Target detection in smoke environment using laser active imaging is of great research significance. According to the characteristics of light propagating in smoke environment, the method of laser transmission imaging is adopted and polarization-difference (PD) imaging technology is used to suppress the effect of scattering light on imaging quality. PD imaging method needs to record two target images of different polarization directions and then the two images are subtracted. A correction factor α is used to match the scattering light intensity of the two images, so scattering light can be mostly filtered out. Experiments show that the quality of images obtained by PD imaging method is better than intensity ones. The PD images have big noisy when smoke concentration is high. A method which combines median filtering with multi-scale morphological edge detection is proposed to process images. It can suppress image noise, improve image contrast and edge sharpness effectively.
The high resolution and large image area of long-range digital imaging system is designed by using a KAF-16803 area
CCD. The long-range digital imaging system can avoid the radiation to the operator. The imaging system consists of the
clock sequencer generation unit, the CCD drive circuits unit of clock sequencer, the video signal processing unit,
high-speed data optical fiber transmission unit, high-speed data acquisition unit and software. The performance of this
system are as the following: 4kx4k; 100% fill factor; 16bit A/D; exposure time flexibility adjusted range from 5μs to 5s;
single module optical fiber transmission, 40km; These features make the long-range digital imaging system for
applications in Astronomy, Industrial, Security and life sciences fields.
For low light level applications, A compact and fully integrated, high-frame-rate and intensified shuttered Electron
Multiplying Charge Coupled Device digital image acquisition and analysis system has been developed. The system
integrates high-speed data acquisition, image playback, and image processing features. Basing on the a
backside-illuminated, 128x128 pixels, frame transfer electron multiplying Charge-coupled device imager with a high
quantum efficiency and one video output, A camera operating at up to 800 frames per second has been manufactured.
The camera was to be able to do low light level imaging using of the electron multiplying. The camera is coupled with a
second generation (Gen II) image intensifier by lens and makes it an IEMCCD camera. The system designs are described,
including the clock sequencer generation of the image sensor, the power driving of clock sequencer, the video signal
processing, high-speed data optical fiber transmission and high-speed data acquisition. The dynamic range and the
sensitivity of the EMCCD camera are introduced, and the results are given.
This paper presents a high frame rate Charge Coupled Device (CCD) image acquisition system. The emphasis is the data
transmission and the data recording technology. The DALSA CCD camera head CA-D6 is utilized as the system imaging
unit. The CA-D6 output 35 pairs and input 2 pairs Low Voltage Differential Signals (LVDS) are analyzed. The switch
from LVDS to TTL signals is implemented. A pair of Agilent data transceivers HDMP-1022/HDMP-1024 is used to
encode/decode the digital image data. The system timing block is designed on Complicated Programmable Logic Device
(CPLD) technology. The internal program is explored on VHDL and schematic combination technology. The optic-fiber
transceiver HFCT-53D5 is applied to complete the data transmission to remote area. The VC++ environment application
software is developed based on data the acquisition card PCI-7300A. The imaging system can work at the frame rate of
up to 955fps. The transmission data rate can reach 1Gbps, and it can transmit the image data beyond 1.5 km area. The
system can be used in remote high-speed image acquisition field such as explosion analysis and radiation diagnosis.
This paper presents high frame rate imaging systems developed in Northwest Institute of Nuclear Technology in recent
years. Three types of imaging systems are included. The first type of system utilizes EG&G RETICON Photodiode Array
(PDA) RA100A as the image sensor, which can work at up to 1000 frame per second (fps). Besides working
continuously, the PDA system is also designed to switch to capture flash light event working mode. A specific time
sequence is designed to satisfy this request. The camera image data can be transmitted to remote area by coaxial or optic
fiber cable and then be stored. The second type of imaging system utilizes PHOTOBIT Complementary Metal Oxygen
Semiconductor (CMOS) PB-MV13 as the image sensor, which has a high resolution of 1280 (H) ×1024 (V) pixels per
frame. The CMOS system can operate at up to 500fps in full frame and 4000fps partially. The prototype scheme of the
system is presented. The third type of imaging systems adopts charge coupled device (CCD) as the imagers. MINTRON
MTV-1881EX, DALSA CA-D1 and CA-D6 camera head are used in the systems development. The features comparison
of the RA100A, PB-MV13, and CA-D6 based systems are given in the end.