Howarth, David (2025) A Method Of Reading An Optically Readable Security Element Using Illumination Intensity. GB2633438.
Full text not available from this repository.Abstract
method of reading an optically readable security element, using an image capturing device, the method comprising: establishing a relative configuration between the optically readable security element and the image capturing device, such that an illumination intensity gradient is present across the optically readable security element, whereby different regions of the optically readable security element are illuminated with different illumination intensities; reading the optically readable security element using the illumination intensity gradient, such that reading of different regions of the optically readable security element is undertaken with different illumination intensities; determining the relative configuration between the optically readable security element and the image capturing device; during or following reading the optically readable security element, determining a measured response of the optically readable security element to the illumination; and comparing the measured response with an expected response of the optically readable security element to the illumination, the expected response being established based on the determined relative configuration.