CHT：圆形Hough变换

“Circular Hough Transform”通常简称为CHT，这种缩写便于快速书写和在各类场景中使用。该术语在图像处理和计算机视觉等综合领域应用广泛，尤其在检测圆形轮廓时具有重要作用。其对应的中文翻译为“圆形Hough变换”，是一种经典的形状识别算法。

Fast detection of circular pcb mark using Hough transform
Hough变换快速检测圆形PCBMark
We fit the iris to a circle and regard the upper-eyelid as a section of circular arc. Then we use the method of sub-pixel detection to detect sub-pixel edge and the method of Hough transform based on gradient orientation and gradient direction to detect circle.
本文将虹膜用圆来拟合，将上眼睑视为一段圆弧，研究并采用亚像素边缘检测方法检测亚像素级的虹膜边缘和基于梯度朝向和梯度方向信息的Hough变换的方法检测虹膜和眼睑。
According to the circular geometric characteristic of pupil, this paper proposed a fast and effective approach to locate the pupil accurately based on Hough transform to detect circle and thus the other feature points on the eyes ' contour can be selected.
根据瞳孔的圆形几何特征，以Hough变换检测圆的方法为基础，提出一种快速有效的瞳孔精确定位方法，并由此提取眼睛轮廓上的其他各个特征点。
The first one uses a varying and moving circular template to approach the center of finish step by step. The second one is a compound method combing the advantages of many algorithms and mainly based on the principle of Hough transform.
前者使用一个不断移动扩大的圆形模板搜索定位瓶口中心，后者基于霍夫变换原理并吸取了多种算法的优点。

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