Can MPEG be used to code still frames ?
Yes. MPEG Intra pictures are similar to baseline sequential JPEG pictures. There are, of course, advantages and disadvantages to using MPEG over JPEG to represent still pictures. Disadvantages: 1.MPEG has only one color space (YCbCr) 2.MPEG-1 and MPEG-2 Main Profile luma and chroma share quanitzation and VLC tables (4:2:0 chroma_format) 3.MPEG-1 is syntactically limited to 4k x 4k images, and 16k x 16k for MPEG-2. Advantages: 1.MPEG possesses adaptive quantization which permits better rate control and spatial masking. 2.With its limited still image syntax, MPEG averts any temptation to use unnecessary, expensive, and academic encoding methods that have little impact on the overall picture quality (you know who you are). 3.Philips’ CD-I spec. has a requirement for a MPEG still frame mode, with double SIF image resolution. This is technically feasible mostly thanks to the fact that only one picture buffer is needed to decode a still image instead of the 2.5 to 3 buffers needed for IPB se
A. Yes. There are, of course, advantages and disadvantages to using MPEG over JPEG: Disadvantages: 1. MPEG has only one color space 2. MPEG-1 and MPEG-2 Main Profile luma and chroma share quanitzation and VLC tables 3. MPEG-1 is syntactically limited to 4k x 4k images, and 16k x 16k for MPEG-2. Advantages: 1. MPEG possesses adaptive quantization 2. With its limited still image syntax, MPEG averts any temptation to use unnecessary, expensive, and academic encoding methods that have little impact on the overall picture quality (you know who you are). Philips’ CD-I spec. has a requirement for a MPEG still frame mode, with double SIF image resolution. This is technically feasible mostly thanks to the fact that only one picture buffer is needed to decode a still image instead of three buffers.
