| 主权项 |
1. A method, performed by a decoder, for determining a prediction mode parameter in a digital image decoding process, the method comprising:
receiving a digital image comprising a plurality of macroblocks; retrieving a first macroblock comprising M×N blocks K11 through Kmn; performing a first operation on M blocks K11 through Km1 of the M×N blocks K11 through Kmn along a first edge in a first direction to obtain corresponding M first parameters A11 through Am1, wherein while performing the first operation, a first set of conditions are taken in consideration for judgment as whether a neighboring macroblock A next to the first edge of the first macroblock exists, the macroblock A exists but whether there is an inter-MB and a constrained intra prediction flag corresponding to the M blocks is 1, and the macroblock A exists but whether there is neither intra-4×4 nor intra-8×8 MB; performing a second logic operation on N blocks K11 through K1n of the M×N blocks K11 through Kmn along a second edge in a second direction to obtain corresponding N second parameters B11 through B1n, wherein while performing the second operation, a second set of conditions are taken in consideration for judgment as whether a neighboring macroblock B next to the second edge of the first macroblock exists, the macroblock B exists but whether there is an inter-MB and a constrained intra prediction flag corresponding to the N blocks is 1, and the macroblock B exists but whether there is neither intra-4×4 nor intra-8×8 MB; performing a third logic operation on blocks K11, K21 through Km1 and K12 through K1n of the M×N blocks K11 through Kmn referencing the parameters A11 through Am1 and B11 through B1n to obtain prediction mode parameters-corresponding to blocks K11, K21 through Km1 and K12 through K1n, and thereby the prediction mode parameters corresponding to blocks K11, K21 through Km1 and K12 through K1n are obtained by taking the first and second sets of conditions in consideration for judgment; and performing the third logic operation on the remaining blocks of the M×N blocks K11 through Kmn of the first macroblock directly referencing the prediction mode parameters corresponding to blocks K21 through Km1 and K12 through K1n to obtain respective prediction mode parameters of the remaining blocks, and thereby the prediction mode parameters of the remaining blocks are obtained without the need of taking the first and second sets of conditions in consideration for judgment. |
