CN109712206B - Data compression method, display device and computer readable storage medium - Google Patents
Data compression method, display device and computer readable storage medium Download PDFInfo
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Abstract
The invention discloses a data compression method, which comprises the following steps: converting data to be compressed from a first color format to a second color format; compressing the data to be compressed converted into the second color format according to a preset compression ratio; and (4) making difference on the data of each position of the data to be compressed, and determining the compressed data according to the difference making result. The invention also discloses a display device and a computer readable storage medium. The invention reduces the storage space occupied by the data, saves the storage space of the time schedule controller, reduces the cost of the time schedule controller and improves the control efficiency of the time schedule controller.
Description
Technical Field
The present invention relates to the field of liquid crystal display technologies, and in particular, to a data compression method, a display device, and a computer-readable storage medium.
Background
With the increasing level of technology, more and more devices with display devices are used in daily life and work, such as televisions and mobile phones. In the display technology field, timing control is an important link for ensuring the display effect, and the size of an SRAM (Static Random-Access Memory) has a great influence on the cost of a timing controller, in the design of the existing timing controller, an over driver (liquid crystal deflection) needs to store the whole data of the previous frame, and the current frame inquires a lookup table according to the data of the previous frame and the current frame to determine the final output data, so the over driver is the module which occupies the most SRAM, takes the current HD, FHD and UHD resolutions as an example, and takes 26mbit,50mbit and 200mbit as an example under the premise that the capacity of the SRAM occupied by the over driver does not consider compression, which occupies a great proportion of the whole chip design. Therefore, when the SRAM occupies a large proportion, the control of the timing controller is affected, and the cost of the timing controller is increased.
In summary, the conventional data storage method increases the cost of the timing controller, and affects the control of the timing controller.
Disclosure of Invention
The invention mainly aims to provide a data compression method, a display device and a computer readable storage medium, aiming at solving the problems that the cost of a time schedule controller is increased and the control of the time schedule controller is influenced by the conventional data storage mode.
To achieve the above object, an aspect of the present invention provides a data compression method, including the steps of:
converting data to be compressed from a first color format to a second color format;
compressing the data to be compressed converted into the second color format according to a preset compression ratio;
and (4) performing difference on the data at each position of the data to be compressed, and determining the compressed data according to the difference result.
Optionally, the step of subtracting data at each position of the data to be compressed and obtaining compressed data according to the subtraction result includes:
determining data in a compression stage at present, and making a difference between data in other positions and the position in the compression stage at present;
and determining the compressed data according to the difference result.
Optionally, the step of determining compressed data according to the difference result includes:
and removing the data at the position matched with the preset rule, and determining the compressed data according to the data at the reserved position.
Optionally, the step of removing the data at the position matching the preset rule and determining the compressed data according to the data at the reserved position includes:
removing the data of the position with the maximum difference value and the position with the minimum difference value;
the data for determining the position where the difference value is the smallest among the current positions is retained as compressed data.
Optionally, the step of determining compressed data according to the difference result includes:
calculating the average value of the difference values;
the data of the position where the difference from the average value is minimum is retained as compressed data.
Optionally, the method further comprises:
acquiring the sensitivity of a user to the chromaticity and the sensitivity of the user to the brightness;
and determining a preset compression ratio according to the sensitivity of the chromaticity and the sensitivity of the brightness.
Optionally, the conversion formula for converting the data to be compressed from the first color format to the second color format is:
Y＝aR+bG+cB；
U＝d(B-Y)；
v = e (R-Y); where a, B, c, d, and e are constants, Y is luminance signal data, U and V are chrominance signal data, R is red data, G is green data, and B is blue data.
Optionally, the conversion formula for converting the data to be compressed from the first color format to the second color format is:
Y＝0.30R+0.59G+0.11B；
U＝0.493(B-Y)；
V＝0.877(R-Y)。
further, to achieve the above object, another aspect of the present invention provides a display device including: a memory, a processor and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method as described above.
