CN1710946A - Method for overlaying character on digital picture - Google Patents
Method for overlaying character on digital picture Download PDFInfo
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- CN1710946A CN1710946A CN 200510050635 CN200510050635A CN1710946A CN 1710946 A CN1710946 A CN 1710946A CN 200510050635 CN200510050635 CN 200510050635 CN 200510050635 A CN200510050635 A CN 200510050635A CN 1710946 A CN1710946 A CN 1710946A
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Abstract
The method includes steps: generating dot matrix font library file including typical characters in dot matrix composed of N columnsxM lows, down loading the said file to a area of dynamic memory; storing a inputted frame of digital video image to be superposed a character on into a buffer of dynamic memory; fetching a low (N pieces of bit) of a character in dot matrix to be superposed from storage area of area of font library; if a bit in N bits is 1, then changing brightness value of the pixel corresponding to the bit; if a bit in N bits is 0, then not changing brightness value of the pixel corresponding to the bit; based on the rule, superposition of N pieces of pixel is completed. According to the said superposition method, the procedure is carried on till M low of character in dot matrix is completed. Advantages are: easy to expand character by adding new character in dot matrix without need of designing new hard ware.
Description
Technical field
The present invention relates to a kind of on digital picture the method for overlaying character, be the method that shows symbolic information such as numeral, letter, Chinese character about stack on digital picture, belong to the digital image processing techniques field.
Background technology
The character stack is also referred to as OSD (On Screen Display shows) on screen, be a kind of common image processing techniques, is applied in widely in the video systems such as monitoring, TV.
At present, character stack implementation commonly used is to adopt special-purpose character generator to add controller (CPU) chip to realize, for example: the STV5730A chip of company of STMicw Electronics (SGS-THOMSON), can be with reference to relevant paper of " TV tech " 2003 the 9th phases, its groundwork process is: the simulation original image is input to special character generator chip, behind the character of appointment that superposeed, by special character generator chip output simulation vision-mix.Whole additive process is finished by special character generator chip, the character of required stack is realized by the character that stores among the special character generator chip interface circuit addressing character generator chip internal ROM by controller (CPU), so when using similar special character generator chip, the character kind that can realize depend on the chip that is adopted fully.Because the restriction of cost, application etc., the stackable character of this type of special character generator generally has only 10 Arabic numerals, 26 English alphabets of capital and small letter, and a small amount of other symbol, the various characters that are difficult to satisfy in the monitoring image show that the stack of demand, especially Chinese character shows demand.Stack shows Chinese character if desired, then except that using some special character generator chip, also need to increase again in addition a slice Hanzi font library chip, for example store the rom chip of Hanzi font library, further increased cost, simultaneously since compatible relatively poor between the various special character generator chips also bother very much so realize function expansion and upgrading.
Summary of the invention
The objective of the invention is in order to improve the deficiency that existing character stack implementation method exists, and provide a kind of on digital picture the method for overlaying character.
The technical solution used in the present invention comprises the steps:
Suppose that dot character to be superimposed is made up of N * M dot matrix, wherein M is the row dot matrix, and N is the row dot matrix, and M, N are positive integers
The a certain storage area of dynamic memory is downloaded and stored into to the conventional characters dot character library file that 1) will generate in advance;
2) a frame of digital video image of the character to be superimposed that will import stores in the dynamic memory buffering area;
3) search dot character to be superimposed in dynamic memory library stores district, taking-up is formed the first row N position of this dot character and is represented by binary digit;
4) from dynamic storage buffer, take out the corresponding N that this two field picture is intended the overlaying character position
0Individual picture element brightness value, N
0=N;
5) finish N
0The stack of individual picture element:
If the brightness value of a certain picture element is Y, with 1 byte representation, the brightness value of character to be superimposed is a constant C, with 1 byte representation, a certain position in certain delegation N position of this dot character of composition that has taken out is 1, and then the brightness value Y with this corresponding picture element in the original image changes C into, if this position is 0, then keep in the original image brightness value of this corresponding picture element constant,, finish N according to this principle
0The stack of individual picture element;
6) get the next line N position of forming this dot character, and represent, take out the N of image next line correspondence with the binary digit form
0Individual picture element brightness value, set by step 5) finish N
0The stack of individual picture element; Repeat this process up to capable the disposing of all M of forming this dot character, can finish the stack of a dot character.
