Image inspection methods and apparatus

Details Image inspection methods and apparatus Image inspection methods and apparatus

1991-06-21

1993-05-04

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 1, 382 8, 382 27, G06K 900

Patent

active

052088707

ABSTRACT:
An image is tested to determine whether it is substantially like a plurality of sample images by computing statistical information about the sample images and using that statistical information to analyze the image being tested. The analysis is such that the statistical parameters are standardized so that available tables of the central chi-square distribution function can be used, thereby simplifying the necessary calculations. If desired, images which have been determined by the method of this invention to be good can be used to refine the statistical information used in analyzing subsequent images. When an image is identified as unacceptable by the method of the invention, the data for that image can be decomposed in order to identify the parts of the image which are causing the image to be unacceptable.

REFERENCES:
patent: 4053056 (1977-10-01), Day
patent: 4912554 (1990-03-01), Neri
patent: 4965840 (1990-10-01), Subbarao
patent: 4972494 (1990-11-01), White et al.
patent: 5046111 (1991-09-01), Cox et al.

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