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1. WO2001080150 - PROCEDE PERMETTANT DE PRODUIRE DES CARTES POSTALES ELECTRONIQUES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims

1. Method of producing, sending and displaying handwritten electronic postcards by means of electronic data processing equipment, said postcard having a first and a second information page (1,2), the first information page (1) containing an electronically registered colour image and the second information page (2) containing an electronically registered colour image of a substantially rectangular white surface (8), whose surface normal not necessarily is parallel to the surface normal of the focal plane of the colour image, said rectangular surface comprising four register marks (4) positioned in the corners of said rectangular and a centrally arranged frame (7) able to contain a handwritten message, c h a r a c t e r i s e d in that the presence of the four register marks (4) is detected by means of the equipment, the brightness, contrast, colour and position of the register marks (4) being measured, that the colour image of the white surface (8) subsequently is transformed by means of the measured positions of the register marks (4) in such a manner that the register marks (4) form a rectangle, and further that the brightness, contrast and colour of the transformed electronic colour image is adjusted dynamically in relation to the transformed colour image by means of the measured brightness, contrast, and colour, and that the transformed adjusted colour image is trimmed so as to substantially only comprise the centrally arranged frame (7), and that finally the end result is stored together with the first information page (1) as an electronic postcard on the electronic data processing equipment.

2. Method according to claim 1, c h a r a c t e r i s e d in that the detection of the four register marks comprises the following steps:

- generating a grey scale image of the colour image (8) of the other information page,

- generating and storing a number of copies of the grey scale image, each copy having a progressively lower resolution,

- starting with the copy having the lowest resolution, searching each of said copies to locate the positions of the four register marks (4) in each resolution, a correlation measure for corresponding pixels between the individual copies being used,

- comparing the positions of the four register marks (4) on the copies with a number of a predefined, stored register mark position sets (4'), each register mark position set (4') corresponding to a specific perspective angle, and

- rendering a warning signal, if the detected difference between the stored register mark position sets (4') and the register mark positions (4) of the copies exceeds a predetermined threshold value.

3. Method according to claim 1 or 2, c h a r a c t e r i s e d in that the transformation of the colour image of the white surface (8) comprises a division of the quadrangle defined by the four detected register marks (4) into at least two triangles and a subsequent affine transformation of the colour image of the white surface (8) by means of the located register mark positions (4) such that the quadrangle substantially forms a rectangle after the transformation.

4. Method according to claim l,char acterised in that the transformation of the colour image of the white surface (8) is determined directly by means of the detected register mark positions (4) such that the quadrangle substantially forms a rectangle after the transformation, said transformation determination being performed by solving an equation for the perspective projection of the detected register mark positions.

5. Method according to one of the claims 1-4, characterised in that the adjustment of the brightness, contrast and colour of the transformed colour image involves a measurement of the lighting conditions for each of the four register marks (4) and a subsequent exposure compensation, a linear stretch and limitation algorithm and a bilinear inteφolation being carried out on the pixels between the register marks, and further that a suitable colour correction is carried out on the colour image obtained by the exposure compensation so as to reduce any flaws, which may have been enhanced by the exposure compensation

6. Method according to one or more of the claims 1-5, c h a r a c t e r i s e d in that the storage of the first and second information pages (1 ,2) of the electronic postcard is performed such that the first information page (1) is publicly displayed, while the second information page (2) only is displayed when a unique access code for the electronic postcard is entered.