Abstract
An image segmentation algorithm that performs pixel-by-pixel segmentation on an image with consideration of spatial information is described. The spatial information is the joint grey level values of the pixel to be segmented and its neighbouring pixels. The conditional probability that a pixel belongs to a particular class under the condition that the spatial information has been observed is defined to be the a posteriori spatial probability. A maximum a posteriori spatial probability (MASP) segmentation algorithm is proposed to segment an image such that each pixel is segmented into a particular class when the a posteriori spatial probability is maximum. The proposed segmentation algorithm is implemented in an <, iterative form. During the iteration, a series of intermediate segmented images are produced among which the one that possesses the maximum amount of information in its spatial structure is chosen as the optimum segmented image. Results from segmenting synthetic and practical images demonstrate that the MASP algorithm is capable of achieving better results when compared with other global thresholding methods.
Original language | English |
---|---|
Pages (from-to) | 161-167 |
Number of pages | 7 |
Journal | IEE Proceedings: Vision, Image and Signal Processing |
Volume | 144 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Jan 1997 |
Keywords
- Entropy
- Image segmentation
- Spatial information
- Thresholding
ASJC Scopus subject areas
- Signal Processing
- Electrical and Electronic Engineering