Gammapreserving

Gammapreserving is a term used in the field of image processing and computer vision to describe a class of transformations that preserve the gamma correction of an image. Gamma correction is a nonlinear operation used to encode and decode luminance or tristimulus values in image and video signals, ensuring that the displayed image appears consistent across different devices and environments.

A gammapreserving transformation is a function that maps the pixel values of an image in such a way that the gamma-corrected version of the transformed image is identical to the gamma-correction of the original image. This property is particularly useful in applications where the gamma correction of an image needs to be preserved, such as in image editing, image analysis, and computer graphics.

One common example of a gammapreserving transformation is a linear transformation, such as scaling or shifting the pixel values. However, not all linear transformations are gammapreserving. For instance, a linear transformation that changes the gamma of an image would not be considered gammapreserving.

Another example of a gammapreserving transformation is a histogram equalization technique that is designed to preserve the gamma correction of the image. This involves transforming the pixel values in a way that redistributes the intensity values of the image while maintaining the overall gamma correction.

Gammapreserving transformations are also used in the context of image registration and image fusion, where it is essential to preserve the gamma correction of the input images to ensure that the output image appears consistent and visually pleasing. In these applications, gammapreserving transformations can help to maintain the integrity of the input images and produce more accurate and reliable results.