Exercise

Measure variance

SciPy measurement functions allow you to tailor measurements to specific sets of pixels:

Specifying labels restricts the mask to non-zero pixels.
Specifying index value(s) returns a measure for each label value.

For this exercise, calculate the intensity variance of vol with respect to different pixel sets. We have provided the 3D segmented image as labels: label 1 is the left ventricle and label 2 is a circular sample of tissue.

Labeled Volume

After printing the variances, select the true statement from the answers below.

Instructions 1/2

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Using vol and labels arrays, measure the variance of pixel intensities in the specified sets of pixels. Print them to the screen.