Reducing noise in an intraframe appearance cycle
The present disclosure relates to image processing devices and methods image processing devices and methods that can reduce noise that is recognized in synchronization with an intraframe appearance cycle. At time t 0 , the respective pixels are copied from the image that is output at the previous time, and only the pixels denoted by Δ among the pixels in a replacement pattern are replaced. At time t 1 , the respective pixels are copied from the image that is output at the previous time t 0 , and only the pixels denoted by X among the pixels in the replacement pattern are replaced. At this point, all the pixels in the image have been replaced with a decoded image. That is, by time t 1 , which is one time before the time when the decoded image is an intraframe, all the pixels in the image are replaced with the decoded image. The present disclosure can be applied to image processing devices, for example.
1. An image processing device, comprising:
one or more processors and one or more memories configured to:
decode a bit stream to generate a first image;
replace a pixel of the first image based on a replacement pattern that indicates a pixel value variation distribution;
clip a first coefficient by a clipping process, wherein the first coefficient is obtained by frequency transform on the first image having the pixel replaced, wherein the clipping process is based on a second coefficient and a quantization parameter obtained from the bit stream, and wherein the second coefficient is obtained by the frequency transform on the first image; and
reconstruct a second image from the first coefficient subjected to the clipping process.
2. The image processing device according to claim 1 , wherein the replacement pattern is randomly generated.
3. The image processing device according to claim 1 , wherein a cycle of the replacement pattern is determined based on an intraframe appearance cycle.
4. The image processing device according to claim 1 ,
wherein the one or more processors are further configured to smooth a flat portion of an integrated image by a smoothing process.
5. The image processing device according to claim 1 ,
wherein the one or more processors are further configured to generate the replacement pattern.
6. The image processing device according to claim 1 ,
wherein the one or more processors are further configured to:
receive the bit stream and the replacement pattern;
generate the first image; and
replace the pixel of the first image based on the received replacement pattern.
7. An image processing method, comprising:
decoding a bit stream for generating a first image;
replacing a pixel of the generated first image based on a replacement pattern indicating a pixel value variation distribution;
clipping a first coefficient by a clipping process, wherein the first coefficient is obtained by frequency transform on the first image having the pixel replaced, wherein the clipping process is based on a second coefficient and a quantization parameter obtained from the bit stream, and wherein the second coefficient is obtained by the frequency transform on the first image; and
reconstructing a second image from the first coefficient subjected to the clipping process.
8. An image processing device, comprising:
one or more processors and one or more memories configured to:
decode a bit stream to generate a first image;
set a replacement pattern that indicates a pixel value variation distribution, wherein the replacement pattern is used in replacement of a pixel of the first image;
generate the bit stream by an encoding process on the first image;
transmit the generated bit stream and the replacement pattern,
wherein a first coefficient is clipped by a clipping process, wherein the first coefficient is obtained frequency transform on the first image having the pixel replaced, wherein the clipping process is based on a second coefficient and a quantization parameter, and wherein the second coefficient is obtained by the frequency transform on the first image; and
reconstruct a second image from the first coefficient subjected to the clipping process.
9. An image processing method, comprising:
in an image processing device:
decoding a bit stream to generate a first image;
setting a replacement pattern indicating a pixel value variation distribution, wherein the replacement pattern is used in replacing the pixel of the first image;
generating the bit stream by an encoding process on the first image; and
transmitting the generated bit stream and the replacement pattern,
wherein the decoding of the bit stream comprising clipping a first coefficient by a clipping process, wherein the first coefficient is obtained by frequency transform on the first image having the pixel replaced, wherein the clipping process is based on a second coefficient and a quantization parameter, and wherein the second coefficient is obtained by the frequency transform on the first image; and
reconstructing a second image from the first coefficient subjected to the clipping process.