Patent ID: 7305147

Claim:
A zoom method for zooming onto a part of an image which includes pixels and which represents a terrain overflown by an aircraft comprising the steps of: modulating an image, pixel by pixel, by a shading cue representative of the relief of a terrain, determining said shading cue being by way of a computation carried out, in a reference frame of a display screen of an aircraft, pixel by pixel, on the basis of a altitudes of pixels neighboring the current pixel in the case of the unzoomed image, characterized in that, in the case of an image zoomed with a zoom factor whose value belongs to a given span distinct from the span to which a unit zoom factor belongs, the latter corresponding to an unzoomed image, the shading cue is determined by way of said computation carried out on the basis of the altitudes of pixels which are more remote from the current pixel than the neighboring pixels, by a remoteness factor whose value belongs to said given span.