Module gradient

Helper function to compute gradients

Functions

bloc_squared_norm

Gradient squared norm in a 2x2 pixels block.

bloc_x

Horizontal gradient in a 2x2 pixels block.

bloc_y

Vertical gradient in a 2x2 pixels block.

centered

Compute a centered gradient.

squared_norm

Compute squared gradient norm from x and y gradient matrices.

squared_norm_direct

Compute squared gradient norm directly from the image.