초록 ▼

A method of hiding a pattern in a host image increases and decreases parameter values at randomly selected host image locations assigned to respective first and second groups. The alteration modifies the statistical behavior of a test statistic equivalent to a linear combination of a large number of

A method of hiding a pattern in a host image increases and decreases parameter values at randomly selected host image locations assigned to respective first and second groups. The alteration modifies the statistical behavior of a test statistic equivalent to a linear combination of a large number of instances of respective functions, associated with the pattern, of the parameter values at first and second group locations. The presence or absence of the pattern in a test image is determined by comparing the experimental value of the test statistic associated with the pattern with the expected value of the same sum for an unaltered host image.

대표청구항 ▼

A method of embedding data in an image encoded as points, each point having a parameter value, the method comprising the steps of: a. generating an ordered series of pseudo-random numbers; b. assigning each pseudo-random number of the series to a first or a second group; c. associating each pseudo-r

A method of embedding data in an image encoded as points, each point having a parameter value, the method comprising the steps of: a. generating an ordered series of pseudo-random numbers; b. assigning each pseudo-random number of the series to a first or a second group; c. associating each pseudo-random number with a point; d. designating each point associated with a pseudo-random number assigned to the first group to be a first point each point associated with a pseudo-random number assigned to the second group to be a second point; and e. altering the image by i. increasing the parameter value of each first point and of a first patch of points surrounding each first point and ii. decreasing the parameter value of each second point and of a second patch of points surrounding each second point, thereby embedding data in the image.