CN101325712A - Portable terminal for real time acquiring and displaying image based on ARM - Google Patents
Portable terminal for real time acquiring and displaying image based on ARM Download PDFInfo
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- CN101325712A CN101325712A CN 200810048425 CN200810048425A CN101325712A CN 101325712 A CN101325712 A CN 101325712A CN 200810048425 CN200810048425 CN 200810048425 CN 200810048425 A CN200810048425 A CN 200810048425A CN 101325712 A CN101325712 A CN 101325712A
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Abstract
The invention relates to a portable image real-time collecting and displaying terminal based on ARM. Its technical proposal is as follows: CCD camera is connected through a USB interface with an ARM; a data terminal and an address terminal of the ARM are respectively connected with the data terminal and address terminal corresponding to an FLASH module, a SDRAM1 module and a SDRAM2 module; a video data terminal and a video control terminal of the ARM are connected with the data terminal and video control terminal corresponding to an LCD module; the ARM is connected through the USB interface module with an outer memory; the ARM is connected through an Ethernet module with a network apparatus. The invention adopts an embedded LINUX technology and compiles an image collecting program using corresponding programming interface function of LINUX kernel, uses the double-buffer memory technology of image data and the method of mapping the display buffer field of the LCD module to an user memory field so as to realize the real-time display of image in the LCD display module. The system has advantages of rapid processing response speed, small volume, and low power consumption etc.
Description
Technical field
The invention belongs to the built-in image collection technical field.Relating in particular to a kind of portable image based on ARM gathers and display terminal in real time.
Background technology
Development along with information technology, video technique is widely used in fields such as Industry Control, intelligent transportation, the common method of IMAQ and demonstration is to handle and show the video information at the ccd video camera scene of obtaining on PC, though this method is easy to realize, but cost is higher, volume is big, is inconvenient to carry.
At present the vision system overwhelming majority is made up of PC, image pick-up card, ccd video camera etc., and software design is based on the software architecture the window platform under, this cause the image capturing system volume greatly, be inconvenient to move.For example " based on the complex industrial production process intelligence control system of vision " (Zhang Yong, Dong Jiwen, Chen Yue brightness University Of Ji'nan's information science and engineering college's Control Engineering 2004.3) is made up of a PC, two colourful CCD video cameras and image pick-up card; " high speed video frequency collecting system " (CN1684024), adopt USB interface to realize image data transmission, though this image capturing system can be realized real-time collection at a high speed, but because its IMAQ and transmission procedure are based on Window operating system, this acquisition system volume is big, is inconvenient to move.
Summary of the invention
Task of the present invention provides the portable image based on ARM that a kind of volume is little, low in energy consumption, processing speed is fast and gathers in real time and display terminal.
In order to finish this task, the technical solution adopted in the present invention is: the CCD camera is connected with ARM by usb interface module, the data terminal of ARM is connected with the address end with FLASH module, SDRAM1 module and the corresponding data terminal of SDRAM2 module respectively with the address end, the video data end of ARM is connected with the video control end with the corresponding data terminal of LCD module with the video control end, ARM is connected with external memory by usb interface module, and ARM is connected with the network equipment by ethernet module.Software adopts the flush type LINUX technology, utilize the corresponding DLL (dynamic link library) function of LINUX kernel to write the IMAQ program, use the double buffering memory technology of view data and the display buffer of LCD module is mapped to the method in user memory district, realize the real-time demonstration of LCD display module image.
The address end A1[0:12 of described SDRAM1 module] with the address end A2[0:12 of SDRAM2 module] with the address end MA[2:14 of ARM] be connected, the address end BA1[0:1 of SDRAM1 module] with the address end BA2[0:1 of SDRAM2 module] with the address end MA[24:25 of ARM] be connected, the data terminal DQ1[0:15 of SDRAM1 module] and the data terminal DQ2[0:15 of SDRAM2 module] with the corresponding data terminal MD[0:15 of ARM], MD[16:31] connect, the read-write control end LDQM1 of SDRAM1 module, the corresponding read-write control end of UDQM1 and ARM WBE0, WBE1 connects, the read-write control end LDQM2 of SDRAM2 module, the corresponding read-write control end of UDQM2 and ARM WBE2, WBE3 connects, the control end CKE1 of SDRAM1 module, CLK1, nRAS1, nCAS1, the control end CKE2 of nWE1 and SDRAM2 module, CLK2, nRAS2, nCAS2, nWE2 respectively with the corresponding control end SCKE of ARM, SCLK0, nSRAS, nSCAS, nWE connects, and the sheet choosing end nCS2 of the sheet choosing end nCS1 of SDRAM1 module and SDRAM2 module is connected with the sheet choosing end nGCS6 of ARM.
