JPH0531469U - Video signal processing circuit for camera-integrated VTR - Google Patents

Abstract

(57) [Summary] [Structure] The frame read detection control unit 13 detects the zoom ratio of the camera unit 2 and controls the read image area. Further, the zoom ratio control unit 14 changes the zoom ratio of the zoom unit 6 based on the read frame size detected by the frame read detection control unit 13. As a result, the image frame and zoom ratio due to camera shake are kept constant. [Effect] In the range where the amount of camera shake is small, it is possible to suppress the deterioration of the image resolution by reducing the enlargement ratio of the image.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a video signal processing circuit for a camera-integrated VTR, and more particularly to a video signal processing circuit for a camera-integrated VTR that performs camera shake correction.

[0002]

[Prior Art]

 Conventionally, in the image stabilization of such a camera-integrated VTR, an input screen from the camera unit is stored in a memory, and a small screen frame (for example, 70% fixed frame of the input screen) corresponding to the motion of the camera shake is stored in the memory. Then, the movement of the camera shake is absorbed by reading from the memory, and the read screen (small screen) is enlarged to the input screen size (fixed multiplication factor of about 1.4 times).

FIG. 3 is a block diagram of a video signal processing circuit for a camera-integrated VTR showing a conventional example. As shown in FIG. 3, a conventional video signal processing circuit includes a camera section 2 for converting a subject image 1 into a video signal, an A / D conversion section 3 for converting an analog signal which is a video signal into a digital signal, A field memory unit 5 for storing the A / D-converted digital signal and an image shake detection control unit 4a for correcting image shake due to camera shake are included. Further, such a video signal processing circuit includes a zoom unit 6a for enlarging a shake-corrected image area (readout screen) to a recorded image area, and a D / A conversion unit 7 for converting the digital video signal into an analog video signal. A recording / reproducing unit 8 which records an analog video signal or reproduces a recorded video signal and outputs it as a video output 9, a zoom drive unit 10 which controls the camera unit 2, a zoom drive unit 10, and an image shake detection. A system control unit 11 for controlling the control unit 4 and the recording / reproducing unit 8 and a key input unit 12 for inputting setting contents to the system control unit 11 from the outside are provided. These circuits correct the image shake due to camera shake.

The operation of the main part of this video signal processing circuit will be described below. First, the subject image 1 is zoomed by the camera unit 2 to an arbitrary (desired to take) size (standard, magnified) and converted into a video signal. The video signal is converted into a digital signal through the A / D converter 3. The converted digital video signal is written in the field memory unit 5. The field memory unit 5 stores the data of one field screen (1/2 screen), reads it out based on the motion control signal from the image shake detection control unit 4a, changes the area, and the image 1 of the subject is shaken. Correct the amount of movement. At this time, the read area has a constant size (for example, 70% of the recording area), and the zoom ratio of the zoom unit 6a is also constant (about 1.4 times). The image blur detection control unit 4a detects the direction and amount (motion vector) of the motion by comparing the previous field screen and the current field screen stored in the field memory unit 5, and detects the motion vector. The read area of the screen (the read frame is fixed) is determined according to the above.

[0005]

[Problems to be solved by the device]

 The above-mentioned conventional video signal processing circuit for VTR with built-in camera fixes the read-out area (frame) at the time of screen shake correction and the enlargement ratio after correction, so when the movement of camera shake is small (when the zoom ratio is small). Etc.) has a drawback that the utilization rate of the input screen of the camera section becomes poor, and that the resolution of the image decreases because the enlargement ratio of the readout screen becomes large.

An object of the present invention is to provide a video signal processing circuit for a camera-integrated VTR capable of improving the utilization rate of the input screen of the camera unit and improving the resolution even when the zoom ratio is small. is there.

[0007]

[Means for Solving the Problems]

 The video signal processing circuit for a camera-integrated VTR of the present invention comprises a camera unit for converting a subject image into a video signal, an A / D conversion unit for converting the video signal into a digital signal, and an A / D conversion unit. A field memory unit for storing the digital signal, an image shake detection control unit for correcting image shake caused by camera shake based on outputs from the A / D conversion unit and the field memory unit, and a shake-corrected read image area A zoom section for enlarging the recorded image area, a D / A conversion section for converting a digital video signal from the zoom section into an analog video signal, and recording an analog video signal from the D / A conversion section. Alternatively, a recording / reproducing unit that reproduces a recorded video signal, a zoom driving unit that controls the camera unit, and a zoom driving unit and the recording / reproducing unit are controlled. System control section, a key input section for inputting setting contents to the system control section from the outside, a zoom ratio depending on the position of the zoom lens of the camera section, which is connected to the zoom drive section and the system control section. A frame read detection control unit that detects and controls the read image area of the image shake detection control unit; and a zoom ratio control unit that controls the zoom ratio of the zoom unit according to the read frame size from the frame read detection control unit. And the read image area at the time of the camera shake correction is configured to be linked to the zoom amount of the camera unit.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a video signal processing circuit for a camera-integrated VTR showing a first embodiment of the present invention. As shown in FIG. 1, in addition to the conventional example of FIG. 3 described above, the present embodiment controls the image shake detection control unit 4 by a signal from the zoom drive unit 10 and the system control unit 11 and outputs the read frame size. The frame read detection control unit 13 and the zoom ratio control unit 14 that receives the read frame size signal and controls the zoom ratio of the zoom unit 6 are included. For this reason, the image blur detection control unit 4 and the zoom unit 6 are slightly changed. The operation of the video signal processing circuit will be described below.

