Robert Boschgmbh

Koninklijke Philips Corporation N.V.

Johan Leon Schirris

Jan Klijn

Sasa Cvetkovic

Paul Biezen

David Keith Roberts

Franciscus Herman Maria Bergen

Peter Sturm

Ronald Simon Antonius Schram

Sacha Cvetkovic

Piet Dielhof

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.

Image processing system, method and computer program for contrast enhancement of images

The invention relates to an image pickup apparatus () comprising an image pickup means () for forming a plurality of image signals (S,L) having different exposure conditions, combining means for combining said plurality of image signals (L,S) to form a combined image signal having an extended dynamic range, further comprising display and/or recording means () for displaying and/or recording said combined image signal, further comprising a function module () correcting at least one of the image signals (L,S) in order to achieve a smooth transition between the image signals (S, L) at a transition point.

Image data processing apparatus with image pickup means

In a color separation circuit, a camera comprising such a color separation circuit and a color separation method, an adapted luminance signal is recovered from an image sensor signal using an adaptive wide band filter, wherein the adaptive wide band filter is controlled by the amount of a diagonal energy in the image sensor signal.

Color separation

A method and system for embedding an authentication signature in an audio-visual signal such that only a part of an entire frame of the audio-visual signal is stored in a memory while the signature bits are calculated and the watermark is embedded. A signature is formed based on a first portion of said audio-visual signal, whereby said first portion is a pattern of horizontal lines of said audio-visual signal and has fewer lines than the number of lines of the entire audio-visual signal. Thereafter the signature generated is embedded in said audio-visual signal in the first portion and/or in another portion of the frame to be authenticated, whereby the other portion also is a pattern of horizontal lines. Thus only memory for some lines instead for all lines of the audio-visual signal is needed. In the case of an interlaced audio-visual signal, the first portion is preferably the first field of a frame of said audio-visual signal and the second portion is the second field of said audio-visual signal. In the case of a non-interlaced audio-visual signal, slices of said lines are preferably used for said portions.

Real-time signature embedding in video

A multi-picture in picture system in which each camera is coupled in a daisy chain adds its part of the complete picture on a CVBS-line. The television/monitor doesn't have to prepare the complete picture because each camera does it. Furthermore, no problems with locking occur because each camera adds its picture at the 'place' where it is also locked.

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Eindhoven, Netherlands

Johan Leon Schirris