Back to results
US 7,609,878 B2Granted
Method for analyzing the color deviations in images using an image sensor
AssigneeKoenig & Bauer Aktiengesellschaft
InventorsVolker Lohweg, Harald Heinrich Willeke
Life of this patent
Estimating the term…
Abstract
Color deviations of images are analyzed using a sensor. The received image sensor signal is analyzed pixel by pixel. An image sensor signal is produced for each color channel from a plurality of color channels. An image sensor signal from a first channel, and one from a second channel, are combined. An output signal of a first color contrast channel is generated. Now an image sensor signal from a third channel is combined with the ones from the first and second image sensors. An output signal of a second color contrast channel is generated. The outputs of these color contrast channels are classified.
Claims14
A method for analyzing color deviation of printed images including:
- providing a printed image;
- providing a printed image sensor;
- using said printed image sensor for generating separate pixel by pixel image sensor signals of each of first, second and third color channels of said printed image;
- providing said first, second and third color channels as red, green and blue color channels, respectively, said first, second and third color channels reproducing color perceptions generated in a human eye;
- providing a separate printed image sensor signal for each of said first, second and third separate color channels;
- providing a first calculation specification consisting of at least a first arithmetic rule;
- linking said first color channel printed image sensor signal with said second color channel printed image sensor signal by using said first calculation specification;
- generating a first printed image output signal of a first resultant compensation color channel representing a red/green receptive field of color perception of a human eye using said first calculation specification linked first and second color channel image sensor signals;
- providing a second calculation specification consisting of at least a second arithmetic rule;
- linking said third color channel image sensor signal with a combination of said first and second color channel image sensor signals by using said second calculation specification;
- generating a second printed image output signal of a second resultant compensation color channel representing a blue/yellow receptive field of color perception of a human eye using said second calculation specification linked third color channel image sensor signal and said combination of said first and second color channel image signals;
- selecting said first calculation specification for forming a weighted difference between said second color channel image sensor signal and said first color channel image sensor signal corresponding to a first color perception of a human eye;
- selecting said second calculation specification for forming a weighted difference between said combination of said first color channel image sensor signal and said second color channel image sensor signal, and said third color channel image sensor signal corresponding to a second color perception of a human eye;
- providing at least one reference image;
- generating first and second reference image output signals of first and second reference image compensation channels;
- providing a reference memory and storing said first and second reference image output signals of said first and second reference image compensation channels in said reference memory;
- storing said first and second printed image output signals of said first and second printed image compensation changes in said reference memory;
- providing a classification system;
- using said classification system for comparing said first and second reference image output signals with said first and second printed image output signals in said reference memory;
- classifying said first and said second output signals of said first and second compensation color channels, representing said receptive fields of color perception of a human eye using said classification system;
- and
- determining an acceptability of said human eye color perception of said printed image based on said classification of said first and second printed image output signals with said first and second reference image output signals performed in said classification system.
19 more elements
A method for analyzing color deviation of printed images including:
- providing a printed image;
- providing a printed image sensor;
- using said printed image sensor for generating separate pixel by pixel image sensor signals of each of first, second and third color channels of said printed image;
- providing said first, second and third color channels as red, green and blue color channels, respectively, said first, second and third color channels reproducing color perceptions generated in a human eye;
- providing a separate printed image sensor signal for each of said first, second and third separate color channels;
- providing a first calculation specification consisting of at least a first arithmetic rule;
- linking said first color channel printed image sensor signal with said second color channel printed image sensor signal by using said first calculation specification;
- generating a first printed image output signal of a first resultant compensation color channel representing a red/green receptive field of color perception of a human eye using said first calculation specification linked first and second color channel image sensor signals;
- providing a second calculation specification consisting of at least a second arithmetic rule;
- linking said third color channel image sensor signal with a combination of said first and second color channel image sensor signals by using said second calculation specification;
- generating a second printed image output signal of a second resultant compensation color channel representing a blue/yellow receptive field of color perception of a human eye using said second calculation specification linked third color channel image sensor signal and said combination of said first and second color channel image signals;
- selecting said first calculation specification for forming a weighted difference between said second color channel image sensor signal and said first color channel image sensor signal corresponding to a first color perception of a human eye;
- selecting said second calculation specification providing a linkage of a minimum one of the first color channel image sensor signal and the second color channel image sensor signal, with said third color channel image sensor signal corresponding to a second color perception of a human eye;
- providing at least one reference image;
- generating first and second reference image output signals of first and second reference image compensation channels;
- providing a reference memory and storing said first and second reference image output signals of said first and second reference image compensation channels in said reference memory;
- storing said first and second printed image output signals of said first and second printed image compensation changes in said reference memory;
- providing a classification system;
- using said classification system for comparing said first and second reference image output signals with said first and second printed image output signals in said reference memory;
- classifying said first and said second output signals of said first and second compensation color channels, representing said receptive fields of color perception of a human eye using said classification system;
- and
- determining an acceptability of said human eye color perception of said printed image based on said classification of said first and second printed image output signals with said first and second reference image output signals performed in said classification system.
19 more elements
Dependencies are inferred from the claim text.