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As the most important error source in the heterodyne interferometer, the nonlinearity errors reduce the measurement accuracy in the nanometric or picometric measurement. This survey states both the definition of nonlinearity errors and the cause of the errors. Moreover, two kinds of methods for detection and compensation of the nonlinearity errors are also discussed respectively in this paper.

Vascular tree angiogram is an important tool for computer-aided diagnosis on the vascular disease. The vascular edge detection in the angiogram is an important step in the angiogram analysis and computer-aided diagnosis, which is the basis on the segmentation of angiogram. This paper studies an improved edge detection method based on several classical methods. The experiments demonstrate the improved method has good performance in angiogram edge detection. This method is easy to be used in the processing of angiogram.