CN109862366B - Image compression method and image processing system - Google Patents
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Abstract
The invention provides an image compression method and an image processing system. The image compression method comprises the following steps: receiving an input image through a tile division generator; judging whether the input image corresponds to a local updating area and is superposed with a block or a combination of a plurality of blocks of a current frame through the block division generator, and generating a judgment result; and determining whether to re-partition the tile and re-compress and encode a portion of the current frame by the tile partition generator according to the determination result. The hardware module of the invention has simple design, small number of used gate circuits and low power consumption, and is suitable for various panel driving chips.
Description
Technical Field
The invention relates to an image compression method and an image processing system.
Background
Since the panel driving chip itself has the features of low cost and low power consumption, in order to reduce the cost of the frame buffer, the input image is usually compressed to save the storage space of the input image. The existing block-based compression technology can be divided into two types, the first type is based on blocks with fixed size (as shown in fig. 1A, the area 110 corresponds to one block, the image 100a is divided into 8 blocks, and the local update area 150 is located in the 1 st to 3 rd blocks), and its features include high correlation between pixels, large compression ratio, and better image quality under the same compression ratio. However, this compression technique is less flexible for local updates, especially if the region of local updates spans multiple tiles or is narrow in width. The second is based on the fact that the tiles have a fixed small size (as shown in fig. 1B, the area 120 corresponds to a tile, i.e., the image 100a is divided into 192 tiles, and the size of the tile 120 is significantly smaller than that of the tile 110 compared to the tile 110 in fig. 1A), which has the advantages of better flexibility and better support for local update. However, this compression technique has poor correlation between primitives, a low compression rate, and subjectively noticeable picture distortion. Therefore, it is a problem to be solved to provide a better compression rate and maintain a certain degree of flexibility in the case that the input end only provides the input image corresponding to the local update region.
Disclosure of Invention
An embodiment of the present invention provides an image compression method, including: receiving an input image through a block divider; judging whether the input image corresponds to a local updating area and is overlapped with a block of a current frame or a combination of a plurality of blocks by a block division generator, and generating a judgment result; and determining whether to re-partition the tile and re-compress and encode a portion of the current frame by the tile partition generator according to the determination result.
Another embodiment of the present invention further provides an image processing system, which includes a tile division generator, an encoder, a frame buffer, and a decoder. The tile division generator is used for receiving an input image, judging whether the input image corresponds to a local updating area, judging whether the input image is superposed with a tile or a combination of a plurality of tiles of a current frame under the condition that the input image corresponds to the local updating area, generating a judgment result, and determining whether to divide the tiles again according to the judgment result.
According to an embodiment of the present invention, in response to the input image corresponding to a local update region and the local update region overlapping with the tile or the combination of the tiles of the current frame, the encoder further compresses and encodes the input image corresponding to the local update region to generate image data corresponding to the local update region, and stores the image data corresponding to the local update region in the frame buffer.
According to another embodiment of the present invention, the tile division generator further obtains location information corresponding to an un-updated region according to the location information corresponding to the locally updated region to output a locally updated signal to the decoder, the decoder further accesses the image information corresponding to the un-updated region from a frame buffer according to the locally updated signal and stores the image information corresponding to the un-updated region in the frame buffer, and the decoder further outputs a next frame according to the image data corresponding to the locally updated region and the image information corresponding to the un-updated region.
According to another embodiment of the present invention, in response to the input image corresponding to the local update region, but the local update region is not overlapped with the tile or the combination of the tiles of the current frame, the tile division generator further re-divides the tiles according to the size of the local update region so that the tiles coincide with the local update region, obtains location information corresponding to an un-updated region according to the location information corresponding to the local update region, to output a local update signal to the decoder, the decoder further accesses image information corresponding to the non-updated region from the frame buffer according to the local update signal, and the encoder further compresses and encodes the input image corresponding to the locally updated region and the image information corresponding to the non-updated region, to generate image data corresponding to a next frame and store the image data corresponding to the next frame into the frame buffer.
According to another embodiment of the present invention, in response to the input image corresponding to a full image, the tile dividing generator further configures the size of the tiles to be the same as the size of the full image, and the encoder further compresses and encodes the full image to obtain image data corresponding to a next frame and stores the image data corresponding to the next frame in a frame buffer.
The hardware module of the invention has simple design, small number of used gate circuits and low power consumption, and is suitable for various panel driving chips.
Drawings
Fig. 1A and 1B are schematic diagrams illustrating a prior art tile division.
