python - pdfminer/poppler - 如何设置编码

Question

我有一个文件，即http://www.agfl.cs.ru.nl/papers/manual28.pdf （英文）

Pdfminer 和 poppler 在大多数解析页面中显示相同的结果，例如： ¾º¿  ÒÙ Öݸ ¾¼¼ Ⱥ ¾º ÂÙÒ ¸ ¾¼¼ ź Ë ÙØØ Ö¸ Ǻ Ë

它似乎无法读取字体自定义编码。如何指定？

这是代码示例：

# poppler
input_filename = '/tmp/manual28.pdf'
document = poppler.document_new_from_file('file://%s' %  urllib.pathname2url(os.path.abspath(input_filename)), None)
n_pages = document.get_n_pages()
for i in range(n_pages):
    page = document.get_page(i)
    print page.get_text()
    # chardet.detect(page.get_text()) # utf8 all time

# pdfminer
def pdf_to_html(in_fp, out_fp, codec='utf-8', maxpages=0, pagenos=None, html=True):
    rsrcmgr = PDFResourceManager()
    laparams = LAParams()

    if isinstance(in_fp, basestring):
        in_fp = open(in_fp, 'rb')

    if isinstance(out_fp, basestring):
        out_fp = open(out_fp, 'wb')

    if html:
        device = HTMLConverter(rsrcmgr, out_fp, codec=codec, laparams=laparams)
    else:
        device = TextConverter(rsrcmgr, out_fp, codec=codec, laparams=laparams)

    interpreter = PDFPageInterpreter(rsrcmgr, device)
    for page in PDFPage.get_pages(in_fp, pagenos, maxpages=maxpages):
        interpreter.process_page(page)

    in_fp.close()
    device.close()
    out_fp.close()