Compressed image data enhancement
First Claim
Patent Images
1. A method for processing compressed image data, comprising:
- decoding compressed image data one block at a time to generate decoded blocks;
stretching first values of the decoded blocks; and
encoding decoded blocks with stretched-first values replacing corresponding first values to generate background removed compressed image data.
1 Assignment
0 Petitions
Accused Products
Abstract
An image background remover is disclosed that performs background removal of JPEG (Joint Photographic Experts Group) compressed image data without first performing a complete decompression of the compressed image data.
12 Citations
20 Claims
-
1. A method for processing compressed image data, comprising:
-
decoding compressed image data one block at a time to generate decoded blocks;
stretching first values of the decoded blocks; and
encoding decoded blocks with stretched-first values replacing corresponding first values to generate background removed compressed image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A program stored in a machine readable medium, transmitted by a transmitter or received by a receiver, the program executed by a machine to perform a process, comprising:
-
decoding compressed image data one block at a time to generate decoded blocks;
stretching first values of the decoded blocks; and
encoding decoded blocks with stretched first values replacing corresponding first values to generate background removed compressed image data. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. An apparatus that processes compressed image data, comprising:
-
means for locating first values corresponding to luminance in the compressed image data;
means for reading the first values;
means for selecting a compressed luminance block in the compressed image data;
means for decoding the compressed luminance block into quantized luminance coefficients;
means for converting a quantized DC coefficient of the quantized luminance coefficients to a quantized-stretched DC coefficient;
means for replacing the quantized DC coefficient in the quantized luminance coefficients with the quantized-stretched DC coefficient to obtain modified quantized-luminance coefficient blocks; and
means for encoding the modified quantized-luminance coefficient blocks to obtain compressed modified luminance blocks.
-
Specification