Dynamic range extension method for transient imaging based on multi-frame exposure of image sensor
A technology of dynamic range extension and image sensor, which is applied in image communication, color TV parts, TV system parts, etc., can solve the problems of large error, complex system, expensive price, etc., and achieve good dynamic expansion effect and application Wide-ranging, system-simple effects
Active Publication Date: 2019-06-07
NORTHWEST INST OF NUCLEAR TECH
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[0004] In order to solve the technical problems of the existing image sensor transient imaging dynamic range expansion method that the system required is too complex, expensive, and large in error, the present invention proposes a transient imaging dynamic range expansion method based on image sensor multi-frame exposure, using This method requires a simple system for dynamic range expansion, low cost and small error
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[0038] The present invention will be further described below in conjunction with accompanying drawing.
[0039] see Figure 5 The method for extending the dynamic range of transient imaging based on the multi-frame exposure of the image sensor provided by the present invention specifically includes the following steps:
[0040]Step 1: Select the type of image sensor and image intensifier, where the image sensor is an interline transfer CCD image sensor or a global shutter CMOS image sensor with more than four tubes, the image intensifier is a long afterglow type, and the afterglow decay time is t λ It must be greater than the time for the image sensor to transfer the induced charge from its sensing area (ie photosensitive area) to the storage area;
[0041] According to the afterglow decay time t of the image intensifier λ and the image readout time of the image sensor t rd Determine the maximum number of exposures n of the image sensor; specifically, the value of n is give...
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The invention provides a method for extending the dynamic range of transient imaging based on multi-frame exposure of an image sensor. Coupling; during the transient phenomenon and the afterglow decay time of the image intensifier, the image sensor is exposed for n times; respectively, n frames of image data output by the image sensor for n times of exposure are obtained; image fusion. Only one ICCD or ICMOS camera consisting of an image sensor and an image intensifier is needed. By setting the opening time of the image intensifier and the exposure time and working mode of the image sensor, the dynamic range expansion of transient imaging can be realized, so the required system is simple , lower cost and less error.
Description
technical field [0001] The invention relates to a method for extending the dynamic range of transient imaging based on multi-frame exposure of an image sensor. Background technique [0002] High-speed cameras based on image sensors are widely used in the field of transient physical process research. There are two main types of image sensors commonly used at present: CCD image sensor and CMOS image sensor. In the transient physical application process, the high-speed camera generally forms an ICCD or ICMOS camera with an image intensifier, where the image intensifier has 10 2 ~10 5 The optical gain can compensate the loss of coupled light energy and play the role of optical gain. At the same time, the opening time of the image intensifier is 2 to 3 orders of magnitude faster than the electronic shutter or high-speed mechanical shutter device of a CCD or CMOS camera. Therefore, The image intensifier can be used as an optical shutter gating device to perform high-time-resolu...
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IPC IPC(8): H04N5/355H04N5/265
CPCH04N5/265H04N25/58
Inventor 严明刘璐杨少华李刚郭明安李斌康罗通顶
Owner NORTHWEST INST OF NUCLEAR TECH