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By John G. Webster (Editor)

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Warping is also useful in a variety of situations. For example, it is possible to compensate for barrel or pin-cushion distortion using quite simple warping functions. Geometric distortions introduced by a wideangle lens or trapezoidal distortion due to viewing a scene from an oblique angle can also be corrected in a similar way. Hough Transform. The Hough transform provides a powerful and robust technique for detecting lines and collinear collections of disjoint spots in a binary image. We shall describe the simplest version of the Hough transform, which is intended to detect straight lines.

However, a hydraulic drive may exhibit dynamic behavior that is quite oscillatory. The main drawback is possible leaks in the closed oil-flow system. Pneumatic drive systems are quite effective when a large force is not required and a simple open/close operation suffices. They also do not require return circuits as hydraulic drive systems do. The main limitations are low positioning accuracy, low rigidity, and exhaust noise. Another concern closely related with choosing the power source is cables or hoses.

The technology has already shown itself to be capable of contributing to a very wide range of applications, but there are problems caused by the large amount of skilled engineering effort needed to tailor a machine to suit each particular application. Improved design aids are needed to circumvent this bottleneck, and these are currently being developed. This bottleneck currently provides one of the main obstacles to further growth in the technology. There is a never-ending quest for ever higher computing speeds in the image-processing subsystem, and some of the modern developments make the future look very promising.

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