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Apparatus and method for measuring resolution of CCD camera base on triangle direction discrimination

A technology of direction identification and resolution, applied in image communication, testing optical performance, television, etc.

Inactive Publication Date: 2009-01-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of the existing CCD camera resolution test target board, and design a special resolution test target that can eliminate the Moore effect, so as to improve the resolution measurement accuracy of the CCD camera

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  • Apparatus and method for measuring resolution of CCD camera base on triangle direction discrimination
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  • Apparatus and method for measuring resolution of CCD camera base on triangle direction discrimination

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Embodiment Construction

[0032] Taking the design of a D240 size target plate as an example, the specific implementation of the present invention will be described in conjunction with the accompanying drawings.

[0033] The device of the present invention includes a CCD camera to be tested, a resolution target board of 200-800TVL, a resolution target board of 225-775TVL, a uniform lighting light box and a high-resolution monitor, wherein the lighting light box is arranged on a triangular resolution test target board The rear of the target plate is evenly illuminated; the input end of the high-resolution image monitor is connected to the CCD camera to be tested to image the target plate for human observation and identification.

[0034] 1. Triangular resolution target design

[0035] The bottom plate size of the transmissive resolution target board is selected as the D240 standard in GB6996.1 "Transmissive TV Comprehensive Test Chart", that is (180×240mm 2 )Specification. Taking the side length of an...

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Abstract

The present invention relates to a CCD camera resolution measurement device based on triangle direction identification and a method thereof, belonging to the photoelectric test field. The device comprises a CCD camera to be measured, a resolution target, an even illumination lamp house and a high resolution monitor. The revolution target adopts an equilateral triangle pattern to substitute an ordinary grid pattern. In the test process, the identification of the orientation of the equilateral triangle substitutes the conventional fringe resolution so that the Morie fringe influence in the conventional grid pattern resolution test can be effectively avoided. The television line number corresponding to the correct decision probability higher than 75 percent is determined to be the limiting resolution of the camera. In order to improve the measuring accuracy, a value interpolation calculation is adopted for the standard grid interval so scheme out a novel television resolution target. The measurement accuracy can be largely improved by cooperating two targets. The method and the device can be applied to the performance evaluation of various visible light CCD cameras.

Description

technical field [0001] The invention belongs to the performance evaluation branch of a discrete photoelectric imaging system in the field of photoelectric testing. The system can effectively eliminate the influence of moiré fringes in conventional resolution testing and realize accurate measurement of the resolution of a CCD camera. It can be applied to the performance evaluation of various visible light CCD cameras. Background technique [0002] Resolution is the most important performance index of a TV camera, which represents the ability of the TV system to transmit details and directly affects the subjective clarity of the image. According to the provisions of GB12338-90 "Measurement Method of Black and White Universal Application TV Camera", the resolution is defined as: the ability to distinguish the minimum width of black and white lines for an image of a frame of equal width black and white lines. The maximum number of lines in each frame height identified on the co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00G01M11/02
Inventor 陈凌峰保玲张旭升周桃庚何川林家明沙定国
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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