CN104639854A - String processing display method based on Davinci platform - Google Patents
String processing display method based on Davinci platform Download PDFInfo
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Abstract
The invention discloses a string processing display method based on a Davinci platform. The string processing display method comprises the following steps of acquiring to-be-displayed Chinese-English bilingual character strings; searching internal machine codes of the to-be-displayed character strings, performing recognition and judgment and obtaining all English characters; converting ASCII (American Standard Code For Information Interchange) of the obtained English character of each byte into Chinese machine codes of two corresponding bytes in a preset Chinese character library and finally obtaining the Chinese machine codes of the to-be-displayed character strings; converting the Chinese machine codes of the to-be-displayed character strings into Hanzi section-position codes; searching in the preset Chinese character library and obtaining typehead data corresponding to each character; and expanding the typehead data till the font size set by a user, further judging each byte, filling 0-byte and 1-byte with different YUV (Luma and Charoma) data, then transmitting to an OSD (On Screen Display) buffer area and displaying. The method is capable of dynamically displaying the Chinese-English bilingual characters, realizing display of multiple font sizes and greatly saving system resources, and can be widely applied to the field of the OSD.
Description
Technical field
The present invention relates to the OSD text addition Display Technique of field of video processing, particularly relate to a kind of string processing display packing based on davinci platform.
Background technology
In field of video monitoring, normal use OSD(On Screen Display, on-chip study) information such as the time of video scene, place are added in video image by the mode of word by technology, and in actual application, user likely needs more self-defined Word messages to be added in monitor video.By the new platform that the davinci platform abroad introduced is a kind of digital picture, video, voice, Audio Signal Processing, davinci platform does not support the process of Chinese character substantially, therefore, the OSD Overlapping display of Chinese and English character mixing is a major issue of the video monitoring system needs solution based on davinci platform.
In the embedded development process of video monitoring system, system often only supports the display of standard A SCII code, does not support chinese disply, therefore needs the problem solving chinese disply.For the occasion that display word seldom changes, can by the problem adopting the method for self-control Chinese character base to solve chinese disply, the dot array data of a small amount of Chinese character needed for namely extracting from Hanzi font library, form homemade small-sized character library, such equipment can show fixing several Chinese characters.But this mode can not meet the dynamic need of OSD Word message, the Chinese character of display cannot be changed according to the actual requirements at any time.And, this mode, the Chinese character style that realize showing different size then must store the dot matrix word library of different size, needs more system resource, the Chinese dot matrix word library of such as 16 × 16 just needs the system resource being greater than 200K, and this is great waste to system resource.
Summary of the invention
In order to solve above-mentioned technical problem, the object of this invention is to provide a kind of string processing display packing based on davinci platform.
The technical solution adopted for the present invention to solve the technical problems is:
Based on a string processing display packing for davinci platform, comprising:
The character string to be shown of S1, the mixing of acquisition Chinese and English;
S2, search character string to be shown internal code and carry out identification judge, obtain all English characters in character string to be shown;
S3, according to the first preset rules, the ASCII character of English character of each byte obtained is converted to the Chinese internal code of two bytes corresponding in default Chinese character storehouse, finally obtains the Chinese internal code of character string to be shown;
S4, according to the second preset rules, the Chinese internal code of character string to be shown is converted to the Hanzi section-position code of character string to be shown;
S5, Hanzi section-position code according to character string to be shown, search default Chinese character storehouse, obtain character pattern data corresponding to each character according to the 3rd preset rules;
S6, character pattern data expanded to the font size of user's setting, obtain character pattern data to be shown, and then each of character pattern data to be shown is judged, be sent to OSD buffer area after different yuv datas is filled respectively to " 0 " position and " 1 " position and show.
Further, described default Chinese character storehouse adopts the HZK16 character library of 16 × 16.
Further, described step S2, it is specially:
Search each byte of the internal code of character string to be shown and judge whether this byte is less than 0x80, if so, then judging that this byte is English character, otherwise be Chinese character, finally obtain all English characters in character string to be shown.
Further, described first preset rules is:
Chinese internal code=the 0x03+0xa0 of the high byte that English character is corresponding;
ASCII character-the 32+0xa0 of the Chinese internal code=English character of the low byte that English character is corresponding.
Further, described second preset rules is:
High byte-the 0xa0 of the Chinese internal code of the Chinese character district code=character of character;
Low byte-the 0xa0 of the Chinese internal code of the Chinese character bit code=character of character.
