海信A2墨水屏，看PDF太小。放大后刷新太慢。所以想用Python把PDF分割每次看一段。
先找了大神的帖子，用PyPDF提取图像。我的是扫描件，都是灰度图。灰度图提取后用OpenCV 处理。再把处理的文件导入到WORD中，生成PDF。也尝试过用PyPDF直接生成PDF的方案，但是发现PyPDF中没有 相关函数。后来找了好多PDF的库，基本要都是读取PDF的内容。所以就只能用先生成Word再生成PDF的方案了。
github代码
import PyPDF2
import cv2
import numpy as np
import pdb
import win32com
if __name__ == '__main__':
input1 = PyPDF2.PdfFileReader(open("d:/BaiduYunDownload/test/1.pdf", "rb"))
pages=input1.getNumPages()
pic_list = []
for i in range(pages):
page_i = input1.getPage(i)
xObject = page_i['/Resources']['/XObject'].getObject()
for obj in xObject:
if xObject[obj]['/Subtype'] == '/Image':
size = (xObject[obj]['/Width'], xObject[obj]['/Height'])
data = xObject[obj].getData()
if xObject[obj]['/ColorSpace'] == '/DeviceRGB':
mode = "RGB"
else:
mode = "P"
if xObject[obj]['/Filter'] == '/FlateDecode':
# img = Image.frombytes(mode, size, data)
# img.save(obj[1:] + ".png")
img = np.fromstring(data,np.uint8)
img = img.reshape(size[1],size[0])
# pdb.set_trace()
img = 255-img
img = img+1
#cut img
img = img[:,220:-225]
cv2.imwrite("page"+"%05ui"%i+"obj"+obj[1:]+".png",img)
pic_list.append("page"+"%05ui"%i+"obj"+obj[1:]+".png")
elif xObject[obj]['/Filter'] == '/DCTDecode':
# img = open(obj[1:] + ".jpg", "wb")
# img.write(data)
# img.close()
img = np.fromstring(data,np.uint8)
cv2.imwrite(obj[1:]+".jpg",img)
elif xObject[obj]['/Filter'] == '/JPXDecode':
# img = open(obj[1:] + ".jp2", "wb")
# img.write(data)
# img.close()
img = np.fromstring(data,np.uint8)
cv2.imwrite(obj[1:]+".jp2",img)
再把png文件添加到word里
import win32com
from win32com.client import Dispatch, constants
import os
import re
w = win32com.client.Dispatch('Word.Application')
w.Visible=1
doc = w.Documents.Open("d:/BaiduYunDownload/test/1.docx")
notpage=re.compile("page.*png")
j=0
a=os.listdir("d:/BaiduYunDownload/test/")
a.reverse()
for i in a:
if notpage.match(i)!=None:
doc.InlineShapes.AddPicture("d:/BaiduYunDownload/test/"+i)
doc.Save()
