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import json
import os
from PIL import Image, ImageDraw, ImageColor, ImageFont
def load_annotation(image_key):
with open(os.path.join('annotations', '{:s}.json'.format(image_key)), 'r') as fid:
anno = json.load(fid)
return anno
def visualize_gt(image_key, anno, color='green', alpha=125, font=None):
try:
font = ImageFont.truetype('arial.ttf', 15)
except:
print('Falling back to default font...')
font = ImageFont.load_default()
with Image.open(os.path.join('images', '{:s}.jpg'.format(image_key))) as img:
img = img.convert('RGBA')
img_draw = ImageDraw.Draw(img)
rects = Image.new('RGBA', img.size)
rects_draw = ImageDraw.Draw(rects)
for obj in anno['objects']:
x1 = obj['bbox']['xmin']
y1 = obj['bbox']['ymin']
x2 = obj['bbox']['xmax']
y2 = obj['bbox']['ymax']
color_tuple = ImageColor.getrgb(color)
if len(color_tuple) == 3:
color_tuple = color_tuple + (alpha,)
else:
color_tuple[-1] = alpha
rects_draw.rectangle((x1+1, y1+1, x2-1, y2-1), fill=color_tuple)
img_draw.line(((x1, y1), (x2, y1), (x2, y2), (x1, y2), (x1, y1)), fill='black', width=1)
class_name = obj['label']
img_draw.text((x1 + 5, y1 + 5), class_name, font=font)
img = Image.alpha_composite(img, rects)
return img
if __name__ == '__main__':
image_key = 'Bh36Ed4HBJatMpSNnFTgTw'
# load the annotation json
anno = load_annotation(image_key)
# visualize traffic sign boxes on the image
vis_img = visualize_gt(image_key, anno)
vis_img.show() |