A dynamic subfield coding(DSC) based on uniform sample and segmentation for valid gray scales is proposed to solve the problem of the lack of gray scale expression capability for static images in 'accumulation' lighting method.In this method,gray scales in isolated gray regions are sampled,then the gray scales left are segmented symmetrically and that with higher histogram can be sampled in each gray segmented region.The subfield weight is the difference of adjacent sampled gray scales.So the gray scales sa...