Image processing method in wireless channel environment
A method of image processing in wireless channel environment comprises steps of: dividing a frame of content image data into multiple blocks defined by a line; wirelessly transmitting the multiple blocks per line by coding channels in channel coding units by defining a transmission code rate according to a wireless channel environment information; determining whether there is a channel error for each block after decoding a received data; extracting an information of an image of an errored block; determining an image error correction method suitable for the extracted information; replacing the errored block with an error-corrected block according to the determined image correction method; and performing a post processing process to eliminate visual unnaturalness between the replaced block and a neighboring block at a block boundary.
1. A method of image processing in wireless channel environment comprising:
dividing a frame of content image data into multiple blocks defined by a line;
forming multiple blocks per line according to wireless channel environment information, and wirelessly transmitting by channel coding in channel coding units based on a defined transmission code rate;
determining whether there is a channel error for each block after channel decoding received data;
extracting information from an image of an errored block;
determining an image error correction method suitable for the extracted information;
replacing the errored block with an error-corrected block according to the determined image error correction method; and
performing a post processing process to eliminate visual unnaturalness between the error-corrected block and a neighboring block at a block boundary,
wherein, in case of a content image based on user motion and head tracking information, the image error correction method comprises:
acquiring information on a position of an error block in a current frame and a number of error blocks;
detecting a current user motion and head tracking information;
calculating a position of a block in a previous frame for a current error block to obtain image information as many as the number of blocks; and
replacing the current error block with the block in a previous frame.
2. The method of claim 1 , wherein the current user motion and the head tracking information are detected from a motion sensor in a receiver or a display.
3. The method of claim 1 , wherein the content images with the image information on a moving speed and a moving direction of images in frames, lines, or blocks are coded.
4. The method of claim 1 , wherein the image error correction method based on a moving speed and a moving direction of an image is corrected using blocks and lines of a previous frame in which the moving speed and moving direction information are reflected.
5. The method of claim 1 , wherein a coded channel unit is determined by any one of at least one block and at least one line according to a wireless channel environment.
6. The method of claim 1 , wherein a channel coding unit varies depending on a type of content as well as environment.
7. The method of claim 1 , wherein blocks per line, a data transmission rate, and a code rate are defined according to a content type, a moving degree of an image, and an environment.
8. The method of claim 1 , wherein, in case of no information on a moving speed and a moving direction of a current error block, the image error correction method is configured to replace with the same position block on a top or bottom line of a current frame, rather than the block on the same position of a previous frame of an error image block.
9. The method of claim 1 , when a number of lines in which an error occurs in the current frame exceeds a predetermined threshold, the image error correction method replaces data in units of frames.