| 摘要 |
The present invention relates to a system and method for scanning electronically acquired periodic images from an object and thereafter, inspecting the periodic images by using predetermined rules. The method to inspect the image includes an algorithm for analyzing the periodic patterns of the image and detecting deviations from numerical acceptance norms. In the system, the field of view of a camera, such as a video camera, viewing the object includes a two-dimensional image of the object. The camera captures the two-dimensional image of the object and converts the image into an array of scan lines, whereby each scan line represents a one-dimensional "slice" of target shape of the object. Hence, while all two dimensional images do not have periodic pattern, the array of scan lines represents a periodic pattern that is used by the algorithm in the inventive system. Alternatively, the camera may capture a scan line of a one-dimensional image with period elements, whereby the scan line represents a one-dimensional slice of target shape. Each slice is broken down into "segments" consisting of sets of adjacent pixels that are similar in brightness, hue, or both. The camera, in conjunction with processing by ancillary electronic data processing means and methods, delivers the slices with segments to the system where they are sequenced. The system identifies every slice and segment to determine what feature of the target shape the slice and segment represent. Thereafter, predefined rules are used to determine if each identified segment deviates from numerical acceptance norms. The method is thus used to analyze periodic elements of any arbitrary target shape, thereby working in a range of different object acceptance norms and being easily adaptable to change from one set of norms to another.
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