2. Brief description of lenticular technology
Though I promised do not go in any complicated details, but there is some basic information about lenticular technology should be mentioned.
As it is we know, humanís eyes see the world in three dimensions, because each eye sees the world under its particular angle of view, in other words sees the image a little bit different, not like another one. This difference is in a certain shift between the objects on a horizontal. And closer objects are shifted more, than the remote ones (picture 2.1).
Hence, it is necessary to give the left image for the left eye, and right for right one in order that the man could sense a three dimensional picture. In other words it is necessary for us to combine and to code the visual information for the both eyes, and then, by using the decoding device to decode this information and to transport the appropriate information to each eye. All the technologies of 3D pictures manufacture are based on this principle.
In our case to decode the information we are going to use a lenticular lens sheet. A lenticular lens sheet itself represents a transparent plastic, which is flat on one side and covered with a number of parallel cylindrical lenses on another side. There is an adhesive layer put on flat part of a lenticular lens sheet, which is closed by a transparent protective film and could be easily removed (picture 2.2).
The paper with printed interlaced image strongly fasteners by an adhesive layer with a lenticular lens sheet, and the cylindrical parallel lenses will decode the interlaced images ready for recognition of a three dimensional picture.
It works in the following way:
Both images are divided to the thin stripes with the width equal to a half of T - distance (picture 2.2). Each lens should be placed above the correlative image stripes from the left and right side images. The left image stripes have to be placed to the right from an optical axis of each lens, and the right ones have to be placed to the left from the optical axis of each lens (picture 2.3).
And now looking at a lenticular 3D picture each eye sees the appropriate image and that creates the three-dimensions illusion.
Of course, it is a pretty much simplified scheme. On practice the best results could be achieved by combining not just two images but from eight to twelve and even more images. It is so because of the use of two images only gives an instant image flipping. And if we use more images they will replace each other smoothly and imperceptibly. Besides, another interesting effect appears and it looks like there is an opportunity to observe an object from the different points of view.
Usually I use the following sequence's actions of lenticular 3D picture manufacturing:
- Parallel multi shooting with the tripod add-on.
- Correction of the snapshotís inclination.
- Alignment of snapshots on a point of reduction.
- Calibration of the printing process, interlacing and printing.
Each action of lenticular 3D pictures manufacturing is very important to make high quality lenticular pictures and described in detail in this book.
3 "Parallel stereo shooting with the tripod add-on",
4 "The frames inclination angle correction",
5 "Snapshots alignment by "zero" point",
6 "Printing process calibration, interlacing and printing",
7 "Example of making 3D lenticular picture using "PhotoProjector" and "ViewsAligner" software"
8 "Laminating (conglutination of printed interlaced picture and lenticular lenses sheet)" and
9 "Making lenticular Flip pictures"
10 "Example of making Flip lenticular picture using "PhotoProjector" software"
you could read just in the full version of this book.
Pay attention to the tool kit and save your money!
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