Line Detection, Image-based Pcb Board

PCB is very important in modern electronic equipment, its quality has direct impact to the product function, At present, PCB quality inspecting is completed mostly from manpower visual measurement, and the mistake check up happened and misses. PCB industry needs the online automation detecting therefore urgently.Owing to that the image PCB checks system on line, mainly, the pretreatment, border detecting , the PCB allocation and blemish image detecting including image acquisition , the image distinguish several links. Priority has written the main body of a book with regard to several the following problems studying concretely:The image pretreatment is premise and basis checking system on line, The article uses middle value wave filtering law and mean value wave filtering improving to follow the noise dislodging an image, Algorithmic image of Laplace-based strengthening, Adopt maximal kind room method difference to follow the value carrying out two on PCB spending treatment; PCB image edge detecting studies middle , the main body of a book adopt the because of all-direction , many dimension mathematics morphological approach detecting image border to law; On the PCB allocation, Improvement Hough method the main body of a book is applied gives a test to circular PCB allocation sign, has studied and the concrete realization algorithm, good by the fact that the experiment testifies this method is to compare algorithm; In the PCB blemish distinguishing, the method based on multipy form board reference blemishes inspect up out method, have reserved the reference comparison method advantage on speed and highly improved the systematic detecting ability; the based on mul-board image structure characteristic syntax structure blemish distinguishes method uses mathematics morphology theory to abstract the form board image structure characteristic, and the combination between the structure characteristics and the syntax structure blemish distinguishing is beneficial to improving blemish pattern recognition speed and accuracy, having an arithmetic small, calculate the quick characteristic of speed.