Apparatus and method for removing offset and shading from a vide

Details Apparatus and method for removing offset and shading from a vide Apparatus and method for removing offset and shading from a vide

1995-10-27

1999-02-02

Flynn, Nathan

Television

Monitoring, testing, or measuring

Testing of camera

H04N 1700

Patent

active

058672117

ABSTRACT:
An apparatus and method for removing offset and shading from a video signal include a filter that convolves the video signal with a second derivative. The derivative can include first and second non-zero values centered about a third non-zero value, zero-filling between the first and third values, and zero-filling between the second and third values. The filter can be applied to Modulation Transfer Function measurement of an electro-optical sensor, in which offset and shading are removed from the sensor's video signal prior to Fourier analysis. Filtering and Fourier analysis are performed by a digital signal processor, which allows the measurement to be fully automated.

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