CN102523444A - Compression method for monochrome bitmap and system thereof - Google Patents
Compression method for monochrome bitmap and system thereof Download PDFInfo
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Abstract
The invention relates to the related technical field of compression methods, in particular to a compression method for a monochrome bitmap and a system thereof. The monochrome bitmap is expressed by adopting binary data. The method comprises the following steps of: scanning data of one monochrome bitmap; and when encountering continuation 1 exceeding a preset first threshold value or continuation 0 exceeding the preset first threshold value, carrying out a compression step for generating compressed data, or else carrying out an uncompression step for generating uncompressed data. The compression algorithm provided by the invention has obvious effect for reducing time consumption generated by overall display data transmission of a mainboard central processing singlechip, so that the refreshing frequency of an interface of a navigator can be improved, and more fluent feeling is brought for clients.
Description
Technical field
The present invention relates to the compression method correlative technology field, particularly a kind of monochrome bitmap compression method and system thereof.
Background technology
Car multimedia entertainment system mainly is made up of main frame (CD player), separate type display screen, separate type keypad, steering wheel controller.Wherein main frame transmits video data through the CGI communication mode and gives the separate type display screen.
Existing multi-functional navigation host can directly be replaced the separate type display screen, can realize all Presentation Functions of former car separate type display screen.
But the video data in the actual transmission of the CD player of automobile is the BMP monochrome bitmap data of 256*76 pixel; Each two field picture is 2432 byte; Common gateway interface (CGI, the CAN Graphic Interface) communication mode that passes through 625Kbps with the cycle of 70ms sends to display screen.For multi-functional navigation host, because function is complicated, the data processing pressure of this degree is very big, must carry out interface display by being transmitted to display module again after central processing module reception and the processing CGI data.In order to guarantee the smooth degree at interface, must guarantee the suitable refresh cycle, and the data forwarding amount of every frame 2432byte, a difficult point beyond doubt.
Have now in computer realm, solve the transmission problem of big data quantity, generally adopted compression algorithm.Like Chinese patent " the image compression " (patent No.: 00800959.7); The method that is used to compress one group of rest image is disclosed; Comprise step: be the basis, form two clusters to image according at least one image similarity tolerance with image color similar content property; At least one representational image of sign in each cluster; Whole other images in each cluster are identified as non-representational image, use and for example to diminish encode independently this representational image of each cluster of (for example JPEG) or lossless coding algorithm; And, use this representational image from this cluster as a benchmark image each non-representational image forecasting encoding to each cluster.
But existing image compression algorithm is all comparatively complicated, and in embedded system, because the qualification of single-chip microcomputer performance; Most of complicated compression algorithm all is not suitable for operation; And simple algorithm does not generally reach good compression ratio yet, and the improvement degree that transmits for data is very little.Embedded system data compression difficult or compression effectiveness are not good, cause the interface to be refreshed slowly, and the central processing module resource consumption is serious, even influences the complete machine performance.
Summary of the invention
The present invention provides a kind of monochrome bitmap compression method and system thereof, to solve the technical problem that prior art exists.
A kind of monochrome bitmap compression method, said monochrome bitmap adopt binary data to represent that each pixel of said bitmap only representes that by a bit said method comprises:
Data to a monochrome bitmap scan, when run into above preset first threshold value continuous 1 or surpass the continuous 0 time of preset first threshold value, carry out the compression step that generates packed data, otherwise carry out the non-compression step that generates unpacked data.
As a kind of preferred version, it is characterized in that (promptly a large amount of appearance continuously 1 or 0) are carried out processed compressed to redundant informations a large amount of in the view data, said compression step comprises:
Generating and indicating the data that generated is the compression designated symbol of packed data;
Generate and indicate the packed data that is generated to be used to represent continuous 1 or continuous 001 designated symbols;
Generate packed data that indication generated and comprise continuous 1 or the number designated symbol of continuous 0 number;
Compression designated symbol, 01 designated symbols and the combination of number designated symbol, generate packed data.
