I am trying to use Tesseract OCR Library in order to create a program to read pictures of elevator floor numbers. I haven't found any example on how to include the Tesseract Library into a C++ file. Something like:
#include "tesseract.h"
I am using Tesseract v 3.00 on Ubuntu 10.10.
The PlatformStatus Page has some comments on how to install it. It has dependencies (leptonica) which also need to be installed.
Another solution also linked from the above discussion has similar details for other linux distributions.
When it comes to linking with your program, this post has some specifics
There is also a C wrapper to the underlying API calls; looking at the files included should tell you what to include. Other wrappers are available here.
The documentation of the base API class are here...
A comment from the Platform Status page for the installation.
Comment by tim.lawr...#gmail.com, Nov 23, 2011
I successfully installed tesseract-ocr on Ubuntu 11.10 64Bit using these commands:
sudo apt-get install libleptonica-dev autoconf automake libtool libpng12-dev libjpeg62- dev libtiff4-dev zlib1g-dev subversion g++
cd
svn checkout http://tesseract-ocr.googlecode.com/svn/trunk/ tesseract-ocr
cd tesseract-ocr
./autogen.sh
./configure
make
sudo make install
sudo ldconfig
cd /usr/local/share/tessdata/
sudo wget http://tesseract-ocr.googlecode.com/files/eng.traineddata.gz
sudo gunzip eng.traineddata.gz
cd ~/tesseract-ocr/
tesseract phototest.tif phototest
cat phototest.txt
Related
I have been trying to install GLFW and GLFW3, using Terminal to install
sudo apt-get install GLFW
sudo apt-get install GLFW3
Whenever I do so, I get results such as
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package glfw3
I have been trying to install GLFW for two hours now, and I'm getting a bit impatient. Also I'm very new to Linux (Mint), so I apologize if I'm doing something stupid...
EDIT:
No matter what I try, my program encounters
/home/myusername/Desktop/basic_window.cpp:11:21: fatal error: GL/glfw.h: No such file or directory
#include <GL/glfw.h>
^
compilation terminated.
Having a frustrating time with this, not sure why this is much more complicated than the other libraries I've installed so far.
I have been trying to install GLFW and GLFW3, using Terminal to install...
On Mint 17, it looks like you need to install libglfw2. So perform a sudo apt-get install libglfw2.
If you plan on developing against it, then install libglfw-dev instead. Notice the lack of a version number.
If interested, perform apt-cache search glfw
In Debian-based systems such as Ubuntu and Mint, library packages typically have names that begin with "lib", and development headers (for compiling new programs that use the library) are in a separate package whose name ends with "-dev".
Ubuntu 14.04 has GLFW 2 packaged as libglfw2 and libglfw-dev. Mint doesn't seem to have those packages, but you can probably use the Ubuntu ones since Mint 17 is based on Ubuntu 14.04.
GLFW 3 isn't in Ubuntu 14.04, but it looks like it'll be in 14.10 (as libglfw3 and libglfw3-dev).
Unless you really need GLFW 3 specifically, you're probably better off sticking with the packaged GLFW 2. Packages get easy automatic upgrades; compiling stuff "by hand" is a good way to end up with lots of cruft in your system with no automatic upgrade or uninstall.
Download GLFW source packages from their website.
Extract the folder glfw-3.0.4 from the tarball
Open console
Navigate to the folder you just extracted and go inside of it using cd
Type cmake . (be sure you include the dot)
If cmake . fails, then type the following as root:
apt-get install cmake
If you don't think you're root then type the following:
sudo apt-get install cmake
If that doesn't work then type the following as root, or add sudo if you're not root:
apt-get install build-essential cmake
Once you have cmake installed, navigate back to the folder and try cmake . again.
I am using a server running with Ubuntu 12.04
I want to install the boost libraries in it. I know
sudo apt-get install libboost-all-dev
will make the work done, but it installs the latest version version 1.52 or above.
But I need to install the particular version 1.40 as there is a problem in a simulator which I am using for my academic purpose. What is the particular command for that so that I can install the boost libraries along with the other requirements for it like the linking files
Thanks in advance
Quick answer: sudo apt-get install libboost-dev= 1.40.0.1
If it doesn't work, continue reading.
