CN104639854B - A kind of string processing display methods based on davinci platform - Google Patents
A kind of string processing display methods based on davinci platform Download PDFInfo
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Abstract
The invention discloses a kind of string processing display methods based on davinci platform, including：Obtain the character string to be shown of Chinese and English mixing；Search the internal code of character string to be shown and judgement is identified, obtain all English characters；The ASCII character of the English character of each byte of acquisition is converted to the Chinese internal code of corresponding two byte in default chinese character storehouse, the Chinese internal code of character string to be shown is finally obtained；The Chinese internal code of character string to be shown is converted into Hanzi section-position code；Default chinese character storehouse is searched, the corresponding character pattern data of each character is obtained；Character pattern data is expanded to the font size of user's setting, and then each judged, " 0 " position and " 1 " position are filled respectively and OSD buffer areas are sent to after different yuv datas show.The present invention can the Chinese and English mixed characters of Dynamic Announce, realize the display of multiple fonts size, greatly save system resource, can be widely applied to OSD display fields.
Description
Technical field
It is more particularly to a kind of to be based on Leonardo da Vinci the present invention relates to the OSD text addition Display Techniques of field of video processing
The string processing display methods of platform.
Background technology
In field of video monitoring, often using OSD（On Screen Display, on-chip study）Technology is by video scene
The information such as time, place be added to by way of word in video image, user is likely to require in actual application
Some self-defined text informations are added in monitor video.By foreign countries introduce davinci platform be a kind of digital picture, video,
The new platform of voice, Audio Signal Processing, davinci platform does not support the processing of Chinese character substantially, therefore, Chinese and English character mixing
OSD Overlapping displays be a major issue that video monitoring system based on davinci platform needs to solve.
During the embedded development of video monitoring system, system often only supports the display of standard ASCII character, does not prop up
Hold chinese disply, it is therefore desirable to the problem of solving chinese disply., can be by using for the occasion that seldom changes of display word
The problem of method for making Chinese character base by oneself solves chinese disply, i.e., the dot matrix number of a small amount of Chinese character needed for being extracted from Hanzi font library
According to the homemade small-sized character library of formation, such equipment can show fixed several Chinese characters.But this mode can not meet OSD
The dynamic need of text information, it is impossible to change the Chinese character of display at any time according to the actual requirements.Moreover, this mode, be realized aobvious
Show different size of Chinese character style and then must store different size of dot matrix word library the system resource, it is necessary to more, such as 16 ×
16 Chinese dot matrix word library is accomplished by the system resource more than 200K, and this is great waste to system resource.
The content of the invention
In order to solve above-mentioned technical problem, at a kind of character string based on davinci platform
Manage display methods.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of string processing display methods based on davinci platform, including：
S1, the character string to be shown for obtaining Chinese and English mixing；
Simultaneously judgement is identified in S2, the internal code for searching character string to be shown, obtains all English in character string to be shown
Chinese character；
S3, according to the first preset rules the ASCII character of the English character of each byte of acquisition is converted into default Chinese character
The Chinese internal code of corresponding two byte, finally obtains the Chinese internal code of character string to be shown in character repertoire；
S4, the Chinese character that the Chinese internal code of character string to be shown is converted to according to the second preset rules character string to be shown
Region-position code；
S5, the Hanzi section-position code according to character string to be shown, search default chinese character storehouse, are obtained according to the 3rd preset rules
Obtain the corresponding character pattern data of each character；
S6, the font size that character pattern data is expanded to user's setting, obtain character pattern data to be shown, and then to be shown
Each of character pattern data is judged, " 0 " position and " 1 " position is filled respectively OSD buffer areas are sent to after different yuv datas
Shown.
Further, the default chinese character storehouse uses 16 × 16 HZK16 character libraries.
Further, the step S2, it is specially：
Search each byte of the internal code of character string to be shown and judge whether the byte is less than 0x80, if so, then sentencing
The byte of breaking is English character, otherwise is chinese character, finally obtains all English characters in character string to be shown.
