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import io
from typing import Any, List, Union
import cv2
import gradio as gr
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.figure import Figure
from PIL import Image
from onnxtr.io import DocumentFile
from onnxtr.models import ocr_predictor
from onnxtr.models.predictor import OCRPredictor
from onnxtr.utils.visualization import visualize_page
DET_ARCHS: List[str] = [
"fast_base",
"fast_small",
"fast_tiny",
"db_resnet50",
"db_resnet34",
"db_mobilenet_v3_large",
"linknet_resnet18",
"linknet_resnet34",
"linknet_resnet50",
]
RECO_ARCHS: List[str] = [
"crnn_vgg16_bn",
"crnn_mobilenet_v3_small",
"crnn_mobilenet_v3_large",
"master",
"sar_resnet31",
"vitstr_small",
"vitstr_base",
"parseq",
]
def load_predictor(
det_arch: str,
reco_arch: str,
assume_straight_pages: bool,
straighten_pages: bool,
detect_language: bool,
load_in_8_bit: bool,
bin_thresh: float,
box_thresh: float,
disable_crop_orientation: bool = False,
disable_page_orientation: bool = False,
) -> OCRPredictor:
"""Load a predictor from doctr.models
Args:
----
det_arch: detection architecture
reco_arch: recognition architecture
assume_straight_pages: whether to assume straight pages or not
disable_crop_orientation: whether to disable crop orientation or not
disable_page_orientation: whether to disable page orientation or not
straighten_pages: whether to straighten rotated pages or not
detect_language: whether to detect the language of the text
load_in_8_bit: whether to load the image in 8 bit mode
bin_thresh: binarization threshold for the segmentation map
box_thresh: minimal objectness score to consider a box
Returns:
-------
instance of OCRPredictor
"""
predictor = ocr_predictor(
det_arch,
reco_arch,
assume_straight_pages=assume_straight_pages,
straighten_pages=straighten_pages,
detect_language=detect_language,
load_in_8_bit=load_in_8_bit,
export_as_straight_boxes=straighten_pages,
detect_orientation=not assume_straight_pages,
disable_crop_orientation=disable_crop_orientation,
disable_page_orientation=disable_page_orientation,
)
predictor.det_predictor.model.postprocessor.bin_thresh = bin_thresh
predictor.det_predictor.model.postprocessor.box_thresh = box_thresh
return predictor
def forward_image(predictor: OCRPredictor, image: np.ndarray) -> np.ndarray:
"""Forward an image through the predictor
Args:
----
predictor: instance of OCRPredictor
image: image to process
Returns:
-------
segmentation map
"""
processed_batches = predictor.det_predictor.pre_processor([image])
out = predictor.det_predictor.model(processed_batches[0], return_model_output=True)
seg_map = out["out_map"]
return seg_map
def matplotlib_to_pil(fig: Union[Figure, np.ndarray]) -> Image.Image:
"""Convert a matplotlib figure to a PIL image
Args:
----
fig: matplotlib figure or numpy array
Returns:
-------
PIL image
"""
buf = io.BytesIO()
if isinstance(fig, Figure):
fig.savefig(buf)
else:
plt.imsave(buf, fig)
buf.seek(0)
return Image.open(buf)
def analyze_page(
uploaded_file: Any,
page_idx: int,
det_arch: str,
reco_arch: str,
assume_straight_pages: bool,
disable_crop_orientation: bool,
disable_page_orientation: bool,
straighten_pages: bool,
detect_language: bool,
load_in_8_bit: bool,
bin_thresh: float,
box_thresh: float,
):
"""Analyze a page
Args:
----
uploaded_file: file to analyze
page_idx: index of the page to analyze
det_arch: detection architecture
reco_arch: recognition architecture
assume_straight_pages: whether to assume straight pages or not
disable_crop_orientation: whether to disable crop orientation or not
disable_page_orientation: whether to disable page orientation or not
straighten_pages: whether to straighten rotated pages or not
