초록 ▼

A digital image is subtly changed to permit its subsequent identification, without essentially altering its human appearance. The changes affect only a minority of the image pixels. By checking for the presence of such changes in a suspect image, a suspect image can be matched with the original imag

A digital image is subtly changed to permit its subsequent identification, without essentially altering its human appearance. The changes affect only a minority of the image pixels. By checking for the presence of such changes in a suspect image, a suspect image can be matched with the original image.

대표청구항 ▼

[ We claim:] [1.]1. A method of encoding a digital image to permit its later identification, the image comprising plural pixels, each having a value, the method comprising:receiving an N-bit data string to be embedded in the image, N being at least two, the string comprising bits having first and se

[ We claim:] [1.]1. A method of encoding a digital image to permit its later identification, the image comprising plural pixels, each having a value, the method comprising:receiving an N-bit data string to be embedded in the image, N being at least two, the string comprising bits having first and second values, one of said values being "1" and the other of said values being "0";associating a first bit of said string with a first pixel, a second bit of said string with a second pixel, and so on, so that each bit of said string has a pixel associated therewith;for bits having the first value, changing the values of pixels associated therewith, such changes being essentially imperceptible to a human viewer of the digital image;leaving the values of most of the pixels in the image unchanged;storing the N-bit data string for later reference.