Iris verification method

An iris verification method, comprising:

• receiving images captured with a lighting unit of an iris capturing apparatus turned on and images captured with the lighting unit turned off;
• calculating radius ratios of the received images, wherein the radius ratios are pupil radius-to-iris radius ratios;
• calculating radius ratio change rates by sequentially and alternately comparing the radius ratios of the images captured with the lighting unit turned on and the radius ratios of the images captured with the lighting unit turned off;
• indexing the radius ratio change rates and calculating an average of the indexed radius ratio change rates;
• and
• verifying the iris to be authenticated by comparing the average of the indexed radius ratio change rates with a predefined first threshold value and comparing a ratio of a minimum radius ratio change rate to a maximum radius ratio change with a predefined second threshold value,
• wherein the obtaining the indexed radius ratio change rates and the calculating the average of the indexed radius ratio change rates, comprise obtaining the indexed radius ratio change rates using the following equation:
• In=|1−Cn|
• where In denotes indexed radius ratio change rate and Cn denotes radius ratio.