JPH07143380A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To reproduce an original image without deteriorating the picture quality even if a vibration-proof range for correcting a deflection is set widely. CONSTITUTION:A camera integrated video camera 1 is provided with a video signal processing circuit 20 for processing a reproducing signal 10, and A/D converter 30, a motion detecting circuit 50, an image memory 40, a system control circuit 60 and a memory control circuit 70. Based on a motion amount detected by the motion detecting circuit 50, the system control circuit 60 outputs a read-out address value of the image memory 40 after correcting the motion, and the memory control circuit 70 reads out moved image data for the purpose of a vibration-proof processing from the image memory 40 in accordance with this read-out address value. An enlargement circuit 80 executes an enlargement processing of the image data in accordance with an enlargement ratio. A reproducing analog video signal converted by a D/A converter 90 is outputted to a monitor 95 of the outside. By a screen size up-key and a screen size down-key 62, the enlargement ratio of the enlargement circuit 80 is changed in accordance with screen size of the monitor 95, and deterioration of an image is suppressed to the minimum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording / reproducing apparatus having a function of preventing image blur due to camera shake.

[0002]

2. Description of the Related Art Conventionally, a video recorder with a built-in camera has been made smaller and lighter by miniaturization of parts used and high density mounting, and anyone can easily take a picture. On the other hand, the rear focus of the mounted lens has made the high-power lens compact, and it has become standard to combine the high-power lens in a small housing. Therefore, if the lens is set to the telephoto end in a small and light housing, camera shake is apt to occur, and the photographed image often becomes unsightly. For this reason, a video signal recording / reproducing device equipped with a function for reducing camera shake has begun to appear on the market.

Various methods described below are known as functions for preventing image shaking. For example, in the pure electronic image blur prevention function, a motion is detected from the output image of the CCD, and the image stored in the field memory is adjusted in the H direction and the V direction according to the motion vector and output. In addition, with the image shake prevention function that uses a variable apex angle prism, a variable apex angle prism that can change the optical axis of the lens is provided at the tip of the lens, and motion is detected from the image output from the CCD Drives the apex angle prism. Further, in the inertial pendulum type image shake prevention function, an inertial pendulum correction lens having a biaxial gimbal structure is arranged around the master lens to cancel the shake. Further, in the shake prevention function of the large area image pickup device, an image pickup device having an area larger than a normal effective screen range (screen size) is used, a motion is detected by an acceleration sensor or the like, and a read start position is controlled by the signal. Further, in the electronic image stabilization function based on the reproduced image, the motion is detected from the reproduced image of the video output, and the image stored in the field memory is read out from the memory according to the motion vector and controlled.

Various other hand shake prevention functions have been proposed, but the electronic shake prevention function based on a reproduced image is different from the other shake prevention functions in that no correction is made during recording. is there. This is recorded on the magnetic tape without any modification to the captured image, so you can stop the shake during playback and add the shake prevention effect only when you want to see it,
It has the feature that it can be played back without shake correction if it is played back as it is, and it is currently receiving attention as the most epoch-making method.

[0005]

However, in the shake prevention function based on the reproduced image, the correction range in which the shake can be prevented is limited to the range of the already-recorded captured image, so that the shake prevention range is widened. However, since the area of the original image is reduced, it is necessary to increase the enlargement ratio by electronic correction, and as a result, there is a problem that the deterioration of the image is likely to appear remarkably. In other words, there is a trade-off between the expansion of the image stabilization range and the deterioration of image quality.To improve image quality, the image stabilization range should be as small as possible and the original image should be enlarged to minimize the enlargement ratio, or be slightly smaller than the captured image. Although it becomes a small image, there is no choice but to play it back without electronic correction.

Although the screen size is fixed on the monitor and the television receiver side for displaying the reproduced image, the effective screen range to be projected varies depending on the receiver manufacturer, and some of them are overscanned. It is not uncommon for a receiver to have its corners sharply cut off, and the reproduced image was not always suitable for the screen size of the receiver.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a video signal recording / reproducing apparatus capable of reproducing an original image without degrading the image quality even if a large image stabilization range for shake correction is set.

[0008]

In order to achieve the above object, the video signal recording / reproducing apparatus of the present invention sets an image stabilization range for image stabilization around the inside of a captured image, and sets the inside of this image stabilization range. A video signal recording / reproducing apparatus for reproducing a reproduced image having a size of the original image on a receiver, the original image extracting means for extracting the original image from the photographed image, and a magnification of the reproduced image with respect to the extracted original image. A magnification setting means that can be set according to the screen size of the receiver, and a reproduction image generation means that enlarges or reduces the original image according to the magnification set by the magnification setting means to generate the reproduction image. A video signal output means for outputting the generated video signal of the reproduced image to the receiver.

