Image processing device and image processing method
View Patent ↗Provided is an image processing device including a selection section configured to select, from a plurality of transform units with different sizes, a transform unit used for inverse orthogonal transformation of image data to be decoded, a generation section configured to generate, from a first quantization matrix corresponding to a transform unit for a first size, a second quantization matrix corresponding to a transform unit for a second size from a first quantization matrix corresponding to a transform unit for a first size, and an inverse quantization section configured to inversely quantize transform coefficient data for the image data using the second quantization matrix generated by the generation section when the selection section selects the transform unit for the second size.
1. An image processing device comprising:
circuitry configured to:
decode encoded data of image data to generate quantized transform coefficient data; and
inversely quantize the quantized transform coefficient data for the image data using a 32×32 quantization matrix, the 32×32 quantization matrix set by performing a nearest neighboring process including duplicating at least one of two elements adjacent to each other in an 8×8 quantization matrix.
2. The image processing device according to claim 1 , wherein the 8×8 quantization matrix is a default quantization matrix.
3. The image processing device according to claim 1 , wherein the circuitry is configured to store the 8×8 quantization matrix.
4. The image processing device according to claim 1 , wherein the circuitry is configured to inversely quantize the quantized transform coefficient data for the image data using the 32×32 quantization matrix (QM1) set by performing the nearest neighboring process on the elements in the 8×8 quantization matrix (QM2):
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5. The image processing device according to claim 4 , wherein the circuitry is configured to set the 32×32 quantization matrix.
6. An image processing method comprising:
decoding encoded data of image data to generate quantized transform coefficient data; and
inversely quantizing, via circuitry of an image processing device, the quantized transform coefficient data for the image data using a 32×32 quantization matrix, the 32×32 quantization matrix set by performing a nearest neighboring process including duplicating at least one of two elements adjacent to each other in an 8×8 quantization matrix.
7. The image processing method according to claim 6 , wherein the 8×8 quantization matrix is a default quantization matrix.
8. The image processing method according to claim 6 , further comprising storing the 8×8 quantization matrix.
9. The image processing method according to claim 6 , wherein inversely quantizing includes inversely quantizing, via the circuitry, the quantized transform coefficient data for the image data using the 32×32 quantization matrix (QM1) set by performing the nearest neighboring process on the elements in the 8×8 quantization matrix (QM2):
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10. The image processing method according to claim 9 , further comprising setting, via the circuitry, the 32×32 quantization matrix.
11. A non-transitory computer readable medium storing instructions which when executed cause a computer to perform a method, the method comprising:
decoding encoded data of image data to generate quantized transform coefficient data; and
inversely quantizing the quantized transform coefficient data for the image data using a 32×32 quantization matrix, the 32×32 quantization matrix set by performing a nearest neighboring process including duplicating at least one of two elements adjacent to each other in an 8×8 quantization matrix.