waifu2x is an image scaling and noise reduction program for anime-style art and other types of photos.

[1] waifu2x was inspired by Super-Resolution Convolutional Neural Network (SRCNN).

[2][3] It uses Nvidia CUDA for computing,[4] although alternative implementations that allow for OpenCL[5] and Vulkan[6] have been created.

Waifu (from the Japanese pronunciation of "wife") is anime slang for a female character to whom one is attracted.

2x means two-times magnification.