Real-Time Digital Image Filtering And Shading Correction

Roger C. Dahlberg

doi:10.1117/12.958231

28 December 1979 Real-Time Digital Image Filtering And Shading Correction

Roger C. Dahlberg

Proceedings Volume 0207, Applications of Digital Image Processing III; (1979) https://doi.org/10.1117/12.958231
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

Abstract

A system has been designed to filter a television image in real-time or near real-time for the purpose of enhancing high spatial frequencies and attenuating low spatial frequencies. The system makes innovative use of a two-dimensional linear filter, coded memories, and high speed digital multipliers to provide powerful linear and homomorphic image filtration. The architecture is useful in correcting and compensating linear and multiplicative shading, a common artifact in television images. The filter can also be used to extract the very low spatial frequencies generally associated with illumination. Real time filtration helps overcome the dynamic range limitations of most television systems by redistributing the image power spectrum for optimum viewing of edge information.

Citation Download Citation

Roger C. Dahlberg "Real-Time Digital Image Filtering And Shading Correction", Proc. SPIE 0207, Applications of Digital Image Processing III, (28 December 1979); https://doi.org/10.1117/12.958231

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