First, the subject image 1 is zoomed by the camera unit 2 to a desired size (standard, magnified). The frame read detection control unit 13 detects the zoom ratio. The image frame is reduced when the zoom ratio is increased, and is enlarged when the zoom ratio is decreased, and the image frame and zoom ratio due to camera shake are controlled to be constant (inverse proportion). As a result, the image blur caused by camera shake can be made constant regardless of the zoom ratio of the camera unit 2. However, it is necessary to set the screen readout frame size at maximum zoom within the range of screen quality or camera shake. Further, the video signal of the camera section 2 is converted into a digital signal through the A / D conversion section 3 and written in the field memory section 5. The written video signal changes the read area based on the motion control signal from the image shake detection controller 4. However, the frame size of the area is controlled by the frame read detection control unit 13.

Next, the image shake detection control unit 4 detects the direction and amount (motion vector) of the motion by comparing the previous field screen and the current field screen stored in the field memory unit 5. , The reading area (center value) of the screen is determined according to this motion vector. Further, based on the frame size designation in the frame read detection control unit 13, the zoom ratio control unit 14 instructs the zoom unit 6 an enlargement ratio suitable for the frame size to match the input screen size. It should be noted that the image blur detection control unit 4 and the zoom unit 6 may be any means as long as they can change the readout area and the zoom ratio. That is, these points have been fixed in the past.

Further, the digital signal magnified by the zoom unit 6 is recorded / reproduced by the recording / reproducing unit 8 via the D / A converting unit 7, and becomes a video output 9.

FIG. 2 is a block diagram of a video signal processing circuit for a camera-integrated VTR showing a second embodiment of the present invention. As shown in FIG. 2, in comparison with the first embodiment described above, this embodiment is a motion amount storage that stores the amount of camera shake according to the zoom ratio of the camera unit 2 and the motion vector of the image shake detection control unit 4. The difference is that a part 15 is added, and the other parts are the same. In the present embodiment, the amount of camera shake (the degree of camera shake) of the user is detected, and the frame reading area (frame) is changed by using the recording, and the reading frame is enlarged for a user with a small amount of camera shake. As a result, the resolution of the image can be maintained and the deterioration of the image can be reduced.

[0014]

[Effect of the device]

 As described above, in the video signal processing circuit for a VTR with a built-in camera of the present invention, the frame reading area for image blur correction, which has been fixed in the past, is interlocked with the zoom rate of the camera unit, or the zoom rate and the image blur are combined. By keeping the ratio with the correction frame readout area constant, the image enlargement ratio can be reduced in the range where the amount of camera shake is small, thus improving the utilization rate of the input screen and suppressing deterioration of the video resolution. The effect is that you can

[Brief description of drawings]

FIG. 1 is a camera-integrated VT showing a first embodiment of the present invention.
It is a block diagram of a video signal processing circuit for R.

FIG. 2 is a camera-integrated VT showing a second embodiment of the present invention.
It is a block diagram of a video signal processing circuit for R.

FIG. 3 is a block diagram of a video signal processing circuit for a camera-integrated VTR showing a conventional example.

[Explanation of symbols]

 1 subject image 2 camera unit 3 A / D conversion unit 4 image shake detection control unit 5 field memory unit 6 zoom unit 7 D / A conversion unit 8 recording / playback unit 9 video output 10 zoom drive unit 11 system control unit 12 key input unit 13 frame reading detection control unit 14 zoom ratio control unit 15 motion amount storage unit

Claims (1)

[Scope of utility model registration request] 1. A camera section for converting a subject image into a video signal, and an A / C for converting the video signal into a digital signal.
A D conversion unit, a field memory unit that stores a digital signal from the A / D conversion unit, and image blur detection control that corrects image blur due to camera shake based on outputs from the A / D conversion unit and the field memory unit. Section, a zoom section for enlarging the shake-corrected read-out image area to a recorded image area, a D / A conversion section for converting a digital video signal from the zoom section into an analog video signal, and the D / A conversion section.
A recording / reproducing unit for recording an analog video signal from the A conversion unit or reproducing the recorded video signal, a zoom driving unit for controlling the camera unit, and a zoom driving unit and the recording / reproducing unit. System control unit, a key input unit for inputting setting contents to the system control unit from the outside, a zoom ratio connected to the zoom drive unit and the system control unit, and a zoom ratio depending on a position of a zoom lens of the camera unit. A frame read detection control unit that detects and controls the read image area of the image shake detection control unit, and a zoom ratio control unit that controls the zoom ratio of the zoom unit according to the read frame size from the frame read detection control unit. And a camera-integrated VT in which the read-out image area at the time of the camera shake correction is interlocked with the zoom amount of the camera unit. Use the video signal processing circuit.