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The book presents a unified approach for the parallelisation of important classes of image processing algorithms. With regard to the current literature, the contribution of this book is the generalisation and extension of the connected component approach to parallelise algorithms in the field of segmentation, contour extraction, and for the transition process from low-level to high-level image processing. A new formal definition of the watershed segmentation is presented which shows that the watershed transformation, which is an important image segmentation algorithm, can be viewed as an extension of the connected component algorithm. A similar approach is presented for the extraction of contour and line data, and for a parallel contour based classification algorithm based on Fourier descriptors