UTF-8 letters support

[lavrenkov-sketch]

How to add support for UTF-8 fonts, I want to display predictions in Russian, the opencv library itself seems to be able to do this

[github-actions]

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[kinoute]

I'm interested too. The plot_one_box function uses OpenCV to draw rectangles and put texts. By default OpenCV seems limited when it comes to fonts (no unicode version) but they added in version 3 a free type module to load custom true type font:

See: http://fireant.github.io/misc/2017/01/28/ttf-opencv.html

There is plot_one_box_PIL in utils/plots.py that uses PIL instead. PIL can load custom True Type fonts but I couldn't make it work with detect.py and "Arial Unicode" or another custom font. Rectangles are not displayed either.

[kinoute]

By the way, not only labels containing UTF-8 characters such as accents don't appear on images, the results (class_name(s)), seem to remove the accents as well. The problem doesn't appear only when calling openCV, it seems general to the project.

Example: "Société France" would become "Socit France"

[glenn-jocher]

@kinoute @lavrenkov-sketch we have a PIL-based plotter that might be better for UTF-8:

yolov5/utils/plots.py

Lines 82 to 94 in e96c74b

	def plot_one_box_PIL(box, im, color=(128, 128, 128), label=None, line_thickness=None):
	# Plots one bounding box on image 'im' using PIL
	im = Image.fromarray(im)
	draw = ImageDraw.Draw(im)
	line_thickness = line_thickness or max(int(min(im.size) / 200), 2)
	draw.rectangle(box, width=line_thickness, outline=color) # plot
	if label:
	font = ImageFont.truetype("Arial.ttf", size=max(round(max(im.size) / 40), 12))
	txt_width, txt_height = font.getsize(label)
	draw.rectangle([box[0], box[1] - txt_height + 4, box[0] + txt_width, box[1]], fill=color)
	draw.text((box[0], box[1] - txt_height + 1), label, fill=(255, 255, 255), font=font)
	return np.asarray(im)

[lavrenkov-sketch]

@glenn-jocher how can i use plot_one_box_PIL it returns an array and doesn't draw any labels on the image

[lavrenkov-sketch]

im0 = plot_one_box_PIL(xyxy, im0, label=label, color=colors(c, True), line_thickness=line_thickness)

[glenn-jocher]

@lavrenkov-sketch I've opened up PR #4407 to assign a default line width with PIL plotting, not sure why it was missing.

Can you supply an example class name that is failing with the existing cv2 plotting function? We should update this to switch to PIL automatically on detection of UTF-8 characters.

[kinoute]

"Société Générale", image from W&B (same in inference, running the model through Docker Hub):

[glenn-jocher]

@kinoute perfect thanks! I'll see if we can merge a more comprehensive fix this weekend.

But wait in this case the cv2 label function works with a silent error of not displaying the é characters? Is this master code or did you modify this to remove these characters?

[kinoute]

I didn't modify anything, it comes from a training I did 3 days ago. I train with the official docker image. To avoid this problem, I temporarily removed the accents from my yaml file. Do note that accents don't show up in "results" at inference time too. It's not only a CV2 problem.

[glenn-jocher]

@kinoute I see correct console printout but incorrect cv2 plotting in Colab.

Can you run this code to reproduce in you environment:

# PyTorch Hub
import torch

# Model
model = torch.hub.load('ultralytics/yolov5', 'yolov5s')
model.names[0] = 'Société Générale'

# Images
dir = 'https://ultralytics.com/images/'
imgs = [dir + f for f in ('zidane.jpg', 'bus.jpg')]  # batch of images

# Inference
results = model(imgs)
results.print()
results.save()
results.pandas().xyxy[0]

[kinoute]

@glenn-jocher It works like this because you overwrite the class name right before the inference, but I think the problem comes from the time the classes are loaded from the yaml dataset file. I was about to reproduce the issue like this:

# download yolov5 master
git clone https://github.com/ultralytics/yolov5
cd yolov5

# download coco128 dataset
chmod +x data/scripts/get_coco128.sh && ./data/scripts/get_coco128.sh

# change first class name in data/coco128.yaml from "person" to "person Société Générale"
vi data/coco128.yaml

# train
python train.py --img 640 --batch 16 --epochs 3 --data coco128.yaml --weights yolov5s.pt —cache

After the training, we can confirm some images have accents removed, such as runs/train/exp/confusion_matrix.png and runs/train/exp/val_batch0_labels.jpg:

Now, on the detection/inference, running:

python detect.py --weights runs/train/exp/weights/best.pt --img 640 --conf 0.25 --source data/images/ --save-txt

shows the same problem too:

And finally, using the Docker Hub for inference:

 /sites/yolov5  python3
Python 3.8.9 (default, Apr  3 2021, 01:49:17)
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import torch
>>> model = torch.hub.load('ultralytics/yolov5', 'custom', path="runs/train/exp/weights/best.pt")
Using cache found in /Users/kinoute/.cache/torch/hub/ultralytics_yolov5_master
YOLOv5 🚀 2021-8-14 torch 1.7.0 CPU

Fusing layers...
Model Summary: 224 layers, 7266973 parameters, 0 gradients, 17.0 GFLOPs
Adding AutoShape...
>>> dir = 'https://ultralytics.com/images/'
>>> imgs = [dir + f for f in ('zidane.jpg', 'bus.jpg')]  # batch of images
>>> results = model(imgs)
>>> results.print()
image 1/2: 720x1280 2 person Socit Gnrales, 2 ties
image 2/2: 1080x810 4 person Socit Gnrales, 1 bus
Speed: 536.4ms pre-process, 403.4ms inference, 2.1ms NMS per image at shape (2, 3, 640, 640)
>>> results.save()
Saved 2 images to 'runs/detect/exp3'
>>> results.pandas().xyxy[0]
         xmin        ymin         xmax        ymax  confidence  class  \
0  748.832520   38.970703  1150.665039  711.768921    0.866193      0
1  113.337891  193.695984  1127.441406  712.344666    0.676592      0
2  433.699280  433.693848   517.761475  715.654663    0.659638     27
3  986.345520  303.328003  1027.942627  420.201050    0.278434     27

                  name
0  person Socit Gnrale
1  person Socit Gnrale
2                  tie
3                  tie
>>>

We can see in the "textual" result, the accents don't appear as well.