Function radon_heatmap_image 

pub fn radon_heatmap_image(
    img: &GrayImage,
    cfg: &DetectorConfig,
) -> Result<ResponseMap, ChessError>

Compute the Radon response heatmap from an image::GrayImage.

Convenience wrapper over radon_heatmap_u8 when the image feature is enabled.

Errors

Returns ChessError::Upscale if the upscale configuration in cfg is invalid. A dimension mismatch is not possible for GrayImage since the image crate guarantees as_raw().len() == width * height.