Image processing device and image processing method
An image processing device includes a buffer for receiving encoded image data, and a processor to execute instructions that cause the processor to: decode the encoded image data from the buffer to generate quantized transform coefficient data; inversely quantize the quantized transform coefficient data using a 16×16 quantization matrix to generate predicted error data, the 16×16 quantization matrix includes a duplicate of at least one of two elements adjacent to each other from an 8×8 quantization matrix; and combine the predicted error data with a predicted image to generate decoded image data.
1. An image processing device comprising:
a buffer for receiving encoded image data, and
a processor to execute instructions that cause the processor to:
decode the encoded image data from the buffer to generate quantized transform coefficient data;
inversely quantize the quantized transform coefficient data using a 16×16 quantization matrix to generate predicted error data, the 16×16 quantization matrix includes a duplicate of at least one of two elements adjacent to each other from an 8×8 quantization matrix; and
combine the predicted error data with a predicted image to generate decoded image data.
2. The image processing device according to claim 1 , further comprising a filter to filter the decoded image data.
3. The image processing device according to claim 1 , wherein the processor is configured to provide the decoded image data for storage in memory.
4. The image processing device according to claim 1 , wherein the processor is configured to provide the decoded image data for display.
5. The image processing device according to claim 1 , wherein the 8×8 quantization matrix is a default quantization matrix.
6. The image processing device according to claim 1 , wherein the processor is configured to store the 8×8 quantization matrix.
7. The image processing device according to claim 1 , wherein the processor is configured to generate the 16×16 quantization matrix by duplicating one of a first element and a second element adjacent to each other in the 8×8 quantization matrix as an element between the first element and the second element in the 16×16 quantization matrix.
8. The image processing device according to claim 1 , wherein the processor is configured to inversely quantize the quantized transform coefficient data using the 16×16 quantization matrix (QM1) set by performing a nearest neighboring process on the elements in the 8×8 quantization matrix (QM2):
QM
1
=
[
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]
QM
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=
(
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)
.
9. The image processing device according to claim 8 , wherein the processor is configured to set the 16×16 quantization matrix.
10. An image processing method comprising:
buffering in a buffer encoded image data;
decoding, by a decoder, the encoded image data to generate quantized transform coefficient data;
inversely quantizing, by processing circuitry, the quantized transform coefficient data using a 16×16 quantization matrix to generate predicted error data, the 16×16 quantization matrix includes duplicates of at least one of two elements adjacent to each other from an 8×8 quantization matrix; and
combining, by the processing circuitry, the predicted error data with a predicted image to generate a decoded image data.
11. The image processing method according to claim 10 , further comprising filtering the decoded image data.
12. The image processing method according to claim 10 , further comprising providing the decoded image data for storage in memory.
13. The image processing method according to claim 10 , further comprising providing the decoded image data for display.
14. The image processing method according to claim 10 , wherein the 8×8 quantization matrix is a default quantization matrix.
15. The image processing method according to claim 10 , further comprising storing the 8×8 quantization matrix.
16. The image processing method according to claim 10 , further comprising generating the 16×16 quantization matrix by duplicating one of a first element and a second element adjacent to each other in the 8×8 quantization matrix as an element between the first element and the second element in the 16×16 quantization matrix.
17. The image processing method according to claim 10 , wherein inversely quantizing includes inversely quantizing, by the processing circuitry, the quantized transform coefficient data using the 16×16 quantization matrix (QM1) set by performing the nearest neighboring process on the elements in the 8×8 quantization matrix (QM2):
QM
1
=
[
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]
QM
2
=
(
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18. The image processing method according to claim 17 , further comprising setting, by the processing circuity, the 16×16 quantization matrix.
19. A non-transitory, computer readable medium storing instructions which when executed cause a computer to perform a method, the method comprising:
buffering in a buffer encoded image data;
decoding the encoded image data to generate quantized transform coefficient data;
inversely quantizing the quantized transform coefficient data using a 16×16 quantization matrix to generate predicted error data, the 16×16 quantization matrix includes duplicates of at least one of two elements adjacent to each other from an 8×8 quantization matrix; and
combining the predicted error data with a predicted image to generate decoded image data.