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Contour.py
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Contour.py
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import numpy as np
import cv2
import utils
class Contour(object):
THRESHOLD = 200
def __init__(self, points, color, centroid_x, centroid_y, area, perimeter):
self.points = points
self.color = color
self.centroid_x = centroid_x
self.centroid_y = centroid_y
self.area = area
self.perimeter = perimeter
def __str__(self):
return """
color: %s
centroid: (%s, %s)
area: %s
perimeter: %s
""" % (self.color, self.centroid_x, self.centroid_y, self.area, self.perimeter)
@classmethod
def find_contours(cls, image, threshold=THRESHOLD):
image_gray = utils.BGR_to_gray(image)
ret, thresh = cv2.threshold(image_gray, threshold, 255, 0)
base_contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE,
cv2.CHAIN_APPROX_SIMPLE)
# base_contours = [utils.approx_contour(cnt) for cnt in base_contours]
contours = []
for contour in base_contours:
area = cv2.contourArea(contour)
mask = utils.mask_from_contour_points(image, contour)
color = cv2.mean(image, mask=mask)
perimeter = cv2.arcLength(contour, True)
M = cv2.moments(contour)
try:
centroid_x = int(M['m10']/M['m00'])
centroid_y = int(M['m01']/M['m00'])
contours.append(Contour(contour, color, centroid_x, centroid_y, area, perimeter))
except ZeroDivisionError:
pass
return contours
@classmethod
def draw_outlines(cls, contours, image, color=None, thickness=3):
for contour in contours:
contour.draw_outline(image, color, thickness)
@classmethod
def draw_fills(cls, contours, image, color=None):
for contour in contours:
contour.draw_fill(image, color)
@classmethod
def remove_frame(cls, contours):
max_contour = contours[0]
for contour in contours:
max_contour = contour if contour.area > max_contour.area else max_contour
return [c for c in contours if c != max_contour]
@classmethod
def without_small_contours(cls, contours, min_size):
return [c for c in contours if c.area > min_size ]
def draw_outline(self, image, color=None, thickness=3):
color = color if color else self.color
cv2.drawContours(image, [self.points], 0, color, thickness)
return image
def draw_fill(self, image, color=None):
return self.draw_outline(image, color, -1)