How to draw histogram of hsv image?

Question

kalyani bedekar 2016-3-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/273563-how-to-draw-histogram-of-hsv-image

评论： sya zamani 2020-4-20

Using imhist we canget histogram of grayscale image. How to draw histogram of hsv image?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2016-3-15

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/273563-how-to-draw-histogram-of-hsv-image#answer_213674

在 MATLAB Online 中打开

Try this

hsvImage = rgb2hsv(rgbImage);
hImage = hsvImage(:, :, 1);
sImage = hsvImage(:, :, 2);
vImage = hsvImage(:, :, 3);
figure;
subplot(2,2,1);
hHist = histogram(hImage);
subplot(2,2,2);
sHist = histogram(sImage);
subplot(2,2,3);
vHist = histogram(vImage);

2 个评论
显示无隐藏无

Mario Castro 2018-2-7

this code do not show any result at all. HSV values are represented in % and degrees.

Image Analyst 2018-2-7

在 MATLAB Online 中打开

Of course it does. Did you even run the code? You need to have rgbImage already read in. Here, here is a more complete demo:

rgbImage = imread('peppers.png');
hsvImage = rgb2hsv(rgbImage);
hImage = hsvImage(:, :, 1);
sImage = hsvImage(:, :, 2);
vImage = hsvImage(:, :, 3);
figure;
subplot(2,2,1);
hHist = histogram(hImage);
grid on;
title('Hue Histogram');
subplot(2,2,2);
sHist = histogram(sImage);
grid on;
title('Saturation Histogram');
subplot(2,2,3);
vHist = histogram(vImage);
grid on;
title('Value Histogram');
subplot(2,2,4);
imshow(rgbImage);

请先登录，再进行评论。

Answer 2

Anand 2016-3-15

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/273563-how-to-draw-histogram-of-hsv-image#answer_213696

在 MATLAB Online 中打开

If you need the histogram only for visualization purposes, you can obtain it using the colorThresholder app.

Open the RGB image in the colorThresholder app and select the HSV color space. The right-hand pane will show histograms in H,S and V.

Open the image in the Color Thresholder:

>> colorThresholder(rgbImage)

Select HSV Color space.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

sya zamani 2020-4-20

Hi Anand, Sorry for the late question, do you know how to display the HSV histogram as shown in the colorThresholder app? Thanks in advance.

请先登录，再进行评论。

Answer 3

Yoon Thiri Zaw 2019-6-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/273563-how-to-draw-histogram-of-hsv-image#answer_379653

Can i find threshold values using Lab based color histogram? If having code, tell me please!

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Image Analyst 2019-6-18

Depends on what threshold divides your color channel into foreground and background. No one can tell without seeing your image and an explanation of what you want (foreground) and what you don't want (background) to segment.

请先登录，再进行评论。