Further, first preset rules are：
Chinese internal code=0x03+0xa0 of the corresponding high byte of English character；
ASCII character-the 32+0xa0 of Chinese internal code=English character of the corresponding low byte of English character.
Further, second preset rules are：
High byte-the 0xa0 of the Chinese internal code of the Chinese character area code=character of character；
Low byte-the 0xa0 of the Chinese internal code of Chinese character bit code=character of character.
Further, the 3rd preset rules are：
The first address in the index position of character correspondence character pattern data=default chinese character storehouse+（94×（Chinese character area code -1）+
（Chinese character bit code -1））×32.
Further, the step of character pattern data being expanded into the font size of user's setting described in the step S6, it has
Body is：
Extension multiple m is obtained after the font size divided by the original size of character pattern data that set user according to following formula, is entered
And the every bit of character pattern data is extended to m2Individual point：
m= p/ n
In above formula, p represents the font size b [p] [p] of user's setting exponent number, and n represents the original size a of character pattern data
The exponent number of [n] [n], m is positive integer.
The beneficial effects of the invention are as follows：A kind of string processing display methods based on davinci platform of the present invention, bag
Include：S1, the character string to be shown for obtaining Chinese and English mixing；Simultaneously judgement is identified in S2, the internal code for searching character string to be shown,
Obtain all English characters in character string to be shown；S3, according to the first preset rules by the English words of each byte of acquisition
The ASCII character of symbol is converted to the Chinese internal code of corresponding two byte in default chinese character storehouse, finally obtains character to be shown
The Chinese internal code of string；S4, according to the second preset rules the Chinese internal code of character string to be shown is converted into character to be shown
The Hanzi section-position code of string；S5, the Hanzi section-position code according to character string to be shown, search default chinese character storehouse, pre- according to the 3rd
If rule obtains the corresponding character pattern data of each character；S6, the font size that character pattern data is expanded to user's setting, are treated
Character pattern data is shown, and then each to character pattern data to be shown judges, difference is filled respectively to " 0 " position and " 1 " position
Yuv data after be sent to OSD buffer areas and shown.This method can be with the Chinese and English mixed characters of Dynamic Announce, and only need
The default chinese character storehouse for a kind of size that prestores, it is possible to realize the display of multiple fonts size, effectively saves storage a variety of big
The memory headroom in small characters storehouse, in embedded system, system resource can be greatlyd save.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of schematic flow sheet of string processing display methods based on davinci platform of the present invention；
Fig. 2 is the pass between internal code, GB code and the region-position code of Chinese character " " shown in embodiments of the invention two
It is schematic diagram；
Fig. 3 is the dot matrix font schematic diagram of 16 × 16 character pattern data of Chinese character " one "；
Fig. 4 is 32 × 32 dot matrix font schematic diagram obtained after being extended to character pattern data in Fig. 3；
Fig. 5 is to fill the method schematic diagram of yuv data to the character pattern data to be shown of acquisition in embodiments of the invention two.
Embodiment
Reference picture 1, the invention provides a kind of string processing display methods based on davinci platform, including：
S1, the character string to be shown for obtaining Chinese and English mixing；
Simultaneously judgement is identified in S2, the internal code for searching character string to be shown, obtains all English in character string to be shown
Chinese character；
S3, according to the first preset rules the ASCII character of the English character of each byte of acquisition is converted into default Chinese character
The Chinese internal code of corresponding two byte, finally obtains the Chinese internal code of character string to be shown in character repertoire；
S4, the Chinese character that the Chinese internal code of character string to be shown is converted to according to the second preset rules character string to be shown
Region-position code；
S5, the Hanzi section-position code according to character string to be shown, search default chinese character storehouse, are obtained according to the 3rd preset rules
Obtain the corresponding character pattern data of each character；
S6, the font size that character pattern data is expanded to user's setting, obtain character pattern data to be shown, and then to be shown
Each of character pattern data is judged, " 0 " position and " 1 " position is filled respectively OSD buffer areas are sent to after different yuv datas
Shown.
