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Motion and/or scene change detection using color components

A scene change and motion technology, applied in the field of motion and/or scene change devices, can solve the problems of high noise reduction, false motion, and emphasis.

Inactive Publication Date: 2008-05-28
SONY DEUT GMBH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] However, these scene change and motion detection methods are not satisfactory, still produce obvious false motion, and the amount of noise reduction is not as high as expected.
The prior art encounters problems especially with low-contrast images, like e.g. low-brightness images and images with high noise levels (due to e.g. the high sensitivity of an image acquisition device, e.g. digital but compressed images that can be processed at high resolution Encountered in Acquiring Devices), the problem is exacerbated by the combination of two opposing conditions

Method used

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  • Motion and/or scene change detection using color components
  • Motion and/or scene change detection using color components

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Embodiment Construction

[0019] A first embodiment of the present invention will now be explained with reference to the schematic block diagram of FIG. 1 . All the following processes are performed once for each image frame in a sequence, and are performed pixel by pixel, that is to say, the following steps are performed for each pixel of each frame. Of course it is also possible to apply the method to only a few frames in an image sequence and to a few pixels per frame. For example, the sequence of image frames is provided by a sequence of images contained in a video signal or television signal, or by a sequence of images produced by a video camera, but is not limited thereto. Other non-limiting examples are a series of image frames obtained by an X-ray imaging device eg for medical purposes or imaging or measurement purposes in scientific experiments.

[0020] In the drawings, "color1" and "color2" represent two color components of an image, which, for example, but not limited thereto, correspond t...

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Abstract

The present invention relates to the fields of motion detection, scene change detection and temporal domain noise reduction. Especially, the present invention relates to a device, a method and a software for detecting motion and / or scene change in a sequence of image frames. The device for detecting motion and / or scene change in a sequence of image frames comprises a difference generator adapted to calculate one or more differences between values of pixels of separate image frames, the pixel values comprising color information, and a discriminator for providing an indication whether the calculated one or more pixel value differences correspond to noise or correspond to image content based on the one or more pixel value differences.

Description

technical field [0001] The present invention relates to the fields of motion detection, scene change detection and temporal noise attenuation. In particular, it relates to apparatus, methods and software for detecting motion and / or scene changes in a series of image frames. Background technique [0002] Temporal filters and spatio-temporal filters are widely used to suppress noise in image sequences. Therefore, image frames are filtered out in the temporal domain. To deal with motion and scene changes, it is known to operate temporal noise reduction filters in a suitable way such that the effectiveness of the filtering operation can be temporarily weakened or even cut off when motion or scene changes are detected. This adjustment is typically based on differences in brightness values ​​between pixels, and the absolute value of these differences is compared to a threshold to determine the amount of filtering to apply to each pixel of each frame. Alternatively, a lookup tab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/14H04N9/64
CPCH04N5/147H04N7/2676H04N19/00921H04N7/26898H04N19/00587H04N5/144H04N19/51H04N19/87
Inventor 雷志春穆罕默德·希迪基克劳斯·齐默尔曼
Owner SONY DEUT GMBH
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