Stereo pair images

Fig. 14. Stereo pairs of the transverse structure (A) and the axial structure (B) of a 3D model relating successive half sarcomeres in vertebrate-striated muscles. In both images, the wide blue and brown cylinders represent actin filaments, the gray cross-links...

Surface topography can also be studied using 3-D imaging. Two sueeessive photographs of the same field are made with the specimen tilted by 11° to 14° between photographs. This stereo-pair can then be viewed with stereo viewing lenses for a remarkable sense of the third dimension. 

Generally, images in the TEM are two-dimensional, because the depth-of-focus of the imaging lenses is greater than the thickness of most biological specimens. Tilting the specimen and viewing stereo pairs, especially of specimens prepared as replicas or that are shadowed, can provide three-dimen-... 

Some good pictures can be obtained using intermediate thickness optical sections, at horizontal levels between the slide and the coverslip. The quality of the images facilitates the preparation of stereo-pairs, in order to observe textures in three dimensions. The two examples shown in Fig. 7 were obtained simply by tilting the preparation slightly differently. The stereoviews of Fig. 7 a and b show hyperbolae branches... 

Most organic molecules are three-dimensional structures, best viewed and represented in solid molecular models. The necessity of using paper requires pictures that show depth, as perspective does in artwork and photography. The mere projection onto the plane of the paper, as in the shadow of a molecular model, loses the real difference between left- and right-handed structures. The best alternative on paper is a stereo pair of pictures as exemplified in Figure 3.1. The image on the left is for your left eye and... 

Figure 6 Stereo pairs of maximum intensity projection bright blood MR angiograms acquired from rat brain (A) and abdomen (B). Contrast between flowing and static fluid was enhanced in (B) by administration of a colloidal magnetite contrast reagent which shortens T2 and T2 of blood relative to static tissue. The 3D effect can be best appreciated by viewing the images through stereo viewing...

Figure 21.7. Standard SEM image (left) and corresponding SEM stereo image (right) of a carbon aerogel the picture consists of two separately taken pictures, colored in red and cyan, respectively, of the same spot of the sample, however, with the sample tilted by 9° between the two pictures. Using a pair of red-cyan glasses the depth of the pores and the openness of the aerogel backbone becomes evident.

The ability to see molecular models or other three-dimensional data on a computer screen was a novelty that further widened interest in computer graphics. Most users required special stereo glasses to see the images in stereo, but some chemists delighted themselves by mastering the relaxed-eye or crossed-eye of looking at the pairs of images. 

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