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Machine Vision, 3rd Edition by E. R. Davies

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Thresholding Techniques

An important practical aim of image processing is the demarcation of objects appearing in digital images. This process is called segmentation, and a good approximation to it can be achieved by thresholding. Broadly, this process involves separating the dark and light regions of the image, and thus identifying dark objects on a light background (or the inverse). This chapter discusses the effectiveness of this idea and the means for achieving it.

Look out for:

• the segmentation, region-growing, and thresholding concepts.

• the problem of threshold selection.

• the limitations of global thresholding.

• problems in the form of shadows or glints (highlights).

• the possibility of modeling the image background.

• the idea ...

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