The hardware platform of defects detection was composed for VFD display image by using PCI-1428 image acquisition card
CCD image sensor
camera and PC. VFD display image was acquired. Using software combination of LabVIEW and IMAQ-VISION
the system software were designed for image automatically montage
image defects detection
workstations control and database. Aiming at the characteristics of sampled VFD image
it was preprocessed by using gray-scale transformation
filtering
thresholding segmentation gray and image binarization methods to get good VFD image. Then the defects detection of VFD display image were completed
such as pictorial code
breaking codes
defects
flaws in letters' strokes. By test and actual operation
the experimental results showed that the system had a series of advantages. Detection speed and accuracy were high. Detection range was wide. Leaking inspection rate and false drop rate were lower. Detection results was ideal. It was achieved for the expected initial detection function and effect.