Vestel Elektronik Sanayi Ve Ticaret A.s.

Vestel Elektronik Sanayi Ve

Tarik Arici

Yucel Altunbasak

Toygar Akgun

Toygar Vestel Elektronik Ar-Ge AS Akgun

A method and apparatus is provided for adjusting the contrast of an input image. A blurred image corresponding to the input image is obtained, the brightness level of at least some of the pixels in the input image being varied to provide the blurred image. A ring likelihood for pixels in the input image is obtained, the ring likelihood providing a measure of the likelihood that said pixels are non-edge pixels in the neighborhood of an edge pixel. The output image is produced as a sum of the brightness levels in the input image and the blurred image in dependence on the ring likelihoods.

Method and apparatus for adjusting the contrast of an input image

A method and apparatus adjusts the contrast of an input image formed of pixels. Each pixel in the input image has an input brightness level. At least some of the pixels in the output or enhanced image have an output brightness level that is different from their input brightness level. Brightness level data of the input image is filtered to obtain a high frequency component of the input image in a single operational stage. The high frequency component is amplified. The original image and the amplified high frequency component are summed to produce brightness level data of the output image.

Method and apparatus for adjusting the contrast of an image

A composite video signal has a chrominance signal () and a luminance signal (). A method and apparatus are disclosed for adjusting the chrominance signal () to obtain an enhanced chrominance signal () in which at least some transitions in the enhanced chrominance signal () align more closely with edges in the luminance signal () than transitions in the original chrominance signal () align with edges in the luminance signal (). An edge in the luminance signal () of the composite video signal is detected (). The position of the edge relative to a current pixel is detected (). The chrominance of the current pixel is adjusted () in accordance with at least the position of said current pixel relative to the edge to obtain an enhanced chrominance signal ().

Method and apparatus for adjusting a chrominance signal

A method and apparatus for adjusting the contrast of an image, in which each pixel in the image has an initial brightness level that is within a range of brightness levels between a minimum brightness level and a maximum brightness level. For each brightness level within the range, the number of pixels that have the same initial brightness level is counted. The pixels are divided into at least two types by identifying the or each set of pixels having initial brightness levels in which each of a plurality of adjacent ones of said brightness levels has more pixels than a threshold number. The pixels of the plurality of adjacent ones of said brightness levels are treated as a first type. The remaining pixels are treated as a second type. For the or each set of pixels of the first type, contrast enhancement is carried out separately on those pixels.

A method and apparatus is disclosed for obtaining interpolation filters for use in a method or apparatus for enhancing the spatial resolution of a digital image. In the method or apparatus for enhancing the spatial resolution, input pixels from a low resolution image are classified and interpolated using the interpolation filters to form a high resolution image. The method for obtaining the interpolation filters includes obtaining a low resolution image from a high resolution source image. A plurality of pixels in the low resolution image are classified with respect to interpolation filters so that each of the plurality of pixels in the low resolution image is allocated to a respective interpolation filter. The interpolation filters are updated. The classifying and updating steps are repeated until a convergence criterion is met.

Method and apparatus for adjusting the resolution of a digital image

A method and apparatus for adjusting the contrast of an input image is disclosed. Brightness level data of the input image is filtered to obtain at least a low frequency component and a high frequency component. The high frequency component is amplified. The input image and the amplified high frequency component are summed to produce brightness level data of the output image. The filtering is carried out by at least one recursive infinite impulse response filter having a single delay coefficient that is adaptive to areas of high contrast in the input image.

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Marietta, GA, United States of America

Tarik Arici