Extract polygons by color from mask image

Asked May 15 '19 at 02:11

Active May 15 '19 at 02:11

Viewed 1,278 times

I would like to extract the Polygon Shape by color, if it's possible the corner coordinates,

Currently i'm trying with open-cv find contourns, but it's very precise i'm getting a lot of coordinates. what i want it's just the corner points to make the polygon by color.

img = cv2.imread('mask_ZT76_39_A_2_8.png', 0)
img = cv2.medianBlur(img, 5)
thresh =     cv2.adaptiveThreshold(img,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,\
cv2.THRESH_BINARY,11,2)

image, contours, hierarchy = cv2.findContours(thresh.copy(),cv2.RETR_LIST,cv2.CHAIN_APPROX_SIMPLE)

cv2.drawContours(image, contours, -1, (0,255,0), 3)

approx_=[]

for i in range(len(contours[0])):
  epsilon = cv2.arcLength(contours[0][i],True)
  approx = cv2.approxPolyDP(contours[0][i],epsilon,True)

Thanks.

asked May 15 '19 at 02:11

ambigus9

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Possible duplicate of [how to find corners points of a shape in an image in opencv?](https://stackoverflow.com/questions/50984205/how-to-find-corners-points-of-a-shape-in-an-image-in-opencv) – zindarod May 15 '19 at 04:30
I tried with that solution. but it's just getting very few points. – ambigus9 May 15 '19 at 13:58
Did you find any solution? – Abu Noman Md Sakib Jun 16 '20 at 16:11
1

@anms_pro sure, maybe will help you `Measure region properties` https://scikit-image.org/docs/stable/auto_examples/segmentation/plot_regionprops.html – ambigus9 Jun 16 '20 at 18:31

Extract polygons by color from mask image

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