Method for rapidly evaluating PRNU degradation after irradiation of image sensor based on non-uniformity of brightness of camera
An image sensor, non-uniformity technology, applied in the direction of image communication, climate sustainability, color TV components, etc., can solve the problem of rising time consumption
Pending Publication Date: 2022-07-05
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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Problems solved by technology
The test and estimation methods of image sensor PRNU and DSNU are constantly developing. At present, the two parameters are mainly evaluated based on the EMVA1288 standard. However, with the increase in the size and resolution of image sensors, the time required for testing has increased significantly.
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[0047] A method for rapid evaluation of PRNU degradation after irradiation of an image sensor based on the non-uniformity of camera brightness according to the present invention, the device involved in the method is a camera 1, a fixture 2, an image sensor 3, an integrating sphere 4, a computer 5 and a power supply 6, the image sensor 3 is installed on the camera 1, the camera 1 is fixed in the fixture 2, the integrating sphere 4 is placed at the front end of the fixture 2, the camera 1 is connected with the computer 5 and the power supply 6, and the specific operation is carried out according to the following steps:
[0048] a. Install the image sensor 3 on the camera 1, fix the camera 1 on the fixture 2, and then place the fixture 2 in front of the integrating sphere 4. The model of the CMOS active pixel sensor used in the camera 1 is AR0230, and its resolution The rate is 1920×1080;
[0049] b. Connect the camera 1 to the computer 5 and the power supply 6, turn on the power...
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The invention relates to a method for rapidly evaluating PRNU degradation after irradiation of an image sensor based on non-uniformity of brightness of a camera. Devices involved in the method comprise the camera, the image sensor, a clamp, a computer, a power supply and an integrating sphere. The method comprises the steps of firstly adjusting a clamp to enable a camera to be aligned with a light outlet of an integrator, enabling light emitted by the light outlet of the integrator to be uniformly imaged on a focal plane of an image sensor, then collecting images, analyzing the images through data processing software, substituting the images into a formula, and calculating to obtain image brightness non-uniformity. Mounting the irradiated image sensor on the camera, repeating the test steps, calculating the image brightness non-uniformity of the camera under different accumulated doses, and finally calculating according to the brightness non-uniformity of the camera before and after irradiation and the image sensor PRNU before irradiation to obtain the estimated value of the image sensor PRNU after degradation under different accumulated doses. According to the method, the degradation value of the PRNU of the irradiated image sensor can be rapidly evaluated, and the method is simple and high in practicability.
Description
technical field [0001] The invention relates to the technical field of image sensor performance evaluation, in particular to a method for rapid evaluation of PRNU degradation after irradiation of an image sensor based on the non-uniformity of camera brightness. Background technique [0002] In today's industrial production and daily life, cameras have become an important tool for collecting environmental information. Compared with expensive professional equipment, cameras have many advantages such as low price and convenient operation. The camera system generally consists of an optical system, an imaging system, a data processing and transmission system. The imaging system is an important part of the camera, and its performance determines the brightness non-uniformity of the camera system. The brightness of the camera system refers to the difference in the effect of the brightness after imaging in different areas. [0003] The operating conditions of the nuclear industry ...
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Login to View More IPC IPC(8): H04N17/00H04N5/235H04N5/217H04N5/225H04N5/374
CPCH04N17/002H04N25/63H04N23/56H04N23/74H04N25/76Y02E30/30
Inventor 李豫东王海川冯婕文林郭旗
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI