Scanning method and device, and reverse scanning method and device

摘要

A scanning method and device, and a reverse scanning method and device in coding and decoding technologies are provided. The scanning method includes: receiving quantized transformed coefficients of a current block; obtaining a prediction direction of the current block; finding, according to the prediction direction, a scanning order corresponding to the prediction direction of the current block from a mapping relationship table of the prediction direction and the scanning order, wherein at least one scanning order in the mapping relationship table of the prediction direction and the scanning order corresponds to at least two prediction directions; and performing scanning processing on the coefficients by using the scanning order corresponding to the prediction direction of the current block. With the solutions of the present invention, the number of the scanning orders used in coding and decoding is decreased, and system complexity of a codec system is reduced.

主权项

1. A scanning method comprising:
receiving a quantized transformed coefficient of a current block; obtaining a first prediction direction of the current block; determining a first scanning order using a mapping relationship table, wherein the mapping relationship table comprises the first prediction direction, a second prediction direction, a third prediction direction, a fourth prediction direction, the first scanning order, and a second scanning order, wherein the mapping relationship table indicates that the first scanning order is to be used with the first prediction direction and the second prediction direction, wherein the mapping relationship table indicates that the second scanning order is to be used with the third prediction direction and the fourth prediction direction, wherein the first prediction direction, the second prediction direction, the third prediction direction, and the fourth prediction direction are all different from one another, and wherein the first scanning order is different from the second scanning order, wherein the first scanning order comprises a00→a01→a02→a10→a11→a20→a03→a12→a21→a22→a13→a30→a31→a23→a32→a33 or a00→a01→a10→a02→a11→a20→a12→a21→a03→a22→a13→a30→a31→a23→a32→a33 or a00→a01→a02→a11→a02→a20→a21→a12→a22→a30→a03→a13→a31→a32→a23→a33, and wherein axy represents (x, y) position of a two-dimensional array a; and performing scanning processing on the coefficient using the first scanning order corresponding to the first prediction direction of the current block.