Download Bézier and Splines in Image Processing and Machine Vision by Sambhunath Biswas PDF

By Sambhunath Biswas

Digital picture processing and computer imaginative and prescient have grown significantly over the past few a long time. Of some of the ideas, constructed to date splines play a favorable and demanding function in lots of of them. powerful mathematical concept and straightforwardness of implementations is without doubt one of the keys in their luck in lots of study concerns.

This booklet offers with quite a few snapshot processing and computer imaginative and prescient difficulties successfully with splines and includes:

• the importance of Bernstein Polynomial in splines

• effectiveness of Hilbert experiment for electronic images

• unique insurance of Beta-splines, that are fairly new, for attainable destiny purposes

• discrete smoothing splines and their power in software

• snakes and lively contour types and their uses

• the importance of worldwide optimum contours and surfaces

Finally the e-book covers wavelet splines that are effective and powerful in several photo functions.

Dr Biswas is a approach analyst on the Indian Statistical Institute, Calcutta the place he teaches computer imaginative and prescient in M Tech (Computer Science). His examine pursuits comprise photo processing, computing device imaginative and prescient, special effects, trend popularity, neural networks and wavelet image-data analysis.

Professor Lovell is a examine chief in nationwide ICT Australia and study Director of the clever Real-Time Imaging and Sensing examine workforce on the college of Queensland. His study pursuits are at the moment focussed on optimum picture segmentation, real-time video research and face reputation.

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Additional resources for Bézier and Splines in Image Processing and Machine Vision

Example text

The algorithm shows the possibility of globally approximating many segmented regions or patches by a single polynomial function. In other words, one can think to model different regions in an image by a single polynomial surface. For this, all such regions should have similar graylevels. The segmented regions to be approximated by a single polynomial can be extracted under a single threshold. Thresholding based segmentation thus provides an advantage over the split and merge technique of segmentation [133].

The extraction of these minima from the histogram information sometimes may not be very reliable, because all desirable thresholds may not be reflected as deep valleys in the histogram. Also, the detection of thresholds is influenced by all pixels in the image. Several authors [1, 87, 131, 132, 135, 136] have used entropy as the criterion for object/background classification. , the higher order entropy of the image. For the set of images reported in [130], authors found that conditional entropy of the objects and background based on Poisson distribution produced better results compared to the methods in [135, 136, 87, 91].

Consider an L-level image F0 (x, y). The input gray image F0 (x, y) initially provides a threshold, s on application of the object/background thresholding algorithm. The threshold, s partitions the image F0 (x, y) into two subimages F01 (x, y) and F02 (x, y). The graylevels in F01 (x, y) lie in the interval 42 2 Image Segmentation [0, s] and in F02 (x, y), it is limited to (s, L − 1]. From the standpoint of object/background thresholding, F01 (x, y) can be viewed as the object while F02 (x, y) is the background, without loss of generality.

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