| 摘要 |
The invention provides a unique method and apparatus to validate documents. Particularly, the method comprises forming a developable area on the surface of a paper document, scanning the surface before development, causing development, and then scanning the same surface after development so that a before and after scanning must meet predetermined signal acceptance criteria to provide a validation. The development is achieved by some external force or media acting on the document, with the document responding to such force or media to change its physical characteristics. The apparatus to achieve this sequence of method steps consists of appropriate testing areas incorporating radiant energy sources and appropriately responsive photocells, or other detectors, plus the development area and a validation circuit, all operating in cooperation to measure the surface appearance or characteristics before and after development of one or more portions of the document. Development normally is contemplated to be by heat, pressure, moisture, fumes, electric current, or the like.
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