Showing papers on "Channel (digital image) published in 1979"

Conversion of acoustic signals into visual signals

Abstract: For displaying spoken words as color pictures on a screen, each audio frequency, i.e. each acoustic sound, is assigned a respective color hue and each audio frequency spectrum a respective color mixture, by conducting acoustic signals through a three-channel triangular filter, each channel having a different central frequency, and controlling the intensity of a respective electron beam of a color television monitor as a function of a respective filter channel output.

Two-channel model of image processing in the human retina

Abstract: A model describing the decomposition of imagery in the human retina is developed basedon the retina's cellular structure. Two types of retinal cells, horizontals and amacrines,perform spatial averaging across the retina to form a low -pass image channel. This lowspatial frequency information is fed back to the retina's receptor cells to form a differ-ence channel of high- passed spatial frequencies. Such a model is suggested by electro-physiological as wll as psychophysical evidence. Analysis of the model characterizes thelow -pass channel as a constrast channel and the difference channel as an edge detection channel. Application of the model to image quality assessment suggests a two factorapproach involving metrics in the model's eye domain.IntroductionBecause of its great importance to our perception of the outside world, human vision hasbeen seriously studied for centuries and is being studied today by many scientists in avariety of disciplines. Each line of vision research is aided by the dictates of itsdiscipline, but in the process becomes limited by them as well. An experimental psycholo-gist, for instance, studies vision by presenting light stimuli and recording the observers'responses, but he is then limited to input /output descriptions of visual behavior.

Color television picture receiver

Abstract: PURPOSE:To secure the simultaneous projection for the color picture image of the secondary channel at part of the color picture image of the main channel by reading out the video and chrominance signals of the secondary channel in the higher speed than the writing from the memory unit and then compressing the time axis. CONSTITUTION:At the main channel, and video signals received and processed at tuner 2 or video amplifier circuit 6 for reception use plus three chrominance signals supplied to pickup tube 17. And color picture image A of the main channel is projected at the primary part of screen 50. While at the secondary channel, the three chrominance signals received and processed through reception tuner 18 or video amplifier circuit 22 plus the video signal are supplied to memory units 26- 29 and then written with control 30 to be then read out in a speed three times as high as the writing speed. Then each chrominance signal plus the video signal with the time axis compressed to 1/3 are led out from units 26-29 to be supplied to picture tube 17. Thus, the secondary channel color picture image B of 1/3 size is projected simultaneously at part of main channel screen as shown in screen 50.

Stereoscopic color television transmission and reception system

Abstract: An object is picked up by five color television cameras. The video signal of the central camera is transmitted and received via a means having approximately the same constitution as an existing color television system. A signal of the differences between the video signal of the central camera and the video signals of the other four cameras disposed at both sides of the central camera is prepared. A frequency is then chosen which is lower by an integral fraction than a color sub-carrier in a lower side band of the assigned channel, the spectral distribution of which frequency has an interleaving relationship with the spectral distribution of the brilliance signal of the central camera. This frequency is then separated into two carriers having a phase relationship of two phases to one another, ten half waves and one half wave of the respective phases are amplitude-modulated individually with the above four video difference signals, then superposed, and the bands are so limited in transmission that the synthesized waves do not exceed the band width of the assigned channel. A receiver side demodulates the five video signals from the video signal of the central camera and the four video difference signals. Then, these signals are arrayed in the next 1 Hz in delay by 1 Hz of the color sub-carrier at every 60` of the phase by a delay circuit, electron beams of three primary colors arrayed in a longitudinal row are synchronously shifted horizontally with the five video signals, and a picture having a stereoscopic relationship with the focus plane of a lenticular lens to each other is reproduced.

Method and apparatus for converting acoustic signals into optic signals

Abstract: For displaying spoken words as color pictures on a screen, each audio frequency, i.e. each acoustic sound, is assigned a respective color hue and each audio frequency spectrum a respective color mixture, by conducting acoustic signals through a three-channel triangular filter, each channel having a different central frequency, and controlling the intensity of a respective electron beam of a color television monitor as a function of a respective filter channel output.