Add script for drawing json

scripts/labelme_draw_json

@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+
+import argparse
+import json
+import base64
+from cStringIO import StringIO
+import PIL.Image
+import PIL.ImageDraw
+import matplotlib.pyplot as plt
+import numpy as np
+from skimage.color import label2rgb
+
+
+def labelcolormap(N=256):
+
+    def bitget(byteval, idx):
+        return ((byteval & (1 << idx)) != 0)
+
+    cmap = np.zeros((N, 3))
+    for i in xrange(0, N):
+        id = i
+        r, g, b = 0, 0, 0
+        for j in xrange(0, 8):
+            r = np.bitwise_or(r, (bitget(id, 0) << 7-j))
+            g = np.bitwise_or(g, (bitget(id, 1) << 7-j))
+            b = np.bitwise_or(b, (bitget(id, 2) << 7-j))
+            id = (id >> 3)
+        cmap[i, 0] = r
+        cmap[i, 1] = g
+        cmap[i, 2] = b
+    cmap = cmap.astype(np.float32) / 255
+    return cmap
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('json_file')
+    args = parser.parse_args()
+
+    json_file = args.json_file
+
+    data = json.load(open(json_file))
+
+    # string -> numpy.ndarray
+    f = StringIO()
+    f.write(base64.b64decode(data['imageData']))
+    img = np.array(PIL.Image.open(f))
+
+    target_names = {'background': 0}
+    label = np.zeros(img.shape[:2], dtype=np.int32)
+    for shape in data['shapes']:
+        # get label value
+        label_value = target_names.get(shape['label'])
+        if label_value is None:
+            label_value = len(target_names)
+            target_names[shape['label']] = label_value
+        # polygon -> mask
+        mask = np.zeros(img.shape[:2], dtype=np.uint8)
+        mask = PIL.Image.fromarray(mask)
+        xy = map(tuple, shape['points'])
+        PIL.ImageDraw.Draw(mask).polygon(xy=xy, outline=1, fill=1)
+        mask = np.array(mask)
+        # fill label value
+        label[mask == 1] = label_value
+
+    cmap = labelcolormap(len(target_names))
+    label_viz = label2rgb(label, img, colors=cmap)
+    label_viz[label == target_names['background']] = 0
+
+    plt.subplots_adjust(left=0, right=1, top=1, bottom=0,
+                        wspace=0, hspace=0)
+    plt.margins(0, 0)
+    plt.gca().xaxis.set_major_locator(plt.NullLocator())
+    plt.gca().yaxis.set_major_locator(plt.NullLocator())
+
+    plt.subplot(121)
+    plt.axis('off')
+    plt.imshow(img)
+
+    plt.subplot(122)
+    plt.axis('off')
+    plt.imshow(label_viz)
+    # plot target_names legend
+    plt_handlers = []
+    plt_titles = []
+    for l_name, l_value in target_names.items():
+        fc = cmap[l_value]
+        p = plt.Rectangle((0, 0), 1, 1, fc=fc)
+        plt_handlers.append(p)
+        plt_titles.append(l_name)
+    plt.legend(plt_handlers, plt_titles, loc='lower right', framealpha=.5)
+
+    plt.show()
+
+
+if __name__ == '__main__':
+    main()

setup.py

@@ -58,4 +58,5 @@ setup(
     ],
     package_data={'labelme': ['icons/*', 'resources.qrc']},
     entry_points={'console_scripts': ['labelme=labelme.app:main']},
+    scripts=['scripts/labelme_draw_json'],
 )