JPH05308581A - Image display system - Google Patents

Abstract

PURPOSE:To impart a display function with high resolution or wide angle of field for image sensors arranged in oblique grid shape by using image sensors arranged in square grid shape. CONSTITUTION:An image signal image-picked up in an oblique direction by a video camera 1 in which the image sensor 2 where a picture element is arranged in square grid shape is arranged by inclining by 45 deg. is A/D-converted by an A/D converter 3, and it is written on image memory 4. A picture element signal is read out from the image memory 4 so that the image signal from the video camera 1 can be changed to the one in shape rotating the image signal by 45 deg., and the signal, after being D/A-converted and receiving signal processing at a signal processing circuit 6, is displayed as an erected image with high resolution on a monitor 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses an image sensor composed of a pixel array of a square lattice array so as to have a display function of high resolution or wide angle of view when the pixels are arrayed in an oblique lattice pattern. Image display method.

[0002]

2. Description of the Related Art Generally, CCD or CMD (Char
A video camera that uses an image sensor that uses amplification type photoelectric conversion elements such as ge modulation devices) as pixels is configured by arranging the image sensors that are arranged in a square lattice pattern in an upright shape inside the camera. An image signal obtained from this video camera is input to a monitor and displayed as it is as an erected image.

[0003]

By the way, in general, the visual sensitivity to resolution in human visual characteristics is high in the horizontal and vertical directions and low in the diagonal directions. Therefore, as shown in FIG. By arranging the pixels 11 in a diagonal grid pattern, high resolution can be obtained in the horizontal or vertical direction even if the pixels are arranged so that the pixel intervals in the diagonal direction do not change. Therefore, the diagonal grid-like pixel arrangement is an ideal configuration.

However, in the CCD image sensor, it is difficult to provide the openings in the diagonal grid shape, and in the image sensor using the CMD, when the pixels are arranged in the diagonal grid shape, the wiring for the pixels is The contact portion must be made small, the design rules become strict, and it becomes difficult to reduce the pixel size. Therefore, even in the image sensor using the CMD, it is difficult to arrange the pixels in a diagonal grid pattern.

The present invention has been made in order to solve the above problems in the conventional image sensor, and has a function of substantially arranging pixels in a diagonal grid using a pixel array in a square grid. It is an object of the present invention to provide a possible image display method.

[0006]

In order to solve the above-mentioned problems, the present invention uses a video camera in which an image sensor composed of a pixel array of a square lattice array is rotated 45 degrees in advance and arranged diagonally. Then, the subject is imaged in an oblique direction, the image data obtained from the image pickup signal is subjected to 45-degree rotation processing in the image processing circuit, and the rotation-processed image is displayed as an erect image on the monitor.

As described above, the image on the monitor is displayed as an erect image by performing the image processing for rotating the image in the oblique direction obtained from the video camera by 45 degrees.
An image having the same high resolution as the image captured by the image sensor in which the pixels are arranged in a diagonal grid pattern can be obtained. When the resolution is not changed, it can be displayed as a wide-angle image.

[0008]

EXAMPLES Next, examples will be described. FIG. 1 is a block diagram showing a configuration example of an image display device for explaining an embodiment of an image display system according to the present invention. In the figure, 1 is a video camera, 2 is an image sensor arranged in the video camera 1, and the image sensor 2 is provided with a pixel array in which pixels are arranged in a square lattice shape, and is rotated by 45 degrees in an oblique direction. It is arranged inside the video camera 1 with a tilt. 3 is an A / D converter, 4 is an image memory, 5 is D
A / A converter, 6 is a signal processing circuit, and 7 is a monitor.

Next, the operation of the image display device configured as described above will be described. First, the image signal shown in FIG. 2A obtained by picking up an image of a subject in an oblique direction with the video camera 1 is A / D converted by the A / D converter 3 and then write-controlled to the image memory. Written to 4. Next, as shown in FIG. 2B, the pixel signals are read out in a dot-sequential manner from the image memory 4 by dot control so that the image signals from the video camera 1 are rotated by 45 degrees as shown in FIG. 2B. This read image data is
The A / A converter 5 performs D / A conversion, the signal processing circuit 6 performs signal processing, and then displays on the monitor 7. As a result, it is possible to display on the monitor 7 an erect image of an equivalent high-resolution imaged subject imaged by the image sensor in the diagonal grid array.

Next, the operation for displaying an image with the same resolution and a wide angle of view will be described. Also in this case, the operation until the image signal from the video camera 1 shown in FIG. 3A is written in the image memory 4 is the same as in the case of the high resolution display described above, and the image memory 4 is rotated by 45 degrees. When the pixel signals are read out dot-sequentially so as to obtain an image signal of the above-mentioned shape, as shown in FIG. 3B, the reading speed is changed, that is, the reading frequency is read by 1 / 1.4 times. As a result, an erect image can be displayed on the monitor 7 with a wide field angle of 1.4 times without changing the resolution.

In the case of wide-angle display, if necessary, as shown in FIG. 3C, the interpolated pixel data is arranged at the position of x, so that the change of the signal between pixels is changed. Can be smoothed and the image can be smoothed.
Various methods can be used for the interpolated pixel data, for example, the interpolated pixel data is created from data of four surrounding pixels.

[0012]

As described above on the basis of the embodiments,
According to the present invention, an image signal obtained from a video camera in which an image sensor is rotated 45 degrees in advance and is obliquely arranged is
Image processing with rotation is performed and it is displayed on the monitor, so it is possible to display a high resolution image equivalent to that captured by an oblique grid image sensor, and an image with the same resolution and a wide angle of view. Can be displayed.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a configuration example of an image display device for explaining an embodiment of an image display system according to the present invention.

FIG. 2 is an explanatory diagram showing an operation example of the image display device shown in FIG.

FIG. 3 is an explanatory diagram showing another operation example.

FIG. 4 is an explanatory diagram showing a configuration of an image sensor in a diagonal grid array.

[Explanation of symbols]

 1 Video Camera 2 Image Sensor 3 A / D Converter 4 Image Memory 5 D / A Converter 6 Signal Processing Circuit 7 Monitor

Claims (1)

[Claims] 1. An image data obtained from an image pickup signal of an object by obliquely picking up an image of a subject by using a video camera having an image sensor composed of a pixel array of a square lattice array rotated 45 degrees in advance and arranged in an oblique direction. With the image processing circuit 45
An image display method characterized by performing a degree rotation process and displaying the rotated image as an erect image on a monitor.