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In order to realize roundness detection of rotary type parts in industrial field without interruption machining process, an image measurement method was proposed in this paper. Using adaptive threshold, the image edge can be determined by calculating modulus maximum in gradient direction in different scale. A single-pixel edge image will be obtained by synthesizing the multi-scale edge. Center drift problem in roundness evaluation had been solved by pole method. For improving efficiency and precision, a sub pixel roundness detection scheme was proposed by combining B- spline lifting wavelet with quadratic polynomial interpolation. The template part with known size was used to test the effects of different methods. The sub pixel technology can improve the resolution of image obviously. The experimental results show that the proposed detection method has better performance in terms of efficiency and accuracy compared with conventional detection methods. But the detection precision of proposed method was lower than that of roundness instrument measurement. There are still some work to be done in measuring method and denoising. For all that, the method can satisfy medium precision requirement in the general engineering application.

Research on Sub Pixel Roundness Detection Technology Based on B-spline Lifting Wavelet