It is further used as preferred embodiment, the default chinese character storehouse uses 16 × 16 HZK16 character libraries.
It is further used as preferred embodiment, the step S2, it is specially：
Search each byte of the internal code of character string to be shown and judge whether the byte is less than 0x80, if so, then sentencing
The byte of breaking is English character, otherwise is chinese character, finally obtains all English characters in character string to be shown.
It is further used as preferred embodiment, first preset rules are：
Chinese internal code=0x03+0xa0 of the corresponding high byte of English character；
ASCII character-the 32+0xa0 of Chinese internal code=English character of the corresponding low byte of English character.
It is further used as preferred embodiment, second preset rules are：
High byte-the 0xa0 of the Chinese internal code of the Chinese character area code=character of character；
Low byte-the 0xa0 of the Chinese internal code of Chinese character bit code=character of character.
It is further used as preferred embodiment, the 3rd preset rules are：
The first address in the index position of character correspondence character pattern data=default chinese character storehouse+（94×（Chinese character area code -1）+
（Chinese character bit code -1））×32.
It is further used as preferred embodiment, character pattern data is expanded to the word of user's setting described in the step S6
The step of body size, it is specially：
Extension multiple m is obtained after the font size divided by the original size of character pattern data that set user according to following formula, is entered
And the every bit of character pattern data is extended to m2Individual point：
m= p/ n
In above formula, p represents the font size b [p] [p] of user's setting exponent number, and n represents the original size a of character pattern data
The exponent number of [n] [n], m is positive integer.
With reference to specific embodiment, the present invention will be further described.
Embodiment one
Reference picture 1, a kind of string processing display methods based on davinci platform, including：
S1, the character string to be shown for obtaining Chinese and English mixing；
Simultaneously judgement is identified in S2, the internal code for searching character string to be shown, obtains all English in character string to be shown
Chinese character, it is specific as follows：
Search each byte of the internal code of character string to be shown and judge whether the byte is less than 0x80, if so, then sentencing
The byte of breaking is English character, otherwise is chinese character, finally obtains all English characters in character string to be shown.Because English
Chinese character is represented using ASCII character, and the coding range of ASCII character is 0 ~ 127, each byte of the internal code of chinese character
The first internal code all for each byte of 1, i.e. chinese character is both greater than equal to 128, is less than 128 when retrieving a certain byte
（That is 0x80）When, it may be determined that the byte is the ASCII character of English character.
S3, according to the first preset rules the ASCII character of the English character of each byte of acquisition is converted into default Chinese character
The Chinese internal code of corresponding two byte, finally obtains the Chinese internal code of character string to be shown in character repertoire；In the present embodiment,
Default chinese character storehouse uses 16 × 16 HZK16 character libraries.
First preset rules are：Chinese internal code=0x03+0xa0 of the corresponding high byte of English character；English character pair
ASCII character-the 32+0xa0 of the Chinese internal code=English character for the low byte answered.
English character is mapped in default chinese character storehouse after the Chinese internal code of corresponding two byte and mixed by this method
Display.
S4, the Chinese character that the Chinese internal code of character string to be shown is converted to according to the second preset rules character string to be shown
Region-position code；Region-position code includes area's code and bit code；
Second preset rules are：High byte-the 0xa0 of the Chinese internal code of the Chinese character area code=character of character；The Chinese of character
Low byte-the 0xa0 of the Chinese internal code of word bit code=character.
S5, the Hanzi section-position code according to character string to be shown, search default chinese character storehouse, are obtained according to the 3rd preset rules
Obtain the corresponding character pattern data of each character；
3rd preset rules are：The first address in the index position of character correspondence character pattern data=default chinese character storehouse+（94
×（Chinese character area code -1）+（Chinese character bit code -1））×32.
S6, the font size that character pattern data is expanded to user's setting, obtain character pattern data to be shown, and then to be shown
Each of character pattern data is judged, " 0 " position and " 1 " position is filled respectively OSD buffer areas are sent to after different yuv datas
Shown.This method need to only prestore a kind of default chinese character storehouse of size, it is possible to realize the display of multiple fonts size,
The memory headroom of a variety of size character repertoires of storage is effectively saved, in embedded system, system resource can be greatlyd save.