FIG. 2 is a block diagram of an image processing system according to an embodiment of the invention.
FIGS. 3A-3C are schematic diagrams illustrating tile partitioning according to an embodiment of the invention.
FIGS. 4A and 4B are flow charts illustrating an image compression method according to another embodiment of the present invention.
FIG. 5 is a block diagram of an image processing system according to another embodiment of the invention.
FIG. 6 is a diagram illustrating tile partitioning according to another embodiment of the present invention.
FIG. 7 is a flowchart illustrating an image compression method according to another embodiment of the present invention.
Wherein the symbols in the drawings are briefly described as follows: 100. 500-image processing system; 110-block division generator; 120. 510, an encoder; 130. 520-frame buffer; 140. 530 to a decoder; 511-a multiplexer; 512-coding core; 531-main decoding core; 532-cooperative decoding core; 600-inputting an image; 610-620-pattern blocks; 622-local update area; s401 to S413, S701 to S705.
Detailed Description
The following description is of the preferred embodiment of the invention and is intended to describe the general principles of the invention and not to limit the invention. Actual summary must be referenced to the scope of the claims.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of further features, integers, steps, operations, elements, components, and/or groups thereof.
Fig. 2 is a block diagram of an image processing system according to an embodiment of the invention. As shown in fig. 2, the image processing system 100 at least includes a tile division generator 110, an encoder 120, a frame buffer 130, and a decoder 140. The tile division generator 110 is configured to receive an input image from an Operating System (OS), and determine whether a portion of image information (e.g., pixel values, etc.) corresponding to a current image needs to be accessed from the frame buffer 130 according to a type of the input image, so as to generate image information corresponding to a next frame. The image type output by the operating system includes a complete image corresponding to the entire frame or an image corresponding to only a local update area. And when the input image is the image corresponding to the local updating area, the operating system also outputs the position information corresponding to the local updating area. The encoder 120 is used for compressing and encoding the image information output by the tile division generator 110, and storing the compressed and encoded image information into the frame buffer 130. The decoder 140 is used for accessing the image data corresponding to the next frame from the frame buffer 130 and decoding the image data to display the image corresponding to the next frame on a display (not shown). In addition, in response to the input image being an image corresponding to a local updated region, the decoder 140 further receives the position information corresponding to the local updated region from the tile division generator 110, and obtains the position information corresponding to the non-updated region according to the position information, so as to decode the image information corresponding to the non-updated region and transmit the image information back to the tile division generator 110. It is noted that the image processing system 100 may also include other components, and the configuration of the components may vary from system to system and may be presented in a variety of different ways, not limited to the example of fig. 2. Further, the tile division generator 110 may be implemented by a logic circuit.
In response to the input image received by the tile division generator 110 being a full image, the tile division generator 110 configures the size of the tiles to be the same as the size of the full image, and outputs the input image to the encoder 120. Then, the encoder 120 compresses and encodes the input image to generate image data corresponding to the input image, and stores the image data in the frame buffer 130. Finally, the decoder 140 decodes the image data stored in the frame buffer 130 to obtain the image information corresponding to the next frame when displaying the image corresponding to the next frame.
According to another embodiment of the present invention, in response to the input image received by the tile division generator 110 corresponding to the locally updated region and the locally updated region overlapping the current frame divided tile or the combination of the plurality of tiles, the tile division generator 110 transmits the position information corresponding to the locally updated region to the decoder 140, so that the decoder 140 can calculate the position information corresponding to the un-updated region according to the position information corresponding to the locally updated region, so as to access the image data corresponding to the un-updated region from the frame buffer 130 and decode the image data. Then, the decoder 140 transmits the decoded image information corresponding to the non-updated region back to the tile division generator 110, so that the tile division generator 110 can combine the image information corresponding to the non-updated region and the image information of the input image into image information corresponding to the next frame, and store the image information in the frame buffer 130. Since the image information corresponding to the local update area is different from the image information of the previous frame, the encoder 120 recompresses and encodes the input image. In addition, since the image information corresponding to the non-updated area is the same as the image information of the previous frame, i.e., the correlation between the pixels is not changed during encoding, the encoder 120 does not need to re-encode the non-updated area to increase the efficiency of image compression.
