CN104486578B - A kind of marine radar echo transmission method based on color index - Google Patents
A kind of marine radar echo transmission method based on color index Download PDFInfo
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- CN104486578B CN104486578B CN201410630171.2A CN201410630171A CN104486578B CN 104486578 B CN104486578 B CN 104486578B CN 201410630171 A CN201410630171 A CN 201410630171A CN 104486578 B CN104486578 B CN 104486578B
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Abstract
The present invention relates to a kind of marine radar echo transmission method based on color index, the blanking time of echo brightness and echo twilight sunset is determined, set up echo color index table；16 RGB datas of echo each pixel are converted into 8 bit image index datas；Data processing unit transmits to display terminal two 8 adjacent bit image index datas together；Display terminal receives image index data, and image index data is divided into height by double byte data width two groups of single byte of data and is exchanged with each other, and its true 16 RGB color value is inquired about in color index table；RGB color value after conversion is combined as into echo display image to be stored in display caching, display processing is carried out；Repeat step two to five, until terminating echo acquirement.The data transmission channel bandwidth that half is only taken up compared with original transmission means of the invention, improves efficiency of transmission 100% so that the radar return image data of high speed acquisition can be shown with the continuous and stable display terminal that is transferred to.
Description
Technical field
Returned the present invention relates to radar return image transmission technique field, especially a kind of marine radar based on color index
Ripple image transfer method.
Background technology
Marine navigation radar is the indispensable infrastructure device of modern ships, can be used for determining this ship position and pre- anticollision
Accident.Meanwhile, marine navigation radar can also accurately capture the thing mark information of other ships or land on the water surface.The common people
It is very high to cost control requirement with marine radar, therefore typically realize that its echo shows and target acquisition using embedded computer
Operation, however, the display size of marine radar display is increasing, display resolution also more and more higher, this results in echo
Data are greatly increased with the quantity of image.Therefore, how the problem of significantly more efficient utilization view data transmission channel bandwidth shows
Obtain particularly important.
Conventional ship radar image is typically transmitted using the image/video host-host protocol of standard, the picture number transmitted
Collection is transmitted according to by FIFO buffer storage or direct memory access controller, storage is delayed in the internal memory of display terminal
Rush in area, finally, shown over the display by IMAQ and processing unit.This image transmitting mode is in application process
In, have two it is particularly problematic：First, when radar image is shown using high Resolution and Large Size, image transmitting passage cannot
Meet view data transmission demand, additionally, radar antenna is when high speed rotates, the realtime image data of generation is excessive, image
Radar return image in transmission channel cannot be transferred on IMAQ and processing unit in time, can cause radar echo map
The loss of picture；Second, echo typically only three kinds of dominant hues of radar, such as black is background colour, and yellow is scan line
Color, the different green of brightness represents the varying strength of target echo, it is seen that directly express three without up to 16 bit data widths
Tone is planted, original 16 color image data great " waste " bandwidth of image transmitting passage is directly transmitted.
The content of the invention
Can at utmost reduce the demand of image transmitting bandwidth, be prevented effectively from thunder it is an object of the invention to provide a kind of
Up to the marine radar echo transmission method based on color index that echo is lost.
To achieve the above object, present invention employs following technical scheme：A kind of marine radar based on color index is returned
Ripple image transfer method, the method include following order the step of：
（1）Determine the blanking time of echo brightness and echo twilight sunset, set up echo color index table；
（2）16 RGB datas of echo each pixel are converted into 8 bit image index datas；
（3）Data processing unit by two 8 adjacent bit image index datas according to image video signal host-host protocol when
Sequence requirement is transmitted to display terminal together；
（4）Display terminal receives image index data according to the sequential of image video signal host-host protocol, by what is received
Image index data is divided into two groups of single byte of data of height and is exchanged with each other by double byte data width, in color index table
Inquire about its true 16 RGB color value；
（5）RGB color value after conversion is combined as echo display image and is stored in display caching by display terminal, is shown
Show treatment；
（6）According to the frequency of radar scanning, repeat step（2）To step（5）, display terminal persistently exports radar scanning and regards
Frequency image is until terminate echo acquirement.
