INNER CODE UNIT · C

glength

chunquedong/mgp · core/3rd/edtaa3func.c:79

                    glength = sqrt(glength);
                    gx[k]=gx[k]/glength;
                    gy[k]=gy[k]/glength;
                }
            }
        }
    }
    // TODO: Compute reasonable values for gx, gy also around the image edges.
    // (These are zero now, which reduces the accuracy for a 1-pixel wide region
    // around the image edge.) 2x2 kernels would be suitable for this.
}

/*
 * A somewhat tricky function to approximate the distance to an edge in a
 * certain pixel, with consideration to either the local gradient (gx,gy)
 * or the direction to the pixel (dx,dy) and the pixel greyscale value a.
 * The latter alternative, using (dx,dy), is the metric used by edtaa2().
 * Using a local estimate of the edge gradient (gx,gy) yields much better

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