Update some links

R/tesseract.R

@@ -3,7 +3,7 @@
 #' Create an OCR engine for a given language and control parameters. This can be used by
 #' the [ocr] and [ocr_data] functions to recognize text.
 #'
-#' Tesseract [control parameters](https://github.com/tesseract-ocr/tesseract/wiki/ControlParams)
+#' Tesseract [control parameters](https://tesseract-ocr.github.io/tessdoc/ControlParams)
 #'  can be set either via a named list in the
 #' `options` parameter, or in a `config` file text file which contains the parameter name
 #' followed by a space and then the value, one per line. Use [tesseract_params()] to list
@@ -21,7 +21,7 @@
 #' tesseract config files that live in the tessdata directory. See details.
 #' @param options a named list with tesseract parameters. See details.
 #' @param cache speed things up by caching engines
-#' @references [tesseract wiki: control parameters](https://github.com/tesseract-ocr/tesseract/wiki/ControlParams)
+#' @references [tesseract wiki: control parameters](https://tesseract-ocr.github.io/tessdoc/ControlParams)
 tesseract <- local({
   store <- new.env()
   function(language = "eng", datapath = NULL, configs = NULL, options = NULL, cache = TRUE){

README.md

@@ -1,11 +1,18 @@
 # tesseract
 
-> Extract text from an image. Requires that you have training data for the language you are reading. Works best for images with high contrast, little noise and horizontal text.
+> Bindings to [Tesseract-OCR](https://opensource.google/projects/tesseract): 
+  a powerful optical character recognition (OCR) engine that supports over 100 languages.
+  The engine is highly configurable in order to tune the detection algorithms and
+  obtain the best possible results.
 
 [![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
 [![CRAN_Status_Badge](http://www.r-pkg.org/badges/version/tesseract)](https://cran.r-project.org/package=tesseract)
 [![CRAN RStudio mirror downloads](http://cranlogs.r-pkg.org/badges/tesseract)](https://cran.r-project.org/package=tesseract)
 
+ - Upstream Tesseract-OCR documentation: https://tesseract-ocr.github.io/tessdoc/
+ - Introduction: https://docs.ropensci.org/tesseract/articles/intro.html
+ - Reference: https://docs.ropensci.org/tesseract/reference/ocr.html
+
 ## Hello World
 
 Simple example
@@ -55,10 +62,10 @@ Installation from source on Linux or OSX requires the `Tesseract` library (see b
 sudo apt-get install -y libtesseract-dev libleptonica-dev tesseract-ocr-eng
 ```
 
-On __Ubuntu Xenial__ and __Ubuntu Bionic__ you can use this PPA to get the latest version of Tesseract:
+On __Ubuntu__ you can optionally use [this PPA](https://launchpad.net/~alex-p/+archive/ubuntu/tesseract-ocr-devel) to get the latest version of Tesseract:
 
 ```
-sudo add-apt-repository ppa:cran/tesseract
+sudo add-apt-repository ppa:alex-p/tesseract-ocr-devel
 sudo apt-get install -y libtesseract-dev tesseract-ocr-eng
 ```
 

vignettes/intro.Rmd

@@ -122,7 +122,7 @@ cat(text)
 
 ## Tesseract Control Parameters
 
-Tesseract supports hundreds of [control parameters](https://github.com/tesseract-ocr/tesseract/wiki/ControlParams) which alter the OCR engine. Use `tesseract_params()` to list all parameters with their default value and a brief description. It also has a handy `filter` argument to quickly find parameters that match a particular string.
+Tesseract supports hundreds of [control parameters](https://tesseract-ocr.github.io/tessdoc/ControlParams) which alter the OCR engine. Use `tesseract_params()` to list all parameters with their default value and a brief description. It also has a handy `filter` argument to quickly find parameters that match a particular string.
 
 ```{r}
 # List all parameters with *colour* in name or description