Showing papers on "Object detection published in 1977"
TL;DR: The US Color Television Standards represent masterful "tradeoffs" among psychophysical effects and electronic implementation techniques.
Abstract: The US Color Television Standards represent masterful "tradeoffs" among psychophysical effects and electronic implementation techniques.
36 citations
27 citations
TL;DR: In this paper, the authors investigated different sources of noise and their influence on image quality and derived the ultimate limits in spatial and density resolution of a two-dimensional layer of a three-dimensional object.
Abstract: A two dimensional layer of a three dimensional object can be reconstructed by means of a large number of projections through this layer using a convolution technique. The quality of the reconstructed image is limited by noise in the primary projection data. Different sources of noise have been investigated. Their influence on image quality is calculated. Ultimate limits in spatial and density resolution are derived.
19 citations
01 Dec 1977
TL;DR: Using an approach related to fuzzy set theory, this technique has been significantly improved and bitmasks corresponding to images of a car and a pedestrian as well as their trajectories have been extracted from this sequence - without using scene specific knowledge about the moving objects or the stationary scene components.
Abstract: A technique to separate images of non-stationary from stationary components in a TV-frame sequence of a real world scene had previously been reported [1]. Using an approach related to fuzzy set theory, this technique has been significantly improved. Analyzing TV-frames representing a downtown street intersection for one second, bitmasks corresponding to images of a car and a pedestrian as well as their trajectories have been extracted from this sequence - without using scene specific knowledge about the moving objects or the stationary scene components. Similar results have been obtained for other TV-frame sequences. This approach may contribute to an algorithmic solution for the "peripheral vision" problem, i.e. to detect a moving object in the field of view, and for the "attention focussing" problem, i.e. to decide which part of the images in a sequence to investigate in detail.
10 citations
01 Jan 1977
TL;DR: The impact of the vision hardware on the stereo vision system and in turn the impact on the robot system is described.
Abstract: Attention is given to the robot stereo vision system which maintains the image produced by solid-state detector television cameras in a dynamic random access memory called RAPID. The imaging hardware consists of sensors (two solid-state image arrays using a charge injection technique), a video-rate analog-to-digital converter, the RAPID memory, and various types of computer-controlled displays, and preprocessing equipment (for reflexive actions, processing aids, and object detection). The software is aimed at locating objects and transversibility. An object-tracking algorithm is discussed and it is noted that tracking speed is in the 50-75 pixels/s range.
5 citations
Patent•
07 Nov 1977
TL;DR: In this article, a plurality of object detection points is used to detect an object in a pickup screen of a TV camera and the outputs of those points are extracted to discriminate the entrance and exit of detected objects to and from the detected region.
Abstract: PURPOSE: To make it possible to detect accurately an object only by setting a plural number of object detection points on the pickup screen of a TV camera and by extracting outputs of detection points sequentially corresponding to the moving direction and speed of a detected object. CONSTITUTION: A detection region within the movement path of moving detected object 1 is picture-taken by TV camera 2, whose pickup screen is provided with a plural number of object detection points 27. Then, detection outputs of those detection points 27 are extracted 28 staggering the time corresponding to the moving direction and speed of detected object 1, thereby discriminating the entrance and exit of detected object 1 to and from the detected region. Consequently, only detected object 1 can be detected precisely in case of disturbance such as the entrance of a body moving at a different speed with that of detected object 1 into the detection region. COPYRIGHT: (C)1979,JPO&Japio
4 citations
01 Aug 1977
TL;DR: A computer simulation of frequency swept holography shows a properly scaled, divergent synthetic aperture generated by frequency sweeping a linear array of synchronous detectors is employed in imaging a rectangular object.
Abstract: A computer simulation of frequency swept holography is presented. A properly scaled, divergent synthetic aperture generated by frequency sweeping a linear array of synchronous detectors is employed in imaging a rectangular object. An undistorted and edge enchanced image of the object is reconstructed and compared with earlier results. The edge enhancement effect in the image is explained.
2 citations
01 May 1977
TL;DR: A mathematical model developed for a computer simulation of both side-looking and forward-looking high resolution sonar systems is described to permit systematic examination of the effects of first-order parameter variations on sonar image quality and target detection capability.
Abstract: A mathematical model developed for a computer simulation of both side-looking and forward-looking high resolution sonar systems is described. The purpose of the simulation is to permit systematic examination of the effects of first-order parameter variations on sonar image quality and target detection capability. The model permits specification of the major parameters such as height above bottom, bottom reflectivity, projector power and directivity function, receiver array geometry, number of receiver elements, shading, detection bandwidth, and display characteristics. Details of the model and representative simulated displays for various sonar parameter combinations are presented.
1 citations
Patent•
18 Mar 1977
TL;DR: In this article, an ultrasonic wave is emitted, and the phase difference revolution between the receiving signal and proofreader signal is used to give an alarm, thus, stability against external noise as well as circuit simplification can be ensured.
Abstract: PURPOSE:An ultrasonic wave is emitted, and the phase difference revolution between the receiving signal and proofreader signal to give an alarm. Thus, stability against external noise as well as circuit simplification can be ensured.
1 citations
TL;DR: This poster presents a probabilistic reconstruction of the response of the immune system to repeated exposure to EPFL-TALK waves and shows clear patterns of decline in the number of immune responses to EMTs.
Abstract: Reference EPFL-TALK-158603View record in Web of Science Record created on 2010-11-25, modified on 2017-05-10
01 Dec 1977