Hi,
MSER is based on taking regions that stay same for wide range of thresholds. It basically extracts co-variant regions from an image. In the particular example of Find features using MSER with SURF feature descriptor.
%Extracts the regions that stay same in the image.
regions = detectMSERFeatures(I);
%Extracts the surf features from the regions that are obtained from the detectMSERFeatures function.
[features, valid_points] = extractFeatures(I,regions,'Upright',true);
MSER gives the regions that are distributed over the entire image. Describing the SURF features over these regions will aid in the feature tracking.
