def test_detect_englobing_polygon_error():
array = np.ones(shape=(200, 200, 3), dtype='uint8') * 250
try:
points = detect_englobing_polygon(array)
assert False, 'Detected points while no polygon in the image'
except LookupError:
pass
def test_detect_englobing_polygon_simple():
array = np.ones(shape=(5000, 5000, 3), dtype='uint8') * 250
array[200:1800, 200:2800, :] = 0
points = detect_englobing_polygon(array)
assert len(points) == 4
points = [tuple(*el) for el in points]
assert (200, 200) in points
assert (200, 1790) in points
assert (2790, 200) in points
assert (2790, 1790) in points
def test_detect_englobing_polygon_photo():
array = _image('sheet.jpg')
points = detect_englobing_polygon(array).astype(int)
assert len(points) == 4
area = cv2.contourArea(points)
points = [(p[0, 0], p[0, 1]) for p in points]
h, w = get_target_rectangle_size(points)
assert h * w > (array.shape[0] * array.shape[1])* 1 / 3
assert w > array.shape[0]/2
assert h > array.shape[1]/2
assert h * w > area
def main():
# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("image", help="path to the image file")
args = ap.parse_args()
image = cv2.imread(args.image)
image = resize(image, width=2000)
pts = detect_englobing_polygon(image)
pts = [tuple(*el) for el in pts]
warped = process(image, pts)
pts = np.array(pts, np.int32)
pts = pts.reshape((-1,1,2))
image = cv2.polylines(image,[pts],True,(0,255,255), 10)
cv2.imshow("Original", resize(image, width=1000))
cv2.imshow("Warped", resize(warped, width=1000))
cv2.waitKey(0)