In this blog,we will see how amazingly we can use the computer hologram images for three dimensional projection.As we have seen in earlier post that the 3D hologram can be seen without using 3D glasses.So,How do they do it? The concept is actually based on an illusionary technique called Peppers Ghost .John Henry Pepper was the one who attempted to popularize this effect.It was first used in Victorian Theaters across London in the 1860s. In pepper's ghost there are two rooms, one room is visible to the audience which is the "main room and the other one is hidden called as "blue room". A plate of glass is placed somewhere in the main room at an angle that reflects the view of the blue room towards the audience. Generally this is arranged with the blue room to one side of the stage, and the plate on the stage rotated around its vertical axis at 45 degrees. This can be used to make objects appear to float in space. Isn't it interesting? ...
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Applications of Computational Holographic Imaging W hile going through some quotes on the internet , I came across one quote which I would like to share with you all ... “ Life is a hologram. Even the smallest moment contains eternity within it. ” -Banani Ray This relates the concept of hologram to our life in very philosophical way...like this there are many applications of holograms in industrial sector and our life As we know that the holography uses the concept of interference, we can have many applic...
Raster graphic models are the most common and better suits to an object data provided by physical extra sensors, such as image and 3D scanner. In computer graphics , a raster matrix is a dot matrix which is a data structure that represents a rectangular grid of pixels , viewable on a monitor , paper , or other displays. These rater graphics are digital images created as a set of samples of a given space .It has a raster grid of x,y and z coordinates for 3D images.The image file decides which of these coordinates to illuminate in monochrome or color values.It is also referred to as bitmap because it contains information that is directly mapped to the display grid. Raster graphics model in 3D is composed of tiny squares that work together to create a recognizable object hologram:- The image below shows greyscale raster graphic model implemented by hologram display:- Images source:- https://images.wisegeek.co...
The first holograms were invented by A. Lohmann . It made use of computer line printers and prodcued using coherent LASER illumination .Th following figure shows one of the first computer-generated hologram and its reconstruction. As one can observe easily, it is very hard to comprehend the actual image from the holograms. As the developments progressed , more and more sophisticated recording devices were used to create gray scale holograms. The figure represents an example of grey-scale computer-generated hologram and an image reconstructed from a grey scale hologram. Implementation approach by the inventors : The grey scale holograms were recorded using electro-mechanical recording device (a modified faximile machine) with resolution 200 μm and then optically reduced with reduction factor 20 to final resolution 10 μm for optical reconstruction with a laser beam. Now we'll discuss about the mathematical aspects .Mathematical model of the object is usedto ...