In this step, the step of character pattern data is expanded into the font size of user's setting, it is specially：
Extension multiple m is obtained after the font size divided by the original size of character pattern data that set user according to following formula, is entered
And the every bit of character pattern data is extended to m2Individual point：
m= p/ n
In above formula, p represents the font size b [p] [p] of user's setting exponent number, and n represents the original size a of character pattern data
The exponent number of [n] [n], m is positive integer.
Character pattern data represents that the font size of user's setting is also a lattice matrix, this reality using lattice matrix
Apply in example, the original size of character pattern data is matrix a [n] [n], and the font size that user sets then extends as matrix b [p] [p]
Multiple m=p/n, m is extended to by the every bit of the lattice matrix of character pattern data2Individual point, it is assumed that a [i] [j] is the point of character pattern data
Battle array matrix a bit, then by the matrix after extension by point b [m*i] [m*j], b [m*i] [m*j+ (m-1)], b [m*i+ (m-1)]
Point in the range of [m*j], b [m*i+ (m-1)] [m*j+ (m-1)] 4 points of square formations surrounded all assigns a values of [i] [j].
Embodiment two
Headend equipment of the present embodiment based on video monitoring system, this headend equipment is a kind of embedded processing platform-reach
Fragrant Qiping platform, the OSD schemes of this platform are only able to display the ASCII character and fixed several Chinese characters of standard, herein under the premise of, this implementation
Example, which is proposed, a kind of can show the string processing display methods based on davinci platform of all Chinese and English characters, reference picture
1, it is comprised the following steps that：
Step 1, HZK16 character libraries are put into processing platform during embedded development first, HZK16 character libraries are symbols
Close 16 × 16 dot matrix word libraries of GB2312 standards, the Chinese character that HZK16 GB2312-80 is supported there are 6763, symbol 682, its
Middle first-level Chinese characters has 3755, and the Chinese characters of level 2 have 3008.
Step 2, the Chinese and English mixed characters string of acquisition User Defined, i.e., character string to be shown, such as unsigned char
Osd []=" XTE welcomes you！”.
Step 3, analysis understand character string, and " XTE welcomes you！" in " XTE！" it can show character for ASCII character, " welcoming you " is
Chinese character, an ASCII character is a byte, a GB2312 Chinese character be by two byte codes, whole character string
Internal code is：0x58 0x54 0x45 0xbb 0xb6 0xd3 0xad 0xc4 0xfa 0x21.
Step 4, judgement is identified to above character string internal code：Judge each byte, search the byte less than 0x80
Have：0x58 0x54 0x45 0x21, therefore just find the position osd [0] of the English character in character string, osd [1], osd
[2], osd [9], other is Chinese character.
Step 5, table 1 as follows be ASCII character can show character coding between corresponding Hanzi section-position code
Mapping table, as can be seen from Table 1, all ASCII characters can show the Chinese character area code=0x03 of character, Chinese character bit code=ASCII
Code -32.Fig. 2 shows the relation between internal code, GB code and the region-position code of a Chinese character " ", summarizes and obtains English words
The first preset rules that the ASCII character of symbol is converted to the Chinese internal code of corresponding two byte in default chinese character storehouse are：English
Chinese internal code=0x03+0xa0 of the corresponding high byte of Chinese character；Chinese internal code=English of the corresponding low byte of English character
ASCII character-the 32+0xa0 of Chinese character.So, " XTE welcomes you！" 10 bytes internal code change after into 14 bytes Chinese character machine
ISN：0xa3 0xd8 0xa3 0xd4 0xa3 0xc5 0xbb 0xb6 0xd3 0xad 0xc4 0xfa 0xa3 0xa1.
