Line contrast difference effect correction for laser line scan d

Details Line contrast difference effect correction for laser line scan d Line contrast difference effect correction for laser line scan d

1998-04-27

2000-08-22

Rogers, Scott

Image analysis

Image enhancement or restoration

Focus measuring or adjusting

382264, 382275, G06K 944

Patent

active

061084549

ABSTRACT:
Line contrast difference effect which limits the capabilities of laser line scan (LLS) sensors is substantially reduced by a process that uses a smhing array, modified based upon a mean magnitude array of all columns of a discrete Fourier transform (DFT) of an image matrix. Trouble frequencies (both small band width and large band width) indicative of line contrast difference effect are identified from the mean magnitude DFT array using a linear least squares error method. The same technique is used to calculate suppression values for each of the identifiable trouble frequencies and the smoothing array is modified thereby. Once all modifications are made to the smoothing array, it is applied to the mean magnitude DFT array to suppress those pixels of the array that are associated with trouble frequencies. The corrected mean magnitude DFT array is then subject to an inverse DFT function for each column in the array to reconstruct the original image, now in corrected form, to be saved for display or storage.

REFERENCES:
patent: 4234880 (1980-11-01), Klemm
patent: 4897878 (1990-01-01), Boll et al.
patent: 5466882 (1995-11-01), Lee

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