal mode and acceleration threshold data from the memory 14 (step S11).

  Subsequently, the acceleration sensor 117 measures the acceleration of the camera head 100 (step S <b> 12) and outputs an acceleration signal to the image cutout position calculation unit 13.

  Then, the image cutout position calculation unit 13 determines whether or not the acceleration of the camera head 100 is less than the acceleration threshold (step S13).

  In step S13, when the acceleration of the camera head 100 is less than the acceleration threshold, the video cutout position calculation unit 13 outputs a cutout position signal for cutting out the video in the video cutout range in the normal mode. Output to. Then, the video cutout unit 11 cuts out the video within the video cutout range based on the input cutout position signal (step S14).

  On the other hand, if the acceleration of the camera head 100 is greater than or equal to the acceleration threshold value in step S13, the video cutout position calculation unit 13 cuts out a video cutout range in which the cutout position is changed in the direction of large acceleration. The signal is output to the video cutout unit 11. Then, the video cutout unit 11 cuts out the video within the video cutout range based on the input cutout position signal (step S15).

  The video signal cut out in step S14 or S15 is input to the down converter 12, and the down converter 12 converts the video signal into a video signal having a resolution that can be displayed by the viewfinder 118 and outputs the video signal to the viewfinder 118. As a result, the down-converted video is displayed on the viewfinder 118 (step S16).

  Thereafter, each step from step S12 to step S16 is repeatedly executed in real time.

  Next, the operation of the video signal processing apparatus 10 when the photographer changes the focal length of the zoom lens 121 will be described with reference to FIG. Here, in FIG. 7, the same steps as those in FIG. 6 are denoted by the same reference numerals, and redundant description is omitted. Note that the same operation is performed when the photographer moves the camera head 100 itself toward or away from the subject.

  The focal length sensor 123 detects the focal length of the zoom lens 121 by detecting the position of the zoom lens 121, and outputs a focal length signal to the image cutout position calculator 13. The image cut-out position calculation unit 13 receives the focal length signal and measures the changing speed of the focal length of the zoom lens 121 (step S21).

  Subsequently, the image cut-out position calculation unit 13 determines whether or not the change speed of the focal length of the zoom lens 121 is less than the change speed threshold (step S22).

  In step S22, when the change speed of the focal length of the zoom lens 121 is less than the change speed threshold, the video cutout position calculation unit 13 outputs a cutout position signal for cutting out the video in the video cutout range in the normal mode. The image is output to the image cutout unit 11. Then, the video cutout unit 11 cuts out the video within the video cutout range based on the input cutout position signal (step S14).

  On the other hand, in step S22, when the change speed of the focal length of the zoom lens 121 is equal to or higher than the change speed threshold, the video cutout position calculation unit 13 cuts out the video cutout range in which the cutout range is changed in the zoom change direction. Is output to the video cutout unit 11. Then, the video cutout unit 11 cuts out the video within the video cutout range based on the input cutout position signal (step S23).

  As described above, according to the imaging system 1 in the present embodiment, when the acceleration of the camera head 100 is equal to or greater than the acceleration threshold, the image cutout unit 11 responds to the acceleration in the direction of movement more than the captured image in the normal mode. Since the photographed image moved by the distance is cut out and displayed on the viewfinder 118, the movement when the camera head 100 is moved can be suppressed by displaying only the photographed image on the viewfinder 118 and allowing the photographer to visually recognize it. it can.

  In addition, according to the imaging system 1 in the present embodiment, when the change speed of the focal length of the zoom lens 121 is greater than or equal to the change speed threshold, the video cutout unit 11 changes the change speed and change direction of the focal length of the zoom lens 121. Accordingly, since a captured image narrower or wider than the captured image in the normal mode is cut out and displayed on the viewfinder 118, only the captured image is displayed on the viewfinder 118 so that the photographer can visually recognize the zoom lens. The changing speed of the focal length 121 can be suppressed.

  Therefore, the photographing system 1 in the present embodiment can provide a photographed image that is easy for the viewer to view without increasing the burden on the photographer.

  In the above-described embodiment, an example in which the camera head 100 outputs a super high-definition video signal and the viewfinder 118 displays a high-definition video has been described. However, the present invention is not limited thereto. is not.

  In the above-described embodiment, the viewfinder 118 has been described as an example for allowing a photographer to visually recognize a captured image. However, the present invention is not limited thereto, and is incorporated in the camera body 110, for example. A cathode ray tube, a liquid crystal display, etc. may be sufficient.

  In addition, a switch is provided for switching between a shooting operation that changes from the normal mode to the auxiliary mode when the acceleration of the camera head 100 exceeds a threshold value, and a shooting operation that always operates in the normal mode regardless of the acceleration. May be configured to arbitrarily select the shooting operation.

  In the above-described embodiment, the camera head 100 has been described as an example of the imaging device. However, the present invention is not limited to this, and for example, a handy type video camera or a digital camera capable of moving image shooting. Etc.

