可视化matlab中的光流 [英] visualizing Optical flow in matlab

问题描述

我的图像尺寸为240 * 320，我的光学流量结果是垂直和水平值。我需要通过原始图像上的箭头来显示光流。我知道我必须使用箭袋功能。类似于：

I have an image with size 240*320 and I have the optical flow result with vertical and horizontal values. I need to visualize Optical flow by arrows on original image. I know that I have to use quiver function. Something like:

imshow(image)
hold on
quiver(vx,vy)
hold off

但我得到的是蓝色方块而不是箭头。

But what I get is a blue square instead of quivers.

推荐答案

一个完全蓝色的方块可能是因为太多的箭头靠近在一起绘制的。

An entirely blue square is probably caused by way too many arrows plotted close together.

例如，以下代码将生成一组易于查看（如果不是很有意义）的箭头：

For example, the following code will produce an easy-to-see (if not very meaningful) set of arrow:

figure
data = imread('peppers.png');
imshow(data)
s = size(data);
hold on
[x,y] = meshgrid(1:50:s(2),1:50:s(1));
px = cos(x);
py = sin(y);
quiver(x,y,px,py)

这将产生一个完全蓝色的情节：

And this will produce an entirely blue plot:

figure
data = imread('peppers.png');
imshow(data)
s = size(data);
hold on
[x,y] = meshgrid(1:1:s(2),1:1:s(1)); % arrow spacing is too close! 
px = cos(x);
py = sin(y);
quiver(x,y,px,py) 

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