A point in the described technical scheme in the dot character is meant bit, and its value is 0 or 1.During overlap-add operation, a picture element on the corresponding digital picture of each binary digit.The conventional characters dot character library file comprises 10 Arabic numerals, 26 English alphabets of capital and small letter, Chinese characters in common use and other symbol that needs.
Described step 2) digital video image is meant through the original digital image after the A/D conversion chip analog-to-digital conversion.
The search procedure of described step 3) comprises: if the character that will superpose does not exist, then need to revise font file in the library stores district, increase this character and lay equal stress on newly downloaded.
In described technic relization scheme, the overlaying character process utilizes general dsp chip partial arithmetic ability to realize.In the superposeed digital picture of designated character or symbol of image assigned address, compress processing by the general dsp chip again after, give the rear end equipment storage or show.
The invention has the beneficial effects as follows:
(1) owing to the novel unique implementation of the present invention, the expansion of character is simple, only needs the new dot character of increase, just can support any language and corresponding characters thereof, need not to upgrade hardware designs, and range of application more extensively, flexibly.
(2) with respect to the implementation of using special character generator chip, character overlapping method of the present invention has removed the dependence to special character generator chip, has simplified The Hardware Design, has reduced cost, and structure is more succinct, compact.
Description of drawings
Fig. 1 is the flow chart of the inventive method;
Fig. 2 is schematic diagram that digital character pattern is represented of the pre-generation of the present invention;
Fig. 3 is be added to a process schematic diagram on the image of dot matrix digit character of the present invention, and the empty circles among the figure is represented picture element;
Fig. 4 is the pre-schematic diagram that generates a Chinese character point matrix representation of the present invention;
Fig. 5 is be added to a process schematic diagram on the image of dot matrix Chinese character character of the present invention, and the empty circles among the figure is represented picture element.
Embodiment
Below in conjunction with accompanying drawing, describe the method for the present invention's overlaying character on digital picture in detail.
Referring to Fig. 1, the present invention's method of overlaying character on digital picture may further comprise the steps: suppose that dot character to be superimposed is made up of N * M dot matrix, wherein M is the row dot matrix, and N is the row dot matrix, and M, N are positive integers
The a certain storage area of dynamic memory is downloaded and stored into to the conventional characters dot character library file that 1) will generate in advance;
2) a frame of digital video image of the character to be superimposed that will import stores in the dynamic memory buffering area;
3) search dot character to be superimposed in dynamic memory library stores district, taking-up is formed the first row N position of this dot character and is represented by binary digit;
4) from dynamic storage buffer, take out corresponding N0 the picture element brightness value that this two field picture is intended the overlaying character position, N
0=N;
5) finish N
0The stack of individual picture element:
If the brightness value of a certain picture element is Y, with 1 byte representation, the brightness value of character to be superimposed is a constant C, with 1 byte representation, a certain position in certain delegation N position of this dot character of composition that has taken out is 1, represents the part that this point is a character, needs stack, then the brightness value Y with this corresponding picture element in the original image changes C into, if this position is 0, represent that this point does not belong to this character, then keep in the original image brightness value of this corresponding picture element constant, according to this principle, finish N
0The stack of individual picture element;
6) get the next line N position of forming this dot character, and represent, take out the N of image next line correspondence with the binary digit form
0Individual picture element brightness value, set by step 5) finish N
0The stack of individual picture element; Repeat this process up to capable the disposing of all M of forming this dot character, can finish the stack of a dot character.
