JPS62239778A - Image processor - Google Patents

Abstract

PURPOSE:To improve shading in a scanning-line perpendicular direction by providing a ROM which stores correcting values of shading of scanning lines corresponding to counted values of a scanning line counter and an adder which adds the output of an A/D conversion part and the output of the ROM together to perform shading correction. CONSTITUTION:The ROM 8 is stored with the correcting values proportional to vertical positions of scanning lines specified previously by the scanning line counter 5 and a correcting value is outputted according to the indication of the scanning counter 5. The output of the A/D conversion part 2 obtained by converting the video analog signal of a television camera 1 having shading characteristics attenuating linearly in the scanning-line perpendicular direction into a digital signal is added by the adder 7 to the correction output corresponding to the scanning line perpendicular position of the ROM 8 and the sum is inputted to an image memory 8. Consequently, the shading characteristics in the scanning-line perpendicular direction are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image processing device that processes and analyzes image data by inputting nine images using a television camera.

[Conventional technology]

FIG. 3 is a diagram of a conventional image processing apparatus for this food. In Fig. 3, (1) is a television camera that captures images and creates video analog signals; (21 is this television camera +
An analog/digital converter (hereinafter referred to as A/
+31, abbreviated as D conversion section, is the above-mentioned television camera (1
(4) a frame synchronization signal detection unit for detecting a synchronization signal for each screen from the video analog signal obtained from 1;
is a scanning line synchronization signal detection unit for detecting a synchronization signal for each scanning line from the video analog signal obtained from the television camera (1), and (8) is a digital signal output from the A/D conversion unit (2). Image memory lJ that stores image data
, (9) Fi is an image memory output control unit that performs input/output control of digital image data for this image memo (January 8), and α1 is an image display number 1g from the digital image data output from the image memory (8). (13 is the above-mentioned A/Di converter (2))
1 image memory input/output till (illm f9), and a control signal creation unit that creates control signals necessary for the hardware operation of display interface Q1. A processor that processes and analyzes stored image data;
(141#-1 This is an operation unit for giving commands such as control and processing contents to this processor housing 3.

In the image processing apparatus configured as above.

The video analog signal obtained by the television camera (11) is A/D converted by the A/D converter (2) and sent to the image memo 1.
8) and stored as digital image data. Frame synchronization signal detection section (3) and scanning line synchronization signal detection section (
4) Each synchronization signal obtained by
This control signal generator 0 controls the input/output of the image memo (January 8) via the image memory input/output controller (9) and the hardware of the A/Df converter (21, display interface OG). Control signals necessary for operation are created.

The digital image data stored in the image memo (January 8) is processed by the processor
Processing and analysis are performed by.

[Problem that the invention seeks to solve]

The conventional image processing device described above is configured as described above, and the video analog signal 'kA/' obtained by the television camera (1) is
D conversion and A/D conversion output as 'Ushima image memo January 8th
). On the other hand, the TV camera (1
1. Especially when capturing images using slow scanning, the obtained video analog signal deteriorates as the scanning line progresses from top to bottom within one screen of the input image, depending on the frequency characteristics of the video amplifier being used. It has the characteristic of causing so-called shading in the vertical direction, where the image becomes darker than the actual image. For this reason, there has been a problem in that when processing and analyzing an image by a processor, it may be difficult to analyze depending on the input image.

The present invention has been made in order to solve such problems, and its object is to obtain an image processing device that corrects the shading characteristics of image data obtained from a television camera (1). Means for Solving] An image processing device according to the present invention includes a television camera (1)
In order to correct the shading in the scanning line vertical direction of the image data that is expected from the scanning line counter, the scanning line counter is incremented by the scanning line synchronization signal of the scanning line synchronization signal detection unit (4), and the count value of the scanning line counter is It is provided with an RCM that stores the shading correction value of the corresponding scanning line, and an adder that adds the output of the A/D converter and the output of the ROM to perform shading correction.