As further preferred version, carry out the data reservation process to the interval of partial information more complicated in the view data (being to occur between pixel changing repeatedly), said compression step further comprises:
Number when continuous 1 or continuous 0 is carried out following steps during greater than preset second threshold value:
(1) generating the data that indication generated is the compression designated symbol of packed data;
(2) generation indicates the packed data that is generated to be used to represent continuous 1 or continuous 001 designated symbols;
(3) if continuous 1 or continuous 0 number greater than second threshold value, then generate packed data that indication generated and comprise continuous 1 or the number designated symbol of continuous 0 number, the value of said number designated symbol is second threshold value, execution in step (5);
(4) if continuous 1 or continuous 0 number be less than or equal to second threshold value; Then generate packed data that indication generated and comprise continuous 1 or the number designated symbol of continuous 0 number; The value of said number designated symbol is continuous 1 or continuous 0 number, execution in step (5);
(5) compression designated symbol, 01 designated symbols and the combination of number designated symbol; Generate packed data; If continuous 1 or continuous 0 number greater than second threshold value, then calculate continuous 1 or continuous 0 number deduct the surplus value after second threshold value, with continuous 1 or continuous 0 number of this surplus value as next packed data; Execution in step (1), otherwise withdraw from.
As further preferred version, the unit that uses byte to describe as packed data, said packed data is 8 bit binary data; Comprise the 0th to the 7th; Wherein the 7th is the compression designated symbol, and the 6th is 01 designated symbols, and the 5th～the 0th is the number designated symbol.
As a kind of preferred version, use byte to describe the consecutive identical data of 7 to 63 bits, said first threshold is 7
Further,, consecutive identical data adopt packed compressed method when surpassing 63 bits, and said second threshold value is 63.
As a kind of preferred version, when when section position that scans the image information more complicated, adopt non-compression step, said non-compression step comprises:
Generating and indicating the data that generated is the non-compression designated symbol of unpacked data;
The one or more binary characters that are less than or equal to first threshold as non-compressed value symbol;
Produce unpacked data to non-compression designated symbol and non-compressed value symbol combination.
As further preferred version, the unit that uses byte to describe as unpacked data, said unpacked data is 8 bit binary data, comprises the 0th to the 7th, and wherein the 7th is non-compression designated symbol, and the 6th～the 0th is non-compressed value symbol.
A kind of embedded system; Said embedded system comprises obtains monochrome bitmap data and the central processing module of compression monochrome bitmap data and the display module that is connected with central processing module; Said central processing module adopts each described compression method of claim 1～8 that the monochrome bitmap data of being obtained are handled; And be transferred to display module to treated packed data and unpacked data according to the display sequence of image and handle, and be responsible for decompress(ion) and demonstration by display module.Said central processing module adopts 16 chip microcontroller, and display module adopts 32 single-chip microcomputers and 24 RGB screens to realize.
The compression algorithm that the present invention passes through has effect clearly to reducing mainboard central authorities processing single chip because of the time loss that whole video data forwarding is produced, thereby can improve the frequency that the guiding aircraft interface is refreshed, to the more smooth impression of client's arrival.
Description of drawings
Fig. 1 is an algorithm example one;
Fig. 2 is an algorithm example two;
Fig. 3 is an algorithm example three;
Fig. 4 is a schematic flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed explanation.
Existing BI_RLE8 compression algorithm
In WINDOWS3.0,3.1 bitmap file, adopted this compression method.This compression method coding is a base unit with 2 byte.Wherein byte1 has stipulated the color number of repetition with the byte2 appointment.As the 0x0504 that encodes representes to begin to show continuously 5 pixels that color value is 0x04 from current location.
The algorithm that BI_RLE8 derives
The BI_RLE8 compression algorithm is applicable to the compression of 256 color bitmaps, when its algorithm thought is applied to monochrome bitmap, can draw the arthmetic statement that BI_RLE8 derives:
Through scan-data by turn, go description to the data that repeat with a word (2byte), bit15 shows compression is continuous 1 or continuous 0, bit0 ~ bit15 describes continuous 1 or 0 number.
Example: before the compression: 0xFFFF 000000 FFFF 000000
The compression back: 0x8,010 0,018 8,010 0018
But when running into data and change repeatedly, compression effectiveness is not obvious.The worst situation is the data that 2 bytes remove to describe 1bit.
