| 摘要 |
<p>A method of monitoring the suitability of an image of a skin pattern for use in a subsequent verification or identification process, comprises: a) irradiating a region in which a skin pattern is expected; b) detecting the intensity of radiation from the irradiated region; c) comparing the detected intensity with a first threshold; d) if the detected intensity is greater than the first threshold, detecting the intensity after a predetermined time interval and comparing the second detected intensity with a second threshold defining an intensity greater than that of the first threshold; and e) generating at least a preliminary acceptance signal if the second intensity exceeds the second threshold.</p> |
