Feature extraction surf, storing points
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I have some number of images that contains faces. First, I am collecting features from all images and need to store features for further purposes. What is the best way to store features? Later, I am gonna use them to match input images to detect face.
face = rgb2gray(imread('...'));
facePoints = detectSURFFeatures(face);
features = selectStrongest(facePoints, 100);
回答（1 个）
Turlough Hughes
2019-10-20
编辑：Turlough Hughes
2019-10-20
One way is to store as a struct, for example
s(ii).features=features; %where ii would be incrementing as you iterate through each image (i.e. for loop)
You can access the features of a given image afterwards as:
features=s(ii).features;
This way of storing your data will be particularly useful if you have other information you wish you wish to store that relates to each image such as:
s(ii).ImageName=ImName;
s(ii).folder=folder;
s(ii).otherdata=otherdata;
If you are not very familiar with structures I recomend reading the following documentation and working through some of the examples.
5 个评论
Ömer Faruk Kurular
2019-10-20
Image Analyst
2019-10-20
Do you mean like to disk in a .mat file by using the save() function?
Ömer Faruk Kurular
2019-10-21
Ömer Faruk Kurular
2019-10-21
编辑：Ömer Faruk Kurular
2019-10-21
Turlough Hughes
2019-10-21
Ah ok, you can save the struct as follows:
for ii=1:n_imgs
%load image
features= %etc
s(ii).features=features;
end
save('s.mat','s')
this will save the struct in your working directory as a file called s.mat.
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2019-10-20
2019-10-21
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