(Second Embodiment)
As shown in FIG. 8, the imaging system 2 in the present embodiment includes a camera head 200 and a video signal processing device 20. The camera head 200 has a configuration in which the acceleration sensor 117 and the focal length sensor 123 are removed from the camera head 100 of the first embodiment. In addition, the video signal processing device 20 includes a video cut-out position calculation unit 21 instead of the video cut-out position calculation unit 13 of the first embodiment. In addition, the description which overlaps with the description in 1st Embodiment is abbreviate | omitted.

  The video cut-out position calculation unit 21 has an image processing circuit 22. The image processing circuit 22 receives the video signal output from the video signal processing circuit 113 and performs predetermined image processing. Here, the image processing circuit 22 constitutes a camera operation detection unit according to the present invention.

  Specifically, the image processing circuit 22 measures the acceleration of the camera head 100 based on the input video signal. For example, the image processing circuit 22 obtains a motion vector of a predetermined object detected from the photographed image using a motion vector detection technique in an image compression technique such as MPEG, and measures the acceleration of the camera head 200 from the motion vector value. Is.

  The image processing circuit 22 measures the change speed of the zoom lens 121 based on the input video signal. For example, the image processing circuit 22 uses data such as the size of a predetermined reference object image and the positions of a plurality of reference object images, which are included in a captured image that is previously captured at a known focal length of the zoom lens 121. It is stored in the memory 14 as reference data, and the change speed of the zoom lens 121 is measured by obtaining the relationship between the reference data and the size and relative position of the reference object image included in the captured video. is there.

  Since the imaging system 2 in the present embodiment is configured as described above, the acceleration of the camera head 200 and the change speed of the zoom lens 121 can be changed even when the camera head 200 not including the acceleration sensor and the focal length sensor is used. It can be measured.

  Therefore, the imaging system 2 in the present embodiment can suppress the movement when the camera head 100 is moved and the changing speed of the focal length of the zoom lens 121, and the imaging that is easy for the viewer to view without increasing the burden on the photographer. Video can be provided.

DESCRIPTION OF SYMBOLS 1, 2 Imaging system 10, 20 Video signal processing apparatus 11 Video extraction part (video extraction means)
12 Down converter 13, 21 Image cut position calculation unit (camera operation detection means, determination means, image cut means)
14 Memory 22 Image processing circuit (camera operation detection means)
31, 41, 51 Shooting range 32 Image cutout range 33 Viewfinder image 42, 52 Image cutout range in normal mode (reference shooting range)
43, 53 Image clipping range in auxiliary mode 44, 54 Viewfinder image in normal mode 45, 55 Viewfinder image in auxiliary mode 46 Space 100, 200 Camera head 110 Camera body 111 Image sensor 112 Image sensor drive circuit 113 video signal processing circuit 114 storage unit 115 driving circuit for zoom lens motor 116 zoom switch 117 acceleration sensor (camera operation detecting means)
118 Viewfinder 120 Lens barrel 121 Zoom lens 122 Zoom lens motor 123 Focal length sensor (camera operation detection means)

Claims (5)

A video signal processing device for processing video captured by a camera,
Camera motion detection means for detecting a movement direction and acceleration when the camera is moved;
Determining means for determining whether the acceleration is less than a predetermined acceleration threshold;
A video cutout unit that cuts out a shot video of a predetermined shooting range from a shot video shot by the camera, and outputs a signal of the cutout shot video; and
The image cutout means cuts out a shot image of a predetermined reference shooting range when the determination means determines that the acceleration is less than the acceleration threshold, and when the acceleration is determined to be greater than or equal to the acceleration threshold A video signal processing apparatus, wherein a captured video that is moved by a distance corresponding to the acceleration in the movement direction is cut out from a captured video in a reference shooting range. A video signal processing device for processing video captured by a camera,
Camera operation detection means for detecting a change direction and a change speed when the focal length of the zoom lens of the camera is changed;
Determining means for determining whether or not the change speed is less than a predetermined change speed threshold;
A video cutout unit that cuts out a shot video of a predetermined shooting range from a shot video shot by the camera, and outputs a signal of the cutout shot video; and
The video cutout means cuts out a shot video of a predetermined reference shooting range when the determination means determines that the change speed is less than the change speed threshold, and the change speed is equal to or higher than the change speed threshold and the When it is determined that the change direction is a direction to zoom in on the subject, a shot image in a range narrower than the reference shooting range is cut out according to the change speed, the change speed is equal to or greater than the change speed threshold, and the change direction is the subject. A video signal processing apparatus characterized in that when it is determined that the direction of zooming back is determined, the captured video in a range wider than the reference imaging range is cut out in accordance with the change speed.   The camera motion detection unit includes an acceleration sensor that detects the movement direction and the acceleration, or an image processing unit that detects the movement direction and the acceleration by performing image processing on a captured image of the camera. The video signal processing apparatus according to 1.   The camera operation detection unit includes a focal length sensor that detects a focal length of the zoom lens, or an image processing unit that detects a focal length of the zoom lens by performing image processing on a captured image of the camera. Item 3. The video signal processing device according to Item 2.   A camera device comprising a viewfinder for displaying an output of the video signal processing device according to claim 1.

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