MATLAB: How to grow original shape

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Make sure that floor(st2.EquivDiameter/2) is equal to 10.

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MATLAB: How to get region of interest and calculate the hit rate and precision rate

Calculate the area of the elephant from the outline you traced around it using poly2mask, then sum.

elephantMask = poly2mask(x, y, rows, columns);
elephantArea = sum(elephantMask(:));

Then calculate the area of overlap between your segmentation and the true area

numSegmentationPixels = sum(segmentationMask(:))
overlapPixels = elephantMask & segmentationMask;
numOverlapPixels = sum(overlapPixels(:))

Then use your formula for precison:

precision = numOverlapPixels / numSegmentationPixels;

MATLAB: How to crop image with nonlinear cropping shape

Get the horizontal and vertical profiles using sum(), and get the top and bottom row and left and right column using find()

horizontalProfile = sum(binaryImage, 1);
verticalProfile = sum(binaryImage, 2);
topRow = find(verticalProfile, 1, 'first');
bottomRow = find(verticalProfile, 1, 'last');
leftColumn= find(horizontalProfile, 1, 'first');
rightColumn = find(horizontalProfile, 1, 'last');
croppedImage = binaryImage(topRow:bottomRow, leftColumn:rightColumn);

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Related Solutions

MATLAB: How to get region of interest and calculate the hit rate and precision rate

MATLAB: How to crop image with nonlinear cropping shape

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