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Method and apparatus for detecting and/or tracking image or color area of image sequence

A technology for detecting images and images, applied in image enhancement, image analysis, image communication, etc., can solve difficult problems and achieve simple and more accurate features, extraction and interrelationships

Inactive Publication Date: 2008-06-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can be difficult when there are several face regions or skin color regions in the image

Method used

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  • Method and apparatus for detecting and/or tracking image or color area of image sequence
  • Method and apparatus for detecting and/or tracking image or color area of image sequence
  • Method and apparatus for detecting and/or tracking image or color area of image sequence

Examples

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Embodiment Construction

[0040] An example of an application of the invention is a mobile video telephony communication system. The components of such a system are shown in block diagram form in FIG. 1 . In general, the system extracts and tracks face regions in a captured image sequence as described in our co-pending application GB2357650 and then encodes and transmits only the face regions for display in the receiver .

[0041] A mobile phone (not shown) includes a camera 2 that captures images of a user. Camera 2 is a known type of camera used in mobile video telephony, being part of the hand-held phone. In an alternative, the camera is a separate device connected to the handset, eg by wire or wireless communication. In this embodiment, the camera digitizes the image at CIF resolution (352 x 288 pixels).

[0042] The camera is connected to a signal processor 4 for processing the signals received from the camera 2 representing the captured images. The signal processor 4 is shown in more detail ...

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PUM

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Abstract

A method of detecting a region having predetermined colour characteristics in an image comprises transforming colour values of pixels in the image from a first colour space to a second colour space, using the colour values in the second colour space to determine probability values expressing a match between pixels and the predetermined colour characteristics, where the probability values range over a multiplicity of values, using said probability values to identify pixels at least approximating to said predetermined colour characteristics, grouping pixels which at least approximate to said predetermined colour characteristics, and extracting information about each group, wherein pixels are weighted according to the respective multiplicity of probability values, and the weightings are used when grouping the pixels and / or when extracting information about a group.

Description

technical field [0001] The present invention relates to a method and apparatus for detecting and / or tracking one or more color regions in an image. The invention is primarily concerned with the identification of skin color regions such as face regions in images. The invention is particularly intended for use in mobile video telephony, but can also be used in other applications such as security systems and teleconferencing systems. Our co-pending application GB2357650 illustrates an example of a mobile video telephony system using face detection and tracking. Background technique [0002] There are various known methods for detecting face regions in images. They include facial feature-based, action-based and color-based methods. Facial feature-based methods attempt to identify facial regions by detecting certain facial features such as eyes, nose, and mouth. Action-based methods operate on the principle that active regions in an image are likely to be faces. Color-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232G06K9/20G06K9/46G06T1/00G06K9/00G06T5/00G06T7/00G06T7/60H04N1/46H04N1/56H04N1/60H04N7/14H04N9/64
CPCH04N9/643G06T7/408H04N1/56G06T2207/30201G06K2009/3291G06K9/00228G06T7/90G06V40/161G06V10/62
Inventor J·库珀M·波贝尔S·帕沙拉基斯
Owner MITSUBISHI ELECTRIC CORP