The apt-get does support installing a particular version of a package as long as it is in an archive that apt knows about. From the apt-get manpage:
A specific version of a package can be selected for installation by following the
package name with an equals and the version of the package to select. This will
cause that version to be located and selected for install. Alternatively a specific
distribution can be selected by following the package name with a slash and the version of
the distribution or the Archive name (stable, frozen, unstable).
For e.g. if you wanted to install apache 2.20 for Ubuntu, you would do something like:
sudo apt-get install apache2=2.2.20-1ubuntu1
Note that you may need to do some dependency resolution on your own in this case, but if there are any problems apt-get will tell you what is causing them. For e.g.(on 11.04)
sudo apt-get install apache2=2.2.20-1ubuntu1 \
apache2.2-common=2.2.20-1ubuntu1 \
apache2.2-bin=2.2.20-1ubuntu1 \
apache2-mpm-worker=2.2.20-1ubuntu1
Note: You must first check if build 1.40 is still available. For that use:
aptitude search libboost
If aptitude search command don't give you sufficient results, try sudo aptitude update and then run aptitude search again.
You might have to investigate whether debs from earlier Ubuntu versions can be installed. i.e. remove the current package, download the debs and try installing them. But there could be dependency on older versions of the standard library.If so, you can probably try downloading the source from launchpad.
As a last resort, download from boost.org and build it - painfully!
EDIT: I see you have asked the same question on ubuntu forums and it seems that you have 1.48 as the default. You might have to build the library itself. Can you try this apt-get
sudo apt-get install libboost1.40-all-dev=1.40.0-4ubuntu4
If this doesn't work, you will have to build it and install it yourself. You can download the source from
Download source (1.40.0): libboost 1.40.0 source files
After it's installed, run the following command to hold your installed version, preventing the package manager from automatically updating it in the future:
sudo echo "[packagename] hold" | sudo dpkg --set-selections
Source:How to Downgrade Packages on Ubuntu
Generally you download sources, build it (some parts are not just headers like filesystem on Windows). Then you can select which subset of libraries you want to install (you can make compact version with only what you need). Then by invoking bootstrap script you build it to another directory this subset of libraries you want and then you invoke install.
Here is a pretty good description how to do it: http://ubuntuforums.org/showthread.php?t=1180792
I'm trying to build some code on Ubuntu 10.04 LTS that uses OpenSSL 1.0.0. When I run make, it invokes g++ with the "-lssl" option. The source includes:
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/des.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
I ran:
$ sudo apt-get install openssl
Reading package lists... Done
Building dependency tree
Reading state information... Done
openssl is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
But I guess the openssl package doesn't include the library. I get these errors on make:
foo.cpp:21:25: error: openssl/bio.h: No such file or directory
foo.cpp:22:28: error: openssl/buffer.h: No such file or directory
foo.cpp:23:25: error: openssl/des.h: No such file or directory
foo.cpp:24:25: error: openssl/evp.h: No such file or directory
foo.cpp:25:25: error: openssl/pem.h: No such file or directory
foo.cpp:26:25: error: openssl/rsa.h: No such file or directory
How do I install the OpenSSL C++ library on Ubuntu 10.04 LTS?
I did a man g++ and (under "Options for Linking") for the -l option it states: " The linker searches a standard list of directories for the library..." and "The directories searched include several standard system directories..." What are those standard system directories?
You want to install the development package, which is libssl-dev:
sudo apt-get install libssl-dev
Run:
apt-get install libssl-dev
All of these answers are very outdated and from when the package was still being developed. You can now just use the "normal" command listed below:
sudo apt install openssl
Edit: OP's question is poorly worded... after all, OpenSSL is a library itself, so I read his question too quickly before answering. The command above installs "normal" OpenSSL.
Toward the bottom of his question he mentions that make fails, suggesting he is compiling the package manually. And yes, even if you download the TAR ball, it will include all of the openssl and libssl files, which you can then make from.