In addition, to achieve the above object, a further aspect of the present invention provides a computer readable storage medium having a data compression program stored thereon, where the data compression program, when executed by a processor, implements the data compression method as described above.
The invention converts the pixel data from the first color format to the second color format, compresses the pixel data again on the basis, compares the difference of the data at different positions, and finally obtains the compressed data according to the difference result.
Drawings
Fig. 1 is a schematic structural diagram of a display device of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a data compression method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating setting of a predetermined compression ratio according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a process of differencing data at each position of data to be compressed and obtaining compressed data according to the differencing result in one embodiment of the present invention;
FIG. 5 is a flow chart illustrating the determination of compressed data based on the difference result according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a position relationship of data to be compressed according to an embodiment of the present invention;
FIG. 7 is a flow chart illustrating the determination of compressed data according to the difference result according to another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The main solution of the embodiment of the invention is as follows: converting data to be compressed from a first color format to a second color format; compressing the data to be compressed converted into the second color format according to a preset compression ratio; and (4) performing difference on the data at each position of the data to be compressed, and determining the compressed data according to the difference result.
The current data storage mode causes the cost increase of the time schedule controller and the control of the time schedule controller is affected. The invention provides a solution, which converts pixel data from a first color format to a second color format, recompresses the pixel data on the basis, compares the difference of the data at different positions, and finally obtains compressed data according to the difference result.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a display device of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the display device may include: a processor 1001, such as a CPU (central processing unit), a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., a WI-FI interface). The memory 1005 may be an SRAM memory or a non-volatile memory (non-volatile memory), such as a magnetic disk memory. The memory 1005 may alternatively be a storage device separate from the processor 1001 described previously.
Optionally, the display device may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 does not constitute a limitation of the display device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer-readable storage medium, may include therein an operating system, a network communication module, a user interface module, and a data compression application program.
In the display device shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations:
converting data to be compressed from a first color format to a second color format;
compressing the data to be compressed converted into the second color format according to a preset compression ratio;
and (4) making difference on the data of each position of the data to be compressed, and determining the compressed data according to the difference making result.
Further, the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations:
determining data currently in a compression stage, and making difference between data at other positions and the position currently in the compression stage;
and determining the compressed data according to the difference result.
Further, the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations:
and removing the data at the position matched with the preset rule, and determining the compressed data according to the data at the reserved position.
Further, the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations:
removing data of the position with the maximum difference value and the position with the minimum difference value;
the data that determines the position where the difference is smallest among the current positions is retained as compressed data.
Further, the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations:
calculating an average value of the difference values;
the data of the position having the smallest difference from the average value is retained as compressed data.
Further, the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations:
acquiring the sensitivity of a user to chromaticity and the sensitivity of brightness;
and determining the preset compression ratio according to the sensitivity of the chroma and the sensitivity of the brightness.
Further, the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations: the conversion formula for converting the data to be compressed from the first color format to the second color format is as follows:
Y＝aR+bG+cB；
U＝d(B-Y)；
v = e (R-Y); where a, B, c, d, and e are constants, Y is luminance signal data, U and V are chrominance signal data, R is red data, G is green data, and B is blue data.
Further, the processor 1001 may be configured to invoke a data compression application stored in the memory 1005 and perform the following operations: the conversion formula for converting the data to be compressed from the first color format to the second color format is as follows:
Y＝0.30R+0.59G+0.11B；
U＝0.493(B-Y)；
V＝0.877(R-Y)。
referring to fig. 2, an embodiment of the present invention provides a data compression method, where the data compression method includes:
step S10, converting the data to be compressed from a first color format to a second color format;
in this embodiment, each pixel of the pixel data output by the display card of the display device is composed of three values, i.e., R, G, and B, which respectively represent three colors, i.e., red, green, and blue. The first color format is a RGB three primary color format, and the second color format is a YUV format. YUV data is obtained by RGB data conversion format, the component Y representing a luminance signal, the components U, V representing two color difference signals.
