| import numpy as np |
| import matplotlib.pyplot as plt |
|
|
| def show_scribbles(mask, ax, alpha=0.5): |
| """ |
| Overlay positive scribbles (green) and negative (red) scribbles |
| Args: |
| mask: 1 x (C) x H x W or 2 x (C) x H x W |
| ax: matplotlib axis |
| alpha: transparency of the overlay |
| """ |
| mask = mask.squeeze() |
| if len(mask.shape)==2: |
| |
| h, w = mask.shape |
| color = np.array([30/255, 144/255, 255/255, alpha]) |
| mask_image = mask.reshape(h, w, 1) * color.reshape(1, 1, -1) |
| ax.imshow(mask_image) |
| elif len(mask.shape)==3: |
| |
| c, h, w = mask.shape |
| color = np.array([0, 1, 0, alpha]) |
| mask_image = mask[0,...].reshape(h, w, 1) * color.reshape(1, 1, -1) |
| ax.imshow(mask_image) |
| color = np.array([1, 0, 0, alpha]) |
| mask_image = mask[1,...].reshape(h, w, 1) * color.reshape(1, 1, -1) |
| ax.imshow(mask_image) |
| else: |
| raise ValueError("mask must be 2 or 3 dimensional") |
