Residual transformation and inverse transformation in video coding systems and methods

A video-encoder-device-implemented method of encoding an unencoded video frame to generate an encoded bit-stream representative of the unencoded video frame, the encoded bit-stream including at least a frame header and a video data payload, the video-encoder-device-implemented method comprising:

• determining a maximum coding-block size for the unencoded video frame, said maximum coding-block size being defined by a maximum horizontal coding-block-dimension and a maximum vertical coding-block-dimension;
• determining a maximum-transform-block-size for the unencoded video frame, said maximum-transform-block-size being defined by a maximum horizontal prediction-block-dimension and a maximum vertical prediction-block-dimension;
• encoding the unencoded video frame, thereby generating the video data payload of the encoded bit-stream;
• generating the frame header of the encoded bit-stream, the frame header including a maximum coding-block size flag and a maximum-transform-block-size flag;
• and
• wherein, said maximum coding-block size flag is set to zero unless said maximum horizontal coding-block-dimension and said maximum vertical coding-block-dimension both equal sixty four pixels and said maximum-transform-block-size flag is set to zero unless said maximum horizontal prediction-block-dimension and said maximum vertical prediction-block-dimension are both greater than sixteen pixels.