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블럭탐색 제어를 이용한 프랙탈 영상 부호화 시간 향상과 컬러 영상에의 응용
박철우,정동웅,김태형,김두영 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1
In this paper, in order to reduce block search area during the process to determine the coefficient of IFS transform equation in Fractal Coding, We performed the following steps : First, We partitioned Domain blocks and Range blocks with certain critical point determined by the edge characteristcs and the direction of brightness. When similar block's detected, the Domain block in the same class of the given range was only searched. Second, When the processing is on, We determined the linear list structure with the second error limit, We, therefore, could control coding time, We tryed to improve the compression rate of the Image with reducing the number of times of tranformation by changing the area of block with Quadtree Partitioning, and also tried to progress the fidelity of the image by changing the search density of search area, according to the magnitude of range block. We applied these method to image compression of 24-bpp color. First of all, after converting the RGB coordinate into YIQ Coordinate which has brightness signal and chrominance signal, We minimized by a quarter and coded I,Q signal which implies the information of the color but takes just small part at image information and on the case of decoding, with linear interpolation method we got I,Q signal enlarged as it was. All throughout these processing, We could find out that There are no damages on the original image, and we are able to make better result on compression rate and fidelity of image comparing with those of conventional Fractal Coding method which was applied to the RGB images.
생사(生絲)의 조사장력관리(繰絲張力管理)에 대(對)한 연구(硏究)
최병희 ( Byong Hee Choe ),정동웅 ( Dong Ung Chung ) 한국잠사학회 1973 한국잠사곤충학회지 Vol.15 No.2
자동조사기가 개발된 이래 조사장력이 소위 철선생사와 관련된다 하여 중요시 하기에 이르렀다. 특히 고속조사에서 생사의 물리적 성질을 악화시킨다 하여 물의를 일으키고 있다. 본 보고는 한국잠견으로서는 최초로 조사장력과 조사속도의 관계를 고찰하게 되었고 얻어진 결과는 다음과 같다. 1 한국생사는 아직도 철선생사와는 거리가 멀고 정상적인 생사로 인정된다. 2. 한국생사제조에서 고속화가 되지 못하는 주요원인은 사조고장이고 특히 조사용견의 비상견 및 견층분리현상에 기인하며 이것은 원료견질과 관계가 있다. 3. 현단계에서의 적정 조사속도는 190회/분 내외이며 조사장력으로 따지면 0.4∼0.5g/d이다. 4. 본 보고에서 조사한 조사장력과 조사속도와의 관계는 제7도와 같은데 관계식으로서는 A. 조장력측정의 경우 Y=5.0831+0.0381X(단, Y:장력 g/21d, X:조사속도 m/min) B. 해서장력측정의 경우 Y=3.1922+0.0175X(단, Y:장력 g/21d, X:조사속도 m/min) 이었다. 5. 해서장력과 고차저항은 거의 같은 비율로 총 조사장력을 구성하였다. Since automatic silk reeling machine has been used in the fold, silk reeling tension has been considered to be an important matter. Such silk reeling tension affects on the physical nature of silk which would be Wire Silk in case of super high reeling velocity. This will be a report regarding with the silk reeling tension used Korean cocoon and various analyses are carried out where reached to following results. 1. Korean silk is still far from Wire Silk yet produced as general silk. 2. There is more possibility to increase silk reeling velocity if cocoon nature is improved. 3. At present, it is considered that the optimum reeling velocity is to be about 190 r.p.m. which is corresponded with 0.4∼0.5 g/d silk reeling tension. 4. This report has prepared a silk reeling tension contolling diagram against reeling velocity as shown at Figure 7. The mathematical relations between them are; A. in case of total silk reeling tension; Y=5.0831+0.0381X(Y; total reeling tension, g/21d, X; reeling velocity, m/min) B. in case of initial silk reeling tension; Y=3.1922+0.0175X (Y; initial reeling tension, g/21d, X; reeling velocity, m/min) 5. The main problems for the increase of silk reeling velocity is considered to be Break Down of Silk Reeling Ends caused by Cocoon Jumping or Cocoon Layer Seperation during the silk reeling work. Such troubles are concerned with the produced cocoon nature.