Design Of High Frame Imaging System Based On LUX13HS Sensor

In the fields of national defense and aerospace,in order to observe the high-speed transient change process of the projectile and spacecraft,it is necessary to use the highspeed camera to capture high-speed process.With the development of science and technology,the speed of various research objects has been greatly improved,which puts forward higher requirements for the resolution,shooting frame rate and imaging quality of high-speed cameras.Currently,few high-speed cameras with real-time transmission could process image,and the image resolution and frame rate need to be further improved.Therefore,this paper uses LUX13 HS sensor produced by LUXIMA Company to propose a design of high frame rate imaging system that can preprocess and transmit images in real time.According to the output characteristics of LUX13 HS sensor,two working modes of the camera are designed.In half-frame mode,the maximum resolution is 640×864,and the imaging frame rate is 3513 fps.The resolution of the full-frame mode is 1280× 864,and the imaging frame rate can reach 2054 fps.After comparing the characteristics of several current mainstream data transmission interfaces,a high frame rate imaging system is designed,which uses Camera Link interface as the test and control interface.Coa XPress interface is used for real-time transmission of image data.In this paper,the high frame rate imaging system is divided into hardware design and software design.Firstly,the hardware designs of CMOS imaging,system control and interface transmission are implemented.Secondly,the software design mainly realizes the CMOS sensor control,DAC control,image data receiving and decoding,image data preprocessing,image caching and image transmission by writing FPGA program.Eventually,the functional simulations of each module are carried out.In this design,a histogram equalization algorithm based on shift operation is introduced into the high frame rate imaging system.Compared with the conventional methods,the algorithm can ensure the accuracy of operation and reduce the delay time and the occupation of FPGA logic resources.On this basis,an automatic exposure algorithm based on histogram analysis is realized.Through the functional test of the high frame rate imaging system,the feasibility of the design is verified.After histogram equalization,the contrast of image is enhanced,and the automatic exposure enables the high-speed camera to adjust the exposure time in real time according to the ambient brightness conditions.When shooting high-speed moving objects,the captured images are clear without trailing,which meets the design requirements of high frame rate imaging system.