CN104935885A

CN104935885A - AXI bus based extensible multi-channel image acquisition device

Info

Publication number: CN104935885A
Application number: CN201510304030.6A
Authority: CN
Inventors: 刘娟秀; 付大鹏; 任程辉; 杨广辉; 陈奋; 吴宗森; 易少宾; 张静; 刘霖; 刘永; 叶玉堂
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2015-06-04
Filing date: 2015-06-04
Publication date: 2015-09-23
Anticipated expiration: 2035-06-04
Also published as: CN104935885B

Abstract

The invention discloses an AXI bus based extensible multi-channel image acquisition device, relates to an image acquisition device, and particularly relates to the technical field of Zynq based multi-channel image acquisition. According to the invention, a ping-pong operation is carried out on acquired image data, the image data is respectively stored into two RAMs (random access memories), then a splicing module reads the data from the RAMs, carries out splicing and then stores the spliced data into FIFO, a data stream is generated at last and then transmitted to an image processing module so as to complete processing for images. The AXI bus based extensible multi-channel image acquisition device has the advantages of ability of carrying out efficient data acquisition in a multi-channel mode simultaneously and high processing speed.

Description

A kind of easily extensible multiplex image acquisition device based on AXI bus

Technical field

The invention belongs to a kind of image collecting device, particularly based on the multiplex image acquisition technical field of Zynq.

Technical background

In wire rod, tubing visual defects detection system, single camera cannot complete the apparent panoramic picture collection to wire rod, tubing, and by multiple camera, multi-angled shooting, can realize the apparent panoramic picture collection to wire rod, tubing.Conventional images harvester is when arranging multiple camera, and need to each camera configuration image pick-up card, such cost is very high, and needs extra computational resource in follow-up image procossing, significantly increases the time of calculating.

This method can according to information such as the diameter of the wire rod of required detection, tubing and accuracy of detection requirements, and dynamic-configuration connects camera number and camera mode of operation, convenient and practical.Zynq chip is SOC technical products of new generation, develops based on IP reuse technology, carries out IP interconnected by AXI bus.AXI stream is the one in AXI bus, is mainly used in data stream transmitting, and speed is fast, and agreement is simple.

Summary of the invention

Technical problem to be solved by this invention is that design is a kind of fast based on AXI bus processing speed, structure simple easily extensible multiplex image acquisition device.

A kind of easily extensible multiplex image acquisition device based on AXI bus of the present invention, this device comprises: multiple IMAQ branch road, concatenation module, fifo module, data flow generation module, image processing module, driver module, ARM; Wherein IMAQ branch road comprises: camera, camera link chip, data capture module, RAM1, RAM2, collected by camera image information is transferred to data capture module by cameralink chip, the data received are carried out ping-pong operation and are stored in turn to RAM1 or RAM2 by data capture module, concatenation module reads data and splices from RAM1 and RAM2, then writes FIFO; Data flow generation module is reads image data from each IMAQ branch road FIFO, comprehensively generates data flow, is then transferred to image processing module; ARM controls driver module and sends driving data to other each module.

Wherein ARM is configured driver module by AXI lite bus; Data flow generation module passes through AXI stream bus by data stream transmitting to image processing module.

A kind of easily extensible multiplex image acquisition device based on AXI bus of the present invention, by carrying out ping-pong operation to the view data collected respectively stored in two RAM, then therefrom respectively place to go splice, stored in FIFO, finally generate data stream transmitting to image processing module, complete the process of image, thus have can the image data of simultaneously Multi-channel high-efficient, the advantage that processing speed is fast.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of easily extensible multiplex image acquisition device based on AXI bus of the present invention.

Embodiment

1. this device total system framework as shown in Figure 1.

2.ARM is configured camera number and mode of operation, is configured by the corresponding registers of AXI lite bus to camera driver module.Resolve configuration-direct, configuration information is given view data trapping module and AXI stream data flow generation module.The camera number of corresponding module according to practical application and the mode of operation of camera, definition relevant variable, carries out work.

3.ARM produces camera drive singal, be configured by the corresponding registers of AXI lite bus to camera driver module, by resolving ARM configuration-direct, Zynq logical resource is utilized to produce camera driver' s timing, drive singal is sent to camera link chip, the LVTTL signal that Zynq sends here by camera link chip changes LVDS signal into, and LVDS signal delivers to camera by camera link cable, drives camera work.

4. after camera obtains activation bit, start working, the view data of collection is delivered to camera link chip by camera link cable with LVDS signal mode, and the LVDS signal that camera is sent here by camera link chip changes LVTTL signal into, then gives Zynq chip internal.

5. view data trapping module produces image data acquiring sequential by internal logic resource, gathers camera image data.

6. view data trapping module first produces corresponding time sequence by logic, first each camera clock signal rising edge is caught respectively, phase relation according to camera link view data and clock carries out phase adjusted, reliable and stable to guarantee the view data collected.According to the signals such as FVAL, LVAL, DVAL of camera link and the rising edge clock signal of catching, write ram in slice is carried out buffer memory by the effective view data of each camera respectively.The view data of each camera adopts two RAM to carry out buffer memory, by ping-pong operation, just changes the buffer memory that another RAM carries out next line view data after each buffer memory a line view data.

7. concatenation module, reads a line view data in the current RAM not carrying out write operation respectively, in write FIFO, completes the splicing of view data, buffer memory.

8.AXI stream data flow generation module, after monitoring and having data in buffer memory FIFO, the view data of having spliced is read, data flow is generated according to AXI stream bus standard, data flow length equals camera single row of pixels number and is multiplied by camera number, and gives treatment system by view data with data-stream form and carry out image procossing.

Claims

1. based on an easily extensible multiplex image acquisition device for AXI bus, this device comprises: multiple IMAQ branch road, concatenation module, fifo module, data flow generation module, image processing module, driver module, ARM; Wherein IMAQ branch road comprises: camera, camera link chip, data capture module, RAM1, RAM2, collected by camera image information is transferred to data capture module by camera link chip, the data received are carried out ping-pong operation and are stored in turn to RAM1 or RAM2 by data capture module, concatenation module reads data and splices from RAM1 and RAM2, then writes FIFO; Data flow generation module is reads image data from each IMAQ branch road FIFO, comprehensively generates data flow, is then transferred to image processing module; ARM controls driver module and sends driving data to other each module.

2. a kind of easily extensible multiplex image acquisition device based on AXI bus as claimed in claim 1, is characterized in that described ARM is configured driver module by AXI lite bus; Data flow generation module passes through AXI stream bus by data stream transmitting to image processing module.