According to another embodiment of the present invention, in response to the input image corresponding to the local update region and the local update region not overlapping with the current frame divided tile or the combination of the plurality of tiles, the tile divider 110 divides the tiles again according to the size and the position of the local update region. For example, as shown in fig. 3A, in the image corresponding to the current frame, the tile division generator 110 has divided the whole image 300 into a plurality of strips 310 a-310 n (shown in fig. 3A) with the same height, and compresses and encodes each strip. However, since the height of the new local update area is less than the height of the slices 310 a-310 n, the tile partition generator 110 will further partition the slice in which the local update area is located, and recompress and encode the slice in which the local update area is located.
For example, in response to the local update area being located in the stripe 310a and having a height smaller than that of the stripe 310a, the tile division generator 110 further divides the stripe 310a into a plurality of sub-stripes 320 a-320 n having the same height (as shown in FIG. 3B, the stripe 310a is divided into 3 sub-stripes 320 a-320 c in this example), and determines whether the height of the divided sub-stripes 320 a-320 c is the same as and coincides with the height of the local update area. In this embodiment, assuming that the height of the local update region is exactly the same as the height of each of the sub-stripes 320 a-320 c and exactly coincides with the sub-stripe 320b, the tile partition generator 110 also determines whether the width of the local update region is the same as the width of the sub-stripe 320 b. For example, as shown in FIG. 3C, the local update region is located at 330b, but its width is still less than the width of the sub-stripe 320b, so the tile partition generator 110 partitions the sub-stripe 320b into 3 tiles 330 a-330C based on the location of the local update region. Finally, after the tile division generator 110 completes the division of the tiles, the encoder 120 compresses and re-encodes the image information corresponding to the non-updated region and the image information of the local updated region corresponding to the input image, and stores the encoded image data in the frame buffer 130. The image information corresponding to the non-updated area is read from the frame buffer 130 by the decoder 140.
It is noted that when the tile division generator 110 tiles the stripes or sub-stripes based on the width of the local update region, the size of the tile corresponding to the local update region may be different from the size of other tiles. In other words, when the tile division generator 110 performs vertical division, it is not necessary to divide the size of the tiles to be the same. In addition, after the tile division generator 110 completes the division of the tiles, the position information corresponding to each tile is stored in a tile information record table, so that the tile division generator 110 can determine whether the tiles need to be re-divided based on the position of the next input image.
FIGS. 4A and 4B are flow charts illustrating an image compression method according to another embodiment of the present invention. In step S401, the tile division generator 110 receives the input image and the position information corresponding to the input image. In step S402, the tile division generator 110 determines whether the input image is a complete image. In response to the input image being a complete image, the method proceeds to step S403, the tile division generator 110 sets the size of the tile to be the same as the size of the complete image, compresses and encodes the tile by the encoder 120 to obtain image data corresponding to the next frame (step S404), and stores the image data in the frame buffer 130 (step S405).
Otherwise, when the input image corresponds to a local update area, the process proceeds to step S406, and the tile division generator 110 further determines whether the local update area corresponding to the input image overlaps at least one of the tiles or a combination thereof according to the size and the position of the tile recorded in the tile information recording table. When the local updated region and at least one or a combination of the tiles overlap, the method proceeds to step S407, and the tile division generator 110 transmits the position corresponding to the local updated region to the decoder 140, so that the decoder 140 calculates the position of the un-updated region according to the position corresponding to the local updated region, so as to access the image data corresponding to the un-updated region from the frame buffer 130. In step S408, the encoder 120 compresses and encodes the image information corresponding to the input image to obtain the image data corresponding to the local update area. In step S409, the encoder 120 stores the image data corresponding to the local updated region and the image data corresponding to the non-updated region in the frame buffer 130.
However, in response to the local update region not coinciding with at least one of the tiles or a combination thereof, proceeding to step S410, the tile partitioning generator 110 repartitions the tiles based on the size of the local update region such that the tiles coincide with the local update region. In step S411, for the non-updated region, the tile dividing generator 110 further calculates the position of the non-updated region according to the position of the local updated region, so as to access the image data corresponding to the non-updated region from the frame buffer 130 through the decoder 140. In step S412, the encoder 120 recompresses and encodes the input image and the image information corresponding to the non-updated region to obtain the image data corresponding to the local updated region and the image data corresponding to the non-updated region. Finally, in step S413, the encoder 120 stores the image data corresponding to the local updated region and the image data corresponding to the non-updated region in the frame buffer 130 for the decoder 140 to decode for outputting to the display.
