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Proposed Algorithm for Image Enhancement in Frequency domain | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 12, Issue 2, 2008, Pages 63-72 | ||
| Author | ||
| Musa Hadi Wali | ||
| Abstract | ||
| This paper presents an algorithm for gray-scale image enhancement in frequency domain using Discrete Cosine Transform (DCT) depending on the definition of contrast measure in DCT domain. This algorithm introduces an efficient method for brightening darkened regions of images (which result from bad lighting scene) without saturation the normal regions. The proposed algorithm dividing the image into nonoverlapping (8×8 pixel) blocks, for each block, the enhancement factor is computed by using a proposed equation. The enhancement factor is varied according to the mean of the block. The blocks with low mean (dark blocks), get high enhancement factor while the brighten blocks get low enhancement factor. | ||
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