| 摘要 |
<p>A B S T R A C T An image encoding method comprising: predicting a prediction error of a target image to be encoded based on an intra-prediction mode; setting both of a vertical transform 5 matrix and a horizontal transform matrix for the target image to a first transform matrix or a second transform matrix based on a predetermined relation; transforming the prediction error using the first transform matrix as both of the vertical transform matrix and the horizontal transform 0 matrix to obtain first transform coefficients when the first transform matrix are set for both of the vertical transform matrix and the horizontal transform matrix; transforming the prediction error using the second transform matrix as both of the vertical transform matrix and the horizontal 5 transform matrix to obtain second transform coefficients when the second transform matrix are set for both of the vertical transform matrix and the horizontal transform matrix; and encoding the first or second transform coefficients and information indicating the intra-prediction O mode for the target image, and wherein when the intra prediction mode for the target image is one of Diagonal down right, Vertical right and Horizontal down, the second transform matrix are set for both of the vertical transform matrix and the horizontal transform matrix for the target 25 image. Process of encoding S601 pixel block Generate predicted S602 image using reference image II Generate 8605 Generate prediction 3603 prediction error information K Extract prediction '8606 S604 mode information Intra-prediction yes Generate 1D transform S607 No matrix set information Generate prediction error S608 Set 1 D transform No matrix A for vertical orthogonal transformation S609 ?S610 Yes Set 1 D orthogonal Set 1D orthogonal transformation A for transformation B for vertical ortogonal vertcal orthogonal transformation transformation Set 1D transform matrix >No A for hordzontal orthogonal transformation Set 1 D transform Set 1 D transform matri x A fo r h orizo ntalI matrix B for horizontal orthogonal transformation orthogonal transformation S614' I Y Y' Carry out orthogonal Carry out orthogonal transformation to generate transformation to generate ~S614 transform coefficient transform coefficient</p> |
