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.