Keep SURF features from many images

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Erysham
Erysham 2016-9-6
评论： Erysham 2016-9-7
Hello everybody,
Currently I wanted to extract SURF feature, let say from bunch of images stored in one folder. I run the following code, I managed to get the feature from the last image only. How can we keep the features for all images we extracted?
Thanks.
srcFiles = dir('D:\Phd Study\Matlab Food\fooddemo\try\*.jpg'); % the folder in which ur images exists
for i = 1 : length(srcFiles)
filename = strcat('D:\Phd Study\Matlab Food\fooddemo\try\',srcFiles(i).name);
I = imread(filename);
a=rgb2gray(I);
points = detectSURFFeatures(a);
[features, valid_points] = extractFeatures(a, points);
end
figure; imshow(I); hold on;
plot(valid_points.selectStrongest(10),'showOrientation',true);

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Thorsten
Thorsten 2016-9-6
The most general form is
[features{i}, valid_points{i}] = extractFeatures(a, points);
if features is just a single number, you can use
[features(i), ...
if features is always a column vector of the same length, you can use
[features(:,i), ...
if features is always a row vector of the same length, you can use
[features(i,:), ...
if features is always a matrix of same size, you can use
[features(:,:,i)
and so on, same for valid_points, of course.
In this case it is efficient to pre-allocate the feature, like
feature = zeros(1, length(srcFiles))
or using
features(1, length(srcFiles)) = 0;

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