Method and device for processing an image in order to construct from a source image a target image with charge of perspective

摘要

A method of processing a digital image in order to construct a calculated image, termed the target image (I*), which represents a so- called source image (I) reconstructed with modifications to the tilting angle, panning angle and scale factor in relation to this source image. This method includes determining a common view point (P), for the source image (I) and the target image (I*), as the origin of an orthonormal reference frame; and calculating, for every pixel (M*) with address (X*, Y*) in the target image (I*), spherical coordinates (&agr;, &bgr;) by a linear function G.sup.-1 such that (&agr;, &bgr;)=G.sup.-1 (X*Y*), the coefficients being functions of the modified tilting and panning angles and scale factor. Finally, the method includes reading a pair (X, Y) which is stored in a table and which constitutes the address of a point (M), in the source image (I), corresponding to the pixel (M*) in the target image (I*), by the matching, to the resolution of the table, the spherical coordinates (&agr;, &bgr;) with one of the addresses (. alpha.. sub.o, &bgr;.sub.o) of the table.