Video encoding device and video decoding device
A device is provided with: a first transformer which transforms an coding unit (CU); and a second transformer which transforms a part of first transform coefficients output from the first transformer, wherein the second transformer transforms at least any of the first transform coefficients for a region (first region) having different sizes in a horizontal direction and a vertical direction or the first transform coefficients for a non-rectangular region (second region).
1. A video decoding device for decoding a video, the video decoding device comprising:
a memory; and
a processor configured or programmed to execute instructions stored in the memory to:
decode coded data and output quantization transform coefficients;
perform an inverse quantization on the quantization transform coefficients and output secondary two-dimensional transform coefficients;
arrange at least a portion of the secondary two-dimensional transform coefficients into secondary one-dimensional transform coefficients;
perform an inverse secondary transform on the secondary one-dimensional transform coefficients and output primary one-dimensional inverse transform coefficients;
arrange the primary one-dimensional inverse transform coefficients into primary two-dimensional inverse transform coefficients; and
perform an inverse primary transform on the primary two-dimensional inverse transform coefficients, wherein,
if a width of a secondary two-dimensional transform coefficients block is less than a predefined value or a height of the secondary two-dimensional transform coefficients block is less than the predefined value, the primary one-dimensional inverse transform coefficients are stored in a squared region,
otherwise the primary one-dimensional inverse transform coefficients are stored in a non-squared region.
2. The video decoding device of claim 1 , wherein the non-squared region consists of a top left region, a top right region and a bottom left region of the primary two-dimensional inverse transform coefficients, a bottom right region of the primary two-dimensional inverse transform coefficients is equal to the secondary two-dimensional transform coefficients, each of the top left region, the top right region, the bottom left region and the bottom right region is an M1*M1 size block, and the M1 is a power of two.
3. The video decoding device of claim 1 , wherein the inverse secondary transform is a non-separable transform and the inverse primary transform is a separable transform.