Generally speaking, various characters, symbol can be represented and are stored in the character library with the form of dot matrix.In the dot character generative process, generally use bit 1 to represent a point of this character correspondence, all the other points of dot matrix are filled with binary digit 0.
Generate on the image character pattern character library commonly used among the present invention in advance, such as 10 Arabic numerals, 26 English alphabets of capital and small letter, other symbol of Chinese characters in common use (as big, door, walk, Chinese characters such as corridor, road, mouth) and needs, and be stored as font file.
We know that the most basic component units of digital picture is a picture element, a point in each picture element correspondence image, and a plurality of picture elements of level and vertical direction two-dimensional arrangements have just been formed piece image.In dynamic memory inside, image represents with the form of two-dimensional lattice and stores that each picture element all has brightness (Y component) and the chrominance information (UV component) of oneself.For example, a frame resolution is 704 * 576 image, and its luminance signal has 576 row, every row 704 row, if the brightness value of each picture element with 1 byte representation, so, the entire image luminance component takies 704 * 576=405504 bytes of memory space altogether.
The key that the present invention realizes just is to use the defined character of dot matrix word library to describe, and the superposed positions picture element is intended in character in the image handle.Each picture element of intending overlaying character all contains brightness (Y component) and chromatic component (UV component), and simple character stack can realize that the monochromatic stack of black and white shows only to the brightness operation of image.Brightness value is with a byte representation, and promptly span is 0～255, and brightness strengthens gradually, and brightness value is that 0 to represent black, brightness value be 255 to represent white.
Embodiment 1, the implementation procedure of overlaying character on digital picture " 2 "
Fig. 2 is the some matrix representation of Arabic numerals " 2 ", total horizontal direction 16 row, vertical direction 8 row, i.e. 8 * 16 dot matrix.In the some matrix representation of correspondence, need 8 * 16=128bit, i.e. 16 bytes altogether.So 16 bytes of particular combinations are just represented the character " 2 " of 8 * 16 dot matrix.
1) dot matrix word library that comprises character " 2 " that generates in advance is stored on the hard disk with the form of file, when the image encoding compressibility is started working and need overlaying character to show, font file is downloaded and is stored into a certain zone of dynamic memory (DDR SDRAM).
2) the frame of digital video image of handling the character to be superimposed of back generation through the A/D change-over circuit by the simulation raw video image that will import stores in the dynamic memory buffering area.
3) dot matrix of character " 2 " is expressed as 16 bytes, and 128, corresponding 128 picture elements (as shown in Figure 3) on the digital picture that is added to.
If the brightness value of a certain picture element is Y, with 1 byte representation; The brightness value of character to be superimposed is a constant C, with 1 byte representation, for example, C=0 * 80; The size of establishing original digital image simultaneously is 704 * 576.
Search dot character to be superimposed " 2 " in the library stores district of dynamic memory, taking-up is formed first byte of this dot character and is represented by binary digit.Because each of character put a picture element in the corresponding real figure image in the character library, therefore, 8 picture elements in the corresponding real figure image of a byte (8) in the dot character " 2 ".
4) take out 8 continuous image vegetarian refreshments of correspondence that this two field picture is intended the overlaying character position.According to the plan superimposed rows column position of character to be superimposed in original digital image of appointment, from dynamic memory, take out the picture element brightness value of wanting overlaying character accordingly.
The memory address of picture element brightness value in dynamic memory calculated as follows: first stack original position (origin position) on image of supposition dot character " 2 " upper left corner is Left (row coordinate), Top (row-coordinate), this two field picture is stored the base address in memory be P, then the picture element brightness value address in dot character " 2 " any point correspondence image is: P+ (Top+ is capable) * 704+ (Left+ row), row, column parameter in the expression formula be certain a bit respectively with respect to Top, the side-play amount of Left.In our embodiment, P can be effective SDRAM address, for example P=0 * 80040000; Left, Top are specified by the user, for example the 2nd go the 1st row, Left=0 then, Top=1 is if take out the image pixel point of the 1st row the 1st row dot matrix correspondence, then the row, column parameter is 0, this picture element address=0 * 80040000+1 * 704+0=0 * 800402C0H.Continuous 8 bytes from take out this address need 8 the picture element brightness values of first row that superpose exactly.
