Showing papers in "Computer Graphics and Image Processing in 1977"

TL;DR: In this article, a number of simple and inexpensive enhancement techniques are suggested to make use of easily computed local context, features to aid in the reassignment of each point's gray level during histogram transfomation.

TL;DR: The concepts of art “edge activity index” and a “locally adaptive threshold” are introduced and shown to improve the performance of this method as well as other edge operators such as Kitsch and Sobel.

TL;DR: A memoryless nonlinear, space-invariant transformation of the pixel brightness values is proposed in this paper, which is based upon the histogram of the picture to be processed and the nature of human brightness perception.

TL;DR: A goal-directed method of detecting boundaries in two-dimensional and three-dimensional space is presented as well as the motivation of the research.

TL;DR: The complexities encountered in applying segmentation techniques to color images of natural scenes involving complex textured objects are analyzed and new ways of using the techniques to overcome some of the problems are explored.

TL;DR: In this article, the problem of estimating the area and perimeter of blobs given as digital binary pictures has been studied, and the analysis of some properties of digital pictures leads to two such methods, one using only local, position-invariant parallel picture processing operations and the other one using explicit polygonal approximations of the picture contour.

TL;DR: A stochastic model of edge structure is proposed and the edge detection problem formulated as one of least mean-square spatial filtering, which indicates substantial advantages over conventional edge detectors in the presence of noise.

TL;DR: The aim of this preliminary profile-recognition study was to develop algorithms for defining unique individual description vectors from manually entered profile traces, which showed that unique individual differentation was clearly obtaincd for each member of the population.

TL;DR: An easy to use method for determining the number of vectors needed in the approximation of closed contours in two dimensions by harmonioally related rotating vectors with elliptical loci is given.

TL;DR: Using SIRT, direct 3-D reconstruction is shown to be superior to serial 2- D reconstruction from coaxial projections when the range of viewing angles is limited and the concept of tomographlc projections is introduced and shown to greatly simplify the calculations.

TL;DR: In this article, a scene with moving components can be segmented into its basic objects by estimating the motion content from a series of static pictures, and points with the same velocity measurements are grouped together.

TL;DR: This paper presents a framework for the sequential processing of aa image which can be used for extracting a variety of shape features, making only one pass over the image.

TL;DR: A two-stage recognition system for the recognition of the Telugu alphabet (with more than 2000 different characters) is presented, based on the observation that theTelugu characters are composed of certain primitive shapes and basic letters.

TL;DR: In this paper, the effects of reducing the terms used for expansion of the Hueckel edge detector were examined and it was shown that a significant loss in performance by such simplifications is observed.

TL;DR: An interactive digital computer system that uses a three-color film digitizer to measure the color of individual trees to detect the presence of insect infestation and shows the degree of infestation present.

TL;DR: A simple modification of Horn's circle drawing procedure yields a disk generator for a class of graphic devices capable of drawing rectangular areas.

TL;DR: The distinguishing feature of the LDE from the multitude of interactive graphics programs that accomplish the same function is the use of a computer controlled TV camera for input and program control rather than conventional interactive input devices such as light pens or data tablets.

TL;DR: The Huffman-Clowes coding scheme for trihedral solids is extended to the hidden vertex configurations also and a generative rule which removes hidden lines as and when the solid is generated, is described.

TL;DR: In this article, a template-matching process is used to determine the "lineness" value of the image at each point, in a set of orientations, and the output of the detection process is the strongest of these values at each points and the orientation that gave rise to this value.

TL;DR: In this paper, a general sequential algorithm capable of determining any concavity in a digitized picture is presented, which can discover localized as well as smooth (gentle) concavities within the extreme limits of sampling.

TL;DR: A bibliography of over 450 References related to the computer processing of pictorial information, arranged by subject matter is presented, including digitization rind compression; transforms and filtering; enhancement, restoration, and reconstruction.

TL;DR: This paper describes PROPAR, a system that allows a convenient and uniform mechanism for recognizing one-dimensional intensity profiles and is a modified Augmented Transition Networks parser.

TL;DR: It is shown that, although a great deal of arithmetic computation is involved, the greater the number of image elements, the faster the parallel machine becomes in comparison with the sequential machines.

TL;DR: In this article, a probabilistic object model for the performance analysis of various algorithms of computerized transverse axial tomography (CTAT) is proposed, which allows an analysis of the expected mean square reconstruction error as a function of system parameters and object properties, namely, correlation.

TL;DR: Criteria for comparing circle generation algorithms are presented, and an algorithm optimal with regard to these criteria is described.

TL;DR: An experimental paradigm for knowledge acquisition is presented, an analysis technique is discussed, and the different types of knowledge seem to be useful in image understanding research are illustrated.

TL;DR: In this paper, the exponential function is used as an alternative to the classical Hermite basis and B-spline bases are constructed in such a way as to allow interchanges between different sets of bases.

TL;DR: An algorithm is presented by which any data set specifying a line drawing may be reduced to a canonical form and any two data sets that specify line drawings that look the same will become identical when reduced to canonical form.

TL;DR: Simple and practicable modifications would give improved picture quality, easier programming, and faster output from the standard line printer.

TL;DR: The IDECS is a computer controllable hybrid analog-digital machine that can display black and white or color images and can do its own image acquisition, enhancement, and combinations.