matlab在图像中画长方形(框)
function [state,result]=draw_rect(data,pointAll,windSize,showOrNot)
% 函数调用:[state,result]=draw_rect(data,pointAll,windSize,showOrNot)
% 函数功能:在图像画个长方形框
% 函数输入:data为原始的大图,可为灰度图,可为彩色图
% pointAll 框的左上角在大图中的坐标(每行代表一个坐标),
% 注意:在图中的坐标系为第一列为y,第二列为x(很奇怪的)
% windSize 框的大小 windSize=[112,92] 分别表示长宽
% showOrNot 是否要显示,默认为显示出来
% 函数输出:state -- 表示程序结果状态
% result - 结果图像数据
% 函数历史: v0.0 @2013-01-27 created by Aborn
if nargin < 4
showOrNot = 1;
end
rgb = [255 255 0]; % 边框颜色
lineSize = 3; % 边框大小,取1,2,3
windSize(1,1)=windSize(1,1);
windSize(1,2) = windSize(1,2);
if windSize(1,1) > size(data,1) ||...
windSize(1,2) > size(data,2)
state = -1; % 说明窗口太大,图像太小,没必要获取
disp('the window size is larger then image...');
return;
end
result = data;
if size(data,3) == 3
for k=1:3
for i=1:size(pointAll,1) %画边框顺序为:上右下左的原则
result(pointAll(i,1),pointAll(i,2):pointAll(i,2)+windSize(i,1),k) = rgb(1,k);
result(pointAll(i,1):pointAll(i,1)+windSize(i,2),pointAll(i,2)+windSize(i,1),k) = rgb(1,k);
result(pointAll(i,1)+windSize(i,2),pointAll(i,2):pointAll(i,2)+windSize(i,1),k) = rgb(1,k);
result(pointAll(i,1):pointAll(i,1)+windSize(i,2),pointAll(i,2),k) = rgb(1,k);
if lineSize == 2 || lineSize == 3
result(pointAll(i,1)+1,pointAll(i,2):pointAll(i,2)+windSize(i,1),k) = rgb(1,k);
result(pointAll(i,1):pointAll(i,1)+windSize(i,2),pointAll(i,2)+windSize(i,1)-1,k) = rgb(1,k);
result(pointAll(i,1)+windSize(i,2)-1,pointAll(i,2):pointAll(i,2)+windSize(i,1),k) = rgb(1,k);
result(pointAll(i,1):pointAll(i,1)+windSize(i,2),pointAll(i,2)-1,k) = rgb(1,k);
if lineSize == 3
result(pointAll(i,1)-1,pointAll(i,2):pointAll(i,2)+windSize(i,1),k) = rgb(1,k);
result(pointAll(i,1):pointAll(i,1)+windSize(i,2),pointAll(i,2)+windSize(i,1)+1,k) = rgb(1,k);
result(pointAll(i,1)+windSize(i,2)+1,pointAll(i,2):pointAll(i,2)+windSize(i,1),k) = rgb(1,k);
result(pointAll(i,1):pointAll(i,1)+windSize(i,2),pointAll(i,2)+1,k) = rgb(1,k);
end
end
end
end
end
state = 1;
if showOrNot == 1
figure;
imshow(result);
end
在main函数中调用如下:
% main.m
clc;
clear;
close all;
data = imread('man_1.jpg');
pointAll = [5,20];
windSize = [100,30];
[state,results]=draw_rect(data,pointAll,windSize);
return;
原图像为:
结果图像为:
特别注意:图像中显示的坐标系和我们平时用的不一样!!!