H - Electricity – 04 – N
Patent
H - Electricity
04
N
375/36
H04N 5/262 (2006.01) G06T 3/00 (2006.01)
Patent
CA 1228945
-55- ABSTRACT OF THE DISCLOSURE Special effects are produced on video images by means of a method of geometrical transformation which can involve a translation, a rotation, an affine transformation or an effect of perspective. The method consists : - in locating each point of the initial image by means of coordinates (X , Y , O) in a cartesian reference frame designated as a movable reference frame and related to the initial image ; - in representing each point of the initial image by a binary word ; - in storing the initial image in a storage device having two read address inputs and one data output, the function of the device being to deliver a binary word correspond- ing to the point with coordinates (X , Y , O) in the initial image when read address values X and Y are applied respectively to the two inputs : - in causing each point of the transformed image resulting from an initial-image transformation to be located by means of coordinates (X3 , Y3 , O) in a cartesian reference frame which is related to the transformed image and designated as a fixed reference frame ; - in representing each point of the transformed image by a binary word M supplied by the storage device by applying values of X and Y to the read address inputs of the device, these values being computed as a function of the coordinates (X3 , Y3 , O) of said point and as a function of the geometrical transformation parameters.
453681
Chapuis Franck
Nguyen Xuan Kiet
Oyaux Jacques
Goudreau Gage Dubuc
Thomson-Csf
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