Because of difference on the gray - level and resolution - level between multi - source images, it is very difficult to register two images.
不同源图像间由于灰度和分辨率水平上的显著差异，使得两图像间的配准问题十分困难。
Because of the low resolution and few gray-level for B-ultrasonic images, we can hardly obtain satisfied result by the traditional edge detection methods.
由于B超图像的分辨率差、灰度级别少等特点，用传统的边缘检测方法难以得到满意的效果。
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