how extract Features at specific regions??

Question

hajer jon 2019-10-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487954-how-extract-features-at-specific-regions

回答： Subhadeep Koley 2019-11-1

Hi

i tray to extract features to detect people but it got more than one points each person i tray to use imgradientimgradient to get edge of each persons but how??

i need help

[Gx,Gy] = imgradientxy(imca);

[Gmag, Gdir] = imgradient(imca,'central');

%Gmag_normalized = Gmag / 8;

%figure

% imshow(Gmag_normalized );

%F = fft(Gmag);figure;imshow(F),title('fft');%%%%%or use imgradient

figure,imshowpair(Gmag, Gdir, 'montage');

[reg1,dd] = detectMSERFeatures(imca,'RegionAreaRange',[3 ,3]);

%[reg1,dd] = detectMSERFeatures(rgb2gray(I),'RegionAreaRange' ,[3 3]);

[features2, valid_point] = extractFeatures(rgb2gray(I),reg1);

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Answer 1

Subhadeep Koley 2019-11-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487954-how-extract-features-at-specific-regions#answer_399331

在 MATLAB Online 中打开

people1.jpg

It is very difficult to extract only one MSER feature per person in your image. But tweaking the parameters

'RegionAreaRange', and 'ThresholdDelta' you can get very close. Refer to the example below.

I = imread('people1.jpg');
I = rgb2gray(I);
regions = detectMSERFeatures(I,'RegionAreaRange',[3 3],'ThresholdDelta',2);
figure; imshow(I); 
hold on;
plot(regions,'showEllipses',false);
[features2, valid_point] = extractFeatures(I,regions);