如何更改图像的背景颜色？ [英] How can I change the background color of the image?

问题描述

我希望删除/更改 Matlab中图像的背景颜色。

I want to remove/change the background color of an image in Matlab.

任何人都知道如何这样做？

Anyone know how to do this?

这是一个示例图片，我想删除绿色背景颜色。

Here is an example image, I want to remove the green background color.

http://cdn4.frip.in/wp-content/uploads/2013/05/custom-widget-area-for-wordpress.jpg

推荐答案

最简单的答案是，

c = [70 100 70];
thresh = 50;
A = imread('image.jpg');
B = zeros(size(A));
Ar = A(:,:,1);
Ag = A(:,:,2);
Ab = A(:,:,3);
Br = B(:,:,1);
Bg = B(:,:,2);
Bb = B(:,:,3);
logmap = (Ar > (c(1) - thresh)).*(Ar < (c(1) + thresh)).*...
         (Ag > (c(2) - thresh)).*(Ag < (c(2) + thresh)).*...
         (Ab > (c(3) - thresh)).*(Ab < (c(3) + thresh));
Ar(logmap == 1) = Br(logmap == 1);
Ag(logmap == 1) = Bg(logmap == 1); 
Ab(logmap == 1) = Bb(logmap == 1);
A = cat(3 ,Ar,Ag,Ab);
imshow(A);

您应该更改 c （背景颜色）和 thresh （ c 的阈值）并找到最适合你背景的。

You should change c (background color) and thresh (threshold for c) and find the best that fits your background.

您可以将 B 定义为新的背景图像。 Fr示例添加 Bb（：，:) = 255; 将为您提供蓝色背景。

You can define B as your new background image. Fr example adding Bb(:,:) = 255;will give you a blue background.

您甚至可以定义 B 作为图像。

You can even define B as an image.

为了检测背景，您可以找到图像中使用最多的颜色，但这是我认为不一定是背景。

In order to detect background you could find the color that is most used in the image, but that is not necessarily background I think.

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