Showing papers on "Video camera published in 1977"

Color video tape recording/playback system

Abstract: A color video tape recording/playback system with a magnetic tape unit and possibly a color video camera comprises at least one signal storage means, e.g. a charge-coupled device (CCD), for the intermediate storage of the video information, thus enabling the recording to be carried out with a reduced bandwidth or at a reduced tape speed and, if applicable, with a reduction of time base errors. Skip line or skip field methods are used or the grouping of several lines is exploited. The reduction of time base errors during playback is achieved by clocking out the stored signal from the charge-coupled device at the rhythm of the tape speed fluctuations in the tape recorder.

A Simple Hand/Eye Experimental Set-up for Computer Vision Research

Abstract: A simple, low-cost gantry crane robotic platform for use in computer vision research has been developed recently in the Department of Computer Science at the Australian National University in Canberra. The device operates as a mechanical arm, manipulating elements of scenes being scanned by a video camera. Input from the camera is then subjected to computer analysis.

Image registration system for video camera

Abstract: An image registration system for a video camera is used in an optical information retrieval system in a manner to accurately register a pre-recorded image relative to the target of a T.V. camera. A light responsivearray defines the outline of an area corresponding in size and shape to that of the target and the image is simultaneously projected upon both the target and the light responsive array.In the event that the image is off-center with respect to the target, the light responsive elements serve to generate control signals for operating servo motors connected to mirrors for readjusting the light path along each of two predetermined axes. This movement causes the image (which is either transmitted to a monitor or which is later scanned from the target and recorded on a magnetic recording medium or the like) to be precisely centered or otherwise disposed at a predetermined position. According to a second embodiment the light responsive means has been disposed within the monitor whereby upon projection of the image at the monitor is sensed by the light responsive means. If the image is off-center or improperly oriented on the screen, control signals are generated for adjusting the light path transmitting the image into the camera so as to accurately register the image on the face of the monitor.

Measurement of the rotation of a disk from its elliptical projection, with an application to eye movements

Abstract: The elliptical projection of a circular disk, such as the pupil of the eye, on the plane face of a video camera can be used to measure rotation of the disk about a diameter, independently of any translational movements. The algorithm uses the intersections of any three equispaced video lines with the ellipse. Errors and system design are discussed.

Use of video tape in teaching psychological medicine.

Abstract: Video tapes have been used extensively in medical education and especially in training for family practice. This article describes the use of video-tape equipment in rural health centers at the Rockford School of Medicine, University of Illinois, College of Medicine. The video camera was incorporated into clinical transaction by having it operated by a psychiatrist-preceptor in the presence of the patient. This method makes available an intimate glimpse of the clinical situation, less disturbed by intrusive gadetry than has heretofore been possible. Patients seem mostly unaffected by the taping, so long as clinical personnal sanction it, and the function is firmly placed within the supportive bounds of the doctor-patient relationship.

Video observation of a torsion pendulum

Abstract: A video camera, recorder, and monitor were used to record and observe the motion of a dynamic torsion–effusion pendulum. The operator was free to tend to the conditions of the experiment; data from the pendulum were obtained subsequently from the video record. Results are presented from a test of the method with no effusion occurring.

Measurement of head movement during auditory localization

Abstract: A system has been designed to track human‐head movement response to sound originating at different azimuth locations with respect to the head. A videotape record is made of a “point‐source” light carried on a small, lightweight “beanie” mounted on the listener's head. Movement of the head generates an equivalent movement of the light which is being monitored by the video camera and recorded on tape. Also, speaker location, time, and actual sound signal are recorded. Circuitry has been designed which determines the x‐y coordinates of the spot image with respect to the video synch pulses. These are available from a modified video monitor either in real time or from tape replay. This same circuitry interfaces to a computer programmed to take the coordinate and timing information, apply a calibration and process the data into time‐varying head position and velocity. Both digital and graphic outputs are available and examples of graphic printout of typical head movement response are given. System hardware and programs are capable of expansion into 3‐axis operation.