This paper presents many reversible data compression methods for pre-press images. At first, pre-processing algorithms which make data compression before image coding are shown. Next, bit plane image coding algorithms and bit assignment algorithms are introduced. Last, image coding methods using density data are shown. These methods are effective for computer generated images. Generally, these reversible methods can be taken about 50% compression ratio for natural images.

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An efficient edge following algorithm is presented. The algorithm is a sequential onepass procedure. Using the average of the merit (mainly edge strength attached to individual point) as the evaluation function, it finds a near optimal edge line between two points on gray scale digitized images. The algorithm can be used iteratively to extract edge line of a region specified roughly by a number of points. It is typically applicable for the edge line drawing of cut mask making. Generally, finding an optimal path between two separate points is to minimize or to maximize the merit function. The merit function is given as the sum of the merit on the path. So it likely finds a shorter path as optimal in minimization or a longer path in maximization. In that sense the average of the merit on the path is a better evaluation function in finding an optimal path. The divisions in the averaging, however, are a drawback. A large number of divisions sacrifice the processing speed. Some consideration is made to avoid the divisions. A number of experiments are done with good results.

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Efficient pattern cutting of plane figures is an industrial problem which appears whenever cutting of material is necessary. The authors are constructing a system to cut alphabet patterns efficiently from an adhesive plane sheet. It is a kind of automatic pattern cutting systems. This paper presents the results of a basic simulation of pattern cutting by a personal computer. In this simulation the calculation of the positioning is carried out automatically by the vertical connection of the patterns. The English names of some Chinese cities are used as the samples for the simulation. The compression ratio of the areas of material in the simulation is about 70 percent.

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The internal dynamics of Kyser type ink jet print head were studied about pressure and ink velocity theoretically and experimentally. The two models were used for this analysis. The fluid in the ink-chamber is modeled as a lumped parameter system which contains masses, passive compliances and damping elements to analyze the pressure. The jet velocity is analyzed as laminar flow between two walls using the equivalent column length by Beaslay. The waveforms of the pressure and the velocity in the ink-chamber are calculated numerically using these models. The results are well in agreement with the experiment. The analysis shows that the fluid resonant frequency is depend on the length of the ink-chamber, and the ink viscosity needed for this type print head is about 3.0cP-3.5cP.

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This paper provides the reseach of photo-coupling materials for color filters which are used for CCD color TV cameras or liqied-crystal displays. Photo-coupling materials consist of aromatic azido compounds (p-Azido dimethyl-aniline), couplers (1-Naphthol) and transparent polymers. These materials make colored paterns by UV irradiation which causes coupling reactions of aromatic azido compounds and couplers. Adapting these materials to color filters, we respect that color filters would be made without the processes of dying the paterns made by UV irradiation and protecting them.

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