Pdfsandwich 是将文本添加到图像形式的文本 PDF 文件 (如扫描书籍) 的工具。它使用光学字符识别(OCR)创建一个额外的图层，包含了原始页面已识别的文本。这对于复制和处理文本很有用。
and silver ligree ornaments ; gold and silver ower-stands, etc. ;
elaborate coloured patterns of carpets in brilliant tints are not
Another peculiarity resides in the extreme restlessness of
my visual objects. It is often very difficult to keep them still,
as well as from changing in character. They will rapidly oscil-
late or else rotate to a most perplexing degree, and when the
characters change at the same time a critical examination is
almost impossible. When the process is in full activity,l feel
as if I were a mere spectator at a diorama of a very eccentric
kind, and was in no way concerned with the getting up of the
When a. succession of images has been passing, I sometimes
alez ermz'ne to introduce an object, say a watch. Very often it is
next to impossible to succeed. There is an evident struggle.
The watch, pure and simple, will not come; but some hybrid
structure appears something round, perhaps but it lapses into
a warming-pan or other unexpected object.
This practice has brought to my mind very clearly the dis-
tinction between at least one form of automatism of the brain
and volition; but the strength of the former is enormous, for
the visual objects, when in full career of the change, are impera-
tive in their refusal to be interfered with.
svn checkout svn://svn.code.sf.net/p/pdfsandwich/code/trunk/src pdfsandwich