Alien Registration- Randall, John W. (Perry, Washington County)

https://digitalmaine.com/alien_docs/1548/thumbnail.jp

Predictive vector quantization of images using a constrained two-dimensional autoregressive predictor

Journal ArticleA novel approach to image compression using vector quantization of linear (one-step) prediction errors is presented in this paper. In order to minimize the image reconstruction error, we choose the optimum predictor coefficients (in a least-squares sense) that satisfy the additional constraint that the energy of the impulse response function of the inverse reconstruction filter is bounded by a small constant C. Further, the code vectors are selected such that the reconstruction error is minimized, rather than the quantization noise for the prediction error sequences. Examples demonstrating the excellent quality of the reconstructed images using our approach at bit rates below 0.65 bit/pixel are presented

Synthesis and Use of Diagnostic Radio-Pharmaceuticals Comprising Radioactive Isotopes of Bromine with Dyes

A process for preparing bromine-containing dyes labelled with gamma-emitting isotopes of bromine, and the product thereof which is useful as an imaging agent for the hepato-biliary system, particularly in dynamic imaging methods. The dyes prepared are from the class of triarylmethane dyes, and also from the phthalein subclass of the class of xanthene dyes, and the labelling thereof is effected with 76Br, 77 Br or 82 Br. The process for preparing these dyes involves reacting the non-brominated dye precursor with either 76 Br2, 77 Br2 or 82 Br2. This is a substitution type of reaction in which a ring hydrogen is substituted by either 76 Br, 77 Br or 82 Br

Image compression using vector quantization of linear (One-Step) prediction errors

Journal ArticleABSTRACT A novel approach to image compression using vector quantization of linear (one-step) prediction errors is presented in this paper. In order to minimize the image reconstruction error, we choose the optimum predictor coefficients (in a least-squares sense) that satisfy the additional constraint that the energy of the impulse response function of the inverse reconstruction filter is bounded by a small constant c. Further, the code vectors are selected such that the reconstruction error is minimized, rather than the quantization noise for the prediction error sequences. Examples demonstrating the excellent quality of the reconstructed images using our approach bit rates below 0.65 bit/pixel are presented

Motion picture analysis of hard contact lens fitting

Various hard contact lens fitting techniques were filmed in color and analyzed. The topics studied were the following: l. changes in Base Curve (BC) with all other parameters held constant, 2. changes in Overall Diameter (OAD) with all other parameters held constant, 3. changes in Optic Zone Diameter (OZD) with all other parameters held constant, 4. effect on tear fluid exchange when the Peripheral Curve Radius (PCR) is widened, 5. the observation of the fluorescein pattern on a highly toric cornea. This film is to be used as an instructional aid for second ·\u27 year contact lens students at Pacific University College of Optometry