STEREOSCOPIC IMAGES FOR VISUALIZATION OF CULTURAL HERITAGE

[ Stereoscopic Vision | Image Separation | Photos & Computing | File Formats | References ]

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3 Stereoscopic File Formats

Side by side is the basic arrangement of a stereo pair according to the position of the human eyes. From the two free viewing modes parallel and cross-eyed, parallel is limited to very small images. Therefore cross-eyed is the default mode of a JPS stereo pair. JPS is in fact a JPEG format which allows specific stereo software to handle those images. For example a Web browser plug-in from Vrex Corp. interprets that format and converts it to the viewing mode available.

According to BMP or PNG (portable network graphics) the stereo formats BMS and PNS are existing. While BMS has no direct form of compression, PNS is a no-loss form of compression. Using the JPS format, a moderate amount of compression is recommended, since a major loss of stereo quality will occur while reducing image information.
Click into the image to view more stereoscopic file formats. Click into the image to view more stereoscopic file formats. <! Here you can apply the different parameters: > <! Here starts the code for those who have no JAVA browser!>

If you had a JAVA 1.1 enabled browser, you would see a stereoscopic image here!
So you get a preview version only:

skulptur

<! Here ends the code for those who have no JAVA browser!>

 

5 Publishing Stereo Pairs via Internet

Like mentioned in chapter 3 about the stereoscopic file formats, Web browser plug-ins are available which can convert the stereo image formats JPS, BMS or PNS to the viewing mode available.

The same result is provided by using a Java applet. The one documented here is named Stereoscope and written by Andreas Petersik. Use of this applet on Web-pages is free. Add the applet-tag to your HTML code and define the requested values.

The parameters for leftImage and rightImage define the URLs of the stereo images. By clicking in the image a dialog window for overwriting the default parameters opens, after setting the viewing method, the image pair will be calculated as selected The advantage of using this applet is the distribution of the original images instead of all the formats for various viewing methods. An example of using stereoscope is given in chapter 3, for further information refer to www.stereofoto.de. Without using a plug-in or a Java applet, the Web-page should contain thumbnails and icons to click for a requested viewing mode and several stereo models.

  
 

Summary

Techniques for displaying stereo images and stereo file formats are briefly described. Some aspects of taking stereo photos and calculating stereo pairs in a virtual environment are listed. Samples are given as anaglyphs. The use of a Java applet for publishing stereo images via the Internet is shown.

 
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