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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import PIL
from PIL import ImageDraw
def save_results(image_list, results, labels, output_dir='output/', threshold=0.5):
if not os.path.exists(output_dir):
os.makedirs(output_dir)
for idx, im in enumerate(image_list):
im = draw_box(im, results[idx], labels, threshold=threshold)
out_path = os.path.join(output_dir, f"{idx}.jpg")
im.save(out_path, quality=95)
print("save result to: " + out_path)
def draw_box(im, result, lables, threshold=0.5):
draw_thickness = min(im.size) // 320
draw = ImageDraw.Draw(im)
color_list = get_color_map_list(len(lables))
clsid2color = {n.lower():color_list[i] for i,n in enumerate(lables)}
result = [r for r in result if r["score"] >= threshold]
for dt in result:
color = tuple(clsid2color[dt["type"]])
xmin, ymin, xmax, ymax = dt["bbox"]
draw.line(
[(xmin, ymin), (xmin, ymax), (xmax, ymax), (xmax, ymin),
(xmin, ymin)],
width=draw_thickness,
fill=color)
# draw label
text = "{} {:.4f}".format(dt["type"], dt["score"])
tw, th = imagedraw_textsize_c(draw, text)
draw.rectangle(
[(xmin + 1, ymin - th), (xmin + tw + 1, ymin)], fill=color)
draw.text((xmin + 1, ymin - th), text, fill=(255, 255, 255))
return im
def get_color_map_list(num_classes):
"""
Args:
num_classes (int): number of class
Returns:
color_map (list): RGB color list
"""
color_map = num_classes * [0, 0, 0]
for i in range(0, num_classes):
j = 0
lab = i
while lab:
color_map[i * 3] |= (((lab >> 0) & 1) << (7 - j))
color_map[i * 3 + 1] |= (((lab >> 1) & 1) << (7 - j))
color_map[i * 3 + 2] |= (((lab >> 2) & 1) << (7 - j))
j += 1
lab >>= 3
color_map = [color_map[i:i + 3] for i in range(0, len(color_map), 3)]
return color_map
def imagedraw_textsize_c(draw, text):
if int(PIL.__version__.split('.')[0]) < 10:
tw, th = draw.textsize(text)
else:
left, top, right, bottom = draw.textbbox((0, 0), text)
tw, th = right - left, bottom - top
return tw, th
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