cv-convert: Convert computer vision data types in Rust

Type conversions among famous Rust computer vision libraries. It supports the following crates:

reference: https://github.com/jerry73204/rust-cv-convert

• image
• imageproc
• nalgebra
• opencv
• tch
• ndarray

Usage

Run cargo add cv-convert to add this crate to your project. In the default setting, up-to-date dependency versions are used.

If you desire to enable specified dependency versions. Add default-features = false and select crate versions as Cargo features. For example, the feature nalgebra_0-30 enables nalgebra 0.30.x.

[dependencies.cv-convert]
version = 'x.y.z'  # Please look up the recent version on crates.io
default-features = false
features = [
    'image',
    'opencv',
    'tch',
    'nalgebra',
    'ndarray',
]

The minimum supported rustc is 1.81. You may use older versions of the crate (>=0.6) in order to use rustc versions that do not support const-generics.

Cargo Features

opencv

• opencv 0.93

image

• image 0.25

imageproc

• imageproc 0.25

ndarray

• ndarray 0.16

nalgebra

• nalgebra 0.33

tch

• tch 0.13

Usage

The crate provides FromCv, TryFromCv, IntoCv, TryIntoCv traits, which are similar to standard library's From and Into.

use cv_convert::{FromCv, IntoCv, TryFromCv, TryIntoCv};
use nalgebra as na;
use opencv as cv;

// FromCv
let cv_point = cv::core::Point2d::new(1.0, 3.0);
let na_points = na::Point2::<f64>::from_cv(&cv_point);

// IntoCv
let cv_point = cv::core::Point2d::new(1.0, 3.0);
let na_points: na::Point2<f64> = cv_point.into_cv();

// TryFromCv
let na_mat = na::DMatrix::from_vec(2, 3, vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0]);
let cv_mat = cv::core::Mat::try_from_cv(&na_mat)?;

// TryIntoCv
let na_mat = na::DMatrix::from_vec(2, 3, vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0]);
let cv_mat: cv::core::Mat = na_mat.try_into_cv()?;

Contribute to this Project

Add a new dependency version

To add the new version of nalgebra 0.32 for cv-convert for example, open cv-convert-generate/packages.toml in the source repository. Add a new version to the list like this.

[package.nalgebra]
versions = ["0.26", "0.27", "0.28", "0.29", "0.30", "0.31", "0.32"]
use_default_features = true
features = []

Run make generate at the top-level directory. It modifies Rust source files automatically. One extra step is to copy the snipplet in cv-convert/generated/Cargo.toml.snipplet and paste it to cv-convert/Cargo.toml.

Add a new type conversion

To add a new type conversion, take image::DynamicImage and opencv::Mat for example. Proceed to cv-convert/src and implement the code in with_opencv_image.rs because it is a conversion among opencv and image crates.

Choose FromCv or TryFromCv trait and add the trait implementation on image::DynamicImage and opencv::Mat types. The choice of FromCv or TryFromCv depends on whether the conversion is fallible or not.

impl FromCv<&image::DynamicImage> for opencv::Mat { /* omit */ }
impl FromCv<&opencv::Mat> for image::DynamicImage { /* omit */ }

// or

impl TryFromCv<&image::DynamicImage> for opencv::Mat { /* omit */ }
impl TryFromCv<&opencv::Mat> for image::DynamicImage { /* omit */ }

#[cfg(test)]
mod tests {
    // Write a test
}

License

MIT license. See LICENSE file.