The address end A[1:24 of described FLASH module], data terminal DQ[0:15] with the corresponding address of ARM end MA[1:24], data terminal MD[0:15] be connected, the reset terminal nRP of FLASH module is connected with the reset terminal nRESET of ARM, the Enable Pin nOE that reads of FLASH module is connected with the Enable Pin nOE that reads of ARM, the Enable Pin nWE that writes of FLASH module is connected with the Enable Pin nWE that writes of ARM, and the sheet choosing end nCE0 of FLASH module is connected with the sheet choosing end nGCS0 of ARM.
The data terminal R[4:0 of described LCD module], G[5:0], B[4:0] with the corresponding video data end of ARM VD[23:19], VD[15:10], VD[7:3] be connected, the frame synchronizing signal end VSYNC of LCD module is connected with the frame synchronizing signal end VFRAME of ARM, the row of LCD module holds HSYNC to hold VINE to be connected synchronously with the row of ARM synchronously, the clock signal terminal CLK of LCD module is connected with the clock signal terminal VCLK of ARM, and the control end DENB of LCD module is connected with the control end VM of ARM.
The data terminal SD[0:15 of described ethernet module] with the data terminal MD[0:15 of ARM] be connected, the address end CMD of ethernet module is connected with the address end MA2 of ARM, the middle broken ends of fractured bone INT of ethernet module is connected with the middle broken ends of fractured bone EINT0 of ARM, the Enable Pin IOR that reads of ethernet module is connected with the Enable Pin nOE that reads of ARM, the Enable Pin IOW that writes of ethernet module is connected with the Enable Pin nWE that writes of ARM, and the sheet choosing end AEN of ethernet module is connected with the sheet choosing end nGCS1 of ARM; The data terminal TX of ethernet module
+, TX
-, RX
+, RX
-Be connected with the corresponding port of the network equipment.
The data terminal D1 of described usb interface module
+, D1
-Be connected the data terminal D2 of usb interface module with the corresponding data terminal DN0 of ARM, DP0
+, D2
-Be connected with the corresponding data terminal DN1 of ARM, DP1; The data terminal D1 of usb interface module
+, D1
-Be connected the data terminal D2 of usb interface module with the CCD camera
+, D2
-Be connected with external memory.
The present invention has used the Video4Linux application programming interfaces on software, Video4Linux is that the kernel of video equipment among the Linux drives, for the application programming of video equipment provides a series of interface functions.Therefore, should select Video for Linux option under the Multimedia Devices at the configuration phase of linux kernel.
Concrete IMAQ and display routine flow process are:
1) uses ioct1 (grab_fd, VIDIOCGMBUF ， ﹠amp; Grab_vm) function obtains the frame information of camera memory buffer, revises the setting among the voideo_mmap, for example resets the vertical and horizontal resolution of picture frame, colored display format.
2) this device adopts the double buffering method when IMAQ, and promptly when buffer0 storage data, the data among the buffer1 are used for showing; When buffer1 storage data, the data among the buffer0 are used for showing.
Its false code is as follows:
VIDIOCMCAPTURE (0) // begin to gather first frame;
while(1){
The N time second frame of VIDIOCMCAPTURE (1) // begin to gather;
VIDIOCSYNC (0) // the N time first whether frame is finished, and does not finish wait;
// when gathering the N time second frame, begin to show N first frame;
VIDIOCMCAPTURE (0) // again begins to gather the N+1 time first frame;
Second frame that VIDIOCSYNC (1) // wait is gathered for the N time;
// when the N+1 time is gathered first frame, show second frame of the N time collection;
}
3) image data format is selected the form of RGB565 for use, because LCD module display screen is 16, need video data stream to be converted into 16 digital video data flow with 24, promptly preceding 5 of the red part in 24 bit data streams, preceding 6 of green portion, back 5 of blue portion show first row earlier as a point that shows, show that again second row is up to having shown 320 row in the time of demonstration.
