In modern life, it is necessary to image certain targets under low-light conditions such as dark night or morning dusk, and low-light night vision technology is one of the main technologies to expand the night visual perception of the human eye, and low-light remote sensing camera can greatly expand the effective working time range of various spacecraft, so that it can observe, report and warn ground emergencies in a wider period of time. The FPGA-driven scientific-grade CMOS image sensor realizes the imaging function of the low-light camera, and realizes the real-time digital TDI function and automatic exposure algorithm on the FPGA. The results of the exterior imaging experiment show that the contours of buildings, street lamps, trees and wires near the light source can be distinguished under the condition of low-light illumination, and the imaging effect of the low-light camera reaches the index.
Aiming at the problem that the background of deep space is complex and changeable, and the exposure time of CMOS image sensor is limited, the image is overexposed or too dark, an automatic gain adjustment algorithm of CMOS sensor based on image features is proposed. Starting from the characteristics of the sensor itself, the algorithm automatically adjusts the digital gain of the CMOS sensor to adapt to the change of the incident light intensity according to the difference of the captured images, improves the dynamic range of the image, and makes up for the limited exposure time range. Through experiments on specific imaging systems, the algorithm compares the imaging effects before and after using the algorithm, and it is concluded that the algorithm is versatile and easy to implement and can achieve good imaging results in scenes with drastic changes in illumination.
Aiming at the increasing demand of space dim and weak target detection camera and meeting the demand of small size and light weight, this paper proposes the design and implementation of a light and small low light level camera based on FPGA. The camera adopts IMX253, a high resolution and high response CMOS image sensor produced by SONY. FPGA is used to receive the data output by the sensor, cached in DDR3, and then transmitted to the data transmission system through TLK2711 interface. This paper introduces the camera system scheme, hardware design and camera driver with FPGA as the control core. Verilog hardware language is used to realize IMX253 timing drive, image acquisition, DDR3 data cache and TLK2711 interface communication. The imaging experiment of the system is carried out. The results show that the camera system runs stably, has high imaging quality and strong detection ability. The camera image resolution is 2048*2048, quantization bit is 12bit, frame rate can reach 20Hz. This system provides effective image data for space weak target detection.
KEYWORDS: Digital signal processing, Field programmable gate arrays, Computer programming, Inspection, Reliability, Switches, Signal processing, Switching, Space operations, Reconstruction algorithms
The FPGA+DSP architecture has been widely used in spaceborne digital signal systems. In order to adapt to the complex space environment, reduce the impact of single-event flipping, and meet the on-orbit requirements of intelligence and high reliability, a spaceborne dual-core system is proposed. On-track betting method. Taking Fudan Micro JFM7 series JFM7K325T and TI's TMS320C6678 as examples, the hardware circuit design and software design of FPGA+DSP program on-rail injection are introduced in detail. The ground experiment verification proves that the on-rail injection method is reasonable and feasible, and improves the reliability of the system that can complete the remote fault repair and function expansion of the onboard software.
KEYWORDS: Cameras, Sensors, Field programmable gate arrays, Video, Imaging systems, Data processing, Clocks, Data conversion, Human-machine interfaces, Data acquisition
To obtain the high-resolution and real-time digital image of the monitoring target and meet the requirements of miniaturization, a light and high-resolution video camera system based on FPGA is designed. The camera uses the large array CMOS sensor CMV12000 produced by the CMOSIS company and transfers the output data to the computer through Camlink interface. By using the FPGA as the core of timing control and completing the design of time-driving of CMOS sensor, output data remapping and Camlink interface with Verilog hardware language, the design of the camera is realized and a imaging experiment is carried out. The result shows that the driving sequence of the camera is reasonable and the communication with computer is correct. The camera operates stably and takes high quality images with the image resolution is 4096×3072.
In order to improve image processing quality and boost processing rate, this paper proposes an real-time automatic
image enhancement algorithm. It is based on the histogram equalization algorithm and the piecewise linear enhancement
algorithm, and it calculate the relationship of the histogram and the piecewise linear function by analyzing the histogram
distribution for adaptive image enhancement. Furthermore, the corresponding FPGA processing modules are designed to
implement the methods. Especially, the high-performance parallel pipelined technology and inner potential parallel
processing ability of the modules are paid more attention to ensure the real-time processing ability of the complete
system. The simulations and the experimentations show that the algorithm is based on the design and implementation of
FPGA hardware circuit less cost on hardware, high real-time performance, the good processing performance in different
sceneries. The algorithm can effectively improve the image quality, and would have wide prospect on imaging
processing field.
Recent years, infrared guidance technology has more and more applications in the field of precise guidance, because
it is not limited by the night or the meteorology.The development of infrared guidance technology depends on the
infrared image processing technology.This paper introduces an algorithm for infrared image nonuniformity
correction based in FPGA. It uses multiplication instead of division and adopts efficient pipeline technology to
reduce the system logic resource usage and improve efficiency of the system.Because infrared imaging is influenced
by environmental temperature, this pape proposes an infrared nonuniformity correction algorithm with the
compensation if environment temperature. This algorithm is very effective to reduce the influence of the environment
temperature on infrared imaging. This infrared image processing system for infrared imaging laid a foundation for
the application of the infrared guidance in the field of precise guidance.
KEYWORDS: Image processing, CMOS sensors, Field programmable gate arrays, Image sensors, Sensors, Signal processing, Imaging systems, Digital signal processing, Signal generators, Cameras
This article describes a method of the timing sequence design for CMOS image sensor LUPA-4000. A FPGA based imaging system with the function of adjustable integration time, multiple-slope integration, parallel integration an reading, windowing readout has been designed. This design can satisfy the frequency of 66M limit frequency of LUPA-4000 and 20 frames of a second. As the fixed noise of LUPA-4000 is aloud and the image is not clear, an efficient real-time image processing algorithm is also described in this paper. First a black image should be acquired as the fixed noise image. The real-time images can be send out after subtracting the noise image. This method can effectively eliminate the fixed noise o f the image, as the same time, the original image information has been maintained in the maximum degree. The test experiments on FPGA shows this design can drive LUPA-4000 working properly. Also this design takes full advantage of the accessibility features of the device, which provides a wider dynamic range and more flexible application of the device. The image sensor driven by this design improves imaging quality, which can be used for space exploration, especially for small space dynamic target tracking.
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