`PIL.ImageDraw.text(anchor=...)` removal, reduce to `>=7.1.2` (#4842)

* Unpin Pillow

* Update requirements.txt

* Update plots.py

requirements.txt

@@ -4,7 +4,7 @@
 matplotlib>=3.2.2
 numpy>=1.18.5
 opencv-python>=4.1.2
-Pillow>=8.0.0
+Pillow>=7.1.2
 PyYAML>=5.3.1
 scipy>=1.4.1
 torch>=1.7.0

utils/plots.py

@@ -3,11 +3,11 @@
 Plotting utils
 """
 
-import math
 from copy import copy
 from pathlib import Path
 
 import cv2
+import math
 import matplotlib
 import matplotlib.pyplot as plt
 import numpy as np
@@ -80,9 +80,10 @@ class Annotator:
         if self.pil or not is_ascii(label):
             self.draw.rectangle(box, width=self.lw, outline=color)  # box
             if label:
-                w = self.font.getsize(label)[0]  # text width
+                w, h = self.font.getsize(label)  # text width
                 self.draw.rectangle([box[0], box[1] - self.fh, box[0] + w + 1, box[1] + 1], fill=color)
-                self.draw.text((box[0], box[1]), label, fill=txt_color, font=self.font, anchor='ls')
+                # self.draw.text((box[0], box[1]), label, fill=txt_color, font=self.font, anchor='ls')  # for PIL>8.0
+                self.draw.text((box[0], box[1] - h), label, fill=txt_color, font=self.font)
         else:  # cv2
             c1, c2 = (int(box[0]), int(box[1])), (int(box[2]), int(box[3]))
             cv2.rectangle(self.im, c1, c2, color, thickness=self.lw, lineType=cv2.LINE_AA)