In order to improve the display speed of image, this device adopts the mmap EMS memory mappings method, after ordinary file is mapped to the process address space, process can equally conduct interviews to file to the visit common memory, needn't call read again, operations such as write with the address space that framebuffer (video memory) is mapped to oneself, accelerate the display speed of view data by mmap greatly.The mmap function of using in the program is:
vd-＞map＝(unsigned?char*)mmap(0，vd-＞mbuf.size，PROT_READ|PROT_WRITE，MAP_SHARED，vd-＞fd，0))＜0)
Owing to adopt technique scheme, the present invention is by the view data at CCD camera collection scene, utilize the powerful characteristic of data processing of ARM, adopt the built-in Linux designing technique, utilize the corresponding DLL (dynamic link library) function of LINUX kernel to write the IMAQ program, double buffering memory technology by view data and LCD display module display buffer is mapped to the method for the memory field of user's space realizes the real-time demonstration of LCD display module image.Reduced the volume of image capturing system, had that volume is little, reliability is high, can be in abominable characteristics such as on-the-spot reliably working.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the circuit diagram of SDRAM1 module and SDRAM2 module among Fig. 1;
Fig. 3 is the circuit diagram of FLASH module among Fig. 1;
Fig. 4 is the circuit diagram of LCD module among Fig. 1;
Fig. 5 is the circuit diagram of ethernet module among Fig. 1;
Fig. 6 is the circuit diagram of usb interface module among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, this embodiment is further described:
A kind of portable image based on ARM is gathered and display terminal in real time, its structure as shown in Figure 1, the CCD camera is connected with ARM by usb interface module, the data terminal of ARM is connected with the address end with FLASH module, SDRAM1 module and the corresponding data terminal of SDRAM2 module respectively with the address end, the video data end of ARM is connected with the video control end with the corresponding data terminal of LCD module with the video control end, ARM is connected with external memory by usb interface module, and ARM is connected with the network equipment by ethernet module.Software adopts the flush type LINUX technology, utilize the corresponding DLL (dynamic link library) function of LINUX kernel to write the IMAQ program, use the double buffering memory technology of view data and the display buffer of LCD module is mapped to the method in user memory district, realize the real-time demonstration of LCD display module image.
The circuit diagram of SDRAM1 module and SDRAM2 module as shown in Figure 2, the address end A1[0:12 of SDRAM1] with the address end A2[0:12 of SDRAM2 module] with the address end MA[2:14 of ARM] be connected, the address end BA1[0:1 of SDRAM1 module] with the address end BA2[0:1 of SDRAM2 module] with the address end MA[24:25 of ARM] be connected, the data terminal DQ1[0:15 of SDRAM1 module] and the data terminal DQ2[0:15 of SDRAM2 module] with the corresponding data terminal MD[0:15 of ARM], MD[16:31] connect, the read-write control end LDQM1 of SDRAM1 module, the corresponding read-write control end of UDQM1 and ARM WBE0, WBE1 connects, the read-write control end LDQM2 of SDRAM2 module, the corresponding read-write control end of UDQM2 and ARM WBE2, WBE3 connects, the control end CKE1 of SDRAM1 module, CLK1, nRAS1, nCAS1, the control end CKE2 of nWE1 and SDRAM2 module, CLK2, nRAS2, nCAS2, nWE2 respectively with the corresponding control end SCKE of ARM, SCLK0, nSRAS, nSCAS, nWE connects, and the sheet choosing end nCS2 of the sheet choosing end nCS1 of SDRAM1 module and SDRAM2 module is connected with the sheet choosing end nGCS6 of ARM.Wherein, SDRAM1 module and SDRAM2 module are made of two SDRAM chip K452632C chips.
