Don't be fooled: this is a real holographic Imaging-holograms, Hololens,Magic Leap-IT information

To identify seen images are not holographic, first what is the definition of clear hologram. As defined by the dictionary and Wikipedia, the holographic (holography) is a technical term, by means of coherent light (laser is one of) interference record and view images, when properly when it is present, it can accurately reproduce the dimensional appearance of the object to be recorded.

But in a foreign language is often see the word "hologram", when it refers to holographic recording in the recording media (such as film) formed on the mark, and we do not see images. Media, PR and mass will often "hologram" and another word "holographic image" mix, which is by exposure to light (light) to the reproduction of three dimensional image on the hologram, is can we see floating picture.

Video screenshot, for more information please click the link below

Real hologram is like, you can watch a video of the 1972:Introduction to Holography. Video film records the object's three dimensional image information as a whole, and by laser reappear.

Above is the hologram in the strict sense, we then defined to talk about reality.

HoloLens allows users to see images of floating in the air, although the actual field of view without publicity so much

The reality is that when the crowd when it comes to holographic, they think of and is not Laser Interferometer, but in the eyes of three-dimensional images of floating in the air. It is for this reason led to the "holographic" misuse of the word, as long as the vision of virtual images are likely to be called a hologram. Want to climb "black science" PR, trying to attract the eye of the media and uninformed but we believe what they see in public, contribute to this phenomenon.

To let you see floating in the eyes of the three dimensional images, actually means very much, and usually with a powerful laser, interference did not make much difference, but in the way our visual system to see the outside world. When we look at close objects, and has 6 major depth cues to help us form a three dimensional vision.

1, perspective: distant objects appear smaller;

2, block: close objects will block object;

3, eyes (stereo) parallax: left and right to see different views of the same object;

4, SLR (sports) parallax: when the head moves, distant and near objects to a different range of movement;

5, aggregation: sight when the eyes focus on close objects, the two eyes converge;

6, regulation: according to distance, eyes adjust the focus accordingly.

Hologram is going to reproduce all these 6 depth cues, trick the brain completely, let it think "see ghosts". If that's the case, those not based on lasers and interference, but do display technology can achieve the same effect can also be called a hologram?

So, if we are to be realistic, if judged from the point of view of the user's Visual holographic, ignoring the 6th (because if it included most of the equipment will be excluded), then we can give the following standards:

A holographic display device should be at least one user to create virtual images, and to satisfy the di1-5tiao depth cue.

Such definitions is a good way to judge claims to be holographic display device classification, while in the public understanding of the hologram. To answer some readers ' questions below:

1, the need is not holographic media?

Media said the issue should be referring to in the previous article used illusion Pepper's glass or holographic film, if in accordance with this standard, whether there is does not affect whether the media is holographic. Real hologram is sure to media, see earlier in this video.

2, hatsune is holographic and about 8 minutes?

This question should be the concert of hatsune is a holographic, this can be said to be ' no ', because it is a flat projection mechanism, 3rd, 4 and 5 is missing the depth cues, seen from the side is flat; the technology currently used in about 8 minutes cannot be determined, but speculation should also be a similar mechanism of projection.

3, Magic HoloLens and Leap is a holographic device?

If Magic Leap and as shown in the demo, then they are, they can meet the di1-5tiao depth cues, or even article 6th.

4, triangle (square) showcase is a holographic glass?

No, the principle is Pepper's illusion, you can see images of three or four, not 360 degrees.

5, VR helmet is a holographic device?

Holographic helmet display with location tracking devices, such as HTC Vive and Oculus CV1, since its 1-5 depth cue, and Gear VR and Cardboard are not.

6, 3D TV holography device?

No, because there is no article 4th depth cues.

Through these questions, we probably know what holographic visual effect you want. In fact, the standard of this article is already a compromise, many people think HoloLens should not be called a holographic display device, but pseudo holographic because you need to wear a heavy helmet to see those images. Nothing wrong with these people, but called holographic HoloLens is not wrong, it can achieve the same effect, after all, many people see the real-world need glasses (myopia), see how holographic multiple glasses.

Robot cast in the movie star wars hologram

Small, for public, not like a flashlight out of a science fiction movie that hologram holographic technology as real, not Pepper's illusion that 2D lighting skills as holography, is enough.

