Flat field correction method for area array camera imaging

A flat-field correction and area array camera technology, applied in the field of correction, can solve problems affecting system imaging quality, fixed pattern noise, etc.

Inactive Publication Date: 2017-09-22
武汉中导光电设备有限公司
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Problems solved by technology

Due to the limitation of the current manufacturing level, there is generally non-uniformity in the response between the detection elem

Method used

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Embodiment Construction

[0008] The following describes the technical solutions in the embodiments of the present invention clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0009] In an embodiment of the present invention, a flat-field correction method for imaging of an area scan camera includes the following steps: a. Obtain a bright image (white) and a dark image (black) of a uniform sample; b. Calculate the camera sensor itself Pattern noise and light response non-uniformity; c. Obtain the non-uniformity of illumination imaging according to the actual imaging sample and environment; d. Calculate the coefficients of flat-field correction and correct the collected images.

[0010] For the same c...

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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...

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Application Information

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IPC IPC(8): H04N5/217
CPCH04N25/63
Inventor 王建存赵润川李波
Owner 武汉中导光电设备有限公司
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