First, echo brightness Y is determined according to echo rgb value, the computing formula of echo brightness Y is as follows：
Y = 0.299*R + 0.587*G + 0.114*B
Blanking time t according to echo twilight sunset determines the stepping length s and maximum magnitude r of index value, and stepping length s is returning
Ripple twilight sunset blanking time t calculate formula be：
Maximum magnitude r is with the formula that stepping length s is calculated：
It is determined that the domain color C of display echos, set up 8 basic bit index value CiTo 16 color value CtCorrespondence it is interval；8
Bit index value Ci16 corresponding color value CtComputing formula be：
F in above three formula is luminance weights.
Display terminal receives image index data according to image video signal host-host protocol, and the data for receiving are according to double byte
In internal memory, double byte is 16 for storage；Index data in internal memory carries out the exchange of height single byte according to double byte size,
Single byte is 8；With all of index data in the width of single byte traversal internal memory, while control color inquiry table is by index value
Be converted to true 16 RGB color values.
Described image video signal transmission agreement is to be transmitted according to the video format of ITU601 forms.
It is determined that the domain color C of display echosIt is three kinds：Black, yellow and green.
As shown from the above technical solution, the characteristics of present invention is using radar return color dullness, sets up color index to very
The mapping relations of color, color index value i.e. image index data is converted in transmitting terminal by true color according to color index table,
Radar return display image is transmitted using color index value, color index value is converted to very according to color index table in receiving terminal
Color and output shown to display memory.The data transmission channel that half is only taken up compared with original transmission means of the invention
Bandwidth, improves efficiency of transmission 100% so that the radar return image data of high speed acquisition can with it is continuous and stable be transferred to it is aobvious
Show that terminal is shown, farthest reduce the demand of image transmitting bandwidth, efficiently avoid radar return image
Lose.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Specific embodiment
A kind of marine radar echo transmission method based on color index, the method include following order the step of：
（1）Determine the blanking time of echo brightness and echo twilight sunset, set up echo color index table；（2）By echo each
16 RGB datas of pixel are converted to 8 bit image index datas；（3）Data processing unit is by two 8 adjacent bit image index numbers
Transmitted together to display terminal according to the timing requirements according to image video signal host-host protocol；（4）Display terminal is regarded according to image
The sequential of frequency signal transfer protocol receives image index data, and the image index data that will be received is by double byte data width point
It is segmented into two groups of single byte of data of height and is exchanged with each other, its true 16 RGB color value is inquired about in color index table；（5）Display
RGB color value after conversion is combined as echo display image and is stored in display caching by terminal, carries out display processing；（6）According to
The frequency of radar scanning, repeat step（2）To step（5）, display terminal persistently exports radar scanning video image until end
Echo acquirement.Described image video signal transmission agreement is to be transmitted according to the video format of ITU601 forms.Such as Fig. 1 institutes
Show.
By taking table 1 as an example, color index tableau format, content are as shown in table 1：
First, echo brightness Y is determined according to echo rgb value, the computing formula of echo brightness Y is as follows：
Y = 0.299*R + 0.587*G + 0.114*B
Blanking time t according to echo twilight sunset determines the stepping length s and maximum magnitude r of index value, and stepping length s is returning
Ripple twilight sunset blanking time t calculate formula be：
Maximum magnitude r is with the formula that stepping length s is calculated：
It is determined that the domain color C of display echos, it is determined that the domain color C of display echosIt is three kinds：Black, yellow and green.
Set up 8 basic bit index value CiTo 16 color value CtCorrespondence it is interval；8 bit index value Ci16 corresponding color values
CtComputing formula be：
F in above three formula is luminance weights.
Display terminal receives image index data according to image video signal host-host protocol, and the data for receiving are according to double byte
In internal memory, double byte is 16 for storage；Index data in internal memory carries out the exchange of height single byte according to double byte size,
Single byte is 8；With all of index data in the width of single byte traversal internal memory, while control color inquiry table is by index value
Be converted to true 16 RGB color values.S3C6410 registers are set and allow that radar return image processing unit gathers video figure
As 8 data.In other words, radar return image processing unit receives image index number according to image video signal host-host protocol
According to, the data that will not receive are changed correspondingly according to 16 rgb formats, but according to double byte（16）Storage
In internal memory；Index data in internal memory is carried out into height single byte according to double byte size（8）Exchange, due to using big
End transmission, the low byte high of double byte can be swapped in transmitting procedure, and the byte that will be exchanged is needed during decoding
Exchange is gone back, and the decoding of 8 to 16 is carried out according to the normal sequence of display；With all of in the width traversal internal memory of single byte
Index data, while index value is converted to true 16 RGB color values by the color look-up table for compareing generation.