别被忽悠：这才是真正的全息影像 - 全息影像,Hololens,Magic Leap - IT资讯

要对辨别看到的影像是不是全息，首先要明确全息的定义是什么。根据字典和维基百科上的定义，全息（holography）是一个技术名词，指通过相干光（激光就是其中一种）干涉原理记录和查看图像，当合适地将其呈现时，便可以精确地再现被记录物体的三维外观。

但是外文时常看到的一个词是“hologram”，它指的是进行全息记录时在记录媒介（比如胶片）上形成的印记，并不是我们看到的影像。而媒体、PR和大众时常将“hologram”与另一词“holographic image”混用，后者指的是通过照射光线（相干光）到hologram上再现的三维影像，就是漂浮着能被我们看到的画面。

视频截图，详细信息还请点击下面的链接

真正的全息影像是什么样，各位可以看一段1972年的视频：Introduction to Holography。视频里用胶卷记录了物体的整个三维图像信息，并通过激光重现出来。

以上就是严格意义上的全息，那么定义完了我们来谈一谈现实。

HoloLens可以让用户看到漂浮在空中的三维影像，虽然实际视场角没有宣传图这么大

现实是，当大众提到全息时，他们想到的不是激光和干涉原理，而是眼中看到的漂浮在空中的三维影像。正是这个原因导致“全息”这个词被滥用，只要是震撼视觉的虚拟影像都有可能被叫做全息。希望攀上“黑科技”的PR，想要吸引眼球的媒体和不明就里但相信自己亲眼所见的大众，共同促成了这一现象。

要让你眼中看到漂浮的三维影像，其实办法非常多，而且通常和激光、干涉没多大关系，而是在利用我们的视觉系统看外部世界的方式。当我们看近处的物体时，有6个主要的深度线索帮助我们形成三维视觉。

1、透视：远处的物体看起来更小；

2、遮挡：近处的物体会挡住处的物体；

3、双眼（立体）视差：左右眼看到同一物体的不同视图；

4、单眼（运动）视差：当头部运动时，远处和近处的物体会以不同幅度运动；

5、聚合：当眼睛聚焦在近处物体时两眼视线汇合；

6、调节：根据物体的距离，眼球相应地调整焦点。

全息影像就是要把这6个深度线索全部重现，完全骗过大脑，让它以为“见到鬼”了。如果是这样的话，那些不是基于激光和干涉，但能达到同样效果的显示技术是不是也可以称为全息呢？

所以，如果我们现实一点，从用户视觉的角度来判断是否全息，再把第6个点忽略（因为如果包括进来绝大部分设备都会被排除），那么我们可以给出下面这个标准：

一款全息显示设备至少应该为一位用户创造虚拟三维物体影像，且要满足第1-5条深度线索。

这么定义可以很好地对各种自称全息显示的设备进行评判分类，同时又符合公众对全息的理解。下面就来回答一些读者的疑问：

1、需要介质的都不算全息？

这个问题所说的介质应该是指上一篇文章中佩珀尔幻象所用的玻璃或全息膜，如果按照本文的标准，是否有介质并不影响是否是全息。而真正的全息是肯定要介质的，见上文中的视频。

2、初音未来和里约8分钟是不是全息？

这个问题问的应该是初音未来的演唱会是不是全息，这个基本可以说是否定的，因为它用的就是一个平面投影机制，缺少第3、4和5个深度线索，从侧面看就是平的；里约8分钟所用的技术目前不能确定，但猜测也应该是某种类似的投影机制。

3、Magic Leap和HoloLens是不是全息设备？

如果Magic Leap和demo中演示的一样，那么他们都是，它们可以满足第1-5条深度线索，甚至是第6条。

4、三角（四角）玻璃展示台是不是全息？

不是，其原理也是佩珀尔幻象，你可以看到影像的三个或四个面，并不是360度。

5、VR头盔是不是全息设备？

带空间位置追踪的头盔是全息显示设备，比如HTC Vive和Oculus CV1，因为其支持1-5条深度线索，而Gear VR和Cardboard不是。

6、3D电视是不是全息设备？

不是，因为没有第4条深度线索。

通过以上这些问题，我们大概可以了解全息想要的视觉效果是什么。实际上，本文的这一标准已经是经过妥协的，许多人认为HoloLens不应该被称为全息显示设备，而是伪全息，因为你需要戴个笨重的头盔来看到那些影像。这些人并没有错，但把HoloLens称为全息也不是不对，它确实可以实现同样的效果，毕竟许多人看清真实世界还需要眼镜呢（近视），看全息多个眼镜能怎样。

电影《星球大战》里的机器人投出全息影像

小编觉得，对于大众来说，只要不把科幻电影里那种像手电筒一样打出一个全息影像当成真实的全息技术，不把佩珀尔幻象这种2D光影技巧当成全息，就够了。