Patent ID: 9118870
Filing Date: 2015-08-25
Classification: H04N

Abstract:
1. A method for rendering a color shift image pattern on a recording medium, comprising: (a) creating, in a pre-defined image region, an image pattern including a first pattern having a first color and a second pattern having a second color, the first pattern having a width smaller than the second pattern, the first color being different from the second color; and (b) rendering, using marking materials, the image pattern on a recording medium, the marking materials used to render the first color having a first top surface and a first bottom surface, the first bottom surface of the marking materials used to render the first color engaging the recording medium, the marking materials used to render the first color having a first height, the first height being a distance between the first top surface and the first bottom surface, the marking materials used to render the second color having a second top surface and a second bottom surface, the second bottom surface of the marking materials used to render the second color engaging the recording medium, the marking materials used to render the second color having a second height, the second height being a distance between the second top surface and the second bottom surface, the second height of the marking materials used to render the second color being greater than the first height of the marking materials used to render the first color such that the first pattern and the second pattern are visible when a relative angle between an observer's viewing angle and an angle of illuminating the recording medium by an illumination source is a first angle, and the first pattern is not visible when the relative angle between the observer's viewing angle and the angle of illuminating the recording medium by the illumination source is a second angle, the second angle being not equal to the first angle.