Showing papers on "Line segment published in 1971"

Optimal Curve Fitting With Piecewise Linear Functions

Abstract: A method is described for determining an optimal straight-line segment approximation to specified functions for constrained and unconstrained endpoints.

The misperception of angles: Estimating the vertex of converging line segments

Abstract: Estimates of the point of intersection of converging line segments depended upon the angle between lines and the orientation of the display. Main conclusion: The tilt of a line is perceptually altered to appear more nearly parallel to the more closely aligned axis, either horizontal or vertical, of an O’s visual field.

Integer-valued entire functions

Abstract: The theory of integer-valued entire functions is organized in an improved fashion. Detailed results are proved when the indicator diagram is a line segment. For the first time, a method is developed for treating completely integervalued functions with an unsymmetrical growth pattern.

Optical line scanner and facsimile system

Abstract: To scan a long line of printed information, a fiber-optic lineto-rectangle converter is configured at one end to divide a long scan line into a plurality of shorter segments which are arranged at the opposite end to form an array composed of consecutive segments stacked in parallel. Since the array covers an area instead of a line, a video camera tube scanning the array utilizes more of its useable face area thus improving image resolution for the converted line. To operate a helical bar printer having as many hammers as line segments in the converter, the rectangular image is scanned with a series of horizontal sweeps orthogonal to the line segments. With each sweep, the hammers are fired simultaneously in response to video signals indicative of the light level at corresponding positions in each line segment.

Character generator for producing characters on the screen of a cathode-ray tube

Abstract: Ultra-rapid character generator for use with a cathode-ray tube operating on straight line segments and equipped with a permanent store from which by means of a store word address a character codeword is passed to a transfer register, which transfers the relevant character codeword sequentially in a number of relevant groups of 5 bits to a decoder, 3 bits determining 8 line segment directions, 1 bit determining a single or double line segment length and 1 bit determining the display or non-display.

Target display for pulse-echo return system

Abstract: This invention relates to target displays for use in pulse-echo return systems such as radar and sonar systems. In this display a plurality of echo return or target signals are simultaneously displayed with each signal represented as a short straight directed line segment, the center or one end point of such line segment being positioned on the display screen with one coordinate determined by target range (pulse transit time) and the other coordinate determined in accordance with total elapsed time since transmission of the pulse resulting in that particular target return signal. The slope of each directed line segment is made proportional to target radial velocity (range rate) as determined by doppler shift of the return signal, and the intensity of display of the line segment is made proportional to the return signal amplitude. Return signals which correlate in range, in range rate and in signal amplitude then appear as a series of directed line segments connecting or very nearly connecting with each other to form a substantially continuous and readily identifiable target track while noise signals appear as unconnected lines of random orientation.

Network data, geographic coding capabilities, and area systems

Abstract: ELEMENTS OF THE ACG (ADDRESS CODING GUIDE) AND DIME (DUAL INDEPENDENT MAP ENCODING) FILES AND THE ADMATCH (ADDRESS MATCHING) COMPUTER SYSTEM ARE DESCRIBED AND THEIR RANGE OF APPLICATIONS DISCUSSED. ACG/DIME NETWORK DATA ARE CLASSIFIED INTO THREE BROAD CATEGORIES: CHARACTERISTICS OF THE LINE SEGMENTS THAT COMPOSE THE INDIVIDUAL ELEMENTS OF THE NETWORK, CHARACTERISTICS OF THE END POINTS OF THE LINE, AND INFORMATION ABOUT THE AREAS ON EITHER SIDE OF THE LINE SEGMENT. EACH LINE SEGMENT HAS A NAME OR OTHER VERBAL DESCRIPTION AND CLASS, SUCH AS STREET, RAILROAD, CITY LIMIT, OR FREEWAY. OTHER DATA CONSIDERED SPECIFIC TO THE LINE ITSELF ARE ITS LENGTH, ZIP CODE, AND UNIQUE SEQUENCE NUMBER. ADDITIONAL SPECIFIC DATA CAN BE ADDED FOR TRANSPORTATION PLANNING PURPOSES, SUCH AS NUMBER OF LANES, ROAD SURFACES, SPEED LIMITS, ETC.. THE ACG ELEMENTS OF THE NETWORK DATA ARE THE SEGMENT NAMES, ADDRESS RANGES, ZIP CODES, AND GEOGRAPHIC CODES. DIME IS THE PROCESS BY WHICH THE SEGMENT IS ORIENTED, THE INTERSECTION NUMBERS ADDED, AND THE TWO SIDES BROUGHT TOGETHER. COORDINATES ARE SUBSEQUENTLY DIGITIZED FOR EACH INTERSECTION AND ADDED TO THE FILE. THE SMALLEST ADMATCH PROGRAM, WHICH WILL RUN ON IBM 36/25 DOS, IS DISTRIBUTED BY THE BUREAU OF THE CENSUS FOR $60. ALL PROGRAMS ARE WRITTEN IN 360 ASSEMBLY LANGUAGE.

Arrangement for reducing errors in dounting line segments of a zigzag line diagram

Abstract: To reduce errors due to surface imperfections of a zigzag line diagram, the line diagram is scanned along two parallel paths parallel to the center line of the diagram and on opposite sides thereof. The scanning means therefore alternately generate pulse pairs. Logic circuits select the second one of each pair as a counting signal. The selection takes place only if a pulse generated by the other scanning means and a pulse by the scanning means from which the counting pulse is to be selected precede the counting pulse. The so-selected counting pulses are counted and the results stored.