出国留学网专题频道摄像机栏目，提供与摄像机相关的所有资讯，希望我们所做的能让您感到满意！ 摄像机种类繁多，主要由视频电路和音频电路两大部分组成。其工作的基本原理都是一样的：把光学图象信号转变为电信号，以便于存储或者传输。当拍摄一个物体时，此物体上反射的光被摄像机镜头收集，使其聚焦在摄像器件的受光面（例如摄像管的靶面）上，再通过摄像器件把光转变为电能，即得到了“视频信号”。光电信号很微弱，需通过预放电路进行放大，再经过各种电路进行处理和调整，最后得到的标准信号可以送到录像机等记录媒介上记录下来，或通过传播系统传播或送到监视器上显示出来。
在2014年5月17日的托福阅读考试中有这样一道题：针孔摄像机。针对这道托福考题，出国留学网(www.liuxue86.com)小编来为大家普及一下关于针孔摄像机的背景知识，这样有助于考生在面对这类题目时方便作答。小编在此提醒大家：TPO中，与本文在题材与结构都非常相似的文章是TPO22的The Birth of Photography.这篇文章的第二段第二句提到了camera obscura。
托福阅读真题再现：
版本一：第二篇是讲摄影暗盒技术obscura，一个叫hockney的英国当代画家研究了400个画家来证明中世纪的人用暗盒来辅助画画，以维米尔为例子。讲了他的画如何被认为是使用了该技术，后面提到了一些画家都使用过，还总结了一幅画中使用了该技术的特征，最后说了这个技术并不能抹杀画家本身的实力。
版本二：一开始说了相机成的像是倒置的(标题旁边图 类似小孔成像)。后面通过实验研究发现用镜子可以改变倒置的像。接着说了对艺术家的影响，具体举了一个画家的例子，说他的画可能就是受了相机的影响。但是由于没有对此的记录，作者觉得大概是这个画家不想让大家知道他受了相机的影响。接着又说到了很多画家也可能受到了相机的影响。最后一段说即使相机出现 但是画家还是要有自己在画画上的造诣 并把这些与相机的特点结合起来。
版本三： 有些画家没节操，用小孔成像技术画画还不让别人知道，然后他举了个例子说有个荷兰的画家，叫VIE神马的(达芬奇?)，画画不让人家看也不收徒弟，可能就是因为它利用了这个技术。不过作者后来又说，其实有时候这个技术没啥用，因为最后还得看个人。
词汇：camera obscura n.针孔摄像机
解析：本文围绕针孔摄像机的发明对于油画艺术的主要影响主题为展开论证。文章从三个角度切入，探讨针孔摄像机对于油画艺术的影响，这三个角度恰恰是最后一题文章总结题的三个答案。每个观点独立成段且每段有清晰的主题句的可能性非常大。TPO中，与本文在题材与结构都非常相似的文章是TPO22的The Birth of Photography.这篇文章的第二段第二句提到了camera obscura。
托福阅读相关背景：
Camera obscura
This article is about an optical device. For other uses, see Camera obscura (disambiguation).
A drawing of a camera obscura
Camerae obscurae forDaguerreotype called "Grand Photographe" produced by Charles Chevalier (Musée des Arts et Métiers)
A projection of an image of the New Royal Palace in Prague Castlecreated with a camera obscura
The camera obscura (Latin; camera for...
作文标题： 日记 生活的摄像机
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本作文是关于初中初二1000字的作文，题目为：《日记 生活的摄像机》，欢迎大家踊跃投稿。
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关 键 词： 初中初一 750字
字 数： 750字作文
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作文网(zw.liuxue86.com)提示:我们做的不好的地方还请您多多包涵，请阅读本作文。
本作文是关于初中初一750字的作文，题目为：《我的“摄像机”》，欢迎大家踊跃投稿。
欢迎阅读《作文:我的“摄像机”》，“作文网”每日为您更新更多优秀的“初一作文”，请随时关注！03-09
GRE写作备考过程中，考生需要汇总一定量的GRE写作范文，通过GRE写作范文，考生可以积累高分词汇及句式，并且通过分析范文的文章结构，构架自己的GRE写作模板，在最短的时间内找到自己的主题和论据，完成一篇得分不低的GRE作文。下面，我们就来看一下“GRE写作范文：现代摄像机和印刷术”。
GRE写作题目：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”
摄像机可以通过如此精确而有力的记录手段来再现当代生活，因此它已经代替书面记录成为了一种更重要的记录手段。
GRE写作范文：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”There have been many methods of documenting in the history of human， from carved ancient pottery to sheepskin documents， of which the video camera may be the newest form with certain superiorities and inferiorities to written records. The advantages of video camera certainly make it an important form of documentation， but not to the extent of being more essential than written records due to its disadvantages.