5) finish the stack of 8 picture elements.Particularly be exactly certain delegation's dot matrix of forming this dot character (refer to here taken out first byte), promptly each in 8 is carried out following operation: if this position is 1, then the brightness value Y with this corresponding picture element in the original image changes constant C into; If this position is 0, then keep in the original image brightness value of this corresponding picture element constant.
6) get 8 of next lines forming this dot character, and represent, take out 8 picture element brightness values of image next line correspondence, set by step 5 with the binary digit form) finish the stack of 8 picture elements.Repeat this process, can finish the stack of a dot character.
Finish the overlap-add procedure of a plurality of characters in the two field picture, the stack implementation procedure of a dot character that has illustrated above only needing to repeat.
Embodiment 2, the implementation procedure of the Chinese character that superposes on digital picture " road "
The implementation procedure of present embodiment is substantially the same manner as Example 1, and difference is to form the dot matrix difference of character, as shown in Figure 4.Chinese character is generally represented with 16 * 16,24 * 24 dot matrix.Suppose that Chinese character " road " is made up of 16 * 16 dot matrix.Total horizontal direction 16 row, vertical direction 16 row, i.e. 16 * 16 dot matrix.In the some matrix representation of correspondence, need 16 * 16=256bit, i.e. 32 bytes altogether.So 32 bytes of particular combinations are just represented the character " road " of 16 * 16 dot matrix.
1) dot matrix word library that comprises character " road " that generates in advance is stored on the hard disk with the form of file, when the image encoding compressibility is started working and need overlaying character to show, font file is downloaded and is stored into a certain zone of dynamic memory (DDR SDRAM).
2) the frame of digital video image of handling the character to be superimposed of back generation through the A/D change-over circuit by the simulation raw video image that will import stores in the dynamic memory buffering area.
3) dot matrix of character " road " is expressed as 32 bytes, and 256, corresponding 256 picture elements (as shown in Figure 5) on the digital picture that is added to.
If the brightness value of a certain picture element is Y, with 1 byte representation; The brightness value of character to be superimposed is a constant C, with 1 byte representation, for example, C=0 * 80; The size of establishing original digital image simultaneously is 704 * 576.
Search dot character to be superimposed " road " in the library stores district of dynamic memory, taking-up is formed first word (2 bytes) of this dot character and is represented by binary digit.Because each of character put a picture element in the corresponding real figure image in the character library, therefore, 16 picture elements in the corresponding real figure image of 2 bytes (16) in the dot character " road ".
4) take out 16 continuous image vegetarian refreshments of correspondence that this two field picture is intended the overlaying character position.According to the plan superimposed rows column position of character to be superimposed in original digital image of appointment, from dynamic memory, take out the picture element brightness value of wanting overlaying character accordingly.
The memory address of picture element brightness value in dynamic memory calculated as follows: first stack original position (origin position) on image of supposition dot character " road " upper left corner is Left (row coordinate), Top (row-coordinate), this two field picture is stored the base address in memory be P, then the picture element brightness value address in dot character " road " any point correspondence image is: P+ (Top+ is capable) * 704+ (Left+ row), row, column parameter in the expression formula be certain a bit respectively with respect to Top, the side-play amount of Left.In our embodiment, P can be effective SDRAM address, for example P=0 * 80040000; Left, Top are specified by the user, for example the 2nd go the 1st row, Left=0 then, Top=1 is if take out the image pixel point of the 2nd row the 1st row dot matrix correspondence, then line parameter=1, row parameter=0, this picture element address=0 * 80040000+2 * 704+0=0 * 80040580H.Continuous 16 bytes from take out this address need 16 the picture element brightness values of second row that superpose exactly.
