How do I count the number of features detected through MSER?

Asked Jun 24 '20 at 15:02

Active Jun 24 '20 at 15:07

Viewed 47 times

I am trying to count the number of features detected by MSER feature detection algorithm in OPenCV Python. I have no idea how to do that. I would greatly appreciate it if someone helped me figure out the code. Below is the code I used for MSER.

import cv2 as cv
mser = cv.MSER_create()
img = cv.imread('image.jpg')
half = cv.resize(img, (1200, 800), fx=0.1, fy=0.1)
gray = cv.cvtColor(half, cv.COLOR_BGR2GRAY)
vis = half.copy()
regions, _ = mser.detectRegions(gray)
hulls = [cv.convexHull(p.reshape(-1, 1, 2)) for p in regions]
cv.polylines(vis, hulls, 1, (0, 255, 0))
cv.imshow('img', vis)
cv.waitKey(0)
cv.destroyAllWindows()

Result:

edited Jun 24 '20 at 15:07

mkrieger1

19,194
5
54
65

asked Jun 24 '20 at 15:02

Ririe Sakamaki

Just a guess: `len(regions)` or `len(hulls)`? – mkrieger1 Jun 24 '20 at 15:07
yes! Thank you so much! – Ririe Sakamaki Jun 24 '20 at 15:11
I'm voting to close as duplicate of [How do I get the number of elements in a list?](https://stackoverflow.com/questions/1712227/how-do-i-get-the-number-of-elements-in-a-list) – mkrieger1 Jun 24 '20 at 15:11
yes. it does now – Ririe Sakamaki Jun 24 '20 at 15:12

How do I count the number of features detected through MSER?

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