Question

怎么用matlab找图像的重心

怎么用matlab对图像重心的定位？谁有这方面的编程能发一下吗？谢谢了。

Answer 1

用matlab找图像的重心可以参考以下的代码：

I = imread('1.jpg');

I = rgb2gray(I);

imshow(I);

I = double(I);

[rows,cols] = size(I); 

x = ones(rows,1)*[1:cols];y = [1:rows]'*ones(1,cols);   

area = sum(sum(I)); 

meanx = sum(sum(I.*x))/area; 

meany = sum(sum(I.*y))/area;

hold on;

plot(meanx,meany,'r+'); %十字标出重心位置

扩展资料：

常用函数

fix(x)：无论正负，舍去小数至相邻整数

floor(x)：下取整，即舍去正小数至相邻整数

ceil(x)：上取整，即加入正小数至相邻整数

rat(x)：将实数x化为多项分数展开

plot: x轴和y轴均为线性刻度（Linear scale）

loglog: x轴和y轴均为对数刻度（Logarithmic scale）

semilogx: x轴为对数刻度，y轴为线性刻度

semilogy: x轴为线性刻度，y轴为对数刻度

sin(x)：正弦函数

cos(x)：余弦函数

tan(x)：正切函数

asin(x)：反正弦函数

cosh(x)：双曲余弦函数

tanh(x)：双曲正切函数    

参考资料来源：百度百科-MATLAB

Answer 2

计算重心公式: 

与物理学概念的重心类似,只是P代表像素值

I = imread('1.jpg');
I = rgb2gray(I);
imshow(I);
I = double(I);
[rows,cols] = size(I); 
x = ones(rows,1)*[1:cols];
y = [1:rows]'*ones(1,cols);   
area = sum(sum(I)); 
meanx = sum(sum(I.*x))/area; 
meany = sum(sum(I.*y))/area;
hold on;
plot(meanx,meany,'r+'); %十字标出重心位置

Answer 3

转发Fahd A. Abbasi.写的程序

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Function Developed by Fahd A. Abbasi.
% Department of Electrical and Electronics Engineering, University of
% Engineering and Technology, Taxila, PAKISTAN.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Function takes a picture as an argument (suitably should contain only one
% object whose centroid is to be obtained) and returns the x and y
% coordinates of its centroid.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% USAGE (SAMPLE CODE)
%
% pic = imread('ic.tif');
% [x,y] = ait_centroid(pic);
% x
% y
% imshow(pic); pixval on
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function [meanx,meany] = ait_centroid(pic)

[x,y,z] = size(pic); % Checking whether the picture is colored or monochromatic, if colored then converting to gray.
if(z==1)
;
else
pic = rgb2gray(pic);
end

im = pic;
[rows,cols] = size(im);
x = ones(rows,1)*[1:cols]; % Matrix with each pixel set to its x coordinate
y = [1:rows]'*ones(1,cols); % " " " " " " " y "

area = sum(sum(im));
meanx = sum(sum(double(im).*x))/area;
meany = sum(sum(double(im).*y))/area;

Answer 4

求矩统计量。