[0009]

According to the video signal recording / reproducing apparatus of the present invention, an image stabilization range for image stabilization is set around the inside of a captured image, and the image reproduced within the image stabilization range is reproduced by the receiver. In this case, the original image is extracted from the photographed image by the original image extracting means, and the magnification of the reproduced image with respect to the extracted original image is freely set by the magnification setting means according to the screen size of the receiver, According to the magnification set by the magnification setting means, the reproduction image generating means enlarges or reduces the original image to generate the reproduction image, and the video signal output means receives the video signal of the generated reproduction image. Output to the machine.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A camera-integrated video camera will be described below as a video signal recording / reproducing apparatus according to an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration of a camera-integrated video camera 1. The reproduction signal 10 picked up by the magnetic head (not shown) is transferred to the video signal processing circuit 2
At 0, it is converted into a reproduced analog video signal. The reproduced analog video signal is converted into a digital signal by the A / D converter 30, and the motion detection circuit 50 and the image memory 40 are converted.
Entered in. The image memory 40 takes in digital signals at a rate set by the memory control circuit 70.
The memory control circuit 70 controls the A / D conversion rate, the A / D conversion timing, the write address of the image memory 40, the timing, the read address from the image memory 40, the timing, and the like.

The motion detection circuit 50 detects the amount of motion in one field by performing a matching operation between the previous field image and the current field image and obtaining the difference between them. Based on this motion amount, the system control circuit 60 calculates panning detection, tilting detection, poor subject detection, etc., calculates a final motion vector, and stores the read address value of the image memory 40 after motion correction as a memory. Output to the control circuit 70. According to the read address value of the image memory 40 sent from the system control circuit 60, the memory control circuit 70 sequentially moves the image data after moving for image stabilization processing from the image memory 40 in synchronization with a predetermined clock. read out. Further, the enlargement circuit 80 performs enlargement processing on the read image data in accordance with the enlargement ratio from the system control circuit 60, and outputs the enlarged digital signal to D /
Output to the A converter 90. Thereafter, the D / A converter 90 converts the reproduced analog video signal into a reproduced analog video signal and outputs it to the connected external monitor 95. The system control circuit 60 is also connected to a mode setting switch 63 for setting the image stabilization mode, a screen size up key 61 and a screen size down key 62 for changing the enlargement ratio.

Next, the enlargement processing of the original image in the enlargement circuit 80 will be described. The original image is enlarged by generating data that does not exist between the image data by interpolation, and the original image cannot be enlarged unless the data is interpolated. It is known that the resolution deteriorates as much as the interpolation data increases in the enlarged reproduced image. On the other hand, as described above, although the screen size of the monitor and the television receiver for displaying the reproduced image is fixed, the effective screen range to be displayed varies depending on the receiver manufacturer. In the camera-integrated video camera 1 of the present embodiment, the enlargement ratio in the enlargement circuit 80 is continuously changed by selectively operating the screen size up key 61 and the screen size down key 62 connected to the system control circuit 60. Can be changed to In this way, by adjusting the enlargement ratio so that all images are displayed on the screen according to the screen size of the monitor 95 to be connected, it is possible to avoid making the enlargement ratio unnecessarily large according to the screen size. And as a result,
Image degradation is minimized. In other words, when executing the image stabilization processing, the enlargement ratio may be set by using the screen size up key 61 and the screen size down key 62 so that the reproduced image displayed on the monitor 95 becomes almost the screen size.

Next, the screen size changing routine executed by the system control circuit 60 will be described. FIG. 2 is a flowchart showing a screen size changing routine. First, it is determined whether the mode setting switch 63 is turned on and the image stabilization mode is set (step S1). When the image stabilization mode is not set, this routine ends without changing the screen size. When the image stabilization mode is set, it is determined whether or not the screen size up key 61 is turned on (step S2). When the screen size up key 61 is turned on, the enlargement ratio is incremented by "1" (step S3). If the screen size up key 61 is off, then it is determined whether or not the screen size down key 62 is on (step S4). When the screen size down key 62 is turned on, the enlargement ratio is decremented by "1" (step S5). When the screen size down key 62 is also off after the screen size up key 61, the enlargement ratio is not changed. The screen size enlargement process is executed according to the set enlargement ratio (step S6).

As described above, according to the camera-integrated video camera 1 of this embodiment, the enlargement ratio of the original image with respect to the reproduced image is changed according to the screen size of the monitor 95 to be connected, so that the minimum size is required. It is possible to suppress deterioration of image quality.

[0015]

[Brief description of drawings]

[0016]

FIG. 1 is a block diagram showing a configuration of a camera-integrated video camera 1.

[0017]

FIG. 2 is a flowchart showing a screen size changing routine.

[0018]

[Description of symbols] 1 ... Video camera with integrated camera 61 ... Screen size up key 62 ... Screen size down key 63 ... Mode setting switch

Claims (1)

[Claims] 1. A video signal recording / reproducing apparatus for reproducing a reproduced image in which a size of an original image is set inside the image stabilization range by setting an image stabilization range around the inside of the captured image. An original image extracting means for extracting an original image from the photographed image, a magnification setting means for freely setting a magnification of the reproduced image with respect to the extracted original image according to a screen size of the receiver, and the magnification setting According to the magnification set by the means,
Video signal recording / reproducing including reproduction image generation means for enlarging / reducing the original image to generate the reproduction image, and video signal output means for outputting a video signal of the generated reproduction image to the receiver. apparatus.