CN104581095A

CN104581095A - Camera Link video optical transceiver

Info

Publication number: CN104581095A
Application number: CN201410829168.3A
Authority: CN
Inventors: 陈浩; 卢磊; 袁鑫
Original assignee: China Aerospace Times Electronics Corp
Current assignee: China Aerospace Times Electronics Corp; Beijing Aerospace Control Instrument Institute
Priority date: 2014-12-26
Filing date: 2014-12-26
Publication date: 2015-04-29

Abstract

A Camera Link video optical transceiver comprises an optical transceiver transmitting terminal, an optical fiber slip ring and an optical transceiver receiving terminal. A Camera Link digital camera is taken as a video source, and an optical module is taken as a core component to realize electro-optical conversion and optical-electric conversion of video signals; long-distance, lossless and transparent transmission of a video from the Camera Link digital camera can be realized only through one piece of optical fiber; the Camera Link video optical transceiver with a Bayer filtering function combines optical-electric conversion and Bayer filtering functions at the optical transceiver receiving terminal, a Bayer color image subjected to optical-electric conversion is unstrung and then subjected to caching, the Bayer filtering operation function is realized in a hardware manner, a transmitted Bayer image is converted into a 24-bit RGB true color image, direct observation by human eyes and follow-up image processing are better facilitated, and the Camera Link video optical transceiver has great application value in the field of video surveillance, detection and the like.

Description

A kind of Camera Link video optical multiplexer

Technical field

The present invention relates to a kind of Camera Link video optical multiplexer, be applicable to the high-quality of color digital video signal, long-distance transmissions, and can according to user's request, expansive approach, in the field such as video monitoring, video tracking, is applied to industrial machine vision-based detection, aviation unmanned plane reconnaissance pod etc.

Background technology

In color digital video signal high-quality, long-distance transmissions process, Camera Link digital camera only needs 5 pairs of differential serial data lines just can obtain effective picture signal, row useful signal, frame useful signal and clock signal and be widely used by as video source.When Camera Link digital camera export be RGB true color image time, the color depth of its each pixel is at least 8bit, therefore each pixel at least needs 24bit, and the data volume of such optical transmitter and receiver transmission can increase greatly, causes pressure to the capacity of optical module.

For RGB true color image data volume this problem large, selected Bayer color camera to replace RGB true color camera afterwards when optical transmitter and receiver carries out transmission of video, Bayer color camera increases RGB three-colour filter on sensor pixels surface according to Bayer mosaic rule, each pixel only exports a kind of color in R, G, B, as shown in Figure 1.Therefore relative to RGB true color image, the each pixel of Bayer coloured image only needs 8bit, greatly reduces the data volume of transmitting image, but also to bring image resolution ratio low for this, the adjacent picture elements degree of association is poor, is unfavorable for that human eye is directly observed and the shortcomings such as successive image process.In order to address this problem, often all need to carry out Bayer filtering operation by VC++ programming on host computer to reduce to coloured image, both add cost like this, also inconveniently give other vision circuit plate by the RGB true color image after reduction and process.

Summary of the invention

The technical problem that the present invention solves is: overcome the deficiencies in the prior art, provide a kind of CameraLink video optical multiplexer, the Bayer coloured image after optical transport is directly converted to 24 RGB true color images by optical transmitter and receiver receiving terminal.

Technical solution of the present invention is: a kind of Camera Link video optical multiplexer, comprises optical transmitter and receiver transmitting terminal, optical fiber slip ring and optical transmitter and receiver receiving terminal, and optical transmitter and receiver transmitting terminal and optical transmitter and receiver receiving terminal are linked together by optical fiber slip ring; Optical transmitter and receiver transmitting terminal comprises Camera Link protocol-decoding module, FPGA module, clock module, serial module and optical module; 5 pairs of differential serial data signals from Camera Link digital camera are converted to parallel viewdata signal, row useful signal, frame useful signal and pixel clock signal by Camera Link protocol-decoding module; Efficient parallel viewdata signal extracts and is sent to serial module by FPGA module; Clock module produces the clock signal be sent to required for serial module; Serial module delivers to optical module after parallel effective image data are converted to 1 pair of differential serial data; Optical transmitter and receiver receiving terminal is transferred to by optical fiber slip ring after 1 pair of differential serial signal of telecommunication that serial module is sent here by optical module is converted to light signal; Optical transmitter and receiver receiving terminal comprises optical module, module of unstringing, FPGA module, clock module, memory module, Camera Link agreement recover module; Optical module delivers to module of unstringing after the light signal sent here by optical fiber slip ring is reduced to 1 pair of differential serial signal of telecommunication; 1 pair of differential serial signal of telecommunication is reduced to parallel effective image data by module of unstringing; FPGA module stores parallel effective image data, after read operation, Bayer filtering operation, deliver to Camera Link agreement in the lump recover module together with the row useful signal corresponding with 24 RGB true color images generated, frame useful signal, pixel clock signal; Signal source of clock required when clock module generation FPGA generation row useful signal, frame useful signal, pixel clock signal; Camera Link agreement is recovered module and parallel viewdata signal, row useful signal, frame useful signal, pixel clock signal is reverted to the 5 pairs of differential serial data signals meeting Camera Link agreement.

