The invention relates to a non-
woven fabric defect identification method, which comprises the following steps of: 1, performing
signal acquisition on a moving non-
woven fabric to be detected by adopting a line camera to obtain a line video
signal; step 2, performing shadow correction on the line video
signal; step 3, comparing the line video signal after shadow correction with a set threshold range, and screening bright pixel points and / or dark pixel points; step 3, performing 2D
processing on the line video signal after shadow correction, and synthesizing a plurality of adjacent line video signals into a frame image to obtain a 2D video signal; step 4, carrying out
noise reduction
processing on the 2D video signal by adopting low-pass filtering; step 5, carrying out coloring
processing on the 2D video signal after
noise reduction processing; and 6, identifying the sizes of the color marking blocks, comparing the sizes with a set threshold Hm, and screening out the color marking blocks which are greater than or equal to the threshold Hm, namely defects. According to the method, the defects of the traditional plain non-
woven fabric can be identified, and the defects of the punched and embossed non-woven fabric can also be accurately identified.