webcam.py

# USAGE
# python webcam.py --webcam 1 --cm 2.0

# import the necessary packages
from scipy.spatial import distance as dist
from imutils import perspective
from imutils import contours
import numpy as np
import argparse
import imutils
import cv2

def midpoint(ptA, ptB):
	return ((ptA[0] + ptB[0]) * 0.5, (ptA[1] + ptB[1]) * 0.5)

# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-w", "--webcam", type=int, default=0,
	help="webcam source id")
ap.add_argument("-c", "--cm", type=float, required=True,
	help="width of the left-most object in the image (in cm)")
args = vars(ap.parse_args())

video_source = args["webcam"]

video_capture = cv2.VideoCapture(video_source)

while True:
	ret, frame = video_capture.read()

	image = frame

	gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
	gray = cv2.GaussianBlur(gray, (7, 7), 0)

	# perform edge detection, then perform a dilation + erosion to
	# close gaps in between object edges
	edged = cv2.Canny(gray, 50, 100)
	edged = cv2.dilate(edged, None, iterations=1)
	edged = cv2.erode(edged, None, iterations=1)

	# find contours in the edge map
	cnts = cv2.findContours(edged.copy(), cv2.RETR_EXTERNAL,
		cv2.CHAIN_APPROX_SIMPLE)
	cnts = imutils.grab_contours(cnts)

	# sort the contours from left-to-right and initialize the
	# 'pixels per metric' calibration variable
	(cnts, _) = contours.sort_contours(cnts)
	pixelsPerMetric = None

	# loop over the contours individually
	for c in cnts:
		# if the contour is not sufficiently large, ignore it
		if cv2.contourArea(c) < 100:
			continue

		# compute the rotated bounding box of the contour
		# orig = image.copy()
		orig = image
		box = cv2.minAreaRect(c)
		box = cv2.cv.BoxPoints(box) if imutils.is_cv2() else cv2.boxPoints(box)
		box = np.array(box, dtype="int")

		# order the points in the contour such that they appear
		# in top-left, top-right, bottom-right, and bottom-left
		# order, then draw the outline of the rotated bounding
		# box
		box = perspective.order_points(box)
		cv2.drawContours(orig, [box.astype("int")], -1, (0, 255, 0), 2)

		# loop over the original points and draw them
		for (x, y) in box:
			cv2.circle(orig, (int(x), int(y)), 5, (0, 0, 255), -1)

		# unpack the ordered bounding box, then compute the midpoint
		# between the top-left and top-right coordinates, followed by
		# the midpoint between bottom-left and bottom-right coordinates
		(tl, tr, br, bl) = box
		(tltrX, tltrY) = midpoint(tl, tr)
		(blbrX, blbrY) = midpoint(bl, br)

		# compute the midpoint between the top-left and top-right points,
		# followed by the midpoint between the top-righ and bottom-right
		(tlblX, tlblY) = midpoint(tl, bl)
		(trbrX, trbrY) = midpoint(tr, br)

		# draw the midpoints on the image
		cv2.circle(orig, (int(tltrX), int(tltrY)), 5, (255, 0, 0), -1)
		cv2.circle(orig, (int(blbrX), int(blbrY)), 5, (255, 0, 0), -1)
		cv2.circle(orig, (int(tlblX), int(tlblY)), 5, (255, 0, 0), -1)
		cv2.circle(orig, (int(trbrX), int(trbrY)), 5, (255, 0, 0), -1)

		# draw lines between the midpoints
		cv2.line(orig, (int(tltrX), int(tltrY)), (int(blbrX), int(blbrY)),
			(255, 0, 255), 2)
		cv2.line(orig, (int(tlblX), int(tlblY)), (int(trbrX), int(trbrY)),
			(255, 0, 255), 2)

		# compute the Euclidean distance between the midpoints
		dA = dist.euclidean((tltrX, tltrY), (blbrX, blbrY))
		dB = dist.euclidean((tlblX, tlblY), (trbrX, trbrY))

		# if the pixels per metric has not been initialized, then
		# compute it as the ratio of pixels to supplied metric
		# (in this case, inches)
		if pixelsPerMetric is None:
			pixelsPerMetric = dB / args["cm"]

		# compute the size of the object
		dimA = dA / pixelsPerMetric
		dimB = dB / pixelsPerMetric

		# draw the object sizes on the image
		cv2.putText(orig, "{:.1f}cm".format(dimA),
			(int(tltrX - 15), int(tltrY - 10)), cv2.FONT_HERSHEY_SIMPLEX,
			0.65, (255, 255, 255), 2)
		cv2.putText(orig, "{:.1f}cm".format(dimB),
			(int(trbrX + 10), int(trbrY)), cv2.FONT_HERSHEY_SIMPLEX,
			0.65, (255, 255, 255), 2)

	# show the output image
	cv2.imshow("Image", orig)

	if cv2.waitKey(1) & 0xFF == ord('q'):
		break

# Release handle to the webcam
video_capture.release()
cv2.destroyAllWindows()