Flat field correction method for area array camera imaging

Abstract

The invention discloses a flat field correction method for area array camera imaging. The method comprises the following steps: a, obtaining a bright image (white) and a dark image (black) of a uniform sample; b, calculating fixed mode noise and photoresponse nonuniformity of the camera sensor; c, obtaining the nonuniformity of illumination imaging according to an actual imaging sample and the environment; and d, calculating coefficients of flat field correction, and correcting the collected image. By adoption of the method provided by the invention, the uniform sample does not need to be frequently used for performing the flat field correction, the sample easy to obtain can be selected according to the onsite condition to obtain the nonuniformity of illumination imaging, and meanwhile the fixed mode noise and photoresponse nonuniformity of the camera sensor are obtained in combination with the pre-obtained white image and the black image, therefore the flat field correction coefficient of the camera can be obtained conveniently and quickly.

Description

Technical field [0001] The invention relates to a correction method, in particular to a flat field correction method for imaging of an area scan camera. Background technique [0002] In the existing imaging technology, the imaging lens and the illumination will cause the unevenness of the image and affect the imaging result. At the same time, when the camera itself has fixed pattern noise or uneven light response, the collected images will also appear uneven. The non-uniformity correction method for illumination imaging only considers the non-uniformity of illumination and imaging, and does not correct the fixed pattern noise of the camera itself; the flat-field correction for the non-uniformity of the camera and the illumination does not take into account the correction process Complexity and frequency. For example, infrared area scan cameras are widely used in various infrared imaging systems such as surveying and mapping remote sensing, night vision reconnaissance, temperatu...

AI Technical Summary

Problems solved by technology

Due to the limitation of the current manufacturing level, there is generally non-uniformity in the response between the detection elements of the infrared area array camera. This non-uniformity forms a fixed pattern noise and affects the imaging quality of the system.