cv-convert: Convert computer vision data types in Rust

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

• 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_0-24',
    'opencv_0-84',
    'tch_0-13',
    'nalgebra_0-32',
    'ndarray_0-15',
]

The minimum supported rustc is 1.51. 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_0-84
• opencv_0-83
• opencv_0-82
• opencv_0-81
• opencv_0-80
• opencv_0-79
• opencv_0-78
• opencv_0-77
• opencv_0-76
• opencv_0-75
• opencv_0-74
• opencv_0-73
• opencv_0-72
• opencv_0-71
• opencv_0-70
• opencv_0-69
• opencv_0-68
• opencv_0-67
• opencv_0-66
• opencv_0-65
• opencv_0-64
• opencv_0-63

image

• image_0-24
• image_0-23

imageproc

• imageproc_0-23

ndarray

• ndarray_0-15

nalgebra

• nalgebra_0-32
• nalgebra_0-31
• nalgebra_0-30
• nalgebra_0-29
• nalgebra_0-28
• nalgebra_0-27
• nalgebra_0-26

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.