Pillow Resize

Table of Contents

• Description
• Compilation
• Installation
• Usage

Description

PillowResize library is a C++ porting of the resize method from the Pillow python library.

It is written in C++ using OpenCV for matrix support

The main difference with respect to the resize method of OpenCV is the use of an anti aliasing filter, that is missing in OpenCV and could introduce some artifacts, in particular with strong down-sampling.

See also blog.

Requirements

The only requirement is OpenCV, so install it from your package manager.

Compilation

git clone --recurse https://github.com/zurutech/pillow-resize.git
cd pillow-resize
git submodule update --init --recursive
mkdir build && cd build
cmake ..
make

Test

If you want to run also the tests, you need to install gtest.

cmake -DBUILD_TESTS=ON ..
make
make test

The tests are based on a pixelwise comparison between the images resized using Pillow from Python and the images created with this library.

Installation

To install PillowResize as a package ensure that you have OpenCV installed system-wide, then simply compile and install.

mkdir build && cd build
cmake ..
sudo make install

Uninstall

To uninstall PillowResize and all the things it brings with it simply run

cd build
sudo make uninstall

Usage

The library uses cmake, hence this library can be added as a subdirectory and built together with your project or use the installed package as a normal CMake package.

Installed package

find_package(PillowResize REQUIRED)

Subdirectory

add_subdirectory(path-to-subdir)

Link

target_link_libraries(your-target PUBLIC PillowResize)

The library defines also the variable PILLOWRESIZE_LIBS, so you can replace PillowResize in the command above with "${PILLOWRESIZE_LIBS}".