Image analysis – Pattern recognition – Feature extraction
Patent
1995-12-28
1998-07-28
Johns, Andrew W.
Image analysis
Pattern recognition
Feature extraction
382206, 382194, 382195, 382199, 382221, 382239, 382118, 348415, 3582612, G06K 946, G06K 952, G06K 948, G06K 968
Patent
active
057871990
ABSTRACT:
An apparatus, for use in a low bit-rate image signal encoder, for detecting a foreground region in an image signal, wherein the image signal has a number of objects therein and the foreground region has at least one moving object therein, which comprises: a previous frame memory for storing a previous frame of the image signal; a current frame memory for storing a current frame of the image signal; a change detector for comparing the current frame and the previous frame to detect changed pixels, each changed pixel having a differential luminance value; a region detector for detecting an object region for one of the objects in the current frame; and a foreground/background determinator for counting the number of all of the pixels contained in the object region to determine a first size of the object region; and for counting the number of changed pixels which are located in the object region to determine a second size of the object region; and for comparing the first size with the second size to determine whether the object region is the foreground region.
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Daewoo Electronics Co. Ltd.
Johns Andrew W.
Shalwala Bipin
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