5) finish the stack of 16 picture elements.Particularly be exactly certain delegation's dot matrix of forming this dot character (refer to here taken out first, second byte), promptly each in 16 is carried out following operation: if this position is 1, then the brightness value Y with this corresponding picture element in the original image changes constant C into; If this position is 0, then keep in the original image brightness value of this corresponding picture element constant.
6) get 16 of next lines forming this dot character, and represent, take out 16 picture element brightness values of image next line correspondence, set by step 5 with the binary digit form) finish the stack of 16 picture elements.Repeat this process, can finish the stack of a dot character.
Finish the overlap-add procedure of a plurality of characters in the two field picture, the stack implementation procedure of a dot character that has illustrated above only needing to repeat.
What more than enumerate only is 2 specific embodiment of the present invention, mainly is the brightness processed to image, to realize the character stack of different brightness.Obviously, the invention is not restricted to above examples of implementation, many other execution modes can also be arranged.Such as, realize the color character stack: color character superpose needed character library and monochromatic superpose identical.Realize color character stack, except that needs to picture element brightness value (Y component) byte manipulation, also need simultaneously picture element chromatic value (UV component) byte to be operated, to the operation of picture element chromatic value byte only need repeat in specific embodiment to brightness operation 3), 4), 5), 6) and step.
Processing for continuous videos stream: in described technical scheme, original video stream continuously stores in the dynamic memory through the A/D change-over circuit, therefore, as long as to each frame original digital image of storing continuously in the dynamic memory, adopt aforesaid character overlapping method overlaying character, can realize character stack the continuous videos image.
The dot character of support of the present invention comprises: the ASCII character of 8 * 16 dot matrix can show character, the Chinese character of 16 * 16 or 24 * 24 dot matrix etc.
Of the present invention on digital picture the general dsp chip in the overlaying character method be the PNX1500 family chip of Philips company, the A/D conversion chip is the SAA7113H or the SAA7144HL chip of Philips company, dynamic ram chip is meant but is not limited to following chip, for example the K4D263238F of SAMSUNG company.
Claims (4)
1. the method for an overlaying character on digital picture is characterized in that comprising the steps:
Suppose that dot character to be superimposed is made up of N * M dot matrix, wherein M is the row dot matrix, and N is the row dot matrix, and M, N are positive integers
The a certain storage area of dynamic memory is downloaded and stored into to the conventional characters dot character library file that 1) will generate in advance;
2) a frame of digital video image of the character to be superimposed that will import stores in the dynamic memory buffering area;
3) search dot character to be superimposed in dynamic memory library stores district, taking-up is formed the first row N position of this dot character and is represented by binary digit;
4) from dynamic storage buffer, take out the corresponding N that this two field picture is intended the overlaying character position
0Individual picture element brightness value, N
0=N;
5) finish N
0The stack of individual picture element:
If the brightness value of a certain picture element is Y, with 1 byte representation, the brightness value of character to be superimposed is a constant C, with 1 byte representation, a certain position in certain delegation N position of this dot character of composition that has taken out is 1, and then the brightness value Y with this corresponding picture element in the original image changes C into, if this position is 0, then keep in the original image brightness value of this corresponding picture element constant,, finish N according to this principle
0The stack of individual picture element;
6) get the next line N position of forming this dot character, and represent, take out the N of image next line correspondence with the binary digit form
0Individual picture element brightness value, set by step 5) finish N
0The stack of individual picture element; Repeat this process up to capable the disposing of all M of forming this dot character, can finish the stack of a dot character.
2. according to claim 1 on digital picture the method for overlaying character, it is characterized in that a point in the dot character, be meant bit, its value is 0 or 1, each binary digit when overlap-add operation, a picture element on the corresponding one by one digital picture.
