A fingerprint image segmentation algorithm based on frequency of gray scale and 8-direction image is proposed.

提出基于灰度值频数和遍历八方向的指纹图像分割算法。

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In this paper, we studied the algorithms of fingerprint image enhancement and put forward a new method to calculate the direction image.

文章研究了目前的指纹图像增强算法，提出了一种新的指纹方向场的动态计算方法。

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This paper presents an algorithm which directly computes the direction image on the gray level images. Experimental results show that it is feasible for fingerprint processing.

该文介绍了一种直接利用指纹灰度信息进行指纹图像方向图计算的方法，实验结果表明，它是行之有效的。

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They are perforated, to resemble the punched paper tape Tutte was so familiar with, and when viewed from one particular direction reveal an image of Tutte's head and shoulders.

BBC: Suffolk

Optical correlators, meanwhile, work by encoding images on to a beam of light and, using a special lens, transforming them into their Fourier components building-blocks that encode the thickness and direction of lines in the image, but not their position.

ECONOMIST: Optical recognition

But traditional holograms appear distorted if the viewer is not looking at the image from the right direction.

FORBES: Magazine Article