OpenCV alternatives and similar libraries

Based on the "Image Processing" category.
Alternatively, view OpenCV alternatives based on common mentions on social networks and blogs.

tesseract-ocr

9.9 9.7 L1 OpenCV VS tesseract-ocr

Tesseract Open Source OCR Engine (main repository)
libvips

8.6 9.5 L3 OpenCV VS libvips

A fast image processing library with low memory needs.

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OpenMVG (open Multiple View Geometry)

8.6 7.8 OpenCV VS OpenMVG (open Multiple View Geometry)

open Multiple View Geometry library. Basis for 3D computer vision and Structure from Motion.
VTK

7.7 9.9 L1 OpenCV VS VTK

Mirror of Visualization Toolkit repository
OpenImageIO

6.9 9.5 L1 OpenCV VS OpenImageIO

Reading, writing, and processing images in a wide variety of file formats, using a format-agnostic API, aimed at VFX applications.
OpenEXR

6.8 9.0 L1 OpenCV VS OpenEXR

The OpenEXR project provides the specification and reference implementation of the EXR file format, the professional-grade image storage format of the motion picture industry.
ITK

6.6 9.8 L2 OpenCV VS ITK

Insight Toolkit (ITK) -- Official Repository. ITK builds on a proven, spatially-oriented architecture for processing, segmentation, and registration of scientific images in two, three, or more dimensions.
Magick++

6.1 2.9 OpenCV VS Magick++

Go binding to ImageMagick's MagickWand C API
CImg

5.9 9.2 OpenCV VS CImg

The CImg Library is a small and open-source C++ toolkit for image processing
GD

5.5 9.6 L2 OpenCV VS GD

GD Graphics Library
Video++

5.0 0.0 L2 OpenCV VS Video++

Video++, a C++14 high performance video and image processing library.
VIGRA

4.6 3.5 L1 OpenCV VS VIGRA

a generic C++ library for image analysis
hiptext

4.4 1.6 L3 OpenCV VS hiptext

Turn images into text better than caca/aalib
SVG++

4.1 2.4 L3 OpenCV VS SVG++

C++ SVG library
GDCM

4.0 7.1 L1 OpenCV VS GDCM

Grassroots DICOM read-only mirror. Only for Pull Request. Please report bug at http://sf.net/p/gdcm
Boost.GIL

3.6 6.0 L3 OpenCV VS Boost.GIL

Boost.GIL - Generic Image Library | Requires C++11 since Boost 1.68
CxImage

3.2 0.0 L1 OpenCV VS CxImage

An image processing and conversion library to load, save, display, transform BMP, JPEG, GIF, PNG, TIFF, MNG, ICO, PCX, TGA, WMF, WBMP, JBG, J2K images. [zlib]
FreeImage

2.4 0.0 L2 OpenCV VS FreeImage

A custom distribution of FreeImage, with a CMake-based build system. Used by the Athena Game Framework.
ULIS

1.6 9.7 OpenCV VS ULIS

Utility Library for Imaging Systems
DCMTK

- OpenCV VS DCMTK

DICOM Toolkit.