Patent ID: 7336401

Claim:
A method of analyzing a printed image, comprising: scanning the printed image; generating an event map for one or more input data blocks in the scanned printed image; determining data statistics of the printed image from at least the event map generated; determining spatial variations in the printed image based on the data statistics; determining a histogram and a frequency distribution based on the data statistics; and determining an image marking process used to create the printed image based on the determined spatial variations, the histogram and the frequency distribution in the printed image, wherein the event map is generated by determining frequency distribution of colors, generating a first color level set, and generating a first binary image by setting dots pixels having the first color level set to 1 otherwise to 0, or by generating a gray value for an image channel, calculating a threshold value for the image channel, generating a second color level set, and generating a second binary image channel by setting point pixels having the second color level set to 1 otherwise 0.