The model that described Camera Link protocol-decoding module is selected is DS90CR286.

Described FPGA module selects model to be EP3C25F256.

Described optical module selects model to be FTCT-1312-10I.

Described serial module selects model to be TLK2711.

The present invention's advantage is compared with prior art: Camera Link video optical multiplexer adopts optical fiber slip ring as transmission medium, the harmless transparent transmission of vision signal can be realized on the basis of camera being carried out to any rotation process, Camera Link video optical multiplexer adds Bayer filtering operation function at receiving terminal simultaneously, make Bayer coloured image can be directly used in human eye observation, the processing capacities such as video monitoring and follow-up image trace after the transmission of Camera Link video optical multiplexer.

Accompanying drawing explanation

Fig. 1 is of the present invention used Bayer coloured image schematic diagram;

Fig. 2 is schematic diagram of the present invention;

Fig. 3 is transmitting terminal composition frame chart of the present invention;

Fig. 4 is receiving terminal composition frame chart of the present invention;

Fig. 5 is transmitting terminal schematic diagram of the present invention;

Fig. 6 is receiving terminal schematic diagram of the present invention.

Embodiment

As described in Figure 2, a kind of Camera Link of the present invention video optical multiplexer, comprise optical transmitter and receiver transmitting terminal, optical fiber slip ring and optical transmitter and receiver receiving terminal, optical transmitter and receiver transmitting terminal and optical transmitter and receiver receiving terminal are linked together by optical fiber slip ring; As shown in Figure 3, transmitting terminal of the present invention comprises Camera Link protocol-decoding module, FPGA module, clock module, serial module and optical module; 5 pairs of differential serial data signals from Camera Link digital camera are converted to parallel viewdata signal, row useful signal, frame useful signal and pixel clock signal by Camera Link protocol-decoding module; Efficient parallel viewdata signal extracts and is sent to serial module by FPGA module; Clock module produces the clock signal be sent to required for serial module; Serial module delivers to optical module after parallel effective image data are converted to 1 pair of differential serial data; Optical transmitter and receiver receiving terminal is transferred to by optical fiber slip ring after 1 pair of differential serial signal of telecommunication that serial module is sent here by optical module is converted to light signal; As shown in Figure 4, receiving terminal of the present invention comprise optical module, module of unstringing, FPGA module, clock module, memory module, Camera Link agreement recover module; Optical module delivers to module of unstringing after the light signal sent here by optical fiber slip ring is reduced to 1 pair of differential serial signal of telecommunication; 1 pair of differential serial signal of telecommunication is reduced to parallel effective image data by module of unstringing; FPGA module stores parallel effective image data, after read operation, Bayer filtering operation, deliver to Camera Link agreement in the lump recover module together with the row useful signal corresponding with 24 RGB true color images generated, frame useful signal, pixel clock signal; Signal source of clock required when clock module generation FPGA generation row useful signal, frame useful signal, pixel clock signal; Camera Link agreement is recovered module and parallel viewdata signal, row useful signal, frame useful signal, pixel clock signal is reverted to the 5 pairs of differential serial data signals meeting Camera Link agreement

