Abstract:

The projection transformation and the local weighted mean conversion method based on polynomial fitting is proposed to correct the deformation of weft knitted loop image, perspective and lens distortion which influences automatic identification accuracy of stitch structure. Combined with the need of the development for hand-held device, the standard templates were designed and feasible correcting process was set. A general scheme correction of the perspective distortion and lens distortion are designed in the paper. The correction scheme for fabric stitch distortion are also been discussed. The experiment results showed that the presented approaches have satisfactory effect for distortion correction of weft knitted fabric image.

Key words: automatic identification, weft knitted fabric, image destortion, projection transform, local weighted mean