Method and system for measuring modulation transfer function of digital input equipment

Method and system for measuring modulation transfer function of digital input equipment

The invention provides a method for measuring a modulation transfer function of digital input equipment. The method comprises the following steps: acquiring an image obtained by photographing a preset test card by a camera to be tested; selecting a blade edge area from the acquired image; on the bas...

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Hauptverfasser: CAI QIBO, NIE SAISAI, LU WEIKUAN, JIANG YISHAN, RUAN XIUKAI, CUI GUIHUA
Format: Patent
Sprache:chi ; eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
MEASURING
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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creator CAI QIBO
NIE SAISAI
LU WEIKUAN
JIANG YISHAN
RUAN XIUKAI
CUI GUIHUA
description The invention provides a method for measuring a modulation transfer function of digital input equipment. The method comprises the following steps: acquiring an image obtained by photographing a preset test card by a camera to be tested; selecting a blade edge area from the acquired image; on the basis of a preset inclined edge method, calculating the selected edge region to obtain an MTF (Modulation Transfer Function) value; if it is judged that the MTF value is larger than the preset threshold value, a preset filter is adopted to conduct multiple times of filtering on the selected blade edge area till the MTF value obtained by recalculating the blade edge area after a certain time of filtering is smaller than the preset threshold value; and outputting the MTF value smaller than the preset threshold value as the MTF value finally measured by the camera to be measured. The invention also provides a system for measuring the modulation transfer function of the digital input equipment. By implementing the method,
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The method comprises the following steps: acquiring an image obtained by photographing a preset test card by a camera to be tested; selecting a blade edge area from the acquired image; on the basis of a preset inclined edge method, calculating the selected edge region to obtain an MTF (Modulation Transfer Function) value; if it is judged that the MTF value is larger than the preset threshold value, a preset filter is adopted to conduct multiple times of filtering on the selected blade edge area till the MTF value obtained by recalculating the blade edge area after a certain time of filtering is smaller than the preset threshold value; and outputting the MTF value smaller than the preset threshold value as the MTF value finally measured by the camera to be measured. The invention also provides a system for measuring the modulation transfer function of the digital input equipment. 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subjects CALCULATING
COMPUTING
COUNTING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
MEASURING
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
title Method and system for measuring modulation transfer function of digital input equipment
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