Robert Boschgmbh

Sasa Cvetkovic

Johan Leon Schirris

Jan Klijn

Paul Biezen

Peter Sturm

A method for obtaining and/or enhancing local contrast differences (LD) in digital image input data (in), wherein a local contrast measure (SAD) approximating a two-dimensional sum of absolute difference (SAD) measure is obtained by obtaining a first-dimension sum of absolute difference measure (energyV(m, n)) representing a sum of absolute difference (SAD) in a first dimension of at least one image region, and obtaining the local contrast measure (SAD) as a second-dimension convoluted first-dimension sum of absolute difference measure by convoluting the first-dimension sum of absolute difference measure (energyV(m, n)) in a second dimension of the at least one image region, is proposed, wherein the step of obtaining the local contrast measure (SAD) as the second-dimension convoluted first-dimension sum of absolute differences measure further includes an addition step wherein an energy term (&#x394;lpf(j)) representing a first-order difference on a distance (J) of a low pass filtered signal used in obtaining the first-dimension sum of absolute differences measure (energyV(m, n)) and in obtaining the second-dimension convoluted first-dimension sum of absolute differences measure is introduced while obtaining the local contrast measure (SAD).

Detection and/or enhancement of contrast differences in digital image data

Methods are described for processing an image signal for double or multiple exposure cameras in order to reduce fluorescent artifact effects.

Method for processing an image signal for double or multiple exposure cameras

The present invention relates to an image processing system, method and computer program for contrast enhancement of images, and more specifically to an improvement of multi-scale adaptive gain control of images. An image processing system () for contrast enhancement of an input image is proposed comprising an input module () for receiving the input image to be processed, a filtering module () operable to locally process the input image by filters of different scales k, whereby for each of the different scales k a locally processed image data and at least one statistic value LSD corresponding to the locally filtered image data is generated, a combining module () operable to locally combine the processed image data of the different scales k using a gain function G, thereby generating a contrast enhanced image o, wherein the gain function G is dependent on the statistic value LSD corresponding to the locally processed image data of the respective scale k, and an output module () for outputting the contrast enhanced image whereby the gain function G comprises at least one further local dependent correction term a; b; c; d in order to suppress artefacts in the contrast enhanced image.

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Eindhoven, Netherlands

Sasa Cvetkovic