pdf_to_img.py
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import os
import fitz
import signal
from PIL import Image
from io import BytesIO
from django.core.management import BaseCommand
from common.mixins import LoggerMixin
class Command(BaseCommand, LoggerMixin):
def __init__(self):
super().__init__()
self.log_base = '[pdf to img]'
# 处理文件开关
self.switch = True
# pdf页面转图片
self.zoom_x = 2.0
self.zoom_y = 2.0
self.trans = fitz.Matrix(self.zoom_x, self.zoom_y).preRotate(0) # zoom factor 2 in each dimension
# 优雅退出信号：15
signal.signal(signal.SIGTERM, self.signal_handler)
def signal_handler(self, sig, frame):
self.switch = False # 停止处理文件
@staticmethod
def getimage(pix):
if pix.colorspace.n != 4:
return pix
tpix = fitz.Pixmap(fitz.csRGB, pix)
return tpix
def recoverpix(self, doc, item):
x = item[0] # xref of PDF image
s = item[1] # xref of its /SMask
is_rgb = True if item[5] == 'DeviceRGB' else False
# RGB
if is_rgb:
if s == 0:
return doc.extractImage(x)
# we need to reconstruct the alpha channel with the smask
pix1 = fitz.Pixmap(doc, x)
pix2 = fitz.Pixmap(doc, s) # create pixmap of the /SMask entry
# sanity check
if not (pix1.irect == pix2.irect and pix1.alpha == pix2.alpha == 0 and pix2.n == 1):
pix2 = None
return self.getimage(pix1)
pix = fitz.Pixmap(pix1) # copy of pix1, alpha channel added
pix.setAlpha(pix2.samples) # treat pix2.samples as alpha value
pix1 = pix2 = None # free temp pixmaps
return self.getimage(pix)
# GRAY/CMYK
pix1 = fitz.Pixmap(doc, x)
pix = fitz.Pixmap(pix1) # copy of pix1, alpha channel added
if s != 0:
pix2 = fitz.Pixmap(doc, s) # create pixmap of the /SMask entry
# sanity check
if not (pix1.irect == pix2.irect and pix1.alpha == pix2.alpha == 0 and pix2.n == 1):
pix2 = None
return self.getimage(pix1)
pix.setAlpha(pix2.samples) # treat pix2.samples as alpha value
pix1 = pix2 = None # free temp pixmaps
pix = fitz.Pixmap(fitz.csRGB, pix) # GRAY/CMYK to RGB
return self.getimage(pix)
@staticmethod
def get_img_data(pix):
if type(pix) is dict: # we got a raw image
ext = pix["ext"]
img_data = pix["image"]
else: # we got a pixmap
ext = 'png'
img_data = pix.getPNGData()
return ext, img_data
@staticmethod
def split_il(il):
img_il_list = []
start = 0
length = len(il)
for i in range(length):
if i == start:
if i == length - 1:
img_il_list.append(il[start: length])
continue
elif i == length - 1:
img_il_list.append(il[start: length])
continue
if il[i][2] != il[i - 1][2]:
img_il_list.append(il[start: i])
start = i
elif il[i][3] != il[i - 1][3]:
img_il_list.append(il[start: i + 1])
start = i + 1
return img_il_list
def handle(self, *args, **kwargs):
pdf_dir = '/Users/clay/Desktop/普通打印-部分无线/竖版-无表格-农业银行'
img_dir = '/Users/clay/Desktop/普通打印-部分无线_img/竖版-无表格-农业银行'
os.makedirs(img_dir, exist_ok=True)
for d in os.listdir(pdf_dir):
# if d in ['.DS_Store', 'CH-B008486764.pdf', 'CH-B008003736.pdf', 'CH-B008487476.pdf', 'CH-B006763780.pdf',
# 'CH-B009000564.pdf', 'CH-B009020488.pdf']:
if d in ['.DS_Store', '1竖版-无表格-农业银行样例.PNG']:
continue
pdf_path = os.path.join(pdf_dir, d)
# pdf_path = '/Users/clay/Desktop/普通打印part2/工商银行(标准版)/CH-B006754676.pdf'
if os.path.isfile(pdf_path):
img_save_path = os.path.join(img_dir, d)
if os.path.exists(img_save_path):
continue
os.makedirs(img_save_path, exist_ok=True)
with fitz.Document(pdf_path) as pdf:
self.cronjob_log.info('{0} [pdf_path={1}] [metadata={2}]'.format(
self.log_base, pdf_path, pdf.metadata))
# xref_list = []
for pno in range(pdf.pageCount):
il = pdf.getPageImageList(pno)
il.sort(key=lambda x: x[0])
img_il_list = self.split_il(il)
del il
print(img_il_list)
if len(img_il_list) > 3: # 单页无规律小图过多时，使用页面转图片
page = pdf.loadPage(pno)
pm = page.getPixmap(matrix=self.trans, alpha=False)
save_path = os.path.join(img_save_path, 'page_{0}_img_0.png'.format(page.number))
pm.writePNG(save_path)
# img_path_list.append(save_path)
# self.cronjob_log.info('{0} [page to img success] [doc_id={1}] [pdf_path={2}] '
# '[page={3}]'.format(self.log_base, doc_id, pdf_path, page.number))
else: # 提取图片
for img_index, img_il in enumerate(img_il_list):
if len(img_il) == 1: # 当只有一张图片时， 简化处理
pix = self.recoverpix(pdf, img_il[0])
ext, img_data = self.get_img_data(pix)
save_path = os.path.join(img_save_path, 'page_{0}_img_{1}.{2}'.format(
pno, img_index, ext))
with open(save_path, "wb") as f:
f.write(img_data)
# img_path_list.append(save_path)
# self.cronjob_log.info(
# '{0} [extract img success] [doc_id={1}] [pdf_path={2}] [page={3}] '
# '[img_index={4}]'.format(self.log_base, doc_id, pdf_path, pno, img_index))
else: # 多张图片，竖向拼接
height_sum = 0
im_list = []
width = img_il[0][2]
for img in img_il:
# xref = img[0]
# if xref in xref_list:
# continue
height = img[3]
pix = self.recoverpix(pdf, img)
ext, img_data = self.get_img_data(pix)
# xref_list.append(xref)
im = Image.open(BytesIO(img_data))
im_list.append((height, im, ext))
height_sum += height
save_path = os.path.join(img_save_path, 'page_{0}_img_{1}.{2}'.format(
pno, img_index, im_list[0][2]))
res = Image.new(im_list[0][1].mode, (width, height_sum))
h_now = 0
for h, m, _ in im_list:
res.paste(m, box=(0, h_now))
h_now += h
res.save(save_path)
# else:
# img_dir_path = os.path.join(img_dir, d)
# os.makedirs(img_dir_path, exist_ok=True)