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https://github.com/shotaochi/imagerextra

imagerExtra is an R package for image processing based on imager.
https://github.com/shotaochi/imagerextra

image-processing imager r

Last synced: about 1 month ago
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imagerExtra is an R package for image processing based on imager.

Host: GitHub
URL: https://github.com/shotaochi/imagerextra
Owner: ShotaOchi
License: gpl-3.0
Created: 2018-05-24T12:06:40.000Z (over 6 years ago)
Default Branch: master
Last Pushed: 2023-01-04T20:40:46.000Z (almost 2 years ago)
Last Synced: 2024-10-28T17:32:16.262Z (about 2 months ago)
Topics: image-processing, imager, r
Language: C++
Homepage: https://CRAN.R-project.org/package=imagerExtra
Size: 589 KB
Stars: 11
Watchers: 2
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

        # imagerExtra

[![Build Status](https://github.com/ShotaOchi/imagerExtra/workflows/R-CMD-check/badge.svg)](https://github.com/ShotaOchi/imagerExtra/actions)

[![CRAN Version](https://www.r-pkg.org/badges/version/imagerExtra)](https://cran.r-project.org/package=imagerExtra)

[![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)

[![codecov](https://codecov.io/gh/ShotaOchi/imagerExtra/branch/master/graph/badge.svg)](https://codecov.io/gh/ShotaOchi/imagerExtra)

## About

imagerExtra is an R package for image processing based on the R package [imager](https://github.com/dahtah/imager).

imagerExtra provides advanced functions for image processing.

See the vignette [Getting Started with imagerExtra](https://cran.r-project.org/package=imagerExtra/vignettes/gettingstarted.html) to know what functions imagerExtra provides. 

See the [introduction of imager](http://dahtah.github.io/imager/) if you don't know imager.

See the [vignette of imager](https://CRAN.R-project.org/package=imager/vignettes/gettingstarted.html) if you aren't familiar with imager.

## Installation

You can install imagerExtra from CRAN or GitHub.

Run the following R code to install imagerExtra.

```r

# install from CRAN

install.packages("imagerExtra")

# install from GitHub

devtools::install_github("ShotaOchi/imagerExtra")

```

## Optical Character Recognition (OCR)

You need the R package [tesseract](https://github.com/ropensci/tesseract#tesseract) to do OCR with imagerExtra.

See the [installation guide of tesseract](https://github.com/ropensci/tesseract#installation) if you haven't installed tesseract.

Here is a small demo that shows imagerExtra can expand the scope of the application of tesseract.

```r

library(imagerExtra)

# OCR doesn't work well for degraded images

plot(papers)

OCR(papers)

# OCR works well for images with high contrast and little noise

hello <- DenoiseDCT(papers, 0.01) %>% ThresholdAdaptive(., 0.1, range = c(0,1))

plot(hello)

OCR(hello)

```

## Contribution

You can create issues for any bug report or suggestion on the [issues page](https://github.com/ShotaOchi/imagerExtra/issues).

You're welcome to fork this repository and send me a pull request for bug fixes or additional features.

## Development Blog

URL of development blog of imagerExtra is [https://shotaochi.github.io/](https://shotaochi.github.io/).