Download e-book for iPad: A Practical Introduction to Computer Vision with OpenCV by Kenneth Dawson-Howe

By Kenneth Dawson-Howe

ISBN-10: 1118848454

ISBN-13: 9781118848456

Explains the idea in the back of easy laptop imaginative and prescient and gives a bridge from the idea to sensible implementation utilizing the commonplace OpenCV libraries
Computer imaginative and prescient is a quickly increasing quarter and it truly is turning into steadily more straightforward for builders to use this box as a result of the prepared availability of top quality libraries (such as OpenCV 2). this article is meant to facilitate the sensible use of machine imaginative and prescient with the aim being to bridge the space among the speculation and the sensible implementation of laptop imaginative and prescient. The e-book will clarify how you can use the suitable OpenCV library exercises and should be observed by way of a whole operating application together with the code snippets from the textual content. This textbook is a seriously illustrated, sensible advent to an exhilarating box, the purposes of that are turning into virtually ubiquitous. we're now surrounded through cameras, for instance cameras on pcs & pills/ cameras outfitted into our cell phones/ cameras in video games consoles cameras imaging tricky modalities (such as ultrasound, X-ray, MRI) in hospitals, and surveillance cameras. This publication is worried with supporting the subsequent new release of desktop builders to use these kinds of photos so as to advance structures that are extra intuitive and engage with us in additional clever methods.

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Extra resources for A Practical Introduction to Computer Vision with OpenCV

Example text

4 you should find it much easier to separate/segment the different trees in the colour image. 4 RGB colour image (left) and the same image in grey-scale (right) Humans are sensitive to light at wavelengths between 400 nm and 700 nm and hence most camera image sensors are designed to be sensitive at those wavelengths. Colour images are more complex than grey-scale images and are typically represented using a three-channel colour space (Koschan & Abidi, 2007), a number of which are described in the following sections.

10 HLS space. The different colours are around the circular hue axis, the depth of the colours is indicated by how far along the saturation axis the colour is (from the centre), and the luminance indicates the brightness. The space is shown as wide in the middle and smaller at high and low values of luminance as there is no effective/reliable colour information when something is very dark or very bright example, if averaging hue values 0, 178, 1, 177 and 179, the result should be 179, rather than 107!

0. 5 Other Colour Spaces There are a large number of other colour spaces available to use. Bear in mind that most of these are just alternative representations of the image. In theory, they contain no more or less information that an RGB image or a CMY image or HSV image. However, they do contain more information than a grey-scale image as in this case information has been discarded (in comparison to an original colour image). OpenCV provides support (in terms of conversion functions) for six other colour spaces: 1.

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A Practical Introduction to Computer Vision with OpenCV by Kenneth Dawson-Howe


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