US 2003/0165193 A1Published application

Method for abstracting multiple moving objects

AssigneeHuper Laboratories Co., Ltd.

InventorsHSIAO-PING CHEN, CHOU-MING CHANG

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Abstract

A motion detection method is used to abstract multiple moving objects. The motion detection method uses a first frame and a second frame to locate the moving objects appearing in a fixed scene. The method includes calculating a difference of each pixel between the first frame and the second frame, comparing each difference with a first threshold value for generating a plurality of first contours, comparing each difference with a second threshold value for generating a plurality of second contours, picking any of the second contours which overlapped with the first contours for generating corresponding moving blocks, determining whether the pixels located outside the moving blocks are background pixels, and comparing the parameter of each background pixel located inside the moving blocks with its corresponding background value for determining pixels related to the moving objects.

A moving object segmentation method used by a detecting system, the detecting system comprising:

a frame generator for periodically picturing a scene according to a predetermined period to generate a plurality of image frames, each image frame comprising a plurality of pixels, each pixel comprising at least a reference parameter for describing characteristics of the pixel;
and
a calculating device for detecting moving objects moving inside the scene according to a first image frame and a second image frame generated from the frame generator, the first image frame being generated prior to the second image frame by an interval corresponding to the predetermined period;
the moving object segmentation method comprising:
(a)comparing the reference parameter of one pixel in the first image frame with the reference parameter of the same pixel in the second image frame to generate a corresponding difference value;
(b)comparing each difference value with a first threshold value and a second threshold value, the first threshold value being greater than the second threshold value, generating a plurality of first contours according to the pixels which are adjacent to each other and each having the difference value greater than the first threshold value, and generating a plurality of second contours according to the pixels which are adjacent to each other and each having the difference value greater than the second threshold value;
(c)selecting second contours that overlap the first contours for establishing a corresponding first moving area, the first moving area comprising every pixel associated with the selected second contours;
(d)determining whether the pixels outside the first moving area in the second image frame are registered as background pixels;
and
(e)comparing the reference parameter of the background pixel in the second image frame with a corresponding background value of the background pixel to determine whether the background pixel is related to the moving object.

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Abstract

Claims23