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arcLength function (without OpenCv)

I'm trying to avoid CV2 for work porpuses. I'm using skimage.measure.find_contours. But I couldn't find the CV2 arcLength function equivalent anywhere.

How could I calculate a contour perimeter or a curve length without that CV2 function.

It's my code, just in case:

from skimage import measure

hresh = get_threshold(image, 127)
contours = measure.find_contours(thresh, 0.8)

for contour in contours:
approx = aproximate_curve(contour, 0.1 * my_unknown_arc_length_function(contour)) # I have no idea about arc_length_function implementation


Thanks in advance and sorry about my English.

1 Answer
1

In OpenCV the arcLength() function is used to find the perimeter of a contour/shape object. It can be found here

arcLength()

In scikit image the same function can be found in the measure module named perimeter.

measure

perimeter

Usage:

#--- importing the module ---
from skimage.measure import perimeter

print('Perimeter : '.format(perimeter(image)))


Make sure the image is of float data type. The pixels containing the contour/shape object must be of value 1.0 while the other pixels are of 0.0.

float

1.0

0.0

A lot is discussed about this function on this link

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