As shown in Figure 5, for transmitting terminal schematic diagram of the present invention, 5 pairs of differential serial signals from Camera Link digital camera are converted to parallel 8bit picture signal, row useful signal, frame useful signal and pixel clock signal by Camera Link protocol-decoding module DS90CR286, when frame useful signal is low level, the row counting of FPGA module EP3C25F256 to each two field picture resets, when frame useful signal is high level, FPGA adopts row useful signal to count row, thus extracts effective row of each two field picture.Same, in the effective row extracted, when row useful signal is low level, the column count of FPGA to every a line image resets, when row useful signal is high level, FPGA adopts pixel clock signal to count row, thus effective view data can be extracted, then utilize 80MHz clock signal from crystal oscillator module as the tranmitting data register signal of serial module TLK2711, extracted effective image data are sent to the serial-port of TLK2711, view data is converted to 1 pair of differential serial signals and exports by it, then the electrical-optical ALT-CH alternate channel of optical module FTCT-1312-10I converts this to light signal output to differential serial signals.As shown in Figure 6, for receiving terminal schematic diagram of the present invention, use the light-electric ALT-CH alternate channel of FTCT-1312-10I optical module that the light signal of Bayer coloured image is reverted to 1 pair of differential serial signal of telecommunication, then the receive clock signal that this is reverted to parallel viewdata signal to signal differential serial signal and corresponds by the passage that unstrings of TLK2711 is adopted, then the IP kernel of sdram controller is called therein with FPGA module EP3C25F256, according to the receive clock signal obtained after unstringing be in the SDRAM of MT48LC4M32B2 to model by view data buffer memory, open up 2 pieces of FIFO spaces at FPGA inner utilization FIFO IP kernel simultaneously, every block FIFO space comprises 3 FIFO, the data volume that the size of each FIFO is often gone by Bayer coloured image is determined, the data volume of often going as Bayer coloured image is 1024 pixels, then the space size of each FIFO should be 1024*8bit, then from SDRAM, read adjacent 3 row view data is successively stored in each FIFO in one piece of FIFO space, the 3 row Bayer coloured images stored then are carried out interpolation arithmetic by another block makes each pixel transitions be 24 RGB forms, then 80MHz clock signal frequency division is 60MHz pixel clock at intrinsic call ALTPLL IP kernel by FPGA, then row useful signal and frame useful signal is generated by this pixel clock counting according to the line number of each two field picture and columns counting, be sent to Camera Link agreement and recovered module DS90CR285, again be converted into the 5 pairs of differential serial data lines meeting Camera Link agreement to export.

The content be not described in detail in specification of the present invention belongs to the known technology of those skilled in the art.

Claims

1. a Camera Link video optical multiplexer, is characterized in that: comprise optical transmitter and receiver transmitting terminal, optical fiber slip ring and optical transmitter and receiver receiving terminal, and optical transmitter and receiver transmitting terminal and optical transmitter and receiver receiving terminal are linked together by optical fiber slip ring; Optical transmitter and receiver transmitting terminal comprises Camera Link protocol-decoding module, FPGA module, clock module, serial module and optical module; 5 pairs of differential serial data signals from Camera Link digital camera are converted to parallel viewdata signal, row useful signal, frame useful signal and pixel clock signal by Camera Link protocol-decoding module; Efficient parallel viewdata signal extracts and is sent to serial module by FPGA module; Clock module produces the clock signal be sent to required for serial module; Serial module delivers to optical module after parallel effective image data are converted to 1 pair of differential serial data; Optical transmitter and receiver receiving terminal is transferred to by optical fiber slip ring after 1 pair of differential serial signal of telecommunication that serial module is sent here by optical module is converted to light signal; Optical transmitter and receiver receiving terminal comprises optical module, module of unstringing, FPGA module, clock module, memory module, Camera Link agreement recover module; Optical module delivers to module of unstringing after the light signal sent here by optical fiber slip ring is reduced to 1 pair of differential serial signal of telecommunication; 1 pair of differential serial signal of telecommunication is reduced to parallel effective image data by module of unstringing; FPGA module stores parallel effective image data, after read operation, Bayer filtering operation, deliver to Camera Link agreement in the lump recover module together with the row useful signal corresponding with 24 RGB true color images generated, frame useful signal, pixel clock signal; Signal source of clock required when clock module generation FPGA generation row useful signal, frame useful signal, pixel clock signal; Camera Link agreement is recovered module and parallel viewdata signal, row useful signal, frame useful signal, pixel clock signal is reverted to the 5 pairs of differential serial data signals meeting Camera Link agreement.

2. a kind of Camera Link video optical multiplexer according to claim 1, is characterized in that: the model that described Camera Link protocol-decoding module is selected is DS90CR286.

3. a kind of Camera Link video optical multiplexer according to claim 1, is characterized in that: described FPGA module selects model to be EP3C25F256.

4. a kind of Camera Link video optical multiplexer according to claim 1, is characterized in that: described optical module selects model to be FTCT-1312-10I.

5. a kind of Camera Link video optical multiplexer according to claim 1, is characterized in that: described serial module selects model to be TLK2711.