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在介绍图象的压缩编码之前,先考虑一个问题:为什么要压缩?其实这个问题不用我回答, 你也能想得到。因为图象信息的数据量实在是太惊人了。举一个例子就明白:一张 A4(210mm×297mm) 幅面的照片,若用中等分辨率(300dpi)的扫描仪按真彩色扫描,其数据 量为多少?让我们来计算一下:共有(300×210/25.4) ×(300×297/25.4)个象素,每个象素占 3 个字节,其数据量为 26M 字节,其数据量之大可见一斑了
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朱温(852—912),宋州砀山(今属安徽)人。早年参加唐末黄巢起义 军,降唐后唐僖宗赐名朱全忠,建后梁称帝,改名朱晃,庙号太祖。朱温于 唐大中六年(852)十月二十一日生于砀山午沟里。“家世为儒,祖信,父诚, 皆以教授为业”①。长兄全昱,二兄存,朱温排行三。幼年丧父,家贫,其母 王氏就带着他们兄弟佣食于萧县刘崇家
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一、 对大象而言,公园太小了。 二、人类定居于公园外 三、大象喜欢农场的食物 四、大象和奶牛同样需要水
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1 将星球看做绝对黑体,利用维恩位移定律测量 m 便可求得T.这是测量星球表面温度的方 法之一.设测得:太阳的
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具体说来,理论已经解释了这一事实,即就一阶效应而言,介 质和观察者相对于以太的共同速度对现象没有影响3) 但是当涉及二阶效应时,迈克尔逊干涉仪实验4)的否定 结果给理论造成了很大的困难.为了消除这些困难,洛伦兹 和 Fitz-Gerald5各自提出了假设:当物体以平移速度v移动 时,会改变它们的线度.这种沿运动方向的线度改变是由因 子x√1-(02/02)决定的,其中x为相应的作横向线度改变
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The Potential New Rx “Spin in the Gym” “Prescribed AG Dosage” “AG Sleeper
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Human Visual Orientation in Weightlessness Charles M. Oman Man Vehicle Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139 Abstract: An astronaut's sense of self-orientation is relatively labile, since the gravitational “down” cues provided by gravity are absent and visual cues to orientation are often ambiguous, and familiar objects can be difficult to recognize when viewed from an unfamiliar aspect. This chapter
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orientation of the vehicle is described in engineering t gular and linear position, velocity, acceleration, and often other factors. Engineers are tly confronted with
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“One should beware of mathematicians and all who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and confine man in the bonds of Hell” St Augustine, Bishop of Hippo, circa 400 A.D “To move things is all that Mankind can do…For such the
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Muscles Active while Lengthening Consider the example of ordinary exercise, lets say one of the running events in the Olympics. Muscle functions to stop the motion of the athlete as often as it does to start it. When a load larger than isometric tetanus tension To is applied to a muscle in a tetanic state of activation, the muscle lengthens at a constant
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