The mapping table of the ASCII character of table 1 and Hanzi section-position code
Step 6, summarize Fig. 2 and can obtain in the relation between Chinese internal code and region-position code, Fig. 2, for Chinese character " ", its
Chinese character area code 00010000=internal code high byte 10110000-10100000 (0xa0), Chinese character bit code=internal code low byte-
0xa0.Therefore, the second preset rules for Chinese internal code being converted into Hanzi section-position code are as follows：The Chinese character area code=character of character
Chinese internal code high byte -0xa0；Low byte-the 0xa0 of the Chinese internal code of Chinese character bit code=character of character.According to
Chinese internal code that two preset rules are obtained to step 5, which carries out conversion, can obtain that " XTE welcomes you！" Hanzi section-position code.
Step 7, according to " XTE welcomes you！" Hanzi section-position code, calculate the index bit of the corresponding character pattern data of each character
Put, found in HZK16 character libraries and obtain the corresponding character pattern data of each character.Each Chinese character in HZK16 character libraries is needed
16 × 16=256 points are wanted to show, the character pattern data of a Chinese character is 256/8=32 byte, can according to index position
Obtain the corresponding character pattern data of character.3rd preset rules of computation index position are：The index bit of character correspondence character pattern data
Put=preset the first address in chinese character storehouse+（94×（Chinese character area code -1）+（Chinese character bit code -1））×32.
Step 8, step 7, which are searched, to be obtained after the corresponding character pattern data of each character, the font size pair set according to user
Character pattern data is extended, and obtains character pattern data to be shown.The font size that user sets in the present embodiment has 16 × 16,32 ×
32,48 × 48,64 × 64 4 kinds of schemes, the scheme being extended is as follows：
Assuming that the original size of character pattern data is matrix a [n] [n], the font size of user's setting is the font after extension
Size is b [p] [p], then extends multiple m=p/ n, the every bit of character pattern data is extended into m2It is individual, n in the present embodiment=
16.If the font size that user sets is 32 × 32, p=32, m=2, m2=4, by each of the original matrix of character pattern data
Point is extended to 4 points, and 256 points are extended into 256*22=1024 point.Shown in reference picture 3, Fig. 4, Fig. 3 is Chinese character " one "
The dot matrix font schematic diagram of 16 × 16 character pattern data, Fig. 4 is 32 × 32 obtained after being extended to character pattern data in Fig. 3
Dot matrix font schematic diagram, it is assumed that a [i] [j] for character pattern data lattice matrix a bit, then by the matrix after extension by point b
[m*i] [m*j], b [m*i] [m*j+ (m-1)], b [m*i+ (m-1)] [m*j], 4 points of b [m*i+ (m-1)] [m*j+ (m-1)]
Point in the range of the square formation surrounded all assigns a values of [i] [j].When the font size that user sets is other numerical value,
It is extended in the same way.
Step 9, each of character pattern data to be shown is judged, different is filled respectively to " 0 " position and " 1 " position
OSD buffer areas are sent to after yuv data to be shown.The processing platform of the practical application of the present embodiment uses YUV422 numbers
According to spread pattern of the YUV422 data in internal memory is：Y0U0Y1V0Y2U1Y3V1 ..., two pixels share one group of UV number
According to that is, one pixel is represented with 2 byte datas, and for this data of YUV422, we need to only fill to " 0 " and " 1 " data
UV data are assigned identical value by different Y data values, and Fig. 5 shows a kind of method example of simple processing yuv data
To reach purpose that character is shown, different yuv data " 0xff 0x7d " and " 0x00 of Y value is filled to " 0 " position and " 1 " position
0x7d”.YUV values can be filled by various methods in actual use.After filling is finished, yuv data feeding possessed into OSD
In the OSD buffer areas of function system, this yuv data can be superimposed in vision signal by system automatically, and such screen can just show
Shown with the Chinese character of intensity contrast.
Above is the preferable implementation to the present invention is illustrated, but the invention is not limited to the implementation
Example, those skilled in the art can also make a variety of equivalent variations or replace on the premise of without prejudice to spirit of the invention
Change, these equivalent modifications or replacement are all contained in the application claim limited range.
