Image Processing Device and Method
The present invention relates to an image processing device and method enabling noise removal to be performed according to images and bit rates. A low-pass filter setting unit 93 sets, from filter coefficients stored in a built-in filter coefficient memory 94 , a filter coefficient corresponding to intra prediction mode information and a quantization parameter. A neighboring image setting unit 81 uses the filter coefficient set by the low-pass filter setting unit 93 to subject neighboring pixel values of a current block from frame memory 72 to filtering processing. A prediction image generating unit 82 performs intra prediction using the neighboring pixel values subjected to filtering processing, from the neighboring image setting unit 81 , and generates a prediction image. The present invention can be applied to an image encoding device which encodes with the H.264/AVC format, for example.
1 . An image encoding method, comprising:
determining an intra prediction mode of a block to be encoded;
determining a block-level control flag value for the intra prediction mode of the block, wherein the block-level control flag value indicates whether filter processing is to be turned on or off as to neighboring pixels that are located adjacent to the block and not included within the block; and
in response to the block-level control flag value indicating the filter process is to be turned on:
filtering the neighboring pixels; and
generating a prediction image for the block using the intra prediction mode and the filtered neighboring pixels, wherein the filtered neighboring pixels are used as reference pixels to generate the prediction image.
2 . The image encoding method according to claim 1 , wherein the block-level control flag value is determined in increments of a block size of the block, wherein the size of the block is selected from a predetermined set of sizes of 4×4, 8×8, 16×16, and 32×32.
3 . The image encoding method according to claim 2 , further comprising setting filter coefficients according to the block size of the block.
4 . An image processing apparatus comprising:
a processor; and
a memory storing instructions which when executed by the processor, cause the image processing apparatus to:
determine an intra prediction mode of a block to be encoded;
determine a block-level control flag value for the intra prediction mode of the block, wherein the block-level control flag value indicates whether filter processing is to be turned on or off as to neighboring pixels that are located adjacent to the block and not included within the block; and
when the block-level control flag value indicates the filter process is to be turned on:
filter the neighboring pixels; and
generate a prediction image for the block using the intra prediction mode and the filtered neighboring pixels, wherein the filtered neighboring pixels are used as reference pixels to generate the prediction image.
5 . The image processing apparatus according to claim 4 , wherein the block-level control flag value is determined in increments of a block size of the block, wherein the size of the block is selected from a predetermined set of sizes of 4×4, 8×8, 16×16, and 32×32.
6 . The image processing apparatus according to claim 5 , wherein the instructions when executed by the processor, further cause the image processing apparatus to: set filter coefficients according to the block size of the block.
7 . A non-transitory computer-readable medium comprising computer instructions, which when executed by a processor causes a device to perform:
determining an intra prediction mode of a block to be encoded;
determining a block-level control flag value for the intra prediction mode of the block, wherein the block-level control flag value indicates whether filter processing is to be turned on or off as to neighboring pixels that are located adjacent to the block and not included within the block; and
in response to the block-level control flag value indicating the filter process is to be turned on:
filtering the neighboring pixels; and
generating a prediction image for the block using the intra prediction mode and the filtered neighboring pixels, wherein the filtered neighboring pixels are used as reference pixels to generate the prediction image.
8 . The non-transitory computer-readable medium according to claim 7 , wherein the block-level control flag value is determined in increments of a block size of the block, wherein the size of the block is selected from a predetermined set of sizes of 4×4, 8×8, 16×16, and 32×32.
9 . The non-transitory computer-readable medium according to claim 8 , further comprising instructions which when executed by the processor, cause the device to perform: setting filter coefficients according to the block size of the block.