gray level thresholding

例句：

1. 1. Gray level thresholding is a technique used in image processing to convert images into grayscale.
   灰度阈值化是一种在图像处理中用来将图像转换为灰度的技术。
2. 2. In this method, the gray level thresholding is applied to the image to create a binary image.
   在这个方法中，将灰度阈值化应用于图像以创建二进制图像。
3. 3. The gray level thresholding is used to enhance the contrast of the image.
   灰度阈值化被用来增强图像的对比度。