1) curves of gray-level projection
灰度投影曲线
1.
Firstly,the eye area is identified from the face image based on the curves of gray-level projection and geometrical characteristics of human face;then the obtained eyes area is compared with the preparative eye template to judge whether the eye is closed or not.
首先基于灰度投影曲线和人脸几何特点提取驾驶员的眼部区域,然后利用事先提取的驾驶员睁眼时的瞳孔区域模板在该区域进行匹配,通过匹配初步判断出驾驶员是否属于疲劳驾驶。
2) projective length curve
投影长度曲线
1.
First,the vertical section projective silhouette images of little convex polyhedrons taken in every parallel rotary angle were processed,and the corresponding set of silhouette sequences and the set of cross section projective length curves were acquired.
首先处理被测小凸多面物体各平行旋转角度下纵投影轮廓图像,得到对应轮廓序列集及横截面切片投影长度曲线集,然后由该曲线集得到所有疑似被测物体表平面的索引,将该索引对照各轮廓序列进行筛选,最后经计算得到被测物体的各表平面参数,完成面形重建。
3) gray projection
灰度投影
1.
Automatic segmentation for video objects based on gray projection and Fisher criterion;
灰度投影结合Fisher准则的对象分割
2.
Electronic image stabilization for railway crossing video based on gray projection
基于灰度投影的铁路道口视频电子稳像
3.
Then the gray projection and circle equation are used to detect the iris inner edge accurately.
对于虹膜的内边缘定位,本文基于图像二值化和形态学的腐蚀、膨胀,建立了有效的去噪算法,并提出了一种灰度投影与圆的方程相结合的方法,可准确定位虹膜内边缘。
4) Gray-level Projection
灰度投影
1.
The gray-level projection methods to locate eyebrow regions was adopted,the human iris saturation information was used to locate eyes accurately.
为提高人眼定位的鲁棒性、准确性和检测速度,以改善算法的适用性,提出了一种基于YCbCr彩色空间的肤色信息和基于水平灰度投影与HIS彩色空间的人眼虹膜饱和度信息相结合的算法。
5) Intensity projection
灰度投影
1.
The intensity projection method can reduce the image sequences from three-dimensional signals to two-dimensional signals,and also the noises of compressed signals still can be eliminated by Gaussian filter.
灰度投影法可将时空域内的图像序列由三维信号压缩为二维信号来处理,且压缩后的信号噪声仍能通过高斯滤波来消除;之后计算灰度投影向量的时空离散度,并采用水线阈值分割技术查找离散度曲线的波峰,从而确定运动目标所在位置,实现运动目标的快速检测。
6) projective curve
投影曲线
1.
In order to guarantee the quality of surface finish machining and reduce the work volume in the subsequent processes,the paper proposes an error-controllable direct interpolation algorithm of projective curves on sculptured surfaces.
为保证曲面精加工质量的一致性,减轻后续处理工作量,提出了一种误差可控的复杂曲面上投影曲线的直接插补算法。
补充资料：滤波反投影或卷积反投影
滤波反投影或卷积反投影
影像学术语。当代影像学设备进行影像重建的数学方法。在直接用扫描后所获得的投影轨迹剖面图反投影重建出的CT图像中，无法避免角度卷入条纹伪影(angular aliasing streaks)造成的模糊和失真。这种现象与被扫描层面的空间频率中高频信息的损失有关。使用一种精密的数学方法去除这种模糊。称为“展现”(unfolding)或去卷积(deconvolution)，即在反投影前使用一种数学的“滤器”或卷积函数对原始数据进行修正，然后再进行反投影。两步数学处理过程合称为滤波(修正后)反投影或卷积(后)反投影。这种方法的优点是处理过程简单，速度快，所得图像逼真、清晰。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条