关键词: 图像分割, 焊缝, 阈值分割, YUV颜色空间

Abstract: To deal with the problem of extracting the weld seam from color image, a fast weld seam extraction method based on color curve analysis is proposed in this paper. It transforms the color space from RGB to YUV and analyzes the color curve on the V channel to obtain a suitable threshold value for binarization. Then the V channel image is binarized and after operations of de-noising with morphology and merging the separated blocks, the segmentation template is obtained. Finally, the template is applied to the original color image to extract the weld seam. Experimental results on the application of extracting the weld seam from color images show that the proposed method can deal with an image （800×600） within 0.3 s and the accuracy ratio is 90% when the overlapped ratio of the extraction window is more than 70%, which verifies the high efficiency and accuracy of the proposed method.

Key words: image segmentation, weld seam, threshold segmentation, YUV color space