Algorithm, a key part of AOI (automatic optical detector) algorithm is applied to the field of detection. China has more than 20 kinds of visual AOI algorithm, each algorithm has its special purpose. Therefore, knowledge and understanding of the various AOI algorithm based on the use of AOI detection algorithm is applied to each item, is the premise of engineers produced AOI inspection programs.
Wrong parts, primarily for the detection element detecting body, whether a fault is detected the element material. The detections are routine detections AOI detection. Wrong parts can be four kinds of detection algorithms, which are four kinds of detection algorithm TOC algorithm, OCV algorithm, Match algorithm and OCR algorithms. Detection algorithm for each wrong parts of the test items is not the same emphasis.
TOC wrong parts detection algorithm class, mainly for error detection of non-member character class components, such as capacitors main element. Such detection by extracting body color element determines whether element body color change to detect wrong parts element. Body color parameter which elements, no default parameters are extracted parameters based on actual body color given color.
Wrong parts OCV detection algorithm class, mainly used to detect wrong parts clear character of the class components mainly for resistance. Such detection is by getting tested fit of character contour outline of the character and the character of the standard to determine whether a fault component parts. The default class detection range determination parameter is (0, 12). Such as standard character is ” 123 ”, test characters ” 351 ”, 28.3 Fitting the return value is determined in the range of (0, 12), the element occurs ” wrong parts ”.
Match type detection algorithm, is mainly used to detect wrong parts fuzzy character of the class components mainly for diodes, transistors and the like. Class detection algorithm is mainly measured by obtaining the character area and the degree of similarity standard character area to determine whether there is element ” ”. wrong parts Determine the scope of such wrong parts of default (0,32).
OCR type detection algorithms, mainly for detection important component elements, such elements mainly for BGA, QFP, BGA and so on. The main kind of algorithm is tested by identifying the character, the test determines whether the character is consistent with the standard character to detect and determine whether there is wrong parts. Such as standard character is ” 123 ”, actual character is ” 122 ”, the OCR algorithms determine the occurrence of such element ” wrong parts ”.