The video data of the actual transmission of the CD player of automobile is monochromatic BMP data bitmap, and according to transmitting data characteristic (monochromatic BMP data bitmap), the travel compression algorithm of design improved compresses data bitmap, and arthmetic statement is following:
The byte compress mode:
Whole thinking is for resolving again the BMP data bitmap through describing continuous 1 with continuous 0 number.Adopt byte for describing unit, form is:
Bit7: show whether data compression, 1 is compression, and 0 for compressing;
Bit6 ~ Bit0: if bit7 is 1, bit6 shows compression be continuous 1 or continuous 0,1 for describe be 1,0 for describe 0, totally 6 bits of bit5 ~ bit0 describes continuous 1 or 0 number. If bit7 is 0, bit6 and bit5 ~ bit0 totally 7 bits describe the data that need not compress.
The multibyte compress mode:
If a description unit is not enough to describe a large amount of situation of position continuously (continuous greater than 64), with the remaining continuous position of new description unit description.
For example have 85 continuous 1, then adopt the packed data of two bytes to represent, be respectively:
0b1111111 representes continuous 63 1;
0b1010110 representes continuous 22 1.
In the data after compression, the data of compression and the data that need not to compress possibly arranged simultaneously.
For example:
Data of description=0b11001111 representes that this byte is a packed data, and real data is to occur 15 1 continuously;
Data of description=0b00101011 representes that this byte is packed data not, and real data is 0b0101011;
The simple and easy flow process of compression algorithm:
It is as shown in Figure 4,
Step S101, the scanning initial data, adding up continuous 0 or 1 number (SUM) occurs;
Step S102, when SUM is less than or equal to first threshold 7, with not compress mode description, execution in step S101, otherwise, execution in step S103;
Step S103 when SUM greater than 7 and when being less than or equal to second threshold value 63, describe with compress mode, and 1 byte can be described execution in step S101, otherwise execution in step S104;
Step S103, when SUM greater than 63 the time, describe with compress mode, and need more than 1 byte to describe, use a plurality of description bytes, up to describing all continuous positions.After describing, return step 1, circulation.
Travel compression algorithm through with improvement voluntarily compresses data bitmap, has guaranteed higher compression ratio, and algorithm itself is fit to the single-chip microcomputer operation.The size of all interface datas all is 2432byte (monochrome bitmap of resolution 256*76), and 16 single-chip microcomputers of utilization and operation frequency 40M compress.Use the channel of 280Kbps to carry out the transmission of packed data between central processing module and display module, the utilization and operation frequency is that 32 single-chip microcomputers of 500M carry out the decompress(ion) restoring data.The algorithm effect example is following:
Like Fig. 1: after the compression, big or small 1257byte, 13.5ms consuming time;
Like Fig. 2: after the compression, big or small 896byte, 10ms consuming time;
Like Fig. 3, after the compression, big or small 396byte, 3.5ms consuming time;
Compression effectiveness contrast before and after the algorithm improvement, as shown in table 1.
Table 1: compression algorithm effect comparison
In the scheme of the CGI data forwarding of the travel compression algorithm after not using improvement, use the 280Kbps communication channel between central processing module and display module to carry out the CGI forwarding of data, need to consume the time of 68ms.
The CGI data forwarding scheme of the travel compression algorithm after having used improvement, time loss are respectively like distribution situation such as following table under the interface data situation of figure 1 ﹑ 2 ﹑ 3:
Table 2: the statistics of time loss under the different interface conditions
Can find out that image is simple more, compression ratio is just high more, and compression time is just few more, and the transmission time correspondingly also can reduce on year-on-year basis simultaneously.The algorithm of decompress(ion) is simple relatively, and the display module processing speed is fast, and time loss is far smaller than 1ms.And the display interface analysis through a large amount of original-pack CD players, compression ratio all can guarantee more than 50%, with the CGI data forwarding scheme contrast of not adopting the travel compression after the improvement, transmits the time average that consumes and saves 36.1ms, saved for 53.1% time.Because of the time loss that whole video data forwarding is produced effect is clearly arranged for reducing mainboard central authorities processing single chip, thereby can improve the frequency that the guiding aircraft interface is refreshed, to the more smooth impression of client's arrival.
Claims (10)
1. monochrome bitmap compression method, said monochrome bitmap adopt binary data to represent, it is characterized in that each pixel of said bitmap only representes that by a bit said method comprises:
Data to a monochrome bitmap scan, when run into above preset first threshold value continuous 1 or surpass the continuous 0 time of preset first threshold value, carry out the compression step that generates packed data, otherwise carry out the non-compression step that generates unpacked data.