Embodiment one
Index value is converted to by color true value as receiving terminal using S3C6410 processors in the present embodiment.S3C6410
Used as a computing unit, it is also possible to realize that reverse index calculating is processed with other processors or hardware.Radar is believed
Number processing unit sends 30 frame radar return images each second, and single frames radar image resolution ratio is 640 × 640 × 8bits
=400KB, therefore radar return image data rate is 12MB/s；
Blanking time t=2 seconds of echo twilight sunset, sets up the stepping length s and maximum magnitude r of index value；
Echo domain color black is the bit value of background colour rgb format 16 for 0x0000, yellow are scanning line color rgb format
16 bit values are 0xFFE0, green is echo color of object, according to the persistence requirement of 2 seconds, set the numerical value model of rgb format 16
It is 0x0020~0x07D0 to enclose；
It is s=1 to calculate stepping length according to the echo blanking time；
Maximum magnitude is with the result of stepping length computation as r=256；
8 bit index value CiScope be 0~255, by rgb format conversion after, 16 corresponding color value CtIt is Ct
={0x0000, 0x0020, 0x0040, ..., 0x07D0, 0xFFE0}。
In sum, the characteristics of present invention is using radar return color dullness, sets up color index to the mapping of true color
Relation, color index value i.e. image index data is converted in transmitting terminal by true color according to color index table, uses color rope
Draw value transmission radar return display image, color index value is converted into true color according to color index table in receiving terminal and is exported
Shown to display memory.The data transmission channel bandwidth that half is only taken up compared with original transmission means of the invention, improves
Efficiency of transmission 100% so that the radar return image data of high speed acquisition can be carried out with the continuous and stable display terminal that is transferred to
Display.
Claims (3)
1. a kind of marine radar echo transmission method based on color index, it is characterised in that the method includes following order
The step of：
（1）Determine the blanking time of echo brightness and echo twilight sunset, set up echo color index table；
（2）16 RGB datas of echo each pixel are converted into 8 bit image index datas；
（3）Data processing unit will according to the sequential of image video signal host-host protocol by two 8 adjacent bit image index datas
Ask and transmit together to display terminal；
（4）Display terminal receives image index data, the image that will be received according to the sequential of image video signal host-host protocol
Index data is divided into two groups of single byte of data of height and is exchanged with each other by double byte data width, is inquired about in color index table
Its true 16 RGB color value；
（5）RGB color value after conversion is combined as echo display image and is stored in display caching by display terminal, is carried out at display
Reason；
（6）According to the frequency of radar scanning, repeat step（2）To step（5）, display terminal persistently exports radar scanning video figure
As until terminating echo acquirement；
The step（1）Specifically refer to：
First, echo brightness Y is determined according to echo rgb value, the computing formula of echo brightness Y is as follows：
Y = 0.299*R + 0.587*G + 0.114*B
Blanking time t according to echo twilight sunset determines the stepping length s and maximum magnitude r of index value, and stepping length s is with more than echo
Brightness blanking time t calculate formula be：
Maximum magnitude r is with the formula that stepping length s is calculated：
It is determined that the domain color C of display echos, it is determined that the domain color C of display echosIt is three kinds：Black, yellow and green；Set up
8 basic bit index value CiTo 16 color value CtCorrespondence it is interval；8 bit index value Ci16 corresponding color value Ct's
Computing formula is：
F in above three formula is luminance weights.
2. the marine radar echo transmission method based on color index according to claim 1, it is characterised in that：It is aobvious
Show that terminal receives image index data according to image video signal host-host protocol, the data for receiving are stored in internal memory according to double byte
In, double byte is 16；Index data in internal memory carries out the exchange of height single byte according to double byte size, and single byte is 8
Position；With all of index data in the width traversal internal memory of single byte, while control color inquiry table is converted to very index value
16 RGB color values.
3. the marine radar echo transmission method based on color index according to claim 1 and 2, its feature exists
In：Described image video signal transmission agreement is to be transmitted according to the video format of ITU601 forms.
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| CN106056530B (en) * | 2016-06-01 | 2019-12-06 | 腾讯科技（深圳）有限公司 | Method and device for displaying picture content in application |
| CN110687536B (en) * | 2019-11-04 | 2023-10-27 | 武汉华讯国蓉科技有限公司 | Ship radar video data storage and drawing method |
| CN111551930B (en) * | 2020-05-18 | 2022-03-18 | 南京众博达电子科技有限公司 | Radar image display method based on layered display |
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