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We have studied automatic identification of cracks from borehole image under the support of Earth Scanning Association. As a part of this study, this paper discusses how to improve the accuracy of automatic crack identification. In this study, we used the S (Saturation) component of borehole image under the HSV color model and proposed a second segmentation to improve the accuracy. First, we do segmentation based on the statistics of saturation over a longer borehole section and use Hough Transform to determine the rough parameters of a crack, then, we shift the pixels in reverse direction to the sine curve estimated (sine curve correction), third, we define a rectangle region which includes the crack and weathered belt. Final, we do the second segmentation and Hough Transform again with this region to get the correction to the rough estimation. By correcting the rough estimation, we can get the accurate parameters of the crack. We tested this method with real borehole image data. The result shown that this method can improve the accuracy of automatic crack analysis, indicating that combined with other processing, automatic identification of cracks from borehole image can become practical.