Image edge is detected by the third central moment of its immediate pixel neighborhood.

利用像素邻域的三阶中心矩，可以提取图像边界。

youdao

Would it be more efficient to just do it pixel-by-pixel?

会是更有效的就去做逐像素？

youdao

But I think what you really want, which is a pixel-by-pixel all-bands-at-once iterator.

但我想你真的想一想，这是一个像素由像素迭代器都带一次。

youdao

But I think what you really want, which is a pixel-by-pixel all-bands-at-once iterator.

但我想你真的想一想，这是一个像素由像素迭代器都带一次。

youdao