Download Surface Inspection Techniques - Using the Integration of by M. L. Smith PDF

By M. L. Smith

This ebook brings jointly novel options in computer imaginative and prescient, special effects, and third-dimensional modelling, in fixing actual useful inspection difficulties. computerized inspection of three-d form and the research of either - and three-d floor defects and texture styles, represents some of the most difficult and speedily constructing functions for computer imaginative and prescient this present day.

This is the 1st booklet to incorporate a complete overview of current options for illness detection. It is going directly to enhance a brand new method of the matter of form research, floor inspection, and texture category. an easy, inexpensive demonstrator approach is defined. utilizing a hard and fast digicam and stuck computer-controlled illumination approach, this leading edge method bargains capability for brand spanking new purposes, thought of to be past the features of latest inspection innovations. an intensive remedy of underlying concept is given, together with enough aspect to permit program to genuine inspection initiatives. a variety of instance purposes are mentioned throughout a number of business sectors.

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Extra resources for Surface Inspection Techniques - Using the Integration of Innovative Machine Vision and Graphical Modelling Techniques

Sample text

At first this method would seem to offer the considerable benefit of only requiring a single acquired image, in which three separate lighting configurations are simultaneously distinct. The method, however, has the significant disadvantage that both object colour, or hue, as well as the degree of colour saturation, may also represent unknown variables. Taking an extreme case, the surface of a pure red object would appear black in all but the red light, leading to insufficient photometric data. Suitable calibration may be used to limit, but not eliminate the effect.

17 Coloured lighting configuration A differing approach also utilizing colour has been described by Drew [123], in which photometric stereo is achieved in a single view by using multiple illuminates which can be separated by colour. Unfortunately it is necessary to assume a uniform reflectance, and this would seem to limit application. By using a colour vision system and three primary coloured lights, one each of red, green, and blue, arranged as shown by Fig. 17, it would intuitively seem possible to isolate the contribution of each light source in a single acquired image.

The utilization of multiple images, and hence multiple illuminates, by the photometric stereo method, therefore facilitates the simultaneous mapping of multiple reflectance contour maps within the gradient space domain, as one per illuminate. Hence by using two illuminates, a and b, we now have two equations in two unknowns: Woodham [lo81 has shown that in limited cases, such as the reflectance function typical of planetary bodies, these equations are linear, and hence we may solve for p and q.

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