3. according to claim 1 on digital picture the method for overlaying character, it is characterized in that step 2) digital video image be meant through the original digital image after the A/D conversion chip analog-to-digital conversion.
4. according to claim 1 on digital picture the method for overlaying character, it is characterized in that said dot character comprises: the ASCII character of 8 * 16 dot matrix can show the Chinese character of character and 16 * 16 or 24 * 24 dot matrix.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101996390A (en) * | 2010-10-20 | 2011-03-30 | 中兴通讯股份有限公司 | Image copying method and device |
| CN102038500A (en) * | 2010-12-02 | 2011-05-04 | 广东宝莱特医用科技股份有限公司 | Method for outputting file and overlapping waveforms of electrocardiograph |
| CN101599263B (en) * | 2009-07-17 | 2012-09-05 | 青岛海信移动通信技术股份有限公司 | Mobile terminal and display method of screen display (OSD) interface thereof |
| CN102902534A (en) * | 2012-09-18 | 2013-01-30 | 山东神戎电子股份有限公司 | Transparent OSD (Optical Scanning Device) software realization method |
| CN104394332A (en) * | 2014-11-25 | 2015-03-04 | 冯为心 | Word stock establishing method applied to SDI (Serial Digital Interface) HD video character superimposition and word stock device |
| CN108154544A (en) * | 2017-12-19 | 2018-06-12 | 苏州华兴源创电子科技有限公司 | A kind of method and apparatus of overlaying character on the image |
| CN112492239A (en) * | 2019-09-12 | 2021-03-12 | 北京嗨动视觉科技有限公司 | Character superposition display method, device and system and computer readable storage medium |
| CN114938433A (en) * | 2022-07-25 | 2022-08-23 | 四川赛狄信息技术股份公司 | Video image processing method, system, terminal and medium based on FPGA |
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- 2005-07-08 CN CN 200510050635 patent/CN1710946A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101599263B (en) * | 2009-07-17 | 2012-09-05 | 青岛海信移动通信技术股份有限公司 | Mobile terminal and display method of screen display (OSD) interface thereof |
| CN101996390A (en) * | 2010-10-20 | 2011-03-30 | 中兴通讯股份有限公司 | Image copying method and device |
| CN101996390B (en) * | 2010-10-20 | 2013-11-06 | 中兴通讯股份有限公司 | Image copying method and device |
| CN102038500A (en) * | 2010-12-02 | 2011-05-04 | 广东宝莱特医用科技股份有限公司 | Method for outputting file and overlapping waveforms of electrocardiograph |
| CN102038500B (en) * | 2010-12-02 | 2013-03-06 | 广东宝莱特医用科技股份有限公司 | Method for outputting file and overlapping waveforms of electrocardiograph |
| CN102902534A (en) * | 2012-09-18 | 2013-01-30 | 山东神戎电子股份有限公司 | Transparent OSD (Optical Scanning Device) software realization method |
| CN102902534B (en) * | 2012-09-18 | 2015-08-12 | 山东神戎电子股份有限公司 | A kind of transparent OSD software implementation method |
| CN104394332A (en) * | 2014-11-25 | 2015-03-04 | 冯为心 | Word stock establishing method applied to SDI (Serial Digital Interface) HD video character superimposition and word stock device |
| CN108154544A (en) * | 2017-12-19 | 2018-06-12 | 苏州华兴源创电子科技有限公司 | A kind of method and apparatus of overlaying character on the image |
| CN112492239A (en) * | 2019-09-12 | 2021-03-12 | 北京嗨动视觉科技有限公司 | Character superposition display method, device and system and computer readable storage medium |
| CN114938433A (en) * | 2022-07-25 | 2022-08-23 | 四川赛狄信息技术股份公司 | Video image processing method, system, terminal and medium based on FPGA |
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