Pixel data compression and decompression method
A pixel data decompression method for decompressing a frame is provided. The method includes: loading memory storage addresses corresponding to to-be-decompressed blocks; reading and decompressing a pixel line of a current block according to a memory storage address of the current block; updating the memory storage address of the current block according to a decompression result; reading a memory storage address of a next block if decompression of a pixel line of the frame is not completed; and repeating the above steps until decompression of the frame is completed.
1. A pixel data decompression method, applicable to an image processing device, for decompressing a frame, the pixel data decompression method comprising:
(a) setting a parameter N;
(b) loading a line start array comprising a plurality of memory address fields corresponding to a plurality of to-be-decompressed blocks of the frame;
(c) reading a memory address field of a current block from the line start array;
(d) reading and decompressing an i th pixel line of the current block according to the memory address field of the current block, wherein the i th pixel line of the current block comprises a portion of an N th pixel line of the frame, and i is 0 or a positive integer;
(e) updating the memory address field of the current block of the line start array as a memory storage address of an (i+p) th pixel line of the current block, wherein p is a positive integer;
(f) reading a memory address field of a next block from the line start array if compression of the N th pixel line of the frame is not completed;
(g) repeating the above steps (d)˜(f) until decompression of the N th pixel line of the frame is completed;
(h) updating the parameter N; and
(i) repeating the above steps (b)˜(h) until decompression of the frame is completed.
2. The method according to claim 1 , wherein, the step (a) comprises:
setting an initial value of the parameter N.
3. The method according to claim 1 , wherein, the step (b) comprises:
loading a plurality of memory storage address corresponding to the blocks to the line start array from a block random access table.
4. The method according to claim 3 , wherein, the memory storage address corresponding to the to-be-decompressed block is a memory storage address for addressing a starting pixel data of the to-be-decompressed block.
5. The method according to claim 1 , wherein, the memory storage address of the (i+p) th pixel line of the current block is obtained after the i th pixel line of the current block is decompressed.
6. A pixel data compression and decompression method, applicable to an image processing device, for compressing and decompressing a frame, the pixel data compression and decompression method comprising:
in compressing the frame, performing the following steps:
(1a) recording a memory storage address for addressing a compressed block of the frame;
(1b) compressing the block line by line and storing the compressed block according to the memory storage address; and
(1c) repeating the above steps until compression of the frame is completed; and
in decompressing the frame, performing the following steps:
(2a) setting a parameter N;
(2b) loading a line start array comprising a plurality of memory address fields corresponding to a plurality of to-be-decompressed blocks of the frame;
(2c) reading a memory address field of a current block from the line start array;
(2d) reading and decompressing an i th pixel line of the current block according to the memory address field of the current block, wherein the i th pixel line of the current block comprises a portion of an N th pixel line of the frame, and i is 0 or a positive integer;
(2e) updating the memory address field of the current block of the line start array as a memory storage address of an (i+p) th pixel line of the current block, wherein p is a positive integer;
(2f) reading a memory address field of a next block from the line start array if compression of the N th pixel line of the frame is not completed;
(2g) repeating the above steps (2d)˜(2f) until decompression of the N th pixel line of the frame is completed;
(2h) updating the parameter N; and
(2i) repeating the above steps (2b)˜(2h) until decompression of the frame is completed.
7. The method according to claim 6 , wherein, the step (1a) comprises:
recording a memory storage address for addressing a starting pixel data of the compressed block as the memory storage address of the block.
8. The method according to claim 6 , wherein, the step (1b) comprises:
compressing a current pixel line; and
compressing a next pixel line until a last pixel line is compressed.
9. The method according to claim 6 , wherein, the step (2a) comprises:
setting an initial value of the parameter N.
10. The method according to claim 6 , wherein, the step (2b) comprises:
loading a plurality of memory storage addresses corresponding to the blocks to the line start array from a block random access table.
11. The method according to claim 10 , wherein, in the step (2b), the memory storage address corresponding to the to-be-decompressed block is a memory storage address for addressing a starting pixel data of the to-be-decompressed block.
12. The method according to claim 6 , wherein, the memory storage address of the (i+p) th pixel line of the current block is obtained after the i th pixel line of the current block is decompressed.