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bfeeed7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | import numpy as np
import cv2
def make_coordinate_grid(image_size):
h, w = image_size
x = np.arange(w)
y = np.arange(h)
x = (2 * (x / (w - 1)) - 1)
y = (2 * (y / (h - 1)) - 1)
xx = x.reshape(1, -1).repeat(h, axis=0)
yy = y.reshape(-1, 1).repeat(w, axis=1)
meshed = np.stack([xx, yy], 2)
return meshed
def visualize_dense_flow(dense_flow):
hsv = np.zeros([dense_flow.shape[0], dense_flow.shape[1]])
hsv = np.stack([hsv, hsv, hsv], 2).astype(np.uint8)
hsv[..., 1] = 255
mag, ang = cv2.cartToPolar(dense_flow[:, :, 0], dense_flow[:, :, 1])
hsv[..., 0] = ang * 180 / np.pi / 2
hsv[..., 2] = cv2.normalize(mag, None, 0, 255, cv2.NORM_MINMAX)
rgb = cv2.cvtColor(hsv, cv2.COLOR_HSV2BGR)
rgb = rgb.astype(np.uint8)
return rgb |