2. compression method according to claim 1, said compression step comprises:
Generating and indicating the data that generated is the compression designated symbol of packed data;
Generate and indicate the packed data that is generated to be used to represent continuous 1 or continuous 001 designated symbols;
Generate packed data that indication generated and comprise continuous 1 or the number designated symbol of continuous 0 number;
Compression designated symbol, 01 designated symbols and the combination of number designated symbol, generate packed data.
3. compression method according to claim 2 is characterized in that, said compression step further comprises:
Number when continuous 1 or continuous 0 is carried out following steps during greater than preset second threshold value:
(1) generating the data that indication generated is the compression designated symbol of packed data;
(2) generation indicates the packed data that is generated to be used to represent continuous 1 or continuous 001 designated symbols;
(3) if continuous 1 or continuous 0 number greater than second threshold value, then generate packed data that indication generated and comprise continuous 1 or the number designated symbol of continuous 0 number, the value of said number designated symbol is second threshold value, execution in step (5);
(4) if continuous 1 or continuous 0 number be less than or equal to second threshold value; Then generate packed data that indication generated and comprise continuous 1 or the number designated symbol of continuous 0 number; The value of said number designated symbol is continuous 1 or continuous 0 number, execution in step (5);
(5) compression designated symbol, 01 designated symbols and the combination of number designated symbol; Generate packed data; If continuous 1 or continuous 0 number greater than second threshold value, then calculate continuous 1 or continuous 0 number deduct the surplus value after second threshold value, with continuous 1 or continuous 0 number of this surplus value as next packed data; Execution in step (1), otherwise withdraw from.
4. compression method according to claim 2; It is characterized in that using the unit of byte as the packed data description; Said packed data is 8 bit binary data, comprises the 0th to the 7th, and wherein the 7th is the compression designated symbol; The 6th is 01 designated symbols, and the 5th～the 0th is the number designated symbol.
5. compression method according to claim 1 is characterized in that, uses byte to describe the consecutive identical data of 7 to 63 bits, and said first threshold is 7.
6. compression method according to claim 3 is characterized in that, said second threshold value is 63.
7. compression method according to claim 1 is characterized in that, said non-compression step comprises:
Generating and indicating the data that generated is the non-compression designated symbol of unpacked data;
The one or more binary characters that are less than or equal to first threshold as non-compressed value symbol;
Produce unpacked data to non-compression designated symbol and non-compressed value symbol combination.
8. compression method according to claim 7 is characterized in that, the unit that uses byte to describe as unpacked data; Said unpacked data is 8 bit binary data; Comprise the 0th to the 7th, wherein the 7th is non-compression designated symbol, and the 6th～the 0th is non-compressed value symbol.
9. embedded system that adopts each described compression method of claim 1～8; It is characterized in that; Said embedded system comprises obtains monochrome bitmap data and the central processing module of compression monochrome bitmap data and the display module that is connected with central processing module; Said central processing module adopts each described compression method of claim 1～8 that the monochrome bitmap data of being obtained are handled; And be transferred to display module to treated packed data and unpacked data according to the display sequence of image and handle, and be responsible for decompress(ion) and demonstration by display module.
10. embedded system according to claim 9 is characterized in that, said central processing module adopts 16 chip microcontroller, and display module adopts 32 single-chip microcomputers and 24 RGB screens to realize.
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| CN102855643A (en) * | 2012-07-31 | 2013-01-02 | 北京天神互动科技有限公司 | Method for compressing and decompressing font library files and monochrome images |
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| CN109039342A (en) * | 2018-08-24 | 2018-12-18 | 国网河北省电力有限公司电力科学研究院 | A kind of compression method, system and the decompression method of force data, system out |
| CN109039342B (en) * | 2018-08-24 | 2022-12-06 | 国网河北省电力有限公司电力科学研究院 | Compression method and system and decompression method and system of output data |
| CN114301983A (en) * | 2021-11-18 | 2022-04-08 | 江西兴泰科技有限公司 | Method and system for compressing bytes of electronic ink screen picture, electronic equipment and storage medium |
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