Image processing device and method
AssigneeSony Corporation
InventorsJunichi Tanaka, Yoshitaka Morigami
Life of this patent
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Abstract
An image processing device and method that enable suppression of a reduction in coding efficiency. The image processing device encodes an image to generate encoded data, and set, as syntax of the generated encoded data, syntax whose semantics is set so that a default quantization matrix having the same size as a block size that is a unit of processing in which quantization is performed is referred to when in a copy mode in which a quantization matrix is copied, quantization matrix reference data identifying a reference destination of the quantization matrix matches quantization matrix identification data identifying the quantization matrix. The device and method can be applied to an image processing device.
Claims10
1-7. (canceled)
An image processing device comprising:
- an encoding unit configured to encode an image using a unit having a layered structure to generate encoded data;
- and
- a setting unit configured to set, as syntax of the encoded data generated by the encoding unit, syntax whose semantics is set so that a default quantization matrix having the same size as a block size that is a unit of processing in which quantization is performed is referred to when in a copy mode in which a quantization matrix is copied, a difference between quantization matrix reference data identifying a reference destination of the quantization matrix and quantization matrix identification data identifying the quantization matrix is equal to 0.
An image processing method comprising:
- encoding an image using a unit having a layered structure to generate encoded data;
- and
- setting, as syntax of the generated encoded data, syntax whose semantics is set so that a default quantization matrix having the same size as a block size that is a unit of processing in which quantization is performed is referred to when in a copy mode in which a quantization matrix is copied, a difference between quantization matrix reference data identifying a reference destination of the quantization matrix and quantization matrix identification data identifying the quantization matrix is equal to 0.
An image processing device comprising:
- a setting unit configured to set information concerning a replacement coefficient and information concerning a quantization matrix whose size is limited to not greater than a transmission size that is a maximum size allowed in transmission, the replacement coefficient being used to replace a coefficient located at the beginning of an up-converted quantization matrix which is obtained by up-converting the quantization matrix to the same size as a block size that is a unit of processing in which dequantization is performed;
- a quantization unit configured to quantize an image to generate quantized data;
- and
- a transmission unit configured to collectively transmit encoded data obtained by encoding the quantized data generated by the quantization unit, and the information
- concerning the replacement coefficient and the information concerning the quantization matrix which are set by the setting unit.
An image processing method comprising:
- setting information concerning a replacement coefficient and information concerning a quantization matrix whose size is limited to not greater than a transmission size that is a maximum size allowed in transmission, the replacement coefficient being used to replace a coefficient located at the beginning of an up-converted quantization matrix which is obtained by up-converting the quantization matrix to the same size as a block size that is a unit of processing in which dequantization is performed;
- quantizing an image to generate quantized data;
- and
- collectively transmitting encoded data obtained by encoding the generated quantized data, the set information concerning the replacement coefficient, and the set information concerning the quantization matrix.
Dependencies are inferred from the claim text.