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How to ensure that the number of matches between 2 images is equal to the number given?

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Animesh Shankar
Animesh Shankar on 19 Nov 2020
Edited: Animesh Shankar on 20 Nov 2020
Using the matching features from here:
I1 = rgb2gray(imread('viprectification_deskLeft.png'));
I2 = rgb2gray(imread('viprectification_deskRight.png'));
points1 = detectHarrisFeatures(I1);
points2 = detectHarrisFeatures(I2);
[features1,valid_points1] = extractFeatures(I1,points1);
[features2,valid_points2] = extractFeatures(I2,points2);
indexPairs = matchFeatures(features1,features2);
matchedPoints1 = valid_points1(indexPairs(:,1),:);
matchedPoints2 = valid_points2(indexPairs(:,2),:);
figure; showMatchedFeatures(I1,I2,matchedPoints1,matchedPoints2);
How do I ensure that the number of matches found is equal to a number given e.g. 170?
If not, then how can I ensure that for every point in valid_points1 there is a corresponding point in valid_points2.
So if valid_points1 is 170 points in total, then indexPairs should also be 170 points.

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