ens Shading Correction is a technique used in digital image processing to correct lens shading phenomena caused by camera lenses. Lenshading is a phenomenon in which the surrounding area of an image is expressed darkly due to the optical properties of the lens.

Lens shading is mainly related to the optical composition of the lens, the shape of the aperture, and the reflection inside the lens, and can be more pronounced, especially in wide-angle lenses or high-brightness conditions. These lens shading can reduce the contrast of contrast and color variations in the image, which can reduce the quality of the image.

Lenshading calibration is performed primarily on digital cameras or image sensors and can be implemented in software or hardware. To this end, the pixel value of the captured image is analyzed to identify the area where the lens shading occurred, and to correct the pixel value of the area. Because lens shading is typically stronger in the surrounding area than in the center area, it restores contrast and color uniformity by adjusting pixel values in the surrounding area.

Lenshading calibration is also used in conjunction with other image calibration techniques in image processing pipelines. For example, if you perform distortion correction and lens shading correction in combination with lens distortion correction, you can obtain a more accurate and quality image. In addition, lens shading correction can be combined with brightness correction, color correction, and white balance adjustment of the image to improve overall image quality.