I am using a colour image to create a 3-d plot of pixel intensity. I have to turn it gray for the project to work, but I would like to know how to make the 3-d plot of pixel intensity, on the original without changing its colour.

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Vladimir Zorin 2016-4-25

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评论： John BG 2017-2-23

f1-38-6st.jpg

close all;clc;clear all;
resize_value = 0.3; % 0From to 1
% TraceImage = imresize(rgb2gray(imread('Trace6.jpg')),resize_value);
TraceImage = imresize(rgb2gray(imread('f1-38-6st.jpg')),resize_value);
original = TraceImage;
bw = im2bw(TraceImage,graythresh(TraceImage)); %
% 3D http://www.mathworks.com/matlabcentral/answers/91442-how-do-i-create-a-3-d-plot-of-the-pixel-intensity-of-an-image-in-matlab
I=TraceImage;
[x,y]=size(I);
X=1:x;
Y=1:y;
[xx,yy]=meshgrid(Y,X);
i=im2double(I);
figure;mesh(xx,yy,i);
colorbar
figure;imshow(i)

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Answer 1

John BG 2016-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/280955-i-am-using-a-colour-image-to-create-a-3-d-plot-of-pixel-intensity-i-have-to-turn-it-gray-for-the-pr#answer_219407

在 MATLAB Online 中打开

What you call pixel intensity, is the grey scale, or luminance.

The link you have is just a NxM grey scale.

What you seem to want is to go from NxMx3 coloured image to grey scale and back.

Have a look to my answer: http://uk.mathworks.com/matlabcentral/answers/273939-how-to-convert-stance-image-from-index-to-grayscale

Basically, you translate RGB to greyscale with

A1=A(:,:,1);A2=A(:,:,2);A3=A(:,:,3)
Y_CCIR601=.299*A1+.587*A2+.114*A3

If you find this answer of any help solving your question,

please click on the thumbs-up vote link,

thanks in advance

John

jgb2012@sky.com

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Vladimir Zorin 2016-4-27

A1=A(:,:,1);A2=A(:,:,2);A3=A(:,:,3) Y_CCIR601=.299*A1+.587*A2+.114*A3

Where should I put this, in which line on the work sheet?

John BG 2017-2-23

在 MATLAB Online 中打开

A=imread('flip_this.jpg');
imshow(A)
A1=A(:,:,1);A2=A(:,:,2);A3=A(:,:,3);
surf(Y_CCIR601,'LineStyle','none')
colorbar

.

If you find this answer of any help solving your question,

please click on the thumbs-up vote link,

thanks in advance

John

<mailto:jgb2012@sky.com jgb2012@sky.com>

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Answer 2

Image Analyst 2016-4-26

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编辑：Image Analyst 2016-4-26

Maybe this:

http://www.mathworks.com/matlabcentral/fileexchange/29485-meshcanopy

Or maybe this: http://www.mathworks.com/matlabcentral/fileexchange/5726-colored-area-on-a-curved-surface

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I am using a colour image to create a 3-d plot of pixel intensity. I have to turn it gray for the project to work, but I would like to know how to make the 3-d plot of pixel intensity, on the original without changing its colour.

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I am using a colour image to create a 3-d plot of pixel intensity. I have to turn it gray for the project to work, but I would like to know how to make the 3-d plot of pixel intensity, on the original without changing its colour.

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