error :subscripted assignment dimension mismatch when use extractSURFFeature?
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when i extract surf or fast feature , i have error but when i used extractHOGFeatures i do not have error
for i = 1:numel(trainingSet.Files)
I = readimage(trainingSet, i);
I=imresize(I,[1024 1024]);
I = rgb2gray(I);
train=detectSURFFeatures(I);
[trainfeatures(i,:), trainpoints(i,:)]= extractFeatures(I,train.selectStrongest(10));
end
Error: subscripted assignment dimension mismatch
how can i use extractSURFFeatures and detectBRISKFeatures instead of extractHOGFeatures
采纳的回答
Walter Roberson
2017-2-1
0 个投票
For SURF:
"M-by-N matrix | binaryFeatures object
Feature vectors, returned as a binaryFeatures object or an M-by-N matrix of M feature vectors, also known as descriptors. Each descriptor is of length N."
For HOG:
"features = extractHOGFeatures(I) returns extracted HOG features from a truecolor or grayscale input image, I. The features are returned in a 1-by-N vector, where N is the HOG feature length"
Notice that HOG returns a vector, but SURF returns a 2D array.
You could assign the SURF features to a variable and reshape that to a vector for storing.
2 个评论
samar mahmoud
2017-2-1
编辑：Walter Roberson
2017-2-1
Walter Roberson
2017-2-1
[these_trainfeatures, these_trainpoints] = extractFeatures(I,train.selectStrongest(10));
trainfeatures(i,:) = these_trainfeatures(:);
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