detect_language: whether to detect the language of the text
load_in_8_bit: whether to load the image in 8 bit mode
bin_thresh: binarization threshold for the segmentation map
box_thresh: minimal objectness score to consider a box
Returns:
-------
input image, segmentation heatmap, output image, OCR output
"""
if uploaded_file is None:
return None, "Please upload a document", None, None, None
if uploaded_file.name.endswith(".pdf"):
doc = DocumentFile.from_pdf(uploaded_file)
else:
doc = DocumentFile.from_images(uploaded_file)
page = doc[page_idx - 1]
img = page
predictor = load_predictor(
det_arch,
reco_arch,
assume_straight_pages,
straighten_pages,
detect_language,
load_in_8_bit,
bin_thresh,
box_thresh,
disable_crop_orientation=disable_crop_orientation,
disable_page_orientation=disable_page_orientation,
)
seg_map = forward_image(predictor, page)
seg_map = np.squeeze(seg_map)
seg_map = cv2.resize(seg_map, (img.shape[1], img.shape[0]), interpolation=cv2.INTER_LINEAR)
seg_heatmap = matplotlib_to_pil(seg_map)
out = predictor([page])
page_export = out.pages[0].export()
fig = visualize_page(out.pages[0].export(), out.pages[0].page, interactive=False, add_labels=False)
out_img = matplotlib_to_pil(fig)
return img, seg_heatmap, out_img, page_export
with gr.Blocks(fill_height=True) as demo:
gr.Markdown(
"""
<p align="center">
<img src="https://github.com/felixdittrich92/OnnxTR/raw/main/docs/images/logo.jpg" width="15%">
</p>
<div align="center">
# OnnxTR OCR Demo
[](https://github.com/felixdittrich92/OnnxTR)
[](https://pypi.org/project/onnxtr/)
</div>
## To use this interactive demo for OnnxTR:
### 1. Upload a document (PDF, JPG, or PNG)
### 2. Select the model architectures for text detection and recognition you want to use
### 3. Press the "Analyze page" button to process the uploaded document
"""
)
with gr.Row():
with gr.Column(scale=1):
upload = gr.File(label="Upload File [JPG | PNG | PDF]", file_types=["pdf", "jpg", "png"])
page_selection = gr.Slider(minimum=1, maximum=10, step=1, value=1, label="Page selection")
det_model = gr.Dropdown(choices=DET_ARCHS, value=DET_ARCHS[0], label="Text detection model")
reco_model = gr.Dropdown(choices=RECO_ARCHS, value=RECO_ARCHS[0], label="Text recognition model")
assume_straight = gr.Checkbox(value=True, label="Assume straight pages")
disable_crop_orientation = gr.Checkbox(value=False, label="Disable crop orientation")
disable_page_orientation = gr.Checkbox(value=False, label="Disable page orientation")
straighten = gr.Checkbox(value=False, label="Straighten pages")
det_language = gr.Checkbox(value=False, label="Detect language")
load_in_8_bit = gr.Checkbox(value=False, label="Load 8-bit quantized models")
binarization_threshold = gr.Slider(
minimum=0.1, maximum=0.9, value=0.3, step=0.1, label="Binarization threshold"
)
box_threshold = gr.Slider(minimum=0.1, maximum=0.9, value=0.1, step=0.1, label="Box threshold")
analyze_button = gr.Button("Analyze page")
with gr.Column(scale=3):
with gr.Row():
input_image = gr.Image(label="Input page", width=600)
segmentation_heatmap = gr.Image(label="Segmentation heatmap", width=600)
output_image = gr.Image(label="Output page", width=600)
with gr.Column(scale=2):
with gr.Row():
gr.Markdown("### OCR output")
with gr.Row():
ocr_output = gr.JSON(label="OCR output", render=True, scale=1)
analyze_button.click(
analyze_page,
inputs=[
upload,
page_selection,
det_model,
reco_model,
assume_straight,
disable_crop_orientation,
disable_page_orientation,
straighten,
det_language,
load_in_8_bit,
binarization_threshold,
box_threshold,
],
outputs=[input_image, segmentation_heatmap, output_image, ocr_output],
)
demo.launch(inbrowser=True, allowed_paths=["./data/logo.jpg"])
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