To begin with， video can be interpreted as a series of pictures associated along the time， while written records can be considered as the descriptions of these pictures.Therefore， it is undoubtedly that video contains much more information than that of written records. From a video， we can clearly know what happened with subtle details.Merely with a television set， we can easily watch the happenings at home， such as the O...
04-30
GRE写作备考过程中，考生需要汇总一定量的GRE写作范文，通过GRE写作范文，考生可以积累高分词汇及句式，并且通过分析范文的文章结构，构架自己的GRE写作模板，在最短的时间内找到自己的主题和论据，完成一篇得分不低的GRE作文。下面，我们就来看一下“GRE写作范文：现代摄像机和印刷术”。
GRE写作题目：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”
摄像机可以通过如此精确而有力的记录手段来再现当代生活，因此它已经代替书面记录成为了一种更重要的记录手段。
GRE写作范文：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”There have been many methods of documenting in the history of human， from carved ancient pottery to sheepskin documents， of which the video camera may be the newest form with certain superiorities and inferiorities to written records. The advantages of video camera certainly make it an important form of documentation， but not to the extent of being more essential than written records due to its disadvantages.
To begin with， video can be interpreted as a series of pictures associated along the time， while written records can be considered as the descriptions of these pictures.Therefore， it is undoubtedly that video contains much more information than that of written records. From a video， we can clearly know what happened with subtle details.Merely with a television set， we can easily watch the happenings at home， such as the Olympic Gam...
04-22
光明网科技讯 麻省理工学院媒体实验室的研究人员开发出了一个新的激光驱动的摄像机，它可以看到拐角后面的物体。
相机取得拐角后物体成象使用了两种技术的结合：飞秒激光(femtosecond laser)和计算机算法程序重组图像。飞秒激光是激光以每千万亿分之一秒 (onequadrillionth of a second) 的频率发射光脉冲激光；计算机算法程序重组图像，是用一套计算方法把像机里的感光数据与其相应的时间座标还原为图像。该技术的操作显示在 《自然》杂志网站上的动画视频中（nature.com, 2010年3月20日）。
实际上其成像是一个相对简单的过程。激光/相机组对着隐藏物体背后的墙壁，发射激光，激光脉冲撞击在墙上，向各个方向散射光子。一些光子直接反弹回相机，而另一些光子则撞到隐藏物体后又反弹到别的墙壁，经过多次反弹，最终再反弹回相机。通过精密摄像头，加上高速感光探测器，光子被接收。
麻省理工学院的相机在记录光子时，同时记录下光子飞行时间。所有从照射墙上直接反弹的光子都被过滤掉后， 多次反弹的光子就可重建墙后另一边隐藏物的三维图象。目前相机所取得的图像是不完美的，有点模糊和变色，但是仍然能提供相对可清楚辩认的三维图像。 麻省理工学院认为，它可以迅速提高指日可待的场景图像的分辨率，该技术在军事，消防，非直视条件下导航系统，及其它领域都有广泛应用前景。
这项研究领军者，麻省理工学院媒体实验室副教授，拉梅什西拉斯卡尔(RameshRaskar)说 “四年前，当我谈到室内应用飞秒激光器，超快光学时，他们说，这是个完全荒谬的设想。”
新相机的演示结果论文发表在《自然》杂志通讯上。
...
