IMAGE ENHANCING DEVICE, PROCESS FOR IMAGE ENHANCING AND COMPUTER-PROGRAM

摘要

Digital cameras are common in the everyday life and are used as web-cams, as handy-cams, as a substitute of the more traditional celluloid-based cameras, as measurement units and the like. Although digital cameras represent a well-established technology, many technologic challenges are still present. One problem is the well known current leakage in the pixels of the image sensors of the digital camera, which leads to different amplitudes for each pixel. This effect - also known as FPN fixed pattern noise - is dominant especially in CMOS sensors, but also present in CCD sensors. An image enhancing device (1) is proposed comprising a correction module (9) operable to correct the image by applying a correction term to the pixel values of the image and an estimating module (11, 12) operable to estimate the correction term, whereby the estimating module (11, 12) is operable to estimate and/or update the correction term on basis of a residue value from the image and/or a preceding image, whereby the residue value is defined as the sum of differences of the pixels and/or pre-corrected pixels with respect to their neighbours.