Device and method for testing dynamic minimum resolvable contrast ratio of television sighting system

Abstract

The invention provides a dynamic minimum resolvable contrast test device and method for a television watching-aiming system. According to the device and method, the light cone angle of a light sourceentering an integrating sphere is controlled, so that the automatic and continuous adjustment of the output light intensity of the light source system can be realized, and a defect of failure to realize the precise and continuous adjustment of a target optical contrast variation range, which is brought by a voltage and optical device adjustment method, can be eliminated. According to the device and method of the invention, a discrete collimation system is adopted, and an off-axis parabolic mirror can be adopted in a matched manner according to the focal length of a camera under test, and therefore, a disadvantage that an integrated collimating lens is not replaceable and has poor matching performance can be eliminated; a system under test is arranged in a collimating optical system, so that an infinitely far low-contrast target is simulated; uniaxial rotation or precise vibration is generated on the basis of a dynamic simulation stage, so that various motion states can be simulated; and therefore, the dynamic minimum resolvable contrast measurement of the television watching-aiming system can be performed in a laboratory. When the dynamic simulation stage is immobile, the device and method also have a static MRC measurement function, so that the comparison of a dynamic MRC measurement result and a static MRC measurement result can be facilitated, and the degree of degradation of imaging quality introduced by motion can be quantitatively analyzed.

Description

technical field [0001] The invention relates to the field of optical metrology and measurement, in particular to a dynamic minimum resolvable contrast test device and method for a television viewing and aiming system. Background technique [0002] The TV sighting system is mainly used for the functions of searching, detecting, identifying and targeting the target. The quality of its performance is the key to determine the operating range and striking accuracy of the photoelectric imaging system. Therefore, it is necessary to accurately measure and evaluate the imaging performance of the TV sighting system. [0003] The minimum resolvable contrast (MRC-Minimum Resolvable Contrast) can quantitatively give the threshold contrast that the TV viewing system can distinguish. The ultimate performance of imaging systems. Therefore, MRC is an important indicator for evaluating the imaging performance of an imaging system. [0004] For the measurement of MRC, Chinese patent ZL 2014...

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that the brightness of the background is not controlled, it is difficult to simulate the actual situation where the target and the background are variable in practical situations, and the applicability range of the test system is small, which cannot meet the requirements of TV sighting systems, low-light cameras and other devices. testing requirements

[0006] (1) Since the target optical contrast is adjustable by adjusting the light source voltage and optical devices (such as attenuation sheets), the color temperature stability of the target source lacks an effective guarantee, and the variation range of the target optical contrast cannot be precisely and continuously adjusted

[0007] (2) Since the collimator lens is integrated on the background integrating sphere, only when the focal length of the camera under test and the collimator lens meet the appropriate magnification matching relationship can the test image with an appropriate scale be received on the monitor. If the focal length of the test camera does not meet the conditions, the test device must be redesigned and processed, which is time-consuming and laborious

In practical applications, most of the targets are in a moving state, and the TV sighting system is dominant in the measurement of dynamic targets. None of the test systems reported above can reflect the testing capabilities of the TV sighting system for dynamic targets.

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