Function separable_filter_f32 

pub fn separable_filter_f32<T: PixelComponent, const CHANNELS: usize>(
    input: ImageView<'_, T, CHANNELS>,
    kernel_x: &Kernel1D,
    kernel_y: &Kernel1D,
    delta: f64,
    border: BorderMode<T, CHANNELS>,
) -> VisionResult<Image<f32, CHANNELS>>

Applies separable kernels and preserves signed/fractional output as f32.