| 摘要 |
An apparatus for encoding a moving picture by an inter-layer prediction coding determines, in a first encoding process for a first layer, whether the orthogonal transformation is applied to a first sub-block, based on a feature amount indicating a localization degree level of a pixel having a non-zero value in a prediction error signal. The apparatus generates, in the first encoding process, a local decoding picture by decoding the first sub-block based on a quantized coefficient obtained by quantizing either one of an orthogonal transformation coefficient or the prediction error signal, according to a result of the determining. The apparatus generates, in a second encoding process for a second layer, a second prediction block based in part on the local decoding picture. The apparatus applies the entropy encoding to a second prediction error signal between the second prediction block and a second block, to output an encoded bit stream. |
| 主权项 |
1. An apparatus for encoding a moving picture by an inter-layer prediction coding, the apparatus comprising:
a memory; and a processor coupled to the memory and configured to: execute a first encoding process for a first layer in the moving picture, the first encoding process including
a process for generating a prediction block for a first block, the first block being a part of a picture included in moving picture data, both of the prediction block and the first block having one or more of pixels,a process for calculating a prediction error signal between the prediction block and the first block,a process for calculating a feature amount indicating a localization degree level of a pixel having a non-zero value in the prediction error signal, for a first sub-block which is a part of the first block and is used for a unit of orthogonal transformation,a process for determining whether the orthogonal transformation is executed for the first sub-block in the first block, based at least in part on the feature amount,a process for generating a first local decoding picture by decoding the first sub-block based at least in part on a quantized coefficient which is obtained by quantizing either one of an orthogonal transformation coefficient or the prediction error signal in accordance with a result of the determining, the orthogonal transformation coefficient being obtained by applying the orthogonal transformation to the prediction error signal, anda process for performing entropy encoding of the quantized coefficient to output a first encoded bit stream; and execute a second encoding process for a second layer other than the first layer in the moving picture, the second encoding process including
a process for generating a second prediction block for a second block based at least in part on any of the first local decoding picture, the other picture encoded before the picture, and other block encoded before the second block, the second block being a part of the picture, the second block being a part of the picture included in moving picture data, both of the second prediction block and the second block having one or more of pixels, anda process for performing the entropy encoding of the prediction error signal between the second prediction block and the second block to output a second encoded bit stream. |