Further, described 3rd preset rules is:
First address+(94 × (Chinese character district code-1)+(Chinese character bit code-1)) × 32 in the index position=default Chinese character storehouse of the corresponding character pattern data of character.
Further, described in described step S6, character pattern data is expanded to the step of the font size of user's setting, it is specially:
Expand multiple m according to the font size that user sets by following formula divided by obtaining after the original size of character pattern data, and then the every bit of character pattern data is extended to m
2individual point:
m= p/ n
In above formula, p represents the exponent number of font size b [p] [p] that user sets, and n represents the exponent number of original size a [n] [n] of character pattern data, and m is positive integer.
The invention has the beneficial effects as follows: a kind of string processing display packing based on davinci platform of the present invention, comprising: the character string to be shown of S1, the mixing of acquisition Chinese and English; S2, search character string to be shown internal code and carry out identification judge, obtain all English characters in character string to be shown; S3, according to the first preset rules, the ASCII character of English character of each byte obtained is converted to the Chinese internal code of two bytes corresponding in default Chinese character storehouse, finally obtains the Chinese internal code of character string to be shown; S4, according to the second preset rules, the Chinese internal code of character string to be shown is converted to the Hanzi section-position code of character string to be shown; S5, Hanzi section-position code according to character string to be shown, search default Chinese character storehouse, obtain character pattern data corresponding to each character according to the 3rd preset rules; S6, character pattern data expanded to the font size of user's setting, obtain character pattern data to be shown, and then each of character pattern data to be shown is judged, be sent to OSD buffer area after different yuv datas is filled respectively to " 0 " position and " 1 " position and show.This method can Dynamic Announce Chinese and English mixed characters, and the default Chinese character storehouse of a kind of size that only need prestore, just can realize the display of multiple fonts size, effectively save the memory headroom storing multiple size character repertoire, for in embedded system, greatly system resource can be saved.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the schematic flow sheet of a kind of string processing display packing based on davinci platform of the present invention;
Fig. 2 is the relation schematic diagram between the internal code of Chinese character " ", GB and region-position code shown in embodiments of the invention two;
Fig. 3 is the dot matrix font schematic diagram of the character pattern data of 16 × 16 of Chinese character " ";
Fig. 4 is dot matrix font schematic diagram character pattern data in Fig. 3 being expanded to 32 × 32 of rear acquisition;
Fig. 5 is the method schematic diagram of in embodiments of the invention two, the character pattern data to be shown obtained being filled to yuv data.
Embodiment
With reference to Fig. 1, the invention provides a kind of string processing display packing based on davinci platform, comprising:
The character string to be shown of S1, the mixing of acquisition Chinese and English;
S2, search character string to be shown internal code and carry out identification judge, obtain all English characters in character string to be shown;
S3, according to the first preset rules, the ASCII character of English character of each byte obtained is converted to the Chinese internal code of two bytes corresponding in default Chinese character storehouse, finally obtains the Chinese internal code of character string to be shown;
S4, according to the second preset rules, the Chinese internal code of character string to be shown is converted to the Hanzi section-position code of character string to be shown;
S5, Hanzi section-position code according to character string to be shown, search default Chinese character storehouse, obtain character pattern data corresponding to each character according to the 3rd preset rules;
S6, character pattern data expanded to the font size of user's setting, obtain character pattern data to be shown, and then each of character pattern data to be shown is judged, be sent to OSD buffer area after different yuv datas is filled respectively to " 0 " position and " 1 " position and show.
Be further used as preferred embodiment, described default Chinese character storehouse adopts the HZK16 character library of 16 × 16.
Be further used as preferred embodiment, described step S2, it is specially:
Search each byte of the internal code of character string to be shown and judge whether this byte is less than 0x80, if so, then judging that this byte is English character, otherwise be Chinese character, finally obtain all English characters in character string to be shown.
Be further used as preferred embodiment, described first preset rules is:
Chinese internal code=the 0x03+0xa0 of the high byte that English character is corresponding;
ASCII character-the 32+0xa0 of the Chinese internal code=English character of the low byte that English character is corresponding.
Be further used as preferred embodiment, described second preset rules is:
High byte-the 0xa0 of the Chinese internal code of the Chinese character district code=character of character;
Low byte-the 0xa0 of the Chinese internal code of the Chinese character bit code=character of character.
Be further used as preferred embodiment, described 3rd preset rules is:
First address+(94 × (Chinese character district code-1)+(Chinese character bit code-1)) × 32 in the index position=default Chinese character storehouse of the corresponding character pattern data of character.
