# 电子工程代写|虚拟现实代写Virtual Reality代考|ACM419

## 电子工程代写|虚拟现实代写Virtual Reality代考|Wonder Wheel and High-Speed Viewer

The reproduction of an image turns the camera obscura into a magic lantern. Through a superimposition of individual images, the perspectives merge into an impression of movement. But it is only through the permanent recording of the latent image that the pure viewing device of the camera obscura becomes a photographic camera. By reproducing the recorded images in a sequence, the magic lantern finally becomes a film projector.

A limited form of projection of movement as a sequence of images or by means of image rotation had already been described by Kircher, Zahn or Ehrenberger. However, a realistic impression is created when the images are cross-faded. The term “dissolving views”describes not only the cross-fading of two subsequently played individual images, but also the sometimes desired blurring of the image projection during the image change (by adjusting the projection lens into the blurred area).

The effect goes back to the end of the eighteenth century and the illusionist Phylidor. ${ }^{39}$ Little is known about Phylidor’s origins, but numerous of his performances, especially in necromancy and black magic, have been handed down by contemporary witnesses. ${ }^{40}$ In London, he-now under the name Philipsthal-extended his performances in London by the phantasmagoria. In an explanation of his magic tricks from 1825 [105], his magic lantern is also shown (Fig. 3.36).

Philipsthal cross-faded two different images to achieve amazing effects. A well-known demonstration was the cross-fading of the Witch of Endor ${ }^{41}$ with the ghost of Samuel (by means of two “Laterna magica”). However, Philipsthal later added the cross-fading of landscapes to these presentations [106]. In England, these dissolves were commonly referred to as dissolving views [107].

## 电子工程代写|虚拟现实代写Virtual Reality代考|Projection Magic

In the middle of the nineteenth century, the successful Viennese magician Ludwig Döbler thrilled the public not only with his magic tricks, but especially with his fog pictures [118].

Döbler demonstrated his fog picture apparatus in January 1847 at the Theater in der Josephstadt (Vienna). The editor of the Österreichisches Morgenblatt describes his impression:
The present performance is certainly a new, honourable progress of his striving in the field of optics… In the second section we see nebular images with moving figures. The solution of this optical task, which, as far as we know, belongs to Döbler’s inventive talent alone, was at any rate satisfactory,… What pleased us most was the deceptive mobility of the ‘Turkish juggler’, the ‘hoop-jumper’ and the ‘rope-dancer’… [119].
In the years following the first performance, one also finds the designation “Döbler’s Nebelbilder”. 46

Döbler’s fame went well beyond Vienna. He also appeared before the Russian Tsar Nicholas [118] or the King of Prussia, ${ }^{47}$ and finally even met Goethe in Weimar. At Döbler’s rcqucst, Gocthe dedicated a linc to him, “Not nccessary to scal a diploma, you have shown us the impossible.” (“Bedarfs noch ein Diplom besiegelt, unmögliches hast du uns vorgespiegelt.”) [121]

At least as famous as Döbler’s fog pictures was “Pepper’s ghost” a few years later. The magic trick has nothing to do with pepper spirit, but is named after its inventor, ${ }^{48}$ the London teacher Pepper. The idea behind it is simple, it is a simple mirror trick. Behind a pane, which is tilted by 45 degrees, is the stage. On this brightly lit stage the performance takes place. In another part of the stage, which cannot be seen by the spectator, the “ghost” or some person who appears unexpectedly is waiting to perform. When the ghost is illuminated, it is reflected in the tilted mirror. If the mirror is tilted appropriately, the ghost now appears to the spectator on stage as well. This effect is nowadays sometimes mistakenly called a hologram. ${ }^{49}$

## 电子工程代写|虚拟现实代写Virtual Reality代考|Wonder Wheel and High-Speed Viewer

Kircher、Zahn 或 Ehrenberger 已经描述了将运动投影为一系列图像或通过图像旋转的有限形式。然而，当图像交叉淡化时，会产生逼真的印象。术语“溶解视图”不仅描述了两个随后播放的单独图像的交叉淡入淡出，而且还描​​述了在图像变化期间有时期望的图像投影模糊（通过将投影镜头调整到模糊区域）。

Philipsthal 交叉淡化两个不同的图像以达到惊人的效果。一个著名的演示是恩多女巫的淡入淡出41与塞缪尔的鬼魂（通过两个“Laterna magica”）。然而，菲利普斯塔尔后来在这些演示文稿中添加了风景的交叉淡入淡出[106]。在英国，这些溶解通常被称为溶解视图[107]。

## 电子工程代写|虚拟现实代写Virtual Reality代考|Projection Magic

1847 年 1 月，多布勒在 der Josephstadt（维也纳）的剧院展示了他的雾像仪。Österreichisches Morgenblatt 的编辑描述了他的印象：

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