Function stereo_block_match 

pub fn stereo_block_match<T>(
    left: ImageView<'_, T, 1>,
    right: ImageView<'_, T, 1>,
    options: StereoBmOptions,
) -> Result<Image<f32, 1>, VisionError>
where
    T: PixelComponent,

Dense SAD block matching on already-rectified grayscale stereo images.

Invalid disparities are set to INVALID_DISPARITY. Search looks for matches of the left pixel in the right image at x - d.