photo response non uniformity
Light response non-uniformity of light response non-uniformity: each pixel when the CCD in the uniform light irradiation, CCD devices have a light response non-uniformity (PRNU)? It is mainly concerned with the device manufacturing process, the near-infrared light in silicon The penetrating ability, PRNU also affected by the substrate material of the non-uniformity. PRNU no certain law varies by device and it is very random. Therefore, for weak signal applications, should be measured, and then be compensated in order to achieve uniformity of response. Open Category: CCD "light response non-uniformity" Related Entries: What is the relevant term to improve my
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Visible area array CCD response non-uniformity of the detection and correction Detection and Correction of Response Non-Uniformity Based on Visible Light Area CCD
Liu Yanyan Li Guoning Zhang Yu Li Hongzuo Abstract By analyzing the visible area array CCD response non-uniformity, a suitable response to all area array CCD detection system of non-uniformity. Detection system using the full frame array CCD485 surface radiometric calibration were established Array CCD485 digital image gray value and the integrating sphere exit response relationship between irradiance and the response curve depicted. Calibration obtained from the digital image acquisition can be seen that the value of a clear jump intensity, the response non-uniformity of more than 5%, when taking pictures in dim light will seriously affect the image quality, it must be corrected. According to area array CCD response curve to select the non-uniformity correction algorithm, taking into account the response of area array CCD485 is linear, this uses a two point correction algorithm, seeking to come forward each pixel CCD array calibration factor (gain and offset ), and stored in the correction matrix, the product of addition operation by the calibration of each pixel of the signal into a CCD area array, the average signal value. Experimental results show that two point correction algorithm to the response area array CCD485 reduced to non-uniformity of the original 1 / 10, is a practical and effective correction. Area array CCD responsivity label non-uniformity correction algorithm for two calibration area CCD responsibility non-uniformity correction two-point correction algorithm
AbstractThrough analyzing response non-uniformity of visible light area CCD, a kind of system that is used to response non-uniformity detection had been presented, and it is applied to all kinds of area CCD. After radiation scale was done for area CCD485with this system , the respond relation was established between the gray value of digital image and radiation luminance which integration sphere exported, and responsibility curve was also described. From the digital image that can be gathered, it can be find out the gray value have obvious jump, response non-uniformity has exceeded 5%. When taking pictures under weak light, it will be serious to affect the quality of pictures, so must be rectified. Correction algorithm is selected according to the responsibility curve of area CCD. Because of the area CCD485's responsibility is linear, so here have adopted two-point correction algorithm, calculate the correction factors (gain and offset) of all pixels, and put them into correction matrix. Through multiplication and addition operation, the signal of every pixel is rectified into the average signal of area CCD. Experiment result shows that two-point correction algorithm makes response non-uniformity of CCD485arrive original 1 / 10, it is a practical effective method of correction.
Fund "863" Project Foundation (No. 863-2-5-1-13B)
Revised Date 2010-1-15
Author View Liu Yanyan: Changchun Institute of Electronic and Information Engineering University, Changchun 130022, China
Li Guoning: Changchun Institute of Optics Fine Mechanics and Physics, Changchun 130033, China
Zhang Yu: Changchun Institute of Electronic and Information Engineering University, Changchun 130022, China
Li Hongzuo: Changchun Institute of Electronic and Information Engineering University, Changchun 130022, China
Contacts of Liu Yanyan
About Liu Yanyan (1981 -), female, Jilin Taonan, lecturer, master, mainly in optical imaging technology, digital image processing and other aspects of research.
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