Abstract: The main criteria used to describe the geometry of agricultural objects are volume and axis measurements. Today accuracy of 10-30 percent is common in mechanical size grading system for potatoes. Electronic systems reach about 10 percent. The market standards are increasing and tolerance values are reducing. A system with tighter sizing parameters is definitely required, although it is envisaged that there will never be a need for micron resolution in size and general shape detection. Resolution in the range of about 1-2 mm is adequate. Agricultural products have allow unit value and many of them have to be handled in a short time period. Fast simple sensors are therefore needed including a simple, compact mechanical construction. Known optical methods are limited in respect of the numbers of 'viewpoints' of the object, which has a bearing on the accuracy. !2
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