Fast and high-precision electronic multiplication ccd automatic gain system and method
A technology of electron multiplication and automatic gain, which is applied to the components of TV systems, TVs, electrical components, etc., and can solve the problems of short exposure time and immature gain control technology of electron multiplication CCD imaging system, etc.
Inactive Publication Date: 2014-10-08
NANJING UNIV OF SCI & TECH
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However, in high-speed imaging systems, the exposure time is limited by the frame rate. For example, for a high-speed camera with 1800 frames, the longest exposure time cannot exceed 1 / 1800s; in some cases with special requirements for the system frame rate, the actual exposure time The time may be very short, and adjusting the exposure time cannot meet the frame rate requirements. At this time, it is necessary to adjust the gain value G through automatic gain technology to obtain high-quality images
[0004] At present, there are related technologies to realize gain control in ordinary CCD imaging systems, but the gain control technology in electron multiplication CCD imaging systems is not yet mature
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[0019] figure 1 Design a block diagram for an electron-multiplying CCD auto-gain imaging system. The whole system is composed of EMCCD chip, AD data acquisition chip, FPGA chip, image output circuit, gain resistance lookup table and timing level conversion circuit, wherein the EMCCD chip, AD data acquisition chip, FPGA chip, and image output circuit are connected in sequence , the FPGA chip is connected with the timing level conversion circuit, and the timing level conversion circuit is connected with the EMCCD chip.
[0020] The EMCCD chip transmits the collected image information to the AD acquisition chip in the form of an analog signal; the AD acquisition chip converts the analog image signal into a digital image signal and transmits it to the FPGA chip; after the FPGA chip receives the digital image signal, it performs real-time calculations to obtain the next step Adjust the desired gain value and pass the gain value to the gain resistor lookup table. In addition to ca...
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The invention discloses a quick high-precision electric multiplication CCD automatic gain system and method. The system is formed by an EMCCD chip, an AD data acquisition chip, an FPGA chip, an image output circuit, a gain resistance searching list and a time sequence level conversion circuit, wherein the EMCCE chip, the AD data acquisition chip, the FPGA chip, the image output circuit are connected in sequence; the FPGA chip is connected with the time sequence level conversion circuit; the time sequence level conversion circuit is connected with the EMCCD chip. The system aims to a high-speed real-time electric multiplication CCD shimmer imaging system, an optimal gain regulating value is obtained via a real-time image signal acquired by the AD acquisition chip, as well as quick calculation and analysis of the image signal, executed by the FPGA chip; and the obtained gain value is used for regulating a voltage value of an electric multiplication CCD multiplication electrode, so as to achieve automatic gain of different scenes and improve imaging quality.
Description
technical field [0001] The invention belongs to a fast and high-precision electronic multiplication CCD automatic gain control technology proposed for the characteristics of a high-speed real-time electronic multiplication CCD low-light imaging system, in particular a fast and high-precision electronic multiplication CCD automatic gain system and method. Background technique [0002] Electron multiplication CCD is a CCD that adopts electron multiplication technology. The so-called electron multiplication technology refers to the technology that the signal is multiplied by the gain register using special technology before being transmitted to the readout register. Since the electron multiplier CCD amplifies the signal at the charge level, it has higher sensitivity than ordinary CCD and can image clearly under low illumination. At present, the electron multiplication CCD imaging system with electron multiplication CCD as the core has been more and more widely used in important...
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IPC IPC(8): H04N5/372
Inventor 何伟基陆震熙陈钱顾国华张闻文钱惟贤隋修宝屈惠明柏连发张毅路东明于雪莲
Owner NANJING UNIV OF SCI & TECH