movement to and fro according to a secant T the circumference.circular motion ( -) relative to a diameter generated by the rotation operator ( or of the turntable ).To do this we fix the first “degrees of freedom” processing ( fig 1a ), summarize ie in many ways and second directions and extensions such as the sub-tool it can be moved on the mirror. What in fact interesting to grattavetro is to know in advance as a mirror field will change its curvature as a function of a specific technique. Let us now go into more detail on the effects that this process produces on the curvature of the conic that is being generated at the moment when we use the sub-diameter to make corrections in certain areas. On that occasion, we examined the aspect relating to processing by identifying the zones or circular sectors in which the material removal takes place more or less effectively. The detection of the curve also allows, when they simultaneously acquire two facing pages of the book, to find the exact cutting point vertically, so as to allow even the automatic splitting.We have seen in a previous article the general operation of the technique of strokes with sub-diameter. That by analyzing the scanned image is able to identify and correctthe curve of the book automatically, obtaining digitized pages with sides perfectly parallel. To remedy this defect of the images has been developed a special technology, called Book Curvature Correction, This is caused by perspective distortion introduced by the scanning,Īccentuated by the distance is not constant due to the hardbound or the thickness of the book. Namely constituted by a species of sinusoidal curve. In essence, the top and bottom of each page, instead of being horizontal, or at least linear, appears as a wave, Mashed on a glass plate and the optical sensor is located at a substantial distance from the page, you can see on scanned images a
When digitize books using planetary scanner or digital camera, that is, you find yourself in situations when the page are
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