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Non-contact detection based on image is an efficient detection method, during the detected, to obtain the image of the tooth profile of the taper thread accurately is the key of the detection. The existing image processing technique can not eliminating the influences of helix line to the thread image. Based on the problem of the tooth profile are shaded, analyzed the reason of the errors from the geometry relation of the thread, then get the differential equation. At last, established a system for detecting the thread, according to the differential equation, revised the taper thread tooth, extracting parameters. After the validations, the new method can improve the precise of measurement based on image, be used in both taper thread and parallel screw thread