Constrained Unsharp Masking for Image Enhancement
ICISP '08 Proceedings of the 3rd international conference on Image and Signal Processing
Combined de-noising and sharpening of color images in DCT domain
DSP'09 Proceedings of the 16th international conference on Digital Signal Processing
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This paper presents a new concept for improving video signals. Separating noise from the images while simultaneously sharpening these images is one key idea. The other key idea involves the serial combination of luminance transition improvement (LTI) and peaking in order to achieve the most pleasant impact on the human visual system. The different frequency channels of the video signal are thereby processed in different ways. New algorithms are presented, including LTI, contrast adaptive peaking in the case of the luminance, and chrominance transition improvement (CTI) in the case of the color components. In the case of the luminance, the LTI is used as preprocessing step for the subsequent contrast adaptive peaking. The whole image improvement concept, including all its components is to be produced as the display processor part of a new chip for double scan TV applications