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Superspeed dual-frame image acquisition method

An acquisition method and frame image technology, which can be used in image communication, TV, color TV parts, etc., can solve the problems of slow CCD readout speed and difficulty in meeting the instantaneous image data volume, and achieve high cost performance and improve single acquisition The effect of efficiency, broad applicability

Active Publication Date: 2014-11-19
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0004] The technical difficulty of applying ICCD to obtain two frames of high-resolution images with a time interval of microsecond or nanosecond is: the readout speed of CCD is relatively slow, and its frame frequency is between dozens of frames per second and thousands of frames per second. Satisfies the demand for such a large amount of instantaneous image data

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Embodiment Construction

[0030] The invention proposes an ultra-high-speed double-frame image acquisition method, which can be divided into two aspects: exposure time control and CCD high-speed double-frame image acquisition.

[0031] The control process of the CCD exposure time realizes the conduction or blocking of the incident light through the image intensifier, which is mainly used to adjust the length of the two exposure times, open or terminate the exposure of the pixels in the photosensitive area of ​​the CCD.

[0032] The CCD high-speed double-frame image acquisition process involves a special CCD charge transfer method and timing driving method. Different from the conventional CCD working process, the CCD performs two exposures first, and then stores the photogenerated charges generated by the two times in the photosensitive area respectively. Pixel and vertical registers, and finally output these two frames of images continuously.

[0033] The mode of work of the inventive method can be spe...

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Abstract

The invention provides a superspeed dual-frame image acquisition method which comprises exposure time control and CCD high-speed dual-frame image acquisition. The CCD exposure time control process realizes conduction or blocking of incident light through an image intensifier and is mainly used for adjusting the lengths of two-time exposure time, starting or ending exposure of CCD photosensitive area pixels. The CCD high-speed dual-frame image acquisition process mainly relates to a particular CCD charge transferring method and a timing sequence driving method. Different from the regular CCD working process, during the CCD high-speed dual-frame image acquisition process, CCD firstly carries out double exposure, stores photogenerated charges generated by the double exposure into the photosensitive area pixels and a vertical register respectively, and continuously outputs dual frame images finally. According to the superspeed dual-frame image acquisition method, the time interval for gathering the two frame images is only related to the time for transferring the photogenerated charge exposed for the first time to the vertical register and can reach 100ns scale.

Description

technical field [0001] The invention relates to an ultra-high-speed image acquisition method, in particular to a method for increasing the number of single-time acquisition image frames of an ICCD camera. Background technique [0002] ICCD usually consists of an image intensifier, a high voltage gate generator and a CCD camera. Due to the high gain and high-speed gating characteristics of the image intensifier, it is mainly used in the field of low-light imaging and transient imaging. In recent years, solid-state cameras based on CMOS chips have developed rapidly, and the frame frequency is getting faster and faster, and some can even reach a speed of one million frames per second. The pixel resolution is also significantly reduced to the level of kilopixels, which is difficult to meet the experimental requirements in the field of microsecond or nanosecond high-speed image diagnosis. The ICCD has a very high gating speed and pixel resolution, and is an important device in ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
Inventor 杨少华李斌康罗通顶郭明安夏惊涛严明李刚
Owner NORTHWEST INST OF NUCLEAR TECH
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