Be further used as preferred embodiment, described in described step S6, character pattern data is expanded to the step of the font size of user's setting, it is specially:
Expand multiple m according to the font size that user sets by following formula divided by obtaining after the original size of character pattern data, and then the every bit of character pattern data is extended to m
2individual point:
m= p/ n
In above formula, p represents the exponent number of font size b [p] [p] that user sets, and n represents the exponent number of original size a [n] [n] of character pattern data, and m is positive integer.
Below in conjunction with specific embodiment, the present invention will be further described.
Embodiment one
With reference to Fig. 1, a kind of string processing display packing based on davinci platform, comprising:
The character string to be shown of S1, the mixing of acquisition Chinese and English;
S2, search character string to be shown internal code and carry out identification judge, obtain all English characters in character string to be shown, specific as follows:
Search each byte of the internal code of character string to be shown and judge whether this byte is less than 0x80, if so, then judging that this byte is English character, otherwise be Chinese character, finally obtain all English characters in character string to be shown.Because English character adopts ASCII character to represent, and the coding range of ASCII character is 0 ~ 127, the first place of each byte of the internal code of Chinese character is all 1, namely the internal code of each byte of Chinese character is all more than or equal to 128,128(and 0x80 is less than when retrieving a certain byte) time, can determine that this byte is the ASCII character of English character.
S3, according to the first preset rules, the ASCII character of English character of each byte obtained is converted to the Chinese internal code of two bytes corresponding in default Chinese character storehouse, finally obtains the Chinese internal code of character string to be shown; In the present embodiment, preset the HZK16 character library that Chinese character storehouse adopts 16 × 16.
First preset rules is: the Chinese internal code=0x03+0xa0 of the high byte that English character is corresponding; ASCII character-the 32+0xa0 of the Chinese internal code=English character of the low byte that English character is corresponding.
English character to be mapped in default Chinese character storehouse mixed display after the Chinese internal code of two corresponding bytes by this method.
S4, according to the second preset rules, the Chinese internal code of character string to be shown is converted to the Hanzi section-position code of character string to be shown; Region-position code comprises district's code and bit code;
Second preset rules is: the high byte-0xa0 of the Chinese internal code of the Chinese character district code=character of character; Low byte-the 0xa0 of the Chinese internal code of the Chinese character bit code=character of character.
S5, Hanzi section-position code according to character string to be shown, search default Chinese character storehouse, obtain character pattern data corresponding to each character according to the 3rd preset rules;
3rd preset rules is: first address+(94 × (Chinese character district code-1)+(Chinese character bit code-1)) × 32 in the index position=default Chinese character storehouse of the corresponding character pattern data of character.
S6, character pattern data expanded to the font size of user's setting, obtain character pattern data to be shown, and then each of character pattern data to be shown is judged, be sent to OSD buffer area after different yuv datas is filled respectively to " 0 " position and " 1 " position and show.This method only need prestore a kind of default Chinese character storehouse of size, just can realize the display of multiple fonts size, effectively save the memory headroom storing multiple size character repertoire, in embedded system, greatly can save system resource.
In this step, character pattern data is expanded to the step of the font size of user's setting, it is specially:
Expand multiple m according to the font size that user sets by following formula divided by obtaining after the original size of character pattern data, and then the every bit of character pattern data is extended to m
2individual point:
m= p/ n
In above formula, p represents the exponent number of font size b [p] [p] that user sets, and n represents the exponent number of original size a [n] [n] of character pattern data, and m is positive integer.
Character pattern data adopts lattice matrix to represent, the font size of user's setting is also a lattice matrix, in the present embodiment, the original size of character pattern data is matrix a [n] [n], the font size of user's setting is matrix b [p] [p], then expand multiple m=p/n, the every bit of the lattice matrix of character pattern data is extended to m
2individual point, suppose the lattice matrix that a [i] [j] is character pattern data a bit, then will all be given the value of a [i] [j] in the matrix after expansion by the point within the scope of a b [m*i] [m*j], b [m*i] [m*j+ (m-1)], b [m*i+ (m-1)] [m*j], b [m*i+ (m-1)] [m*j+ (m-1)] 4 square formations surrounded.
