Design Of Linear CCD Camera Based On FPGA

With the rapid development of machine vision technology,on industrial production lines more and more products were detected by machine vision.Industrial cameras as front-end image acquisition parts of machine vision systems,Determines the quality of imaging and the speed of transmission,Therefore,the development of high-speed,high-resolution industrial cameras has a significant application foundation and practical significance.CCD image sensor is widely used in industrial cameras because of its high imaging quality and low noise.Due to its rich logic resources,reconfigurable,and high-speed parallelism,FPGAs have unique advantages in the visual and imaging fields.In this paper,a line-array CCD image sensor and FPGA are combined to develop a high-speed,high-resolution line-array camera for industrial inspection.Linear array CCD sensor captures the image,FPGA acts as the entire camera processing chip to control the entire camera function,Finally,under the condition of the relative motion of the measured object and the line camera,the collected image is uploaded to the host computer through the Gigabit Ethernet transmission protocol for further algorithm analysis.The application object of this linear array camera is used for the detection of cloth defects on the production line,and the model and parameters of the core device are selected according to the requirements and indexes of the fabric defect detection.This line-array camera uses high-resolution,high-frequency linear array CCDs to capture images with relative motion on the production line,Since the CCD output signal is an analog signal and contains a large amount of reset noise,a high-speed AD with a correlated double sampling function is used in this device design to perform analog-to-digital conversion on the image signal output by the CCD and remove the reset noise.Finally,taking into account the data transmission rate and distance,the collected images are transmitted to the host computer for further algorithm processing through the GigE Vision protocol.After completing the hardware circuit and some software drivers,the entire design was simulated and debugged,and the output waveform was stable to meet the design requirements.