FIG. 5 is a block diagram of an image processing system according to another embodiment of the invention. As shown in fig. 5, the image processing system 500 includes at least an encoder 510, a frame buffer 520, and a decoder 530. The encoder 510 includes a multiplexer 511 and an encoding core 512. The multiplexer 511 is configured to receive the image information corresponding to the local update region and the position information corresponding to the local update region, and output the image information to the encoding core 512 according to the position of the local update region to compress and decode the image information. The frame buffer 520 is used to access image data corresponding to a frame. The decoder 530 comprises a primary decoding core 531 and a cooperative decoding core 532. The primary decoding core 531 accesses the image data corresponding to the next frame from the frame buffer 520, decodes the image data and outputs the decoded image information to a display (not shown). The cooperative decoding core 532 is used to decode the tiles related to the local update region and send the decoded image information back to the multiplexer 511. The multiplexer 511 may further include a buffer for temporarily storing the image information received from the cooperative decoding core 532.
According to an embodiment of the present invention, after the multiplexer 511 receives the input image (where the input image corresponds to a local update region) from the os, the cooperative decoding core 532 accesses and decodes the image data of the tile corresponding to the local update region from the frame buffer 520 according to the location information (output by the os) of the input image, and transmits the decoded image information back to the multiplexer 511. Then, the encoding core 512 recompresses and encodes the tile according to the location corresponding to the local update region and the image information corresponding to the tile returned by the cooperative decoding core 532, so as to refresh the image data originally stored in the frame buffer 520. For example, as shown in fig. 6, the area 622 is a local updated area, the area 621 is an un-updated area, and the area 620 is a tile corresponding to the local updated area. In response to the multiplexer 511 receiving the image information and the location information corresponding to the area 622, the cooperative decoding core 532 accesses the image data corresponding to the block 620 from the frame buffer 520 according to the location information received from the operating system and decodes the image data, so as to transmit the decoded image information (i.e., the pixels included in the block 620) corresponding to the block 620 back to the multiplexer 511. After receiving the image information corresponding to the block 620, the multiplexer 511 sequentially outputs the image information corresponding to the block 621 and the image information corresponding to the local update region to the encoding core 512 according to the position of the local update region, so that the pixels in the block are sequentially compressed and encoded again by the encoding core to generate the image data corresponding to the next frame.
It should be noted that, in this embodiment, although the size of the local update area is smaller than the size of the tile, the encoder 510 does not change the size of the tile, and the tile corresponding to the local update area is re-encoded.
Fig. 7 is a flowchart illustrating an image compression method according to another embodiment of the present invention. In step S701, the multiplexer 511 receives an input image corresponding to the local update area from the operating system. In step S702, the multiplexer 511 determines the tile corresponding to the input image, and enables the cooperative decoding core 532 to access the image data corresponding to the tile from the frame buffer 520 according to the tile corresponding to the input image, and decodes the image data for being transmitted back to the multiplexer 511 (step S703). In step S704, the multiplexer 511 sequentially outputs the pixels to the encoding core 512 according to the position information corresponding to the local updated region, so as to re-compress and encode the image information corresponding to the input image and the image information corresponding to the non-updated region in the tile. Finally, in step S705, the encoding core 512 stores the image data corresponding to the tile and the image data corresponding to the other non-updated regions in the frame buffer 520, so that the main decoding core 531 can access and decode the image data before displaying the next frame.
It is noted that although the above-described method has been described on the basis of a flowchart using a series of steps or blocks, the present invention is not limited to the order of the steps, and some steps may be performed in an order different from that of the rest of the steps or the rest of the steps may be performed simultaneously. Further, those skilled in the art will appreciate that the steps illustrated in the flow chart are not exclusive and may include other steps of the flow chart or one or more steps may be deleted without affecting the scope of the present invention.
In summary, according to the image processing system and the image compression method of the present invention, the present invention can flexibly support local update areas of various sizes, and at the same time, maximally preserve the correlation between primitive values, and ensure that the subjective vision is substantially lossless under the condition of reaching a compression rate of 1/2 or even 1/3. Meanwhile, when the local update area is not overlapped with the existing image block, the image block can be adaptively re-divided so as to achieve the best compression decoding image quality. In addition, the hardware module according to the present invention has a simple design, uses a small number of gates, has low power consumption, and is suitable for various types of panel driving chips.
The above description is only for the preferred embodiment of the present invention, and it is not intended to limit the scope of the present invention, and any person skilled in the art can make further modifications and variations without departing from the spirit and scope of the present invention, therefore, the scope of the present invention should be determined by the claims of the present application.