The data to be compressed is pixel data in image data output by the display device, namely R, G and B numerical values, and the data to be compressed is converted from an RGB format to a YUV format to make data format conversion. The YUV format includes, but is not limited to YUV444 format and YUV420 format, and the corresponding YUV format is selected according to the requirement, where the pixel data is required to be converted from R, G and B format to YUV format. By converting the R, G, B pixel data into YUV format data, the luminance and chrominance in the display data are separated. The difference between the YUV420 format and the YUV444 format is: YUV420 retains all Y components in YUV444 data unchanged, and retains only U, V data in even rows and even columns.
In one embodiment, the conversion formula for converting the data to be compressed from the first color format to the second color format is:
Y＝aR+bG+cB；
U＝d(B-Y)；
v = e (R-Y); wherein a, b, c, d and e are constants. a. And the values of b, c, d and e are set according to requirements or actual experimental results. Specifically, the set values may be:
Y＝0.30R+0.59G+0.11B；
U＝0.493(B-Y)；
V＝0.877(R-Y)。
s20, compressing the data to be compressed converted into the second color format according to a preset compression ratio;
and after the pixel data is converted into the YUV format, compressing the pixel data converted into YUV according to a preset proportion to obtain compressed data to be compressed in the YUV format.
Wherein, the preset compression ratio can be that Y data is compressed by 50 percent, and UV data is compressed by 75 percent; the Y data compression may be 60%, the UV data compression may be 80%, and the like, which are set according to the actual situation.
In order to improve the automation of the setting of the compression ratio and improve the rationalization of the setting of the compression ratio, referring to fig. 3, the process of setting the preset compression ratio includes:
s11, acquiring the sensitivity of a user to the chromaticity and the brightness;
and S12, determining a preset compression ratio according to the sensitivity of the chromaticity and the sensitivity of the brightness.
The characteristics of human eyes indicate that the sensitivity of the human eyes to brightness is far higher than the sensitivity of chromaticity, and the sensitivity of the characteristics of the human eyes can be used as a reference to determine the compression ratio of the human eyes in data compression, namely, the sensitivity of the current user to the chromaticity and the sensitivity of the brightness are determined firstly, a preset compression ratio is determined according to the sensitivity of the chromaticity and the sensitivity of the brightness, and a mapping relation between the sensitivity of the chromaticity and the sensitivity of the brightness and the preset compression ratio is established in advance, for example, the sensitivity of the chromaticity s1 and the sensitivity of the brightness l1 correspond to the compression ratio y1; and the sensitivity of chrominance s2 and the sensitivity of luminance l2 correspond to a compression ratio of y2. The preset compression ratio is determined by the sensitivity of the chrominance and the luminance, so that the compression ratio is more suitable.
More specifically, the preset compression ratio may be: for example: luminance can compress 8 bits originally to 4 bits and UV can compress 8 bits to 2 bits, so RGB (888) is compressed to YUV (422).
In another embodiment of the present invention, the compression ratio may also be obtained based on the sensitivity of the luminance alone, that is, only the compression ratio corresponding to the sensitivity of the luminance is set, and the compression ratio is set without taking the sensitivity of the chrominance. Or the compression ratio can be set independently of the sensitivity of the degree of decolorization. It will be appreciated that the manner in which the selection is made to determine the preset compression ratio may be determined by user settings, or by default, or by setting for different types of users, detecting user information, determining the user type, and setting the selection of different determination manners according to the user type, e.g., the selection of the color weakness is determined by the sensitivity of the brightness; or the sensitivity of the chroma can be selected for the sensitivity difference of the brightness to determine the preset compression ratio. For the elderly users, because the sensitivity to brightness and chromaticity is poor, a mode can be randomly selected for determination.
And step S30, differencing the data at each position of the data to be compressed, and determining the compressed data according to the differencing result.