Fig. 3 is the circuit diagram of FLASH module: the FLASH module is made of a slice FLASH chip 28F128J3A chip.The address end A[1:24 of FLASH module], data terminal DQ[0:15] with the corresponding address of ARM end MA[1:24], data terminal MD[0:15] be connected, the reset terminal nRP of FLASH module is connected with the reset terminal nRESET of ARM, the Enable Pin nOE that reads of FLASH module is connected with the Enable Pin nOE that reads of ARM, the Enable Pin nWE that writes of FLASH module is connected with the Enable Pin nWE that writes of ARM, and the sheet choosing end nCE0 of FLASH module is connected with the sheet choosing end nGCS0 of ARM.
Fig. 4 is the circuit diagram of LCD module: the data terminal R[4:0 of LCD module], G[5:0], B[4:0] with the corresponding video data end of ARM VD[23:19], VD[15:10], VD[7:3] be connected, the frame synchronizing signal end VSYNC of LCD module is connected with the frame synchronizing signal end VFRAME of ARM, the row of LCD module holds HSYNC to hold VINE to be connected synchronously with the row of ARM synchronously, the clock signal terminal CLK of LCD module is connected with the clock signal terminal VCLK of ARM, and the control end DENB of LCD module is connected with the control end VM of ARM.
Fig. 5 is the circuit diagram of ethernet module: the data terminal SD[0:15 of ethernet module] with the data terminal MD[0:15 of ARM] be connected, the address end CMD of ethernet module is connected with the address end MA2 of ARM, the middle broken ends of fractured bone INT of ethernet module is connected with the middle broken ends of fractured bone EINT0 of ARM, the Enable Pin IOR that reads of ethernet module is connected with the Enable Pin nOE that reads of ARM, the Enable Pin IOW that writes of ethernet module is connected with the Enable Pin nWE that writes of ARM, and the sheet choosing end AEN of ethernet module is connected with the sheet choosing end nGCS1 of ARM; The data terminal TX of ethernet module
+, TX
-, RX
+, RX
-Be connected with the corresponding port of the network equipment.Ethernet module is made up of Ethernet chip DM9000, network transformer and RJ45 interface.
Fig. 6 is the circuit diagram of usb interface module: the data terminal D1 of usb interface module
+, D1
-Be connected the data terminal D2 of usb interface module with the corresponding data terminal DN0 of ARM, DP0
+, D2
-Be connected with the corresponding data terminal DN1 of ARM, DP1; The data terminal D1 of usb interface module
+, D1
-Be connected the data terminal D2 of usb interface module with the CCD camera
+, D2
-Be connected with external memory.
This embodiment has been used the Video4Linux application programming interfaces on software, Video4Linux is that the kernel of video equipment among the Linux drives, for the application programming of video equipment provides a series of interface functions.Therefore, should select Video for Linux option under the Multimedia Devices at the configuration phase of linux kernel.
Concrete IMAQ and display routine flow process are:
1) uses ioct1 (grab_fd, VIDIOCGMBUF ， ﹠amp; Grab_vm) function obtains the frame information of camera memory buffer, revises the setting among the voideo_mmap, for example resets the vertical and horizontal resolution of picture frame, colored display format.
2) this device adopts the double buffering method when IMAQ, and promptly when buffer0 storage data, the data among the buffer1 are used for showing; When buffer1 storage data, the data among the buffer0 are used for showing.
Its false code is as follows:
VIDIOCMCAPTURE (0) // begin to gather first frame;
while(1){
The N time second frame of VIDIOCMCAPTURE (1) // begin to gather;
VIDIOCSYNC (0) // the N time first whether frame is finished, and does not finish wait;
// when gathering the N time second frame, begin to show N first frame;
VIDIOCMCAPTURE (0) // again begins to gather the N+1 time first frame;
Second frame that VIDIOCSYNC (1) // wait is gathered for the N time;
// when the N+1 time is gathered first frame, show second frame of the N time collection;
}
3) image data format is selected the form of RGB565 for use, because LCD module display screen is 16, need video data stream to be converted into 16 digital video data flow with 24, promptly preceding 5 of the red part in 24 bit data streams, preceding 6 of green portion, back 5 of blue portion show first row earlier as a point that shows, show that again second row is up to having shown 320 row in the time of demonstration.
In order to improve the display speed of image, this device adopts the mmap EMS memory mappings method, after ordinary file is mapped to the process address space, process can equally conduct interviews to file to the visit common memory, needn't call read again, operations such as write with the address space that framebuffer (video memory) is mapped to oneself, accelerate the display speed of view data by mmap greatly.The mmap function of using in the program is:
vd-＞map＝(unsigned?char*)mmap(0，vd-＞mbuf.size，PROT_READ|PROT_WRITE，MAP_SHARED，vd-＞fd，0))＜0)
This embodiment is by the view data at CCD camera collection scene, utilize the powerful characteristic of data processing of ARM, adopt the built-in Linux designing technique, utilize the corresponding DLL (dynamic link library) function of LINUX kernel to write the IMAQ program, double buffering memory technology by view data and LCD display module display buffer is mapped to the method for the memory field of user's space realizes the real-time demonstration of LCD display module image.Reduced the volume of image capturing system, had that volume is little, reliability is high, can be in abominable characteristics such as on-the-spot reliably working.
Claims (6)
1, a kind of portable image based on ARM is gathered and display terminal in real time, it is characterized in that the CCD camera is connected with ARM by usb interface module, the data terminal of ARM is connected with the address end with FLASH module, SDRAM1 module and the corresponding data terminal of SDRAM2 module respectively with the address end, the video data end of ARM is connected with the video control end with the corresponding data terminal of LCD module with the video control end, ARM is connected with external memory by usb interface module, and ARM is connected with the network equipment by ethernet module; Software adopts the flush type LINUX technology, utilize the corresponding DLL (dynamic link library) function of LINUX kernel to write the IMAQ program, use the double buffering memory technology of view data and the display buffer of LCD module is mapped to the method in user memory district, realize the real-time demonstration of LCD display module image.
2, portable image based on ARM according to claim 1 is gathered and display terminal in real time, the address end A1[0:12 that it is characterized in that described SDRAM1 module] with the address end A2[0:12 of SDRAM2 module] with the address end MA[2:14 of ARM] be connected, the address end BA1[0:1 of SDRAM1 module] with the address end BA2[0:1 of SDRAM2 module] with the address end MA[24:25 of ARM] be connected, the data terminal DQ1[0:15 of SDRAM1 module] and the data terminal DQ2[0:15 of SDRAM2 module] with the corresponding data terminal MD[0:15 of ARM], MD[16:31] connect, the read-write control end LDQM1 of SDRAM1 module, the corresponding read-write control end of UDQM1 and ARM WBE0, WBE1 connects, the read-write control end LDQM2 of SDRAM2 module, the corresponding read-write control end of UDQM2 and ARM WBE2, WBE3 connects, the control end CKE1 of SDRAM1 module, CLK1, nRAS1, nCAS1, the control end CKE2 of nWE1 and SDRAM2 module, CLK2, nRAS2, nCAS2, nWE2 respectively with the corresponding control end SCKE of ARM, SCLK0, nSRAS, nSCAS, nWE connects, and the sheet choosing end nCS2 of the sheet choosing end nCS1 of SDRAM1 module and SDRAM2 module is connected with the sheet choosing end nGCS6 of ARM.
3, the portable image based on ARM according to claim 1 is gathered and display terminal in real time, the address end A[1:24 that it is characterized in that described FLASH module], data terminal DQ[0:15] with the corresponding address of ARM end MA[1:24], data terminal MD[0:15] be connected, the reset terminal nRP of FLASH module is connected with the reset terminal nRESET of ARM, the Enable Pin nOE that reads of FLASH module is connected with the Enable Pin nOE that reads of ARM, the Enable Pin nWE that writes of FLASH module is connected with the Enable Pin nWE that writes of ARM, and the sheet choosing end nCE0 of FLASH module is connected with the sheet choosing end nGCS0 of ARM.
4, portable image based on ARM according to claim 1 is gathered and display terminal in real time, the data terminal R[4:0 that it is characterized in that described LCD module], G[5:0], B[4:0] and the corresponding video data end of ARM VD[23:19], VD[15:10], VD[7:3] connect, the frame synchronizing signal end VSYNC of LCD module is connected with the frame synchronizing signal end VFRAME of ARM, the row of LCD module holds HSYNC to hold VINE to be connected synchronously with the row of ARM synchronously, the clock signal terminal CLK of LCD module is connected with the clock signal terminal VCLK of ARM, and the control end DENB of LCD module is connected with the control end VM of ARM.
