str2num for looping through images

Question

Anand 2014-8-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152017-str2num-for-looping-through-images

评论： Image Analyst 2014-8-22

Hi Everyone! I'm trying to have a for loop that will cycle through multiple images. Take my trainer pic for example. There are 3 pictures. Instead of reading the file 3 times, can someone help?

Keep in mind the following

trainer1.png,trainer2.png, and trainer3.png are 3 different pictures
trainerPic is the axes in which it will be displayed

Here's what I have:

[handles.v1,handles.b,handles.a1] = imread('trainer1.png');
[handles.v2,handles.b,handles.a2] = imread('trainer2.png');
[handles.v3,handles.b,handles.a3] = imread('trainer3.png');
i=true
while(i==true)
% trainer sequence
  axes(handles.trainerPic)
    handles.V = imshow(handles.v1)
    set(handles.V,'AlphaData',handles.a1)
    pause(0.3)
    handles.V = imshow(handles.v2)
    set(handles.V,'AlphaData',handles.a2)
    pause(0.3)
    handles.V = imshow(handles.v3)
    set(handles.V,'AlphaData',handles.a3)
end

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Answer 1

Image Analyst 2014-8-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152017-str2num-for-looping-through-images#answer_149577

What is handles.a1, a2, and a3? Where did you see that imread() returns 3 outputs? What do you think the third output is supposed to be? I've never used more than 2 outputs and don't see anything in the help about 3 outputs.

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Anand 2014-8-22

Sorry for the missing details. The while loop works and the 3 images are displayed. I'm just not sure how to use str2num for the trainer 1 .png to trainer 2 .png to trainer*3*.png and forward

Don't worry about the other details. They work :)

Image Analyst 2014-8-22

I'm really not sure what you want to do and why you have a loop. Do you want to show images #2 and 3 in the overlay (alpha channel) above image #1? Or maybe you want to process a sequence of images, like the FAQ shows you http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F Let us know if we can help further (after you explain better).

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