In the data compression process, different data can be compressed at different moments, data at a plurality of positions can be compressed successively, data at each position of the data to be compressed are subjected to difference, and the compressed data are determined according to the difference result.
The mode of determining the compressed data according to the difference result is to find a compression mode close to the original data, and the mode has the least distortion and the maximum compression degree for data compression, thereby compressing the data to the maximum extent and reducing the occupied storage space. For example, the determination of the compressed data based on the difference result may be that one of the data whose difference value is at the middle value is taken as the compressed data, or that data at a position close to the average value of the data is taken as the compressed data, or the like.
Referring to fig. 4, the step of subtracting data at each position of the data to be compressed and obtaining compressed data according to the subtraction result includes:
s21, determining data in the compression stage at present, and making difference between the data in other positions and the position in the compression stage at present;
and S22, determining the compressed data according to the difference result.
The data compression is performed in stages, not necessarily all at the same time. In the process of compressing data, determining data currently in a compression stage, subtracting data at other positions from the position currently in the compression stage, determining compressed data according to a subtraction result, and determining compressed data according to the subtraction result, namely determining which data is used as the compressed data according to the difference value of the subtraction result, for example, the data with the minimum difference value with the current compressed data is used as the compressed data or the compressed data with the difference value closest to the average value is used as the compressed data. In an embodiment of the present invention, in addition to the difference from the current position, the following may be performed: a reference position is set, the difference between other positions and the reference position is set according to experience, and the compressed data is determined according to the difference result instead of singly adopting the difference between the current position and other positions. The difference mode can also be: and averaging the compressed data at all positions, taking the position with the minimum difference value with the average value as a comparison position, making a difference between the data at other positions and the current position, and determining the compressed data according to the difference result.
In another embodiment of the present invention, referring to fig. 5, the step of determining the compressed data according to the difference result includes:
and step S221, removing the data at the position matched with the preset rule, and determining the compressed data according to the data at the reserved position. The preset rule is that the difference value meets a preset difference value, for example, the difference value is the smallest and/or the difference value is the largest data, and the position with the largest or smallest difference value is the data meeting the preset rule, that is, the data meeting the preset rule and matching with the preset rule needs to be removed, and the data at the reserved position is determined as the compressed data. Specifically, the step of removing the data at the position matched with the preset rule and determining the compressed data according to the data at the reserved position includes:
removing the data of the position with the maximum difference value and the position with the minimum difference value; the data for determining the position where the difference value is the smallest among the current positions is retained as compressed data. Referring to fig. 6, relationship of data positions referring to fig. 6, data compression includes: the circle is the current compressed data, the difference is made between the current position and the positions 1,2,3 and 4, the position with the minimum difference is removed, the position with the maximum difference is removed, and then the position with the smaller difference is taken from the rest two positions.
In an embodiment of the present invention, referring to fig. 7, the step of determining the compressed data according to the difference result includes:
step S23, calculating the average value of the difference values;
in step S24, the data of the position having the smallest difference from the average value is retained as compressed data.
After the difference is made between the compressed data at different positions and the current position, an average value of the difference is calculated, or an average value of one compressed data is calculated, the data with the minimum difference from the data at the current position in the data is calculated according to the average value, the data is used as the compressed data, namely, the data which is most reliably compressed and is smaller is used as the compressed data, so that the space occupied by the compressed data is reduced, and the data is further compressed in a processing mode after the difference is made with the different data provided in fig. 4, so that the data is compressed. In an embodiment of the present invention, the average value of the data may be found without performing the difference, the data closest to the average value is found from the data at all the positions, and the found data is used as the compressed data, which is compressed without distortion and has a proper compression ratio, thereby saving the storage space. On the basis of the direct compression, the data is further compressed in a difference mode, so that the storage space occupied by the data is reduced, and the data compression is more reasonable and the space utilization is more reasonable.