What OP is really asking for is the OpenSSL Development Library, in which case you can first install OpenSSL using the above command, and then run this afterwards:
sudo apt install libssl-dev
More info: https://linuxtect.com/how-to-install-openssl-libraries-on-ubuntu-debian-mint/
I found a detailed solution here: Install OpenSSL Manually On Linux
From the blog post...:
Steps to download, compile, and install are as follows (I'm installing version 1.0.1g below; please replace "1.0.1g" with your version number):
Step – 1 : Downloading OpenSSL:
Run the command as below :
$ wget http://www.openssl.org/source/openssl-1.0.1g.tar.gz
Also, download the MD5 hash to verify the integrity of the downloaded file for just varifacation purpose. In the same folder where you have downloaded the OpenSSL file from the website :
$ wget http://www.openssl.org/source/openssl-1.0.1g.tar.gz.md5
$ md5sum openssl-1.0.1g.tar.gz
$ cat openssl-1.0.1g.tar.gz.md5
Step – 2 : Extract files from the downloaded package:
$ tar -xvzf openssl-1.0.1g.tar.gz
Now, enter the directory where the package is extracted like here is openssl-1.0.1g
$ cd openssl-1.0.1g
Step – 3 : Configuration OpenSSL
Run below command with optional condition to set prefix and directory where you want to copy files and folder.
$ ./config --prefix=/usr/local/openssl --openssldir=/usr/local/openssl
You can replace “/usr/local/openssl” with the directory path where you want to copy the files and folders. But make sure while doing this steps check for any error message on terminal.
Step – 4 : Compiling OpenSSL
To compile openssl you will need to run 2 command : make, make install as below :
$ make
Note: check for any error message for verification purpose.
Step -5 : Installing OpenSSL:
$ sudo make install
Or without sudo,
$ make install
That’s it. OpenSSL has been successfully installed. You can run the version command to see if it worked or not as below :
$ /usr/local/openssl/bin/openssl version
OpenSSL 1.0.1g 7 Apr 2014
How could I have figured that out for
myself (other than asking this
question here)? Can I somehow tell
apt-get to list all packages, and grep
for ssl? Or do I need to know the
"lib*-dev" naming convention?
If you're linking with -lfoo then the library is likely libfoo.so. The library itself is probably part of the libfoo package, and the headers are in the libfoo-dev package as you've discovered.
Some people use the GUI "synaptic" app (sudo synaptic) to (locate and) install packages, but I prefer to use the command line. One thing that makes it easier to find the right package from the command line is the fact that apt-get supports bash completion.
Try typing sudo apt-get install libssl and then hit tab to see a list of matching package names (which can help when you need to select the correct version of a package that has multiple versions or other variations available).
Bash completion is actually very useful... for example, you can also get a list of commands that apt-get supports by typing sudo apt-get and then hitting tab.
Another way to install openssl library from source code on Ubuntu, follows steps below, here WORKDIR is your working directory:
sudo apt-get install pkg-config
cd WORKDIR
git clone https://github.com/openssl/openssl.git
cd openssl
./config
make
sudo make install
# Open file /etc/ld.so.conf, add a new line: "/usr/local/lib" at EOF
sudo ldconfig
You want the openssl-devel package.
At least I think it's -devel on Ubuntu. Might be -dev. It's one of the two.
As a general rule, when on Debian or Ubuntu and you're missing a development file (or any other file for that matter), use apt-file to figure out which package provides that file:
~ apt-file search openssl/bio.h
android-libboringssl-dev: /usr/include/android/openssl/bio.h
libssl-dev: /usr/include/openssl/bio.h
libwolfssl-dev: /usr/include/cyassl/openssl/bio.h
libwolfssl-dev: /usr/include/wolfssl/openssl/bio.h
A quick glance at each of the packages that are returned by the command, using apt show will tell you which among the packages is the one you're looking for:
~ apt show libssl-dev
Package: libssl-dev
Version: 1.1.1d-2
Priority: optional
Section: libdevel
Source: openssl
Maintainer: Debian OpenSSL Team <pkg-openssl-devel#lists.alioth.debian.org>
Installed-Size: 8,095 kB
Depends: libssl1.1 (= 1.1.1d-2)
Suggests: libssl-doc
Conflicts: libssl1.0-dev
Homepage: https://www.openssl.org/
Tag: devel::lang:c, devel::library, implemented-in::TODO, implemented-in::c,
protocol::ssl, role::devel-lib, security::cryptography
Download-Size: 1,797 kB
APT-Sources: http://ftp.fr.debian.org/debian unstable/main amd64 Packages
Description: Secure Sockets Layer toolkit - development files
This package is part of the OpenSSL project's implementation of the SSL
and TLS cryptographic protocols for secure communication over the
Internet.
