In context of video coding (especially HEVC), what is difference between delta qp and simple qp values?
What do you mean by Simple QP? In HEVC(or any video codec for that matter), QP can be varied at various levels(frame level, slice level or block level). Delta QP comes into picture when QPs are varied at block level. For each block a differential QP is coded which is equal to (absolute QP of the current block - previously encoded QP) and this is called Delta QP. Hope this helps!