Embodiment two
The present embodiment is based on the headend equipment of video monitoring system, this headend equipment is a kind of embedded processing platform-davinci platform, the OSD scheme of this platform can only show the ASCII character of standard and fixing several Chinese character, putting before this, the present embodiment proposes a kind of string processing display packing based on davinci platform that can show all Chinese and English characters, with reference to Fig. 1, its concrete steps are as follows:
Step 1, first in embedded development process, HZK16 character library is put in processing platform, HZK16 character library is 16 × 16 dot matrix word libraries meeting GB2312 standard, the Chinese character that the GB2312-80 of HZK16 supports has 6763, symbol 682, wherein first-level Chinese characters has 3755, and the Chinese characters of level 2 have 3008.
Step 2, acquisition User Defined Chinese and English mixed characters string, i.e. character string to be shown, such as unsigned char osd []=" XTE welcomes you! ".
Step 3, " XTE welcomes you to analyze known character string! " in " XTE! " can character be shown for ASCII character; " welcoming you " is Chinese character; an ASCII character is a byte, and a GB2312 Chinese character is by two byte codes, and the internal code of whole character string is: 0x58 0x54 0x45 0xbb 0xb6 0xd3 0xad 0xc4 0xfa 0x21.
Step 4, above character string internal code carried out to identification and judge: judge each byte, search the byte being less than 0x80 to have: 0x58 0x54 0x45 0x21, therefore the position osd [0] of the English character in character string is just found, osd [1], osd [2], osd [9], other is Chinese character.
Step 5, table 1 as follows are the mapping relations tables that ASCII character can show between the coding of character and corresponding Hanzi section-position code, and as can be seen from Table 1, all ASCII character can show the Chinese character district code=0x03 of character, Chinese character bit code=ASCII character-32.The relation that what Fig. 2 showed is between the internal code of a Chinese character " ", GB and region-position code, summing up the first preset rules obtaining the Chinese internal code ASCII character of English character being converted to two bytes corresponding in default Chinese character storehouse is: the Chinese internal code=0x03+0xa0 of the high byte that English character is corresponding; ASCII character-the 32+0xa0 of the Chinese internal code=English character of the low byte that English character is corresponding." XTE welcomes you like this! " internal code of 10 bytes is the Chinese internal code of 14 bytes after changing: 0xa3 0xd8 0xa3 0xd4 0xa3 0xc5 0xbb 0xb6 0xd3 0xad 0xc4 0xfa 0xa3 0xa1.
The mapping relations table of table 1 ASCII character and Hanzi section-position code
Step 6, summary Fig. 2 can obtain the relation between Chinese internal code and region-position code, in Fig. 2, for Chinese character " ", its Chinese character district code 00010000=internal code high byte 10110000-10100000 (0xa0), Chinese character bit code=internal code low byte-0xa0.Therefore, the second preset rules Chinese internal code being converted to Hanzi section-position code is as follows: the high byte-0xa0 of the Chinese internal code of the Chinese character district code=character of character; Low byte-the 0xa0 of the Chinese internal code of the Chinese character bit code=character of character.According to the second preset rules, conversion is carried out to the Chinese internal code that step 5 obtains and can obtain that " XTE welcomes you! " Hanzi section-position code.
Step 7, according to " XTE welcomes you! " Hanzi section-position code, calculate the index position of character pattern data corresponding to each character, find in HZK16 character library and obtain character pattern data corresponding to each character.Each Chinese character in HZK16 character library needs 16 × 16=256 point to show, and the character pattern data of a Chinese character is 256/8=32 byte, can obtain character pattern data corresponding to character according to index position.3rd preset rules of computation index position is: first address+(94 × (Chinese character district code-1)+(Chinese character bit code-1)) × 32 in the index position=default Chinese character storehouse of the corresponding character pattern data of character.
After step 8, step 7 are searched and obtained character pattern data corresponding to each character, the font size according to user's setting is expanded character pattern data, obtains character pattern data to be shown.In the present embodiment, the font size of user's setting has 16 × 16,32 × 32,48 × 48,64 × 64 4 kinds of schemes, and the scheme carrying out expanding is as follows:
Suppose that the original size of character pattern data is matrix a [n] [n], the font size of user's setting namely expand after font size be b [p] [p], then expand multiple m=p/ n, the every bit of character pattern data be extended to m
2individual, n=16 in the present embodiment.If the font size of user's setting is 32 × 32, then p=32, m=2, m
2=4, each point of the original matrix of character pattern data is extended to 4 points, 256 points are extended to 256*22=1024 point.With reference to Fig. 3, shown in Fig. 4, Fig. 3 is the dot matrix font schematic diagram of the character pattern data of 16 × 16 of Chinese character " ", Fig. 4 is dot matrix font schematic diagram character pattern data in Fig. 3 being expanded to 32 × 32 of rear acquisition, suppose the lattice matrix that a [i] [j] is character pattern data a bit, then by expansion after matrix in by a b [m*i] [m*j], b [m*i] [m*j+ (m-1)], b [m*i+ (m-1)] [m*j], point within the scope of b [m*i+ (m-1)] [m*j+ (m-1)] 4 square formations surrounded all gives the value of a [i] [j].When the font size that user sets is as other numerical value, also adopts and expand in the same way.