Claims (10)
1. An image compression method, comprising:
receiving an input image through a tile division generator;
judging whether the input image corresponds to a local updating area and is superposed with a block of the current frame or a combination of a plurality of blocks through the block division generator, and generating a judgment result; and
determining whether to re-partition the image blocks and re-compress and encode a part of the current frame by the image block division generator according to the judgment result,
wherein, in response to the input image corresponding to the local update area but the local update area not overlapping with the tile or the combination of the plurality of tiles of the current frame, the tile division generator re-divides the tile according to the size of the local update area so that the tile overlaps with the local update area.
2. The image compression method according to claim 1, further comprising:
compressing and encoding, by an encoder, the input image corresponding to a local update region to generate image data corresponding to the local update region in response to the input image corresponding to the local update region and the local update region overlapping the tile or the combination of tiles of the current frame;
storing the image data corresponding to the local update area into a frame buffer.
3. The image compression method according to claim 2, further comprising:
obtaining the position information corresponding to the non-updated region according to the position information corresponding to the local updated region through the tile division generator so as to output a local update signal to a decoder;
accessing, by the decoder, image information corresponding to the non-updated region from a frame buffer according to the local update signal;
storing the image information corresponding to the non-updated area into the frame buffer; and
outputting, by the decoder, a next frame based on the image data corresponding to the locally updated region and the image information corresponding to the non-updated region.
4. The image compression method according to claim 1, further comprising:
obtaining the position information corresponding to the non-updated region according to the position information corresponding to the local updated region through the tile division generator so as to output a local update signal to a decoder;
accessing, by the decoder, image information corresponding to the non-updated region from a frame buffer according to the local update signal;
compressing and encoding the input image corresponding to the local updated region and the image information corresponding to the non-updated region by an encoder to generate image data corresponding to a next frame; and
and storing the image data corresponding to the next frame into the frame buffer.
5. The image compression method according to claim 1, further comprising:
configuring, by the tile division generator, a size of the tile to be the same as a size of the full image when the input image corresponds to the full image;
compressing and encoding the complete image through an encoder to obtain image data corresponding to a next frame; and
storing the image data corresponding to the next frame into a frame buffer.
6. An image processing system, comprising:
a tile partitioning generator to:
receiving an input image;
judging whether the input image corresponds to a local updating area or not, and whether the input image is superposed with a block of the current frame or a combination of a plurality of blocks under the condition that the input image corresponds to the local updating area or not, and generating a judgment result; and
determining whether to subdivide the image blocks according to the judgment result;
an encoder for compressing and encoding a part of the input image and/or the current frame according to the determination result;
a frame buffer for storing the input image and the current frame; and
a decoder for decoding the current frame,
wherein, in response to the input image corresponding to the local update area but the local update area not overlapping with the tile or the combination of the plurality of tiles of the current frame, the tile division generator further re-divides the tiles according to the size of the local update area so that the tiles overlap with the local update area.
7. The image processing system of claim 6, wherein in response to the input image corresponding to a local update region and the local update region overlapping the tile or the combination of tiles of the current frame, the encoder further compresses and encodes the input image corresponding to the local update region to generate image data corresponding to the local update region, and stores the image data corresponding to the local update region in the frame buffer.
8. The image processing system of claim 7, wherein the tile division generator further obtains position information corresponding to an un-updated region according to the position information corresponding to the local updated region to output a local update signal to the decoder, the decoder further accesses image information corresponding to the un-updated region from a frame buffer according to the local update signal and stores the image information corresponding to the un-updated region into the frame buffer, and the decoder further outputs a next frame according to the image data corresponding to the local updated region and the image information corresponding to the un-updated region.
9. The image processing system of claim 6, wherein the tile division generator further obtains position information corresponding to an un-updated region according to the position information corresponding to the local updated region to output a local update signal to the decoder, the decoder further accesses image information corresponding to the un-updated region from the frame buffer according to the local update signal, and the encoder further compresses and encodes the input image corresponding to the local updated region and the image information corresponding to the un-updated region to generate image data corresponding to a next frame and stores the image data corresponding to the next frame into the frame buffer.
10. The image processing system of claim 6, wherein the tile division generator further configures the size of the tiles to be the same as the size of the full picture in response to the input picture corresponding to the full picture, and the encoder further compresses and encodes the full picture to obtain picture data corresponding to a next frame and stores the picture data corresponding to the next frame in a frame buffer.
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