在matlab中跟蹤圖像

Question

你如何在你正在跟蹤的圖像上放置一個藍色圓圈？不是一個圈子，但更像一個甜甜圈。

Answer 1

例如像這樣：

%# load image and display it 
img = imread('autumn.tif'); 
figure,imshow(img); 

%# make it such that plotting something doesn't erase 
%# the previous plot (i.e. the image) 
hold on 

%# plot a circle. MarkerSize controls the size of the circle 
plot(200,100,'ob','MarkerSize',14) 

Answer 2

下面是你的另一個問題基於Jonas' answer一個例子：

%# sample image 
I = imread('autumn.tif'); 
figure, imshow(I) 

%# location of random feature points 
featLoc = randi([1 200], [10 2]); 

%# draw first 5 points as one set, the rest as another with a different color 
lineProps = {'LineStyle','none', 'LineWidth',2, 'Marker','o', 'MarkerSize',10}; 
line(featLoc(1:5,1), featLoc(1:5,2), 'Color','r', lineProps{:}) 
line(featLoc(6:end,1), featLoc(6:end,2), 'Color','b', lineProps{:})