app.py

import time
from pathlib import Path
import cv2
import uvicorn
import numpy as np
import pandas as pd
from PIL import Image
from rapidocr_onnxruntime import RapidOCR
from fastapi import FastAPI, File, UploadFile, Query
from fastapi.responses import RedirectResponse

app = FastAPI()

det_models = [
    "ch_PP-OCRv4_det_infer.onnx",
    "ch_PP-OCRv3_det_infer.onnx",
    "ch_PP-OCRv2_det_infer.onnx",
    "ch_ppocr_server_v2.0_det_infer.onnx",
]

rec_models = [
    "ch_PP-OCRv4_rec_infer.onnx",
    "ch_PP-OCRv3_rec_infer.onnx",
    "ch_PP-OCRv2_rec_infer.onnx",
    "ch_PP-OCRv4_det_server_infer.onnx",
    "ch_ppocr_server_v2.0_rec_infer.onnx",
    "en_PP-OCRv3_rec_infer.onnx",
    "en_number_mobile_v2.0_rec_infer.onnx",
    "korean_mobile_v2.0_rec_infer.onnx",
    "japan_rec_crnn_v2.onnx",
]


def get_text(
    image,
    text_det=None,
    text_rec=None,
    box_thresh=0.5,
    unclip_ratio=1.6,
    text_score=0.5,
):
    det_model_path = str(Path("models") / "text_det" / text_det)
    rec_model_path = str(Path("models") / "text_rec" / text_rec)

    if (
        "v2" in rec_model_path
        or "korean" in rec_model_path
        or "japan" in rec_model_path
    ):
        rec_image_shape = [3, 32, 320]
    else:
        rec_image_shape = [3, 48, 320]

    rapid_ocr = RapidOCR(
        det_model_path=det_model_path,
        rec_model_path=rec_model_path,
        rec_img_shape=rec_image_shape,
    )

    ocr_result, infer_elapse = rapid_ocr(
        image, box_thresh=box_thresh, unclip_ratio=unclip_ratio, text_score=text_score
    )
    if not ocr_result or not infer_elapse:
        return None
    det_cost, cls_cost, rec_cost = infer_elapse
    dt_boxes, rec_res, scores = list(zip(*ocr_result))
    out_df = pd.DataFrame(
        [[rec, score] for rec, score in zip(rec_res, scores)],
        columns=("Rec", "Score"),
    )
    return out_df

@app.get("/", include_in_schema=False)
def docs_redirect():
    return RedirectResponse(url='/docs')

@app.post("/ocr")
def create_upload_file(
    file: UploadFile,
    text_det: str = Query("ch_PP-OCRv4_det_infer.onnx", enum=det_models),
    text_rec: str = Query("en_number_mobile_v2.0_rec_infer.onnx", enum=rec_models),
    box_thresh: float = 0.5,
    unclip_ratio: float = 1.6,
    text_score: float = 0.5,
):
    resp = get_text(
        file.file.read(), text_det, text_rec, box_thresh, unclip_ratio, text_score
    )
    return resp.to_dict("list")


if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=7860)