MATLAB - 如何在图像上绘制 x,y 并保存?
文件 datafile.txt
code x y
23 22.1 33.11
23 110 22
23 11 200
24 111 321
24 222 111
24 10 22.1
10 88.3 99.3
10 110 32
10 121 143
10 190 200
在上面的文件中,第一列代表屏幕上显示的图像代码,x 和 y 列代表人们在图像上观看的点。向用户显示了三个不同的图像。下面代码的问题是我不知道如何使用打开的文件名保存绘制 xy 的图像。
fid = fopen(datafile.txt);
A = textscan(fid,'%f%f%f'); %Read data from the file
code = A{1};
xfix = A{2};
yfix = A{3};
for k=1:length(code)
imagefile=code(k)
I = imread([num2str(imagefile) '.jpg']); %# Load a sample image
imshow(I); %# Display it
[r,c,d] = size(I) %# Get the image size
set(gca,'Units','normalized','Position',[0 0 1 1]); %# Modify axes size
set(gcf,'Units','pixels','Position',[200 200 c r]); %# Modify figure size
hold on;
x = xfix2(k);
y = yfix2(k);
plot(x,y,'+ b');
f = getframe(gcf); %# Capture the current window
imwrite(f.cdata,([num2str(imagefile) '.jpg'])); %# Save the frame data
hold off
end
但是,我有一个小问题。我覆盖在图像上的“交叉图”被灰色阴影包围(就像当我们复印一张纸时,它们在上面将是灰色的)。这是怎么发生的?
File datafile.txt
code x y
23 22.1 33.11
23 110 22
23 11 200
24 111 321
24 222 111
24 10 22.1
10 88.3 99.3
10 110 32
10 121 143
10 190 200
In the above file, the first column represents the image code which is displayed on the screen, and the x and y columns represent the point where people look on the image. There were three different images displayed to the user. The problem with the code below is that I don't know how to save the image with the plotted x-y on with the same name of file as it opened.
fid = fopen(datafile.txt);
A = textscan(fid,'%f%f%f'); %Read data from the file
code = A{1};
xfix = A{2};
yfix = A{3};
for k=1:length(code)
imagefile=code(k)
I = imread([num2str(imagefile) '.jpg']); %# Load a sample image
imshow(I); %# Display it
[r,c,d] = size(I) %# Get the image size
set(gca,'Units','normalized','Position',[0 0 1 1]); %# Modify axes size
set(gcf,'Units','pixels','Position',[200 200 c r]); %# Modify figure size
hold on;
x = xfix2(k);
y = yfix2(k);
plot(x,y,'+ b');
f = getframe(gcf); %# Capture the current window
imwrite(f.cdata,([num2str(imagefile) '.jpg'])); %# Save the frame data
hold off
end
However, I have a little problem. The "cross plots" which I overlay on the image, were surrounded by gray shadow (like when we photocopy a paper, they will be a gray color on it). How did this happen?
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有多种方法:
叠加线图像上的绘图
我可以使用 JPEG 文件作为 MATLAB 绘图中的背景吗?
如何向 GUI 或图形窗口添加背景图像?
而且之后调整轴时总会出现某种问题。
There are numerous ways:
Superimposing line plots on images
Can I use a JPEG file as a background in a MATLAB plot?
How do I add a background image to my GUI or figure window?
And there's always some kind of problem with adjusting the axes afterwards.