Claims
- 1. A system for correcting raster data for spatial non-uniformities within an image, comprising:
a sensor for detecting a plurality of the raster data as a function of respective positions within the image; a processor, which receives the raster data from the sensor, for processing the raster data to correct the spatial non-uniformities in the image; and a memory device for storing a set of tone reproduction curves, respective ones of the tone reproduction curves being accessed by the processor as a function of the positions of the raster data for generating respective correction values to compensate for the non-uniformities, the processor applying the correction values to the respective raster data for generating corrected raster data.
- 2. The system for correcting raster data as set forth in claim 1, wherein the memory device includes:
a correction lookup table indexing the tone reproduction curves as a function of the respective positions within the image.
- 3. The system for correcting raster data as set forth in claim 1, wherein the raster data represents reflectance, a number of reflectance sub-ranges being defined between a minimum reflectance and a maximum reflectance, each of the reflectances in the raster data being included within one of the reflectance sub-ranges, each of the tone reproduction curves representing one of the reflectance sub-ranges.
- 4. The system for correcting raster data as set forth in claim 3, wherein sixteen (16) sub-ranges are defined between the minimum reflectance and the maximum reflectance.
- 5. The system for correcting raster data as set forth in claim 1, further including:
an output device for rendering the corrected raster data.
- 6. The system for correcting raster data as set forth in claim 5, wherein the output device includes a color printing device.
Parent Case Info
[0001] This is a divisional of U.S. application Ser. No. 09/738,573 filed Dec. 15, 2000 by the same inventors, and claims priority therefrom.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09738573 |
Dec 2000 |
US |
Child |
10812545 |
Mar 2004 |
US |