Compression of earth observation satellite images

Details Compression of earth observation satellite images Compression of earth observation satellite images

H - Electricity

04

N

H04N 7/26 (2006.01) B64G 1/10 (2006.01)

Patent

CA 2734944

The invention relates to a method of acquiring, compressing and transmitting satellite images, characterized in that in a systematic manner: an image is acquired (101); (102) said image is processed by an image preprocessing step providing a value characteristic of the image and an image preprocessed by recognizing predetermined natural objects in the acquired image and replacing said natural objects by standard objects; said characteristic value is compared (103) with a table of values, each value of which is associated with a compression algorithm; the compression algorithm corresponding to said characteristic value is implemented (104) by compression means for compressing said image; said compressed image is transmitted (105) to a remote image reception device by transmission means.

L'invention concerne un procédé d'acquisition, de compression et de transmission d'images satellitaires, caractérisé en ce que de manière systématique : une image est acquise (101); (102) cette image est traitée par une étape de prétraitement d'images fournissant une valeur caractéristique de l'image, et une image prétraitée par reconnaissance d'objets naturels prédéterminés dans l'image acquise et remplacement de ces objets naturels par des objets types; ladite valeur caractéristique est comparée (103) à une table de valeurs dont chaque valeur est associée à un algorithme de compression; l'algorithme de compression correspondant à ladite valeur caractéristique est mis en uvre (104) par des moyens de compression pour comprimer ladite image; ladite image comprimée est transmise (105) par des moyens de transmission vers un dispositif distant de réception d'images.

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