MinerU/magic_pdf/libs/pdf_image_tools.py

from loguru import logger

from magic_pdf.io.AbsReaderWriter import AbsReaderWriter
from magic_pdf.libs.commons import fitz
from magic_pdf.libs.commons import join_path
from magic_pdf.libs.hash_utils import compute_sha256


def cut_image(bbox: tuple, page_num: int, page: fitz.Page, return_path, imageWriter: AbsReaderWriter):
    """
    从第page_num页的page中，根据bbox进行裁剪出一张jpg图片，返回图片路径
    save_path：需要同时支持s3和本地, 图片存放在save_path下，文件名是: {page_num}_{bbox[0]}_{bbox[1]}_{bbox[2]}_{bbox[3]}.jpg , bbox内数字取整。
    """
    # 拼接文件名
    filename = f"{page_num}_{int(bbox[0])}_{int(bbox[1])}_{int(bbox[2])}_{int(bbox[3])}"

    # 老版本返回不带bucket的路径
    img_path = join_path(return_path, filename) if return_path is not None else None

    # 新版本生成平铺路径
    img_hash256_path = f"{compute_sha256(img_path)}.jpg"

    if any([bbox[0] >= bbox[2], bbox[1] >= bbox[3]]):
        logger.warning(f"image_bboxes: 错误的box, {bbox}")
        return img_hash256_path

    # 将坐标转换为fitz.Rect对象
    rect = fitz.Rect(*bbox)
    # 配置缩放倍数为3倍
    zoom = fitz.Matrix(3, 3)
    # 截取图片
    pix = page.get_pixmap(clip=rect, matrix=zoom)

    byte_data = pix.tobytes(output='jpeg', jpg_quality=95)

    imageWriter.write(byte_data, img_hash256_path, AbsReaderWriter.MODE_BIN)

    return img_hash256_path