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.

toml [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.

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

// FromCv let cvpoint = cv::core::Point2d::new(1.0, 3.0); let napoints = na::Point2::::fromcv(&cvpoint);

// IntoCv let cvpoint = cv::core::Point2d::new(1.0, 3.0); let napoints: na::Point2 = cvpoint.intocv();

// TryFromCv let namat = na::DMatrix::fromvec(2, 3, vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0]); let cvmat = cv::core::Mat::tryfromcv(&namat)?;

// TryIntoCv let namat = na::DMatrix::fromvec(2, 3, vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0]); let cvmat: cv::core::Mat = namat.tryintocv()?; ```

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.

toml [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.

```rust 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.