Claims (6)
1. a kind of string processing display methods based on davinci platform, it is characterised in that including step：
S1, the character string to be shown for obtaining Chinese and English mixing；
Simultaneously judgement is identified in S2, the internal code for searching character string to be shown, obtains all English words in character string to be shown
Symbol；
S3, according to the first preset rules the ASCII character of the English character of each byte of acquisition is converted into default chinese character
The Chinese internal code of corresponding two byte, finally obtains the Chinese internal code of character string to be shown in storehouse；
S4, the Chinese character position that the Chinese internal code of character string to be shown is converted to according to the second preset rules character string to be shown
Code；
S5, the Hanzi section-position code according to character string to be shown, search default chinese character storehouse, obtain every according to the 3rd preset rules
The corresponding character pattern data of individual character；
S6, the font size that character pattern data is expanded to user's setting, obtain character pattern data to be shown, and then to type matrix to be shown
Each of data is judged, " 0 " position and " 1 " position is filled respectively the progress of OSD buffer areas is sent to after different yuv datas
Display；
First preset rules are：
Chinese internal code=0x03+0xa0 of the corresponding high byte of English character；
ASCII character-the 32+0xa0 of Chinese internal code=English character of the corresponding low byte of English character.
2. a kind of string processing display methods based on davinci platform according to claim 1, it is characterised in that institute
State the HZK16 character libraries that default chinese character storehouse uses 16 × 16.
3. a kind of string processing display methods based on davinci platform according to claim 1, it is characterised in that institute
Step S2 is stated, it is specially：
Search each byte of the internal code of character string to be shown and judge whether the byte is less than 0x80, if so, then judging to be somebody's turn to do
Byte is English character, otherwise is chinese character, finally obtains all English characters in character string to be shown.
4. a kind of string processing display methods based on davinci platform according to claim 1, it is characterised in that institute
Stating the second preset rules is：
High byte-the 0xa0 of the Chinese internal code of the Chinese character area code=character of character；
Low byte-the 0xa0 of the Chinese internal code of Chinese character bit code=character of character.
5. a kind of string processing display methods based on davinci platform according to claim 1, it is characterised in that institute
Stating the 3rd preset rules is：
The first address in the index position of character correspondence character pattern data=default chinese character storehouse+（94×（Chinese character area code -1）+（Chinese character
Bit code -1））×32.
6. a kind of string processing display methods based on davinci platform according to claim 1, it is characterised in that institute
The step of character pattern data is expanded into the font size of user's setting described in step S6 is stated, it is specially：
Obtain extension multiple m after the font size divided by the original size of character pattern data that user are set according to following formula, and then will
The every bit of character pattern data is extended to m2Individual point：
m= p/ n
In above formula, p represents the font size b [p] [p] of user's setting exponent number, and n represents the original size a [n] of character pattern data
The exponent number of [n], m is positive integer.
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| CN106803904A (en) * | 2016-11-24 | 2017-06-06 | 德为显示科技股份有限公司 | A kind of liquid crystal display OSD display methods and system |
| CN107578458A (en) * | 2017-09-14 | 2018-01-12 | 北京邮电大学 | A kind of method for drafting and device of aircraft running situation figure |
| CN109375962A (en) * | 2018-10-23 | 2019-02-22 | 北京计算机技术及应用研究所 | The implementation method of chinese character mixing output display based on embedded OS |
| CN111276110B (en) * | 2018-12-04 | 2021-10-19 | 杭州海康威视数字技术股份有限公司 | Character display method and device and electronic equipment |
| CN114063952A (en) * | 2021-10-22 | 2022-02-18 | 无锡蓝天电子股份有限公司 | Chinese character display method of liquid crystal screen of single chip microcomputer |
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| CN101847050A (en) * | 2010-05-18 | 2010-09-29 | 四川长虹电器股份有限公司 | Simple Chinese input and display method in embedded product |
| CN203134325U (en) * | 2013-03-19 | 2013-08-14 | 赵雪琴 | Wireless LED electronic display screen |
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