How can I detect the SURF features of 400 images? (I want the code)

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lebed toufik 2022-2-19

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评论： lebed toufik 2022-2-22

采纳的回答： yanqi liu

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Hello, can you please help me detect the SURF features of 400 images and stock them in a matrix [?? 400] or [400 ??]?

My code is

clear all, clc, close all;
a=dir('C:\Users\toufik\Desktop\database\ORL\*.jpg');
n= length(a);
for i=1:n
filename=strcat('C:\Users\toufik\Desktop\database\ORL\',a(i).name);
    I=imread(filename);
    points = detectSURFFeatures(I);
    [features, valid_points] = extractFeatures(I, points);
end

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lebed toufik 2022-2-19

@Walter Roberson same problem.

Walter Roberson 2022-2-20

在 MATLAB Online 中打开

a = dir('C:\Users\toufik\Desktop\database\ORL\*.jpg');
n = length(a);
for i=1:n
    filename = strcat('C:\Users\toufik\Desktop\database\ORL\',a(i).name);
    I = imread(filename);
    points = detectSURFFeatures(I);
    [features{i}, valid_points{i}] = extractFeatures(I, points);
end

Note that each of the features will be a 2D array; you could reshape that to a row or column if needed.

Note that the number of points detected will depend upon the content of the image, so the features array may be a different size for each input file, even if the input files are all the same size (which is something your code does not promise.)

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采纳的回答

yanqi liu 2022-2-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1653575-how-can-i-detect-the-surf-features-of-400-images-i-want-the-code#answer_900775

在 MATLAB Online 中打开

yes，sir，may be you want use surf to classify orl databse，or search image by surf points，so we can use bagOfFeatures to get it，such as

a=dir('C:\Users\toufik\Desktop\database\ORL\*.jpg');
ab = imageSet('C:\Users\toufik\Desktop\database\ORL','recursive');
bag = bagOfFeatures(ab,'Verbose',false);
% get surf feature vector
img = imread(strcat('C:\Users\toufik\Desktop\database\ORL\',a(1).name););
featureVector = encode(bag,img);

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yanqi liu 2022-2-22

yes，sir，may be different image have different surf points number，so the description feature vector may be not the same size，so we can use vision code dictionary to make them same size or choose same number surf points to get same size

lebed toufik 2022-2-22