Step 9, each of character pattern data to be shown to be judged, be sent to OSD buffer area after different yuv datas is filled respectively to " 0 " position and " 1 " position and show.The processing platform of the practical application of the present embodiment uses YUV422 data, the spread pattern of YUV422 data in internal memory is: Y0U0Y1V0Y2U1Y3V1 two pixels share one group of UV data, namely pixel 2 byte datas represent, for this data of YUV422, we only need be different with " 1 " data stuffing to " 0 " Y data value, identical value is composed to UV data, Fig. 5 shows a kind of method example of simple process yuv data to reach the object of Charactes Display, the different yuv data " 0xff 0x7d " of Y value and " 0x00 0x7d " are filled to " 0 " position and " 1 " position.YUV value is filled by various method in actual use procedure.After filling, sent into by yuv data and possessed in the OSD buffer area of osd function system, this yuv data can superpose in vision signal by system automatically, and such screen just can demonstrate the Chinese character of intensity contrast.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (7)
1., based on a string processing display packing for davinci platform, it is characterized in that, comprising:
The character string to be shown of S1, the mixing of acquisition Chinese and English;
S2, search character string to be shown internal code and carry out identification judge, obtain all English characters in character string to be shown;
S3, according to the first preset rules, the ASCII character of English character of each byte obtained is converted to the Chinese internal code of two bytes corresponding in default Chinese character storehouse, finally obtains the Chinese internal code of character string to be shown;
S4, according to the second preset rules, the Chinese internal code of character string to be shown is converted to the Hanzi section-position code of character string to be shown;
S5, Hanzi section-position code according to character string to be shown, search default Chinese character storehouse, obtain character pattern data corresponding to each character according to the 3rd preset rules;
S6, character pattern data expanded to the font size of user's setting, obtain character pattern data to be shown, and then each of character pattern data to be shown is judged, be sent to OSD buffer area after different yuv datas is filled respectively to " 0 " position and " 1 " position and show.
2. a kind of string processing display packing based on davinci platform according to claim 1, is characterized in that, described default Chinese character storehouse adopts the HZK16 character library of 16 × 16.
3. a kind of string processing display packing based on davinci platform according to claim 1, it is characterized in that, described step S2, it is specially:
Search each byte of the internal code of character string to be shown and judge whether this byte is less than 0x80, if so, then judging that this byte is English character, otherwise be Chinese character, finally obtain all English characters in character string to be shown.
4. a kind of string processing display packing based on davinci platform according to claim 1, it is characterized in that, described first preset rules is:
Chinese internal code=the 0x03+0xa0 of the high byte that English character is corresponding;
ASCII character-the 32+0xa0 of the Chinese internal code=English character of the low byte that English character is corresponding.
5. a kind of string processing display packing based on davinci platform according to claim 1, it is characterized in that, described second preset rules is:
High byte-the 0xa0 of the Chinese internal code of the Chinese character district code=character of character;
Low byte-the 0xa0 of the Chinese internal code of the Chinese character bit code=character of character.
6. a kind of string processing display packing based on davinci platform according to claim 1, is characterized in that, described 3rd preset rules is:
First address+(94 × (Chinese character district code-1)+(Chinese character bit code-1)) × 32 in the index position=default Chinese character storehouse of the corresponding character pattern data of character.
7. a kind of string processing display packing based on davinci platform according to claim 1, is characterized in that, described in described step S6, character pattern data is expanded to the step of the font size of user's setting, it is specially:
Expand multiple m according to the font size that user sets by following formula divided by obtaining after the original size of character pattern data, and then the every bit of character pattern data is extended to m
2individual point:
m= p/ n
In above formula, p represents the exponent number of font size b [p] [p] that user sets, and n represents the exponent number of original size a [n] [n] of character pattern data, and m is positive integer.
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| 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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