In this paper, we technically investigate the possibility of an international digital HDTV transmission via INTELSAT satellite by a small earth station, using a 120/140Mbps compact HDTV codec developed by KDD. First, a configuration of the codec is explained and its coding performance for transmission error is cleared. And then, the link budgets are designed for 4 kinds of beam connectivity between U.S.A. and Japan. From these results, the digital transmission of HDTV programs is confirmed to be quite feasible by the small earth station.
Hi-Vision is an expected new media the broadcast of which will start in 1990. The system is also expected for the use of industrial application. For these requirement, 54-inch, 110-inch, and 200-inch projection displays have been developed. The horizontal resolution of 1000-TVline, the peak brightness of 410 cd/m^2 (54-inch) , and the contrast ratio of more than 100 for rear projection displays can be realized by the development of 9 -inch hybrid focusing projection tube, high resolution projection lens, fine pitch high contrast rear screen and large output horizontal deflection circuit etc..
This paper describes the recent trends of High-Definition TV (HDTV) transmission technologies. The HDTV signal bandwidth is extremehy wide and the source bit rate is about 1.2 Gb/s (studio quality). or 600 Mb/s (distribution quality). For analog transmission, bandwidth compression methods based on various sub-samplings have been studied. For digital transmission, bit rate reduction coding methods have been studied. Experiments of HDTV transmission have been carried out using satellite circuits and optical fiber Lines.
This paper describes about a video processor for personal computer which displays characters, graphics and motion pictures in NTSC signal at the same time in any form at anywhere on the personal computer display. And this system has many functions that are trimming, real-time magnifcation and reduction, mosaic, superimpose, picture freezing, logical operation between motion pictures in NTSC signal and graphics. Moreover, this system has NTSC signal output and you can record multi-media picture on your VTR. This system will be applied for CAI(Computer Aided Instruction) or presentation by personal computer etc..
In this paper, we propose a method of texture analysis for nonwavon fabric photomicrograph images, for the purpose of extracting emboss-areas from them. The method which yields a recognition rate of 92.5 percent is based on ISODATA clustering method, which is performed by logical analysis of clustering result for various block-sizes. For clustering we use two features, one is Practal Dimension which represents Fractal quantitatively, the other is 2nd Feature which is defined In this paper, like a mean of gray level.
Recently we use Image processing systems in the laboratories and offices. But they're very difficult to use, and sometimes very expensive. Now we have developed the image processing system combined with the personal computer. With this system, we can use mouse to prompt for process images watching at the menu on the CRT. In addition that, it has the function to make suggestions for good image processing,so that it is very easy to use.
An efficient image compression and reconstruction system for medical images is inevitable to extend the application range of PACS. We have deteloped an image reconstruction display which can reconstruct images of good quality at high speed and communicate with host through BMC channel. The reconstruction unit of the display consists of four microprocessors on which our hybrid algorithm is Implemented in pipeline. By the experiments using the prototype system, the display was verified to be effective: It takes less than 5 seconds for 10 to 1 compressed image to transfer and to reconstruct the image, while taking 10 seconds for the original image.
Adaptive Discrete Cosine Transform progressive Coding Scheme(ADCT-PCS) codes an original image in several stages. At the first stage, the subsampled original image is coded at low bit-rate. By decoding this coded image, receiver can get the low quality decoded image very early. At each later stage, the residual error image(REI), i.e. the error of the decoded image, is coded. Rceiver can improve the decoded image quality by using the decoded REI. After the second stage, however, the values of some areas of REI often become very small. So if these small value areas of REI are skipped, the coding efficiency of ADCT-PCS will be increased. The present report proposes a method of improving the REI coding algorithm for ADCT-PCS.