03-15
GRE写作备考过程中，考生需要汇总一定量的GRE写作范文，通过GRE写作范文，考生可以积累高分词汇及句式，并且通过分析范文的文章结构，构架自己的GRE写作模板，在最短的时间内找到自己的主题和论据，完成一篇得分不低的GRE作文。下面，我们就来看一下“GRE写作范文：现代摄像机和印刷术”。
GRE写作题目：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”
摄像机可以通过如此精确而有力的记录手段来再现当代生活，因此它已经代替书面记录成为了一种更重要的记录手段。
GRE写作范文：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”There have been many methods of documenting in the history of human， from carved ancient pottery to sheepskin documents， of which the video camera may be the newest form with certain superiorities and inferiorities to written records. The advantages of video camera certainly make it an important form of documentation， but not to the extent of being more essential than written records due to its disadvantages.
To begin with， video can be interpreted as a series of pictures associated along the time， while written records can be considered as the descriptions of these pictures.Therefore， it is undoubtedly that video contains much more information than that of written records. From a video， we can clearly know what happened with subtle details.Merely with a television set， we can easily watch the happenings at home， such as the Olympic Games， comfort...
GRE考试形式：中国大陆地区、香港、澳门、韩国目前执行分开考试的形式。由机考（分析性写作）和笔试（语文、数学）组成。
题目：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”
摄像机可以通过如此精确而有力的记录手段来再现当代生活，因此它已经代替书面记录成为了一种更重要的记录手段。
正文：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”There have been many methods of documenting in the history of human， from carved ancient pottery to sheepskin documents， of which the video camera may be the newest form with certain superiorities and inferiorities to written records. The advantages of video camera certainly make it an important form of documentation， but not to the extent of being more essential than written records due to its disadvantages.
To begin with， video can be interpreted as a series of pictures associated along the time， while written records can be considered as the descriptions of these pictures.Therefore， it is undoubtedly that video contains much more information than that of written records. From a video， we can clearly know what happened with subtle details.Merely with a television set， we can easily watch the happenings at home， such as the Olympic Games， comfortably sitting on the sofa， needless to be present on the spot.
And more excitedly， certain close-...
12-09
题目：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”
摄像机可以通过如此精确而有力的记录手段来再现当代生活，因此它已经代替书面记录成为了一种更重要的记录手段。
正文：
“The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records.”There have been many methods of documenting in the history of human， from carved ancient pottery to sheepskin documents， of which the video camera may be the newest form with certain superiorities and inferiorities to written records. The advantages of video camera certainly make it an important form of documentation， but not to the extent of being more essential than written records due to its disadvantages.
To begin with， video can be interpreted as a series of pictures associated along the time， while written records can be considered as the descriptions of these pictures.Therefore， it is undoubtedly that video contains much more information than that of written records. From a video， we can clearly know what happened with subtle details.Merely with a television set， we can easily watch the happenings at home， such as the Olympic Games， comfortably sitting on the sofa， needless to be present on the spot.
And more excitedly， certain close-up enables us to scrutinize our favorable athletes. If there isn‘t video camera， we may...
06-11
2011年06月11日 11时32分，《考试资源网:手机相机摄像机 “后高考经济”令商家狂喜》由出国留学网liuxue86.com编辑整理.
本报讯 （记者 符樱） 高考(微博)刚结束，武汉商家就开始掘金“后高考经济”，有商家坦言，如今不少家长奖励考生舍得花钱，“后高考消费”逐年升级。
昨日，记者走访了解到，多家商场本周末促销大打考生牌。武广引爆“高考放榜玩酷数码”活动，将运动休闲产品、高新数码产品作为促销主力；世贸广场称，高考学生凭准考证购物满额，可获赠 “悠游咸宁”套票，到太乙温泉水上乐园和太乙洞游玩。
工贸、苏宁、国美等家电商家，将新款手机、数码相机、单反相机、摄像机、笔记本电脑等3C产品，作为“后高考”促销战中的“王牌军”，有的直降三五百元。
“高考结束后，很多家长都会给子女送礼物作为奖赏。”有本地商家举例说，高考结束后的一段时间，数码产品的销售量会比平常增长50%以上，学生和家长是采购主力军。
据商家介绍，如今一些家长奖励孩子出手很大方，有的甚至在端午期间就已提前买好了奖品，八九千元的苹果笔记本、上万元的单反相机等，都有家长采购。
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