Transient imaging dynamic range expanding method based on attenuation mask
A dynamic range extension and high dynamic range technology, applied in image communication, color TV parts, TV system parts, etc., can solve the problems of system complexity, high price, and influence of image fusion results, etc., and achieve a simple system structure , achieve low cost and wide application range
Active Publication Date: 2018-03-30
NORTHWEST INST OF NUCLEAR TECH
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However, the disadvantage of this method is that the system is too complex and expensive, and the error between multiple images caused by optical alignment will also affect the final image fusion result
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[0030] A method for extending the dynamic range of transient imaging based on an attenuation mask proposed by the present invention, the specific implementation steps are as follows:
[0031] Step 1: According to the afterglow luminescence spectrum characteristics of the image intensifier and the pixel size characteristics of the image sensor, the mask hole array is designed and processed, so that after the afterglow image of the image intensifier passes through the mask hole array, the intensity attenuation coefficient has a relatively large spatial distribution. big difference; as figure 2 shown;
[0032] Step 2: CCD or CMOS image sensor is coupled with image intensifier and mask hole array to form ICCD or ICMOS camera. The coupling structure is as follows figure 1 As shown; in the figure, 1 is an image intensifier, 2 is an attenuation mask, 3 is a coupler, and 4 is an image sensor;
[0033] Step 3: For the coupled imaging system, set the gate opening time and gain voltag...
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The invention provides a transient imaging dynamic range expanding method based on an attenuation mask and is applicable to image diagnosis of a transient process. The system structure is concise andthe realization cost is low. An imaging system employed by the method is formed by sequentially coupling an image intensifier, the attenuation mask and an image sensor, wherein the attenuation mask isa mask hole array which is designed and processed according to the afterglow emission spectrum characteristics of the image intensifier and the pixel size characteristics of the image sensor. The method comprises the following steps: by use of a high time resolution shutter function, the scene of a transient phenomenon at a certain moment is frozen; by use of the position selective light attenuation effect of the attenuation mask, multiple sub-images with different attenuation coefficients are obtained, wherein sub-images with smaller attenuation coefficients can obtain scene images with lower luminance and sub-images with larger attenuation coefficients can obtain scene images with higher luminance; and transient images with high-resolution and a high dynamic range can be obtained through sub-image interpolation calculation.
Description
technical field [0001] The invention relates to a method for extending the dynamic range of transient imaging, in particular to a method for extending the dynamic range of transient imaging that can be applied to time-resolved image diagnosis in a transient process. Background technique [0002] High-speed cameras based on image sensors and image intensifiers 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 study of transient physical processes, due to the extremely high requirement for time resolution, high-speed cameras generally use image intensifiers to form ICCD or ICMOS cameras, where image intensifiers usually have 10 2 ~10 5 The optical gain can compensate the energy loss in the optical coupling process 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...
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IPC IPC(8): H04N5/225H04N5/232H04N5/235
CPCH04N23/54H04N23/55H04N23/951H04N23/741
Inventor 严明杨少华李刚刘璐郭明安李斌康
Owner NORTHWEST INST OF NUCLEAR TECH