.
It contains development libraries, header files, and manpages for libssl
and libcrypto.
N: There is 1 additional record. Please use the '-a' switch to see it
Go to the official website and download the source code for the version you need
Then unzip the update package and execute the following command
./config --prefix=/usr/local/ssl --openssldir=/usr/local/ssl -Wl,-rpath,/usr/local/ssl/lib shared
Because the default is to generate only static libraries, if you want dynamic libraries, add the "shared" option
make && make install
sudo apt-get install libcurl4-openssl-dev
How to download and install GDB(GNU Debugger) on Fedora Linux Machine.. I have tried downloading from gnu website 7.1 package, but then it fails during
./configure and then make command...
Please share the source from where i can get information on the same.
Thanks..
I have found this tutorial which might be helpful to install gdb.
http://www.tutorialspoint.com/gnu_debugger/installing_gdb.htm
But for me the command:
yum install gdb
works.
You may need to install some development packages with header files needed to build gdb. The exact package list depends on error messages from ./configure and make. Here is installed package list on my system:
# rpm -qa "*devel"
kernel-devel-2.6.23.1-42.fc8
ncurses-devel-5.6-12.20070812.fc8
python-devel-2.5.1-15.fc8
expat-devel-2.0.1-2
libtirpc-devel-0.1.7-12.fc8
glibc-devel-2.7-2
libstdc++-devel-4.1.2-33
Try to install all of them with yum.
How do you install Boost on MacOS?
Right now I can't find bjam for the Mac.
You can get the latest version of Boost by using Homebrew.
brew install boost.
Download MacPorts, and run the following command:
sudo port install boost
Just get the source, and compile Boost yourself; it has become very easy. Here is an example for the current version of Boost on the current macOS as of this writing:
Download the the .tar.gz from https://www.boost.org/users/download/#live
Unpack and go into the directory:tar -xzf boost_1_50_0.tar.gz
cd boost_1_50_0
Configure (and build bjam):
./bootstrap.sh --prefix=/some/dir/you/would/like/to/prefix
Build:
./b2
Install:./b2 install
Depending on the prefix you choose in Step 3, you might need to sudo Step 5, if the script tries copy files to a protected location.
Unless your compiler is different than the one supplied with the Mac XCode Dev tools, just follow the instructions in section 5.1 of Getting Started Guide for Unix Variants. The configuration and building of the latest source couldn't be easier, and it took all about about 1 minute to configure and 10 minutes to compile.
Install both of them using homebrew separately.
brew install boost
brew install bjam
Fink appears to have a full set of Boost packages...
With fink installed and running just do
fink install boost1.35.nopython
at the terminal and accept the dependencies it insists on. Or use
fink list boost
to get a list of different packages that are availible.
Install Xcode from the mac app store.
Then use the command:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
the above will install homebrew and allow you to use brew in terminal
then just use command :
brew install boost
which would then install the boost libraries to <your macusername>/usr/local/Cellar/boost
In order to avoid troubles compiling third party libraries that need boost installed in your system, run this:
sudo port install boost +universal
Try +universal
One thing to note: in order for that to make a difference you need to have built python with +universal, if you haven't or you're not sure you can just rebuild python +universal. This applies to both brew as well as macports.
$ brew reinstall python
$ brew install boost
OR
$ sudo port -f uninstall python
$ sudo port install python +universal
$ sudo port install boost +universal
you can download bjam for OSX (or any other OS) here
If you are too lazy like me:
conda install -c conda-forge boost