Function imageproc::integral_image::sum_image_pixels

pub fn sum_image_pixels<P>(
    integral_image: &Image<P>,
    left: u32,
    top: u32,
    right: u32,
    bottom: u32
) -> P::DataType
where
    P: Pixel + ArrayData + Copy,

Sums the pixels in positions [left, right] * [top, bottom] in F, where integral_image is the integral image of F.

The of ArrayData here is due to lack of const generics. This library contains implementations of ArrayData for Luma, Rgb and Rgba for any element type T that implements Primitive. In that case, this function returns [T; 1] for an image whose pixels are of type Luma, [T; 3] for Rgb pixels and [T; 4] for Rgba pixels.

See the integral_image documentation for examples.