Browse Prior Art Database

Rectangular Internally Mosaicked Coded Apertures

IP.com Disclosure Number: IPCOM000041877D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gourlay, AR: AUTHOR

Abstract

In a sequence of recent articles [1,2] we have shown how coded aperture masks with a simple structure can be designed so that they have the desirable decoding properties of uniformly redundant arrays. In this article a further generalization of these concepts is given to provide an even more flexible design mechanism for such masks. We consider an (n, m, s, t) mask, as shown in Fig. 1, where the unit entries indicate an open (transparent) area, and the zero entries correspond to closed (opaque) regions. A mask can thus be regarded as a binary array. Notice that this structure exists for s, a factor of n, and t, a factor of m. For such a mask A the required decoding array structure G can be shown to have the form of that in Fig. 2. This array has the property that A*G = WG.

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Rectangular Internally Mosaicked Coded Apertures

In a sequence of recent articles [1,2] we have shown how coded aperture masks with a simple structure can be designed so that they have the desirable decoding properties of uniformly redundant arrays. In this article a further generalization of these concepts is given to provide an even more flexible design mechanism for such masks. We consider an (n, m, s, t) mask, as shown in Fig. 1, where the unit entries indicate an open (transparent) area, and the zero entries correspond to closed (opaque) regions. A mask can thus be regarded as a binary array. Notice that this structure exists for s, a factor of n, and t, a factor of m. For such a mask A the required decoding array structure G can be shown to have the form of that in Fig. 2. This array has the property that A*G = WG. where * is the correlation operator, and wG is an array containing only one nonzero element. For a general (n, m, s, t) array the parameters can be defined by the relationships. This mask has an openness ratio of (sm+tn-st-1)/mn. For masks with an openness ratio of greater than 0.5 the corresponding complementary mask would be used. This would be defined by B=U-A, where U is the array of unit entries. A corresponding decoding array can be defined for this mask B. References. 1.ÙA. R. Gourlay, "Coded Aperture," IBM Technical Disclosure Bulletin 26, 3A, 908-909 (August 1983). 2. A. R. Gourlay, "Rectangular Coded Aperture,"IBM Technical Disclosure B...