Image spot detector using Haar coefficients

Details Image spot detector using Haar coefficients Image spot detector using Haar coefficients

1979-08-27

1980-12-30

Smith, Jerry

Boots, shoes, and leggings

358133, 358260, 364725, H04N 712, G06F 15332

Patent

active

042427339

ABSTRACT:
A machine for detecting image spots in two-dimensional images. The machine transforms two-dimensional images by means of the Haar transform into the two-dimensional Haar transform domain and calculates a "double difference" between each Haar transform coefficient and the adjacent coefficients in the immediately preceding rows and columns. For certain of these "double differences" which are sensitive to spots, the invention outputs a spot indication and address whenever the absolute magnitude of the "double difference" exceeds a threshold.

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