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A full-sky autonomous star map identification algorithm based on radial and cyclic features is proposed. The algorithm defines a star pattern, composed of radial angular distances and circular angles. Then, a three-step strategy is adopted to find the correspondence of the sensor pattern and the catalog pattern, including initial lookup table match, cyclic dynamic match, and validation. A number of experiments are carried out on simulated and real star images. The simulation results show that the proposed method provides improved performance, especially on robustness against up to 6 false stars. Also, the average identification time is about 45ms, and memory requirement is 16MB, having a good satisfaction to the requirements of the target system.

The Low level light sensor has evolved from early ICCD device to EMCCD that appeared at the beginning of this century. With the continuous progress of CMOS technology, the scientific CMOS sensors were developed, which have been used for industrial cameras in high sensitivity imaging. This article described a low level light CMOS detector and its associated camera, which were developed by Beijing Institute of Space Mechanics and Electricity (BISME) in cooperation with a domestic detector manufacturer. We had an in-depth discussion of the chip's high sensitivity design techniques and analyze the weak charge transfer optimization mechanism. Then both the CMOS and EMCCD detector were combined with lens and video processing circuits to conduct a laboratorial test, finally low light detection performance of them were compared and analyzed. The SNR of CMOS imaging circuits was basically equal to the EMCCD imaging circuits when the camera's entrance pupil radiance was less than 0.5E-05 W/m2 /sr, when the radiance was up to 2E-05 W/m2 /sr, the SNR of CMOS circuits was about 2dB better than the EMCCD circuits.

A multi-channel CCD signal processing system is introduced in this paper. It is used to drive CCDs to operate, to receive output image signals from CCD, then to implement data processing and encoding, finally to send out the data to a receiving system. Three boards in traditional remote sensing camera electronic system are integrated into one board with the same function in this system. FPGA is used as a core device for system control and data processing. Framework and software of the new design are presented in this paper, and test results are shown at last. Application shows that the design method can accomplish all the functions of the required. After integrated, interfaces between boards are simplified, scales of hardware and software are reduced, and system stability and reliability are improved. It is very valuable in engineering application.

A high-speed multi-channel multi time delay and integration charge couple device(TDICCD) image acquisition and processing system is introduced in this paper. FPGA is the core logic control of the system. The main hardware component of the system and the implementation method of FPGA are described and the diagrams of main modules are presented. Software workflow and a variety of image processing methods are also given. Test results show that the design achieves data transfer speed of 2.4Gbps and realizes real-time processing of image for high-speed multi-channel TDICCD camera so that meets the system requirement.

Culture logo is the symbol and sign of urban culture. This paper analyzes the specific meaning of culture logo, the system elements of urban culture logos and the procedure for constructing this system. The system of culture logos can highlight the characteristics of urban culture, upgrade the city's culture level and promote the organic integration and common progress of urban culture, economy and society.