Image Enhancement Using a Contrast measure in the Discrete Wavelet Transform
Ahmed Abdelwahab, Mohamed K. Ahmed, Somaya Hashem · 2007
In this paper, a new image enhancement technique based on a proposed contrast measure in the discrete wavelet transform is proposed. The contrast measure is defined as the ratio of high spatial-frequency content and low spatial-frequency content in the subbands of the discrete wavelet transform matrix. The obtained enhanced images from the proposed technique have better visual quality when compared with previous discrete cosine transform- based enhancement technique.