img = np.zeros((512, 512, 3), np.uint8)

This line of code creates a NumPy array (img) with dimensions of 512x512 pixels and 3 color channels (red, green, and blue). Each pixel is represented by an 8-bit unsigned integer (np.uint8) which can have a value between 0 and 255. The initial values for all the pixels are set to 0, resulting in a black image.

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img = np.zeros((300, 512, 3), np.uint8)

This line of code creates a NumPy array called "img" with dimensions of 300 pixels in height, 512 pixels in width, and 3 color channels (RGB). Each element in the array is of data type uint8, which represents an unsigned 8-bit integer. Since all elements are initialized to 0, this array represents a black image.

bin_img = np.zeros(shape=timg.shape, dtype=np.uint8)

这段代码的作用是创建一个与`timg`具有相同形状和数据类型的全零数组`bin_img`。`shape`参数指定了数组的形状，`dtype`参数指定了数组元素的数据类型。在这里，`np.uint8`表示无符号8位整数，即像素值范围在0到255之间。通常，这个数组会被用来存储二值化后的图像，其中像素值为0或255。