[Effect]

In this invention, the output of the A/D converter (2) has a shading characteristic that linearly attenuates in the vertical direction of the scanning line, and a signal proportional to the vertical position of the scanning line detected by the scanning line counter can be output. The shading in the vertical direction of the scanning line is improved by inputting image data obtained by adding the output of the ROM in which correction values are stored in advance using an adder into the image memory (8).

〔Example〕

FIG. 1 is a diagram showing an embodiment of the image processing device of the present invention. In FIG. The scanning line counter (6) which is reset and counted up by the scanning line synchronization signal obtained by the scanning line synchronization number 16 detection unit (4) calculates the shading correction value corresponding to the address indicated by this scanning line counter (5). ROM for storing (71 is an adder that adds the output correction value of the ROM 161 and the digital image data output from the A/D converter (2). FIG. 2 shows the characteristics of shading correction according to the present invention. It is a diagram showing (A
) is the output of the A/D converter (2) that shows the shading characteristics of a television camera (11) in which the video signal level decreases linearly with each scanning line, and (8) is the ROM that stores the above shading correction value. The output of (C) is the above A/D
This is the output of the adder which has performed shading correction by adding the output of the converter and the output of the ROM.

In the image processing device configured as described above, the scanning line counter (
5) counts up the scanning line synchronization signal outputted by the scanning line synchronization signal detection section (4) to detect the scanning line vertical position and designate the address of the ROM 161. 1, RO
M (81) stores in advance a correction value proportional to the vertical position of the scanning line designated by the scanning line counter (5) as shown in FIG.
) The above correction value is output according to the instruction.

The output of the A/D converter (2) converts the video analog signal from the television camera (1), which has a shading characteristic that linearly attenuates in the vertical direction of the scanning line as shown in Figure 2 (4), into a digital signal. The above ROM (81) is added with the correction output corresponding to the vertical position of the scanning line by an adder (7) and inputted to one image memory (8), thereby creating an image processing device that improves the shading characteristics in the vertical direction of the scanning line. .

〔Effect of the invention〕

As described above, according to the present invention, the television camera (11
The scanning line counter (5) and the RU M +
By configuring the camera to add the correction values for each movement Tr and the angle created in step 61 and input and store the corrected digital image data in the image memo (January 8), the television camera (at an imaging speed of Vertical shading gold improved l1l
A Ji image processing device can be provided.

[Brief explanation of drawings]

First Light A block diagram of an image processing apparatus showing an embodiment of the present invention, FIG. 2 is a characteristic diagram showing shading correction according to the present invention, and FIG. 3 is a block diagram of a conventional image processing apparatus. In the figure, (5) is a scanning line counter, (6) is a ROM, +7
1 is an adder. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A television camera that inputs an image and outputs a video analog signal, an analog-to-digital converter that digitally converts the video analog signal output from the television camera into digital image data, and an image output from the television camera. a frame synchronization signal detection section that detects a frame synchronization signal from an analog signal, a scanning line synchronization signal detection section that detects a scanning line synchronization signal, and an image memory that stores image data output from the analog-digital conversion section; An image memory input/output control section that controls input/output of this image memory, a display interface that creates an image display signal from the image data output from the image memory, and an image display signal output from the display interface. a display to display;
A control signal generation unit that controls the hardware of the analog-to-digital conversion unit, image memory input/output control unit, and display interface, and a control signal generation unit that controls and manages each of the above units and processes and analyzes image data stored in the image memory. In an image processing apparatus, the image processing apparatus is equipped with a processor that performs the above-mentioned processing and an operation section that gives commands to the processor. a scanning line counter that is reset by a signal and detects the ranking of the scanning line in order to correct shading in which the level of the video analog signal of the television camera decreases linearly in accordance with the ranking of the scanning line; A ROM in which correction values are stored in advance so as to output a signal proportional to the order of the scanning lines output by the counter, and an adder for adding the output of the analog-to-digital converter and the output of the ROM are provided. An image processing device characterized by: