CN104539886A - Infrared digital image acquisition and transmission system and method based on optical fiber communication - Google Patents
Infrared digital image acquisition and transmission system and method based on optical fiber communication Download PDFInfo
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- CN104539886A CN104539886A CN201410748321.XA CN201410748321A CN104539886A CN 104539886 A CN104539886 A CN 104539886A CN 201410748321 A CN201410748321 A CN 201410748321A CN 104539886 A CN104539886 A CN 104539886A
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Abstract
The invention discloses an infrared digital image acquisition and transmission system and method based on optical fiber communication. The system and method are used for performing remote acquisition, transmission and real-time display of digital images generated by an infrared imaging detection device. The method includes the steps that a sending end detects infrared digital images received from an LVDS interface and packs the infrared digital images; after a receiving end unpacks the infrared digital images, image data are cut according to an acquisition window, then, the data enter an FPGA, a high-capacity FIFO cache area composed of an FIFO cache and an outside SDRAM is built in the FPGA, and the data enter an upper computer through a USB interface and are displayed in real time. The system and method have the advantages that due to the fact that the image acquisition window is adopted and the high-capacity FIFO cache area composed of the FIFO cache and the outside SDRAM is built in the FPGA, transmission of useless image data is reduced, data transmission efficiency is improved, meanwhile, only one SDRAM is used as a cache, and a circuit structure is simplified.
Description
Technical field:
The present invention relates to transmission and the display of infrared digital image, specifically a kind of infrared digital image collection based on optical fiber communication and transmission system and method.It is mainly used in infrared imaging detection equipment and produces remote collection, the transmission of digital picture and show in real time.
Background technology:
Infrared imaging detector can convert infrared radiation to the signal of telecommunication, and then the signal of telecommunication is infrared digital image by analog-to-digital conversion after preliminary treatment.Usual infrared imaging detector needs the real-time detection ability in omnidirectional spatial domain, therefore Infrared Detectors needs the rotation of 360 degree, and data acquisition, receiving system are fixed body, therefore need in real time the data high-speed that rotary body produces to be transferred on fixed body highly reliably.And the brush of original adoption and the implementation of conducting ring, very large signal noise can be introduced, be not suitable for the data-signal of transmitting high speed.
Data acquisition system caching design many employings ping-pong buffer in the past, this needs two panels SDRAM, and this adds collection, the volume of transmission system equipment and complexity virtually.Simultaneously data acquisition system many employings pci bus is in the past connected with main frame.But it does not support hot plug, be also unfavorable for making portable set, application popularization degree is so extensive far away from USB interface.
Therefore, design a kind of two-forty, high reliability, portable infrared digital image collection system, transmission very necessary.Adopt data between Optical Fiber Transmission rotary body and fixed body can avoid introducing signal noise, simulate a high-capacity FIFO with a slice SDRAM simultaneously and be connected by USB interface can simplify circuit structure with main frame.
Summary of the invention:
The object of the invention is to propose a kind of infrared digital image collection based on optical fiber communication and transmission system and method, realize the high speed of infrared digital image, high reliability transport, process and display, achieve in Practical Project and not only require that circuit structure is simple, require again the target of transmission data at a high speed, reliably.
For achieving the above object, hardware platform of the present invention mainly comprises: main frame, optical fiber receiving terminal and optical fiber transmitting terminal.
Each hardware components demand fulfillment: described main frame is the computer with USB2.0 interface.Described optical fiber receiving terminal comprises a slice FPGA, a slice USB2.0 controller chip, a slice SDRAM, an optic fiber transceiver module and peripheral circuit; Wherein, described FPGA has block memory module; Described USB2.0 controller chip has the USB2.0 interface of a connection main frame, the IO pin that can arrange input and output direction from device fifo interface and two of a connection external equipment; Described SDRAM has 8M bytes store capacity and 8 bit data bus; Described optic fiber transceiver module is the optical receiving circuit module of an optical fiber connector and a slice serioparallel exchange chip composition; USB2.0 controller chip, SDRAM are directly connected with FPGA with optic fiber transceiver module is equal.Described optical fiber transmitting terminal comprises a slice FPGA, an optical fiber sending module and peripheral circuit interface; Wherein, described FPGA has block memory module; Described optical fiber sending module is the optical fiber transtation mission circuit module of an optical fiber connector and a slice parallel-serial conversion chip composition; Described peripheral circuit interface is LVDS interface; Optical fiber sending module is all directly connected with FPGA with peripheral circuit interface;
The annexation of each hardware composition is: main frame is connected by USB2.0 transmission cable with optical fiber receiving terminal; Optical fiber receiving terminal and optical fiber transmitting terminal pass through Fiber connection; Optical fiber transmitting terminal is connected by LVDS interface with Infrared Detectors.
The flow process that the present invention specifically implements is as follows:
Step 1: optical fiber transmitting terminal FPGA configures optical fiber sending module clock, and stored in built-in FIFO buffer memory after the view data detected is packed;
Step 2: optical fiber transmitting terminal FPGA is read data and sent by optical fiber sending module from built-in FIFO buffer memory;
Step 3: optical fiber receiving terminal FPGA configures optic fiber transceiver module clock, receives fiber data and detects its image frame head;
Step 4: according to acquisition window order, by after the view data cutting that receives stored in built-in input FIFO buffer memory;
Step 5:SDRAM control unit determines the read-write operation to SDRAM according to priority algorithm rotation mechanism, constantly data in built-in input FIFO buffer memory are read successively and are written in SDRAM, or data in SDRAM read successively and is written in built-in output FIFO buffer memory, making SDRAM and the built-in FIFO of input buffer memory and export FIFO buffer memory to be combined into a high-capacity FIFO;
Step 6: view data sending module read data in built-in output FIFO buffer memory and be written to USB2.0 controller chip from device FIFO;
Step 7: be configured to from device FIFO, controls transfer pattern by USB2.0 control chip by Design of Firmware, sets up a DMA transmission channel and the control command that main frame sends can be issued optical fiber receiving terminal FPGA by I/O port Simulation with I IC protocol mode simultaneously;
Step 8: main frame reads the data from device FIFO of USB2.0 controller chip by USB2.0 interface, and send the control commands such as acquisition window by USB2.0 interface;
Step 9: the IIC in optical fiber receiving terminal FPGA, from device interface module, according to IIC agreement, receives the control command that USB2.0 controller chip sends, and by it stored in command register.
Priority algorithm rotation mechanism concrete steps described are in steps of 5 as follows:
(5-1): initialization is write SDRAM has high priority;
(5-2): check and read or write SDRAM whether to complete, complete and forward to (5-3);
(5-3): have more than 127 bytes if SDRAM has more than 127 byte capacities and inputs in FIFO buffer memory, then forward to (5-4), otherwise forward to (5-6);
(5-4): there is high priority or export FIFO and be cached with if write SDRAM and be less than 128 byte capacities, then forward to (5-5), otherwise forward to (5-6);
(5-5): carry out write operation to SDRAM, complete the rearmounted SDRAM of reading there is high priority and forward to (5-2);
(5-6): be cached with more than 127 byte capacities if SDRAM has more than 127 bytes and exports FIFO, then forward to (5-7), otherwise forward to (5-2);
(5-7): if read SDRAM to there is high priority or input FIFO is cached with and is less than 128 bytes, then forward to (5-8), otherwise forward to (5-2);
(5-8): carry out read operation to SDRAM, complete the rearmounted SDRAM of writing there is high priority and forward to (5-2).
Distinguishing feature of the present invention is as follows:
(1) compact, portability is strong.Whole optical fiber receiving terminal concentrates on together on board, owing to only employing a slice SDRAM and using USB interface with computer link, significantly reduces the volume and weight of system.
(2) owing to employing the mode of IMAQ window, when image generation speed exceedes the transmission rate of acquisition system, by setting acquisition window, only transmit significant view data, improve the transmission rate of acquisition system.
(3) scheme of Module Division is adopted, according to data flow, optical fiber transmission board design partition is become image-receptive, cache module and image sending module etc., optical fiber dash receiver design partition is become preamble detecting, image and high-capacity FIFO etc. in acquisition window, orderliness is clear, is convenient to programming.
Accompanying drawing explanation
Fig. 1 is the system block diagram based on the infrared digital image collection of optical fiber communication, transmission system and method.
Fig. 2 is the flow chart based on the infrared digital image collection of optical fiber communication, transmission system and method.
Embodiment:
With reference to the accompanying drawings the specific embodiment of the present invention is further described below.
Fig. 1 is the system block diagram based on the infrared digital image collection of optical fiber communication, transmission system and method.
Hardware platform of the present invention is: a main frame, a slice USB2.0 control chip, two panels FPGA, a slice SDRAM, an optic fiber transceiver module, an optical fiber sending module and peripheral interface.
Described main frame has USB2.0 interface, and is provided with the driver of infrared digital image collection based on optical fiber communication, transmission system.
Described USB2.0 control chip has selected the CY7C68013 of Cypress company.This chip meets USB2.0 standard, its maximum operating frequency is 48MHz, it has can Simulation with I IC agreement more than two common input and output pins, it can be configured to from device FIFO, controls transfer pattern, make data can at a high speed, reliably pass to main frame by CY7C68013 and show, actual measurement maximum transmission rate is 23Mbyte/s.
Described fpga chip, optical fiber transmitting terminal and optical fiber receiving terminal have all selected the XC6SLX9-TQG144 of Xilinx Spartan-6 series, the FPGA of this model has abundant logical resource and Clock management resource, can be used for building internal buffer, to realize the buffer memory of data, and be combined into high-capacity FIFO with SDRAM.
Described SDRAM chip has selected the MT48LC8M8A2-75 of Micron company, the SDRAM total capacity of this model is 8M byte, read-write speed is up to 133Mbyte/s, bandwidth is shared when considering data input and output, the read-write speed of selecting after half has still exceeded the highest actual measurement speed of USB2.0, can provide buffer memory for high speed data transfer and can not reduce transmission rate.
Described optic fiber transceiver module comprises an optical fiber connector HFBR-5208AMZ and a slice serioparallel exchange chip MAX9218, optical fiber receiving terminal FPGA pass through inner preamble detecting module, and control MAX9218 receives fiber data.
Described optical fiber sending module comprises an optical fiber connector HFBR-5208AMZ and a slice parallel-serial conversion chip MAX9217, optical fiber transmitting terminal FPGA sends control module by inner optical fiber, control MAX9217 sends fiber data, optical fiber sends, the flank speed of receiver module is 70Mbyte/s, has exceeded the actual measurement speed of USB2.0.
Described LVDS interface direct connects 3 pairs of difference I/O pins of connecting fiber transmitting terminal FPGA as Differential Input.Select pin type DB9 socket as connector.
Fig. 2 is the flow chart based on the infrared digital image collection of optical fiber communication, transmission system and method.
After optical fiber sends, receiver module clock is configured, optical fiber transmitting terminal FPGA constantly detect from LVDS interface to view data, after view data being added frame head packing, by controlling optical fiber sending module, view data is sent from optical fiber.
The view data that the continuous detection fiber receiver module of optical fiber receiving terminal FPGA receives, and by acquisition window order cutting image that image sends according to main frame, simultaneously in order to ensure panoramic view, cutting is crossed fixed length in image stream and is inserted non-cutting image, and it inserts frequency and is controlled by acquisition window command parameter.Then view data is added that frame head is injected in the high-capacity FIFO that the built-in FIFO buffer memory of FPGA and SDRAM be combined into, this high-capacity FIFO is that the write of 16-bit data is mated with optic fiber transceiver module data/address bus figure place, and 8-bit data reading mates from device FIFO figure place with write USB2.0 control chip.View data sending module controls view data in high-capacity FIFO to write USB2.0 control chip continuously from device FIFO simultaneously.
SDRAM control unit in optical fiber receiving terminal FPGA, that is arbitrated by priority algorithm rotation mechanism is read or writes SDRAM operation control inputs FIFO buffer memory, exports FIFO buffer memory, the read-write operation of these three modules of SDRAM chip.Priority algorithm rotation mechanism has taken into full account that USB2.0 transmission rate can not affect by it fiber-optic transmission rate by optical fiber receiving terminal controls, and in order to give full play to the buffer memory effect of SDRAM, all the time SDRAM operator precedence will be write, namely first judge whether write SDRAM satisfies condition, thus ensure that in input FIFO buffer memory, data can not exceed its capacity.Such SDRAM control unit, input FIFO buffer memory, output FIFO buffer memory become a Large Copacity buffering area with these four block combiner of SDRAM chip, it reads and writes data and has first in first out (FIFO) feature and read-write sequence is the same with FPGA built-in FIFO read-write sequence, therefore the combination of these four modules can be operated as a high-capacity FIFO.
USB2.0 control chip is configured to from device FIFO, controls transfer pattern, and after DMA transmission channel is set up, FPGA can write view data to it continuously from device FIFO, and data from device FIFO can be read in main frame and show by main frame continuously simultaneously.
Acquisition window order is sent to USB2.0 control chip by main frame by the control end points of USB2.0 control chip, to be then stored in its command register module to optical fiber receiving terminal FPGA by IIC protocol transmission.Two common IO pins of USB2.0 control chip are connected with two IO pins of optical fiber receiving terminal FPGA, by IO pin simulation IIC agreement, USB2.0 control chip as the main equipment of IIC, optical fiber receiving terminal FPGA as IIC from equipment.
Claims (3)
1., based on infrared digital image collection and the transmission system of optical fiber communication, it comprises main frame, optical fiber receiving terminal and optical fiber transmitting terminal, it is characterized in that:
Described main frame is the computer with USB2.0 interface;
Described optical fiber receiving terminal comprises a slice FPGA, a slice USB2.0 controller chip, an optic fiber transceiver module, a slice SDRAM; Wherein: described FPGA has block memory module; Described USB2.0 controller chip has the USB2.0 interface of a connection main frame, the IO pin that can arrange input and output direction from device fifo interface and two of a connection external equipment; Described SDRAM has 8M bytes store capacity and 8 bit data bus; Described optic fiber transceiver module is the optical receiving circuit module of an optical fiber connector and a slice serioparallel exchange chip composition; USB2.0 controller chip, SDRAM are directly connected with FPGA with optic fiber transceiver module is equal;
Described optical fiber transmitting terminal comprises a slice FPGA, an optical fiber sending module and peripheral circuit interface; Wherein, described FPGA has block memory module; Described optical fiber sending module is the optical fiber transtation mission circuit module of an optical fiber connector and a slice parallel-serial conversion chip composition; Described peripheral circuit interface is LVDS interface; Optical fiber sending module is all directly connected with FPGA with peripheral circuit interface;
Main frame is connected by USB2.0 transmission cable with optical fiber receiving terminal; Optical fiber receiving terminal and optical fiber transmitting terminal pass through Fiber connection; Optical fiber transmitting terminal is connected by LVDS interface with Infrared Detectors.
2., based on the method based on the infrared digital image collection of optical fiber communication and the infrared digital image collection of transmission system and transmission according to claim 1, it is characterized in that comprising the following steps:
Step 1: optical fiber transmitting terminal FPGA configures optical fiber sending module clock, and stored in built-in FIFO buffer memory after the view data detected is packed;
Step 2: optical fiber transmitting terminal FPGA is read data and sent by optical fiber sending module from built-in FIFO buffer memory;
Step 3: optical fiber receiving terminal FPGA configures optic fiber transceiver module clock, receives fiber data and detects its image frame head;
Step 4: according to acquisition window order, by after the view data cutting that receives stored in built-in input FIFO buffer memory;
Step 5:SDRAM control unit determines the read-write operation to SDRAM according to priority algorithm rotation mechanism, constantly data in built-in input FIFO buffer memory are read successively and are written in SDRAM, or data in SDRAM read successively and is written in built-in output FIFO buffer memory, making SDRAM and the built-in FIFO of input buffer memory and export FIFO buffer memory to be combined into a high-capacity FIFO;
Step 6: view data sending module read data in built-in output FIFO buffer memory and be written to USB2.0 controller chip from device FIFO;
Step 7: be configured to from device FIFO, controls transfer pattern by USB2.0 control chip by Design of Firmware, sets up a DMA transmission channel and the control command that main frame sends can be issued optical fiber receiving terminal FPGA by I/O port Simulation with I IC protocol mode simultaneously;
Step 8: main frame reads the data from device FIFO of USB2.0 controller chip by USB2.0 interface, and send the control commands such as acquisition window by USB2.0 interface;
Step 9: the IIC in optical fiber receiving terminal FPGA, from device interface module, according to IIC agreement, receives the control command that USB2.0 controller chip sends, and by it stored in command register.
3. according to claim 2 a kind of based on the infrared digital image collection of the infrared digital image acquiring and transmission system based on optical fiber communication according to claim 1 and the method for transmission, it is characterized in that: priority algorithm rotation mechanism concrete steps described are in steps of 5 as follows:
(5-1): initialization is write SDRAM has high priority;
(5-2): check and read or write SDRAM whether to complete, complete and forward to (5-3);
(5-3): have more than 127 bytes if SDRAM has more than 127 byte capacities and inputs in FIFO buffer memory, then forward to (5-4), otherwise forward to (5-6);
(5-4): there is high priority or export FIFO and be cached with if write SDRAM and be less than 128 byte capacities, then forward to (5-5), otherwise forward to (5-6);
(5-5): carry out write operation to SDRAM, complete the rearmounted SDRAM of reading there is high priority and forward to (5-2);
(5-6): be cached with more than 127 byte capacities if SDRAM has more than 127 bytes and exports FIFO, then forward to (5-7), otherwise forward to (5-2);
(5-7): if read SDRAM to there is high priority or input FIFO is cached with and is less than 128 bytes, then forward to (5-8), otherwise forward to (5-2);
(5-8): carry out read operation to SDRAM, complete the rearmounted SDRAM of writing there is high priority and forward to (5-2).
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| CN109284243A (en) * | 2018-11-21 | 2019-01-29 | 深圳开立生物医疗科技股份有限公司 | FPGA communication control unit and method based on USB |
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| WO2023279656A1 (en) * | 2021-07-06 | 2023-01-12 | 浙江天铂云科光电股份有限公司 | Method for transmitting infrared data, temperature sensing data and other data |
| CN114785932A (en) * | 2022-04-29 | 2022-07-22 | 北京控制工程研究所 | Optical fiber-based virtual high-speed camera array data buffer logic design method |
| CN114785932B (en) * | 2022-04-29 | 2023-08-11 | 北京控制工程研究所 | Virtual high-speed camera array data buffer logic design method based on optical fibers |
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Application publication date: 20150422 |