utils.py

# -*- encoding: utf-8 -*-
# @Author: SWHL
# @Contact: [email protected]
import math
import random
import time
from pathlib import Path

import cv2
import numpy as np
from PIL import Image, ImageDraw, ImageFont


def draw_ocr_box_txt(image, boxes, txts, font_path,
 scores=None, text_score=0.5):
 h, w = image.height, image.width
 img_left = image.copy()
 img_right = Image.new('RGB', (w, h), (255, 255, 255))

 random.seed(0)
 draw_left = ImageDraw.Draw(img_left)
 draw_right = ImageDraw.Draw(img_right)
 for idx, (box, txt) in enumerate(zip(boxes, txts)):
 if scores is not None and float(scores[idx]) < text_score:
 continue

 color = (random.randint(0, 255),
 random.randint(0, 255),
 random.randint(0, 255))

 box = [tuple(v) for v in box]
 draw_left.polygon(box, fill=color)
 draw_right.polygon([box[0][0], box[0][1],
 box[1][0], box[1][1],
 box[2][0], box[2][1],
 box[3][0], box[3][1]],
 outline=color)

 box_height = math.sqrt((box[0][0] - box[3][0])**2
 + (box[0][1] - box[3][1])**2)

 box_width = math.sqrt((box[0][0] - box[1][0])**2
 + (box[0][1] - box[1][1])**2)

 if box_height > 2 * box_width:
 font_size = max(int(box_width * 0.9), 10)
 font = ImageFont.truetype(font_path, font_size,
 encoding="utf-8")
 cur_y = box[0][1]
 for c in txt:
 char_size = font.getsize(c)
 draw_right.text((box[0][0] + 3, cur_y), c,
 fill=(0, 0, 0), font=font)
 cur_y += char_size[1]
 else:
 font_size = max(int(box_height * 0.8), 10)
 font = ImageFont.truetype(font_path, font_size, encoding="utf-8")
 draw_right.text([box[0][0], box[0][1]], txt,
 fill=(0, 0, 0), font=font)

 img_left = Image.blend(image, img_left, 0.5)
 img_show = Image.new('RGB', (w * 2, h), (255, 255, 255))
 img_show.paste(img_left, (0, 0, w, h))
 img_show.paste(img_right, (w, 0, w * 2, h))
 return np.array(img_show)


def visualize(image_path, boxes, txts, scores,
 font_path="./fonts/FZYTK.TTF"):
 image = Image.open(image_path)

 draw_img = draw_ocr_box_txt(image, boxes,
 txts, font_path,
 scores,
 text_score=0.5)

 draw_img_save = Path("./inference_results/")
 if not draw_img_save.exists():
 draw_img_save.mkdir(parents=True, exist_ok=True)

 time_stamp = time.strftime(
 '%Y-%m-%d-%H-%M-%S', time.localtime(time.time()))
 image_save = str(draw_img_save / f'{time_stamp}_{Path(image_path).name}')
 cv2.imwrite(image_save, draw_img[:, :, ::-1])
 return image_save