Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO2004061774 - COMPRESSION D'IMAGE COULEUR A PREDICTION ADAPTATIVE

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

[ EN ]

COLOR IMAGE COMPRESSION WITH ADAPTIVE PREDICTION

THE CLAIMS

1. Apparatus for processing an image, the apparatus comprising a machine (410) for accessing a plurality of color caches corresponding to different chromatic contexts ( 4), selecting a color cache for a pixel value being processed (118), and using information in the selected color cache to predict a value for the pixel being processed (120).

2. The apparatus of claim 1 , wherein all color components of the pixel being processed are coded simultaneously.

3. The apparatus of claim 1 , wherein a color cache is selected according to chromatic context from chromatic values of a causal neighborhood of pixels (118).

4. The apparatus of claim 3, wherein information in a selected cache is indexed by using a predicted luminance value for the pixel being processed (120), the predicted luminance value being computed from a causal neighborhood of pixels (119).

5. The apparatus of claim 1 , wherein the machine adds the actual pixel value of the pixel being processed to the selected color cache if the actual pixel value is not already contained within the color cache (126).

6. The apparatus of claim 1 , wherein the machine removes unlikely pixel values from the color caches (126).

7. The apparatus of claim 1 , wherein the machine performs image compression.

8. The apparatus of claim 7, wherein the machine uses a code word to describe an error vector between the predicted value and the actual value of the pixel being processed; and wherein the machine uses a backup coder if the error vector cannot be described by the code word (124).

9. The apparatus of claim 7, wherein the machine predicts an index to the selected color cache for the pixel being processed, determines an actual index in the selected color cache, and uses a code word to describe the error between the predicted and actual indices; and wherein the machine uses a backup coder if the error cannot be computed or described by the code word (124).

10. The apparatus of claim 1 , wherein the machine performs image reconstruction.