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# Copyright (C) 2021-2025, Mindee.
# This program is licensed under the Apache License 2.0.
# See LICENSE or go to <https://opensource.org/licenses/Apache-2.0> for full license details.
import logging
from typing import Any
import numpy as np
from anyascii import anyascii
from PIL import Image, ImageDraw
from .fonts import get_font
__all__ = ["synthesize_page", "synthesize_kie_page"]
# Global variable to avoid multiple warnings
ROTATION_WARNING = False
def _warn_rotation(entry: dict[str, Any]) -> None: # pragma: no cover
global ROTATION_WARNING
if not ROTATION_WARNING and len(entry["geometry"]) == 4:
logging.warning("Polygons with larger rotations will lead to inaccurate rendering")
ROTATION_WARNING = True
def _synthesize(
response: Image.Image,
entry: dict[str, Any],
w: int,
h: int,
draw_proba: bool = False,
font_family: str | None = None,
smoothing_factor: float = 0.75,
min_font_size: int = 6,
max_font_size: int = 50,
) -> Image.Image:
if len(entry["geometry"]) == 2:
(xmin, ymin), (xmax, ymax) = entry["geometry"]
polygon = [(xmin, ymin), (xmax, ymin), (xmax, ymax), (xmin, ymax)]
else:
polygon = entry["geometry"]
# Calculate the bounding box of the word
x_coords, y_coords = zip(*polygon)
xmin, ymin, xmax, ymax = (
int(round(w * min(x_coords))),
int(round(h * min(y_coords))),
int(round(w * max(x_coords))),
int(round(h * max(y_coords))),
)
word_width = xmax - xmin
word_height = ymax - ymin
# If lines are provided instead of words, concatenate the word entries
if "words" in entry:
word_text = " ".join(word["value"] for word in entry["words"])
else:
word_text = entry["value"]
# Find the optimal font size
try:
font_size = min(word_height, max_font_size)
font = get_font(font_family, font_size)
text_width, text_height = font.getbbox(word_text)[2:4]
while (text_width > word_width or text_height > word_height) and font_size > min_font_size:
font_size = max(int(font_size * smoothing_factor), min_font_size)
font = get_font(font_family, font_size)
text_width, text_height = font.getbbox(word_text)[2:4]
except ValueError:
font = get_font(font_family, min_font_size)
# Create a mask for the word
mask = Image.new("L", (w, h), 0)
ImageDraw.Draw(mask).polygon([(int(round(w * x)), int(round(h * y))) for x, y in polygon], fill=255)
# Draw the word text
d = ImageDraw.Draw(response)
try:
try:
d.text((xmin, ymin), word_text, font=font, fill=(0, 0, 0), anchor="lt")
except UnicodeEncodeError:
d.text((xmin, ymin), anyascii(word_text), font=font, fill=(0, 0, 0), anchor="lt")
# Catch generic exceptions to avoid crashing the whole rendering
except Exception: # pragma: no cover
logging.warning(f"Could not render word: {word_text}")
if draw_proba:
confidence = (
entry["confidence"]
if "confidence" in entry
else sum(w["confidence"] for w in entry["words"]) / len(entry["words"])
)
p = int(255 * confidence)
color = (255 - p, 0, p) # Red to blue gradient based on probability
d.rectangle([(xmin, ymin), (xmax, ymax)], outline=color, width=2)
prob_font = get_font(font_family, 20)
prob_text = f"{confidence:.2f}"
prob_text_width, prob_text_height = prob_font.getbbox(prob_text)[2:4]
# Position the probability slightly above the bounding box
prob_x_offset = (word_width - prob_text_width) // 2
prob_y_offset = ymin - prob_text_height - 2
prob_y_offset = max(0, prob_y_offset)
d.text((xmin + prob_x_offset, prob_y_offset), prob_text, font=prob_font, fill=color, anchor="lt")
return response
def synthesize_page(
page: dict[str, Any],
draw_proba: bool = False,
font_family: str | None = None,
smoothing_factor: float = 0.95,
min_font_size: int = 8,
max_font_size: int = 50,
) -> np.ndarray:
"""Draw a the content of the element page (OCR response) on a blank page.
Args:
page: exported Page object to represent
draw_proba: if True, draw words in colors to represent confidence. Blue: p=1, red: p=0
font_family: family of the font
smoothing_factor: factor to smooth the font size
min_font_size: minimum font size
max_font_size: maximum font size
Returns:
the synthesized page
"""
# Draw template
h, w = page["dimensions"]
response = Image.new("RGB", (w, h), color=(255, 255, 255))
for block in page["blocks"]:
# If lines are provided use these to get better rendering results
if len(block["lines"]) > 1:
for line in block["lines"]:
_warn_rotation(block) # pragma: no cover
response = _synthesize(
response=response,
entry=line,
w=w,
h=h,
draw_proba=draw_proba,
font_family=font_family,
smoothing_factor=smoothing_factor,
min_font_size=min_font_size,
max_font_size=max_font_size,
)
# Otherwise, draw each word
else:
for line in block["lines"]:
_warn_rotation(block) # pragma: no cover
for word in line["words"]:
response = _synthesize(
response=response,
entry=word,
w=w,
h=h,
draw_proba=draw_proba,
font_family=font_family,
smoothing_factor=smoothing_factor,
min_font_size=min_font_size,
max_font_size=max_font_size,
)
return np.array(response, dtype=np.uint8)
def synthesize_kie_page(
page: dict[str, Any],
draw_proba: bool = False,
font_family: str | None = None,
) -> np.ndarray:
"""Draw a the content of the element page (OCR response) on a blank page.
Args:
page: exported Page object to represent
draw_proba: if True, draw words in colors to represent confidence. Blue: p=1, red: p=0
font_family: family of the font
smoothing_factor: factor to smooth the font size
min_font_size: minimum font size
max_font_size: maximum font size
Returns:
the synthesized page
"""
# Draw template
h, w = page["dimensions"]
response = Image.new("RGB", (w, h), color=(255, 255, 255))
# Draw each word
for predictions in page["predictions"].values():
for prediction in predictions:
_warn_rotation(prediction) # pragma: no cover
response = _synthesize(
response=response,
entry=prediction,
w=w,
h=h,
draw_proba=draw_proba,
font_family=font_family,
)
return np.array(response, dtype=np.uint8)
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