Gray-scale resolution enhancement

The number of bits assigned to represent the color intensity at image pixels is usually referred as the bit depth. When the bit depth is not sufficient, images suffer from ridge-like structures known as false contours. Bit-depth limitations become important when low-contrast details are required, as in medical imaging, aerial/satellite photography, and high-quality scanning: applications. In this paper, we investigate a method for increasing bit depth. Specifically, we show that when a sequence of video frames is available, then it is possible to achieve a higher bit depth through a projections onto convex sets (POCS) based reconstruction method.