According to the embodiment, the pixel data is converted from the first color format to the second color format, and then is compressed again on the basis, the data at different positions are subjected to difference comparison, finally, the compressed data is obtained according to the difference result, and the data to be stored is compressed to the maximum extent in the data compression process in a multi-stage compression mode, so that the storage space occupied by the data is reduced, the storage space of the time schedule controller is saved, the cost of the time schedule controller is reduced, and the control efficiency of the time schedule controller is improved.
In addition, the embodiment of the invention also provides a display device, which comprises a display panel and a time schedule controller connected with the display panel, wherein a data compression control device is loaded in the time schedule controller, the display panel completes display operation under the control of the time schedule controller, the compression mode of data stored in the time schedule controller is completed by the data compression method in the embodiment, and the data compression method is loaded and a data compression device for the time schedule controller to call and start to complete data compression, so that the data compression and the time schedule control efficiency are better completed. The display device can be a mobile or fixed display device such as a television, a mobile phone, a pad, a machine display instrument and the like. The display device of the embodiment converts the pixel data from the first color format to the second color format, recompresses the pixel data on the basis, compares the difference of the data at different positions, and finally obtains the compressed data according to the difference result.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, and a computer-readable storage medium, where a data compression program is stored on the computer-readable storage medium, and when the data compression program is executed by a processor, the data compression method according to the above embodiment is implemented.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a computer readable storage medium (such as ROM/RAM, magnetic disk, optical disk) as described above and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A data compression method, characterized in that it comprises the steps of:
converting data to be compressed from a first color format to a second color format;
compressing the data to be compressed converted into the second color format according to a preset compression ratio;
data of each position of the data to be compressed are subjected to difference, and the compressed data are determined according to the difference result;
the step of subtracting the data at each position of the data to be compressed and obtaining the compressed data according to the subtraction result comprises:
determining data currently in a compression stage, and making difference between data at other positions and the position currently in the compression stage;
determining compressed data according to the difference result;
wherein the step of determining compressed data based on the difference result comprises:
removing the data at the position matched with the preset rule, and determining compressed data according to the data at the reserved position;
or the like, or, alternatively,
calculating an average value of the difference values;
the data of the position where the difference from the average value is minimum is retained as compressed data.
2. The data compression method as claimed in claim 1, wherein the step of removing the data of the position matching the preset rule and determining the compressed data based on the data of the reserved position comprises:
removing the data of the position with the maximum difference value and the position with the minimum difference value;
the data that determines the position where the difference is smallest among the current positions is retained as compressed data.
3. The method of data compression of claim 1, the method further comprising:
acquiring the sensitivity of a user to chromaticity and the sensitivity of brightness;
and determining the preset compression ratio according to the sensitivity of the chroma and the sensitivity of the brightness.
4. A data compression method as claimed in any one of claims 1 to 3, wherein the conversion formula for converting the data to be compressed from the first color format to the second color format is:
Y＝aR+bG+cB；
U＝d(B-Y)；
v = e (R-Y); where a, B, c, d, and e are constants, Y is luminance signal data, U and V are chrominance signal data, R is red data, G is green data, and B is blue data.
5. The data compression method as claimed in claim 4, wherein the conversion formula for converting the data to be compressed from the first color format to the second color format is:
Y＝0.30R+0.59G+0.11B；
U＝0.493(B-Y)；
V＝0.877(R-Y)。
6. a display device, characterized in that the display device comprises: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 1 to 5.
7. A computer-readable storage medium, characterized in that a data compression program is stored thereon, which when executed by a processor implements the data compression method according to any one of claims 1 to 5.
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| US5463702A (en) * | 1992-05-12 | 1995-10-31 | Sony Electronics Inc. | Perceptual based color-compression for raster image quantization |
| US6535634B1 (en) * | 1999-08-13 | 2003-03-18 | Globalstreams, Inc. | Video image compression/decompression apparatus and method |
| CN1526236A (en) * | 2001-07-12 | 2004-09-01 | �ű�ʵ������֤��˾ | Method and system for improving compressed image chroma information |
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