| 摘要 |
<p>Method for scrambling an original digital image (10) into a scrambled image (20) and for descrambling the scrambled image (20) into a reconstructed image (30), the method comprising:
a scrambling operation comprising the steps of:
- receiving the original image (10) having a coding format, this image being divided into successive blocks (11) and being stored in said coding format as a set of syntax elements (12, 13),
- substituting a plurality of syntax elements (12) by replacement syntax elements (12') of the same nature so as to keep the coding format,
- storing the value of the substituted syntax elements (12) with their respective positions within the image (10) as original data (15), into at least two control objects (CO1, CO2), each control object corresponding to a specific degradation level of the original image (10);
a descrambling operation comprising the steps of:
- receiving the scrambled image (20) and said control objects (CO1, CO2),
- selecting at least one of the control objects (CO1, CO2) based on a user access condition (25),
- using said original data (15), stored in the selected control object/objects (CO1, CO2), for obtaining the reconstructed image (30) by retrieving the respective original values of each substituted syntax element (12', 12'') identified by its position.</p> |
