problem with image registration using BRISK

i am using BRISK to extract feature from remote sensing images but the extracted feature are not right

the code used is as follows:

original1 = imread('im1.tif');

ptsOriginalBRISK1 = detectBRISKFeatures(original1,'MinContrast',0.01,'MinQuality',0.7);

[featuresO1,validPtsO1] = extractFeatures(original1,ptsOriginalBRISK1);

distorted1 = imread('im2.tif');

ptsDistortedBRISK1 = detectBRISKFeatures(distorted1,'MinContrast',0.01,'MinQuality',0.7);

[featuresD1,validPtsD1] = extractFeatures(distorted1,ptsDistortedBRISK1);

Pairs11 = matchFeatures(featuresO1,featuresD1,'MatchThreshold',90,'MaxRatio',0.9);

matchedO = validPtsO1(Pairs11(:,1));

matchedD = validPtsD1(Pairs11(:,2));

[tform, inlierDistorted,inlierOriginal] = estimateGeometricTransform(matchedD,matchedO,'similarity');

figure

showMatchedFeatures(original1,distorted1,inlierOriginal,inlierDistorted,'montage')

title('Matching points (inliers only)')

legend('im1','im2')

[Image Analyst]

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Answer 1

[Udit06]

Hi Asmaa,

You can try to reduce the MetricThreshold parameter of the detectSURFFeatures function. Reducing the value of MetricThreshold parameter increases the number of blobs which may in turn increase the number of features.

Refer to the Name-Value arguments section of the following documentation for more details:

https://www.mathworks.com/help/vision/ref/detectsurffeatures.html

I hope this helps.

[asmaa elyamany]

thank you for your answer i have updated my question, would you take a look on it?

thanks in advance