5, portable image based on ARM according to claim 1 is gathered and display terminal in real time, the data terminal SD[0:15 that it is characterized in that described ethernet module] with the data terminal MD[0:15 of ARM] be connected, the address end CMD of ethernet module is connected with the address end MA2 of ARM, the middle broken ends of fractured bone INT of ethernet module is connected with the middle broken ends of fractured bone EINT0 of ARM, the Enable Pin IOR that reads of ethernet module is connected with the Enable Pin nOE that reads of ARM, the Enable Pin IOW that writes of ethernet module is connected with the Enable Pin nWE that writes of ARM, and the sheet choosing end AEN of ethernet module is connected with the sheet choosing end nGCS1 of ARM; The data terminal TX of ethernet module
+, TX
-, RX
+, RX
-Be connected with the corresponding port of the network equipment.
6, the portable image based on ARM according to claim 1 is gathered and display terminal in real time, it is characterized in that the data terminal D1 of described usb interface module
+, D1
-Be connected the data terminal D2 of usb interface module with the corresponding data terminal DN0 of ARM, DP0
+, D2
-Be connected with the corresponding data terminal DN1 of ARM, DP1; The data terminal D1 of usb interface module
+, D1
-Be connected the data terminal D2 of usb interface module with the CCD camera
+, D2
-Be connected with external memory.
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|---|---|---|---|
| CN 200810048425 CN101325712A (en) | 2008-07-17 | 2008-07-17 | Portable terminal for real time acquiring and displaying image based on ARM |
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|---|---|---|---|
| CN 200810048425 CN101325712A (en) | 2008-07-17 | 2008-07-17 | Portable terminal for real time acquiring and displaying image based on ARM |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519960A (en) * | 2011-11-30 | 2012-06-27 | 广东电网公司电力科学研究院 | Embedded portable collection and display system and method for metallographic structure |
| CN102636275A (en) * | 2012-05-14 | 2012-08-15 | 长春大学 | Auxiliary interpretation and analysis system of mercury thermometer |
| CN102905065A (en) * | 2012-11-02 | 2013-01-30 | 邱虹云 | Programmable dedicated science-grade digital single-lens camera with general processor architecture |
| CN106355861A (en) * | 2016-09-29 | 2017-01-25 | 武汉胜鹏智造科技有限公司 | ARM (Advanced RISC Machine)-based multi-protocol multi-mode general smart data collection system |
| CN108206913A (en) * | 2017-07-17 | 2018-06-26 | 北京市商汤科技开发有限公司 | A kind of image-pickup method, device, embedded system and storage medium |
-
2008
- 2008-07-17 CN CN 200810048425 patent/CN101325712A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519960A (en) * | 2011-11-30 | 2012-06-27 | 广东电网公司电力科学研究院 | Embedded portable collection and display system and method for metallographic structure |
| CN102519960B (en) * | 2011-11-30 | 2013-09-04 | 广东电网公司电力科学研究院 | Embedded portable collection and display system and method for metallographic structure |
| CN102636275A (en) * | 2012-05-14 | 2012-08-15 | 长春大学 | Auxiliary interpretation and analysis system of mercury thermometer |
| CN102905065A (en) * | 2012-11-02 | 2013-01-30 | 邱虹云 | Programmable dedicated science-grade digital single-lens camera with general processor architecture |
| CN106355861A (en) * | 2016-09-29 | 2017-01-25 | 武汉胜鹏智造科技有限公司 | ARM (Advanced RISC Machine)-based multi-protocol multi-mode general smart data collection system |
| CN108206913A (en) * | 2017-07-17 | 2018-06-26 | 北京市商汤科技开发有限公司 | A kind of image-pickup method, device, embedded system and storage medium |
| CN108206913B (en) * | 2017-07-17 | 2021-03-09 | 北京市商汤科技开发有限公司 | Image acquisition method, image acquisition device, embedded system and storage medium |
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Open date: 20081217 |