| 摘要 |
An advanced low cost adaptive frame grabber is described. Its main area of application is in fingerprint identification and verification systems, but it could successfully be used in other biometric identification systems, such as facial, iris or eye identification and/or verification systems. The invented framegrabber is also very suitable for all applications in other areas, like medical electronics, car electronics etc., where automatic image enhancement and/or transformation from grey scale to line art is required. The adaptive framegrabber automatically estimates the dynamic range of the acquired image and sets up a proper offset and measurement range for a video analog to digital converter (ADC). It could also be operated in two different modes, in one the image is acquired as a full grey scale image, and in the other-as a line art (black and white) image. Full controls over the image size and resolution are provided. |
