Device and method for testing modulation transfer function of television imaging system

Abstract

The invention provides a television imaging system modulation transfer function test device and method and belongs to the technical field of optical measurement. The television imaging system modulation transfer function test device and method are characterized in that a television imaging system to be tested is placed in an optical collimation system illuminated by an integrating sphere light source, of which the light intensity is adjustable and which is high in space uniformity, and slit targets are arranged in the focal plane of the optical collimation system; the slit targets, after passing through the optical collimation system and the television imaging system to be tested, are imaged to a target surface of the television imaging system; and after an image recording and processing system carries out a series of calculation and processing on the slit images, line spread function distribution of the slit targets and the MTF value are obtained, and thus MTF measurement of the television imaging system is finished.

Description

technical field [0001] The invention relates to the field of optical metrology and measurement, in particular to a modulation transfer function testing device and method for a television imaging system. Background technique [0002] Modulation transfer function (MTF) is one of the most basic evaluation parameters of imaging system performance, which reflects the response characteristics of the imaging system to the spatial frequency components in the scene, and reflects the imaging system's ability to transmit the target contrast of different spatial frequencies, so MTF It is an important index to evaluate the imaging performance of the imaging system. [0003] Visible light television imaging and sighting system is responsible for searching, tracking and aiming at the target. Its imaging performance is the key to determine the system's working distance and tracking accuracy. Therefore, it is necessary to accurately measure and evaluate the imaging performance of the televis...

AI Technical Summary

Problems solved by technology

[0006] In practice, due to the uneven spatial distribution of the intensity of the lighting source in the MTF test device of the TV imaging system, the intensity is not stable, and the characteristics of the TV imaging system itself, such as the receiver is a discrete device with different gray dynamic ranges, and the device has random Noise, etc., will affect the gray level distribution of the image surface image of the CCD device and the interpretation of the line spread function, etc., and ultimately affect the MTF measurement results

Images