Image brightness

An example of the application of J2-weighted imaging is afforded by the imaging of the dynamics of chemical waves in the Belousov-Zhabotinsky reaction shown in figure B 1.14.5 [16]. In these images, bright... 

Protocols of use First register the image brightness of paper matrixes in plates (plate 1) then again register the second image of the plate with biotests (plate 2) (see suppl. 3). The value of D was calculated by the standard formula ... 

Fig. 3.8 (b) Computer simulation image of same Ir surface. In this simple simulated image, no image brightness variation is considered. Thus the boundary is less clearly seen. Brightness variations can be incorporated into the simulation. For alloys, different colors can be used for different chemical species. 

Fig. 9 STM images of C50 on a Si(lll)—V3 V 3—Ag surface at 60K and sample bias —2 V. (a) Shows the undoped monolayer which consists of molecules presenting two different kinds of striped image, labelled A and B. In (b), a K-doped monolayer is imaged, which results in a completely different set of images bright U and dim X shaped molecules now dominate. Reprinted figure with permission K Tsuchie, T Nago and S Hasegawa, Phys. Rev. B 60, 11131 (1999) [35]. Copyright (1999) by the American Physical Society...

Resolution and image brightness are maximized if a cone of illuminating rays is incident on the specimen. The contrast of fine detail can be enhanced by artificially and selectively operating on the characterizable properties of the oblique illumination, relative to the normally incident component. 

Visibility requires that the contrast of an object exceeds a critical value called the contrast threshold. The contrast threshold of an object is not constant for all images but varies with image brightness. In bright light, the threshold can be as low as about 3% while in dim light the threshold is greater than 200%. 

Ultamicroscopic image Bright particles in motion Diffuse light cone... 

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