Introduction to Video and Image Processing by Thomas B. Moeslund

Author:Thomas B. Moeslund
Language: eng
Format: epub
Publisher: Springer London, London

Bounding box of a BLOB is the minimum rectangle which contains the BLOB, see Fig. 7.5. It is defined by going through all pixels for a BLOB and finding the four pixels with the minimum x-value, maximum x-value, minimum y-value and maximum y-value, respectively. From these values the width of the bounding box is given as x max−x min and the height as y max−y min. A bounding box can be used as a ROI.

Fig. 7.5(a) Bounding box. (b) Bounding circle. (c) Convex hull

Bounding circle of a BLOB is the minimum circle which contains the BLOB, see Fig. 7.5. It is found by first locating the center of the BLOB with one of the methods describe below. Next we search from the center and outwards in one direction until we find the point where the BLOB ends. The distance between this point and the center is the radius in this direction. We do this for all possible directions (for example with an angular resolution of 10°) and the biggest radius defines the radius for the minimum circle.

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