YuanhaoGong
commented
7 years ago 不是。边界上用的是向前向后差分，而里面用的是中心差分。你建议公式的是向后差分的一半？我感觉不是很合理。
Best, Yuanhao Gong
Computer Vision Lab, ETH Zurich
http://e-collection.library.ethz.ch/eserv/eth:47737/eth-47737-02.pdf
PhD, ETH Zurich, Switzerland M.S., Xiamen University, China B.S., Tsinghua University, China
On Sat, Jun 3, 2017 at 3:47 PM, 汤成 notifications@github.com wrote:
在matlab代码CF.m 中求梯度的时候： function [gx, gy]=mygrad(im) gx=[im(:,2)-im(:,1) (im(:,3:end)-im(:,1:end-2))./2 im(:,end)-im(:,end-1)]; gy=[im(2,:)-im(1,:) ; (im(3:end,:)-im(1:end-2,:))./2 ; im(end,:)-im(end-1,:)];
这里面中间部分是不是 应该把(im(:,3:end)-im(:,1:end-2))./2 改成 (im(:,3:end-1)-im(:,2:end-2))./2
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tc-qaq
在matlab代码CF.m 中求梯度的时候： function [gx, gy]=mygrad(im) gx=[im(:,2)-im(:,1) (im(:,3:end)-im(:,1:end-2))./2 im(:,end)-im(:,end-1)]; gy=[im(2,:)-im(1,:) ; (im(3:end,:)-im(1:end-2,:))./2 ; im(end,:)-im(end-1,:)];
这里面中间部分是不是 应该把(im(:,3:end)-im(:,1:end-2))./2 改成 (im(:,3:end-1)-im(:,2:end-2))./2