查询词典 biconvex

First,skin regions are detected based on YCbCr model of skin color;each block is morphologically processed in order to smooth out the biconvex and small backdate and to fill holes.Then,skin regions are segmented.At last,a disk template is used to find the location of eye and mouth.

方法首先根据YCbCr肤色模型检测出肤色区域；用数学形态学的膨胀和腐蚀方法进行肤色处理，平滑了边界，同时消除了肤色块的连通；再利用圆盘结构元素对人脸区域做闭运算，从而得到人眼和嘴的位置。

Achenes trigonous or biconvex, rarely biconcave.

瘦果三棱或者两面凸，很少两面凹。

However, it does not indicate that the biconvex Fresenl lens has advantages in all applications since it is application dependent. Therefore, Fresenl lenses should have different parameters for different applications.

但这不表明曲面菲涅尔透镜在像差方面一定比平面菲涅尔透镜更具优势，它还与实际应用场合有关，为此，提出了不同的结构参数设计。

Generally, the Fresenl lens is used for collimation and its structure is planeconvex, but the analysis and comparison of the biconvex and the plane-convex Fresenl lenses with P-W method show that the biconvex Fresenl lens is better because of its specific imaging requirement. The two kinds of the Fresenl lenses were modeled in ZEMAX to validate the conclusion.

从应用角度看，菲涅尔透镜设计属于准直系统，一般采用平面结构，但由于其成像要求的特殊性，通过运用P-W方法进行分析和比较，结果表明：曲面的设计较之于平面更具优势，并在ZEMAX中分别对2种菲涅尔透镜进行建模，验证了结果的正确性。

This article outlines the progress of ancient Chinese lenses from the Pre-Qin Period to the Five Dynasties, and discusses mainly two arguments: First, the"yangsui" recorded and narrated in Lun Heng by Wang Chong of Eastern Han Dynasty may be a plano-convex glass lens; secondly, the"four mirrors" recorded and narrated in Tanzi Hua Shu by Tan Qiao of Southern Tang Dynasty may be a plano-convex lens, a biconvex lens, a transparent planeparallel plate and a concave-convex lens respectively, but what kind of tra...

本文概述了中国古代透镜从先秦到五代的发展进程，着重从古代文献和出土文物的研究出发，结合中国古代社会经济发展水平，论证了东汉王充《论衡》中记述的阳燧可能是玻璃平凸透镜；论证了南唐谭峭的《谭子化书》中记述的"四镜"可能是平凸透镜、双凸透镜、平光镜和凹凸透镜。作者认为《谭子化书》"四镜"段可能实际上是对中国古代透镜发展的阶段性总结。

Shaped like a biconvex lens .

由目镜产生放大图像的大的凹透镜。

Brown, round, biconvex, film-coated tablet impressed with "IRESSA 250" on one side and plain on the ther .

布朗轮， biconvex ，薄膜包衣片的印象"易瑞沙250 "一方和平原的存在。

Presentation Brown, round, biconvex, film-coated tablet impressed with "IRESSA 250" on one side and plain on the ther .

使用说明布朗轮， biconvex ，薄膜包衣片的印象"易瑞沙250 "一方和平原的存在。

IRESSA tablets are supplied as round, biconvex, brown film-coated tablets intagliated with "IRESSA 250" on one side and plain on the other side, each containing 250 mg of gefitinib.

易瑞沙片供应作为一轮， biconvex ，棕色薄膜包衣片intagliated与"易瑞沙250 "，另一面平原的另一边，每个250毫克的吉非替尼。

IRESSA tablets are supplied as round, biconvex, brown film-coated tablets intagliated with "IRESSA 250" on one side and plain on the other side, each containing 250 mg of gefitinib.

易瑞沙片供应作为一轮， biconvex ，棕色薄膜包衣片intagliated与&易瑞沙250 &，另一面平原的另一边，每个250毫克的吉非替尼。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。