Abstract: The objective of the invention is to provide a three-dimensional data display apparatus that easily saves an entire or a portion of the display state of the graphics, so that the data can be selected and restored according to the instructions of the user.

Abstract: Reversible encoding with a high compression rate is fast performed for images produced by a computer. The following processing is performed for each line. First, prediction is performed based on a first prediction method, it is determined whether the prediction value matches the pixel value of a target pixel, and if so, a code indicating the first prediction method is outputted. If a prediction value by the first prediction method does not match the pixel value of the target pixel, prediction values by second and subsequent prediction methods are obtained for the first time, and these values are compared with the pixel value of the target pixel. If there is a matching prediction value, a code indicating a corresponding prediction method is outputted. If the pixel value of the target pixel does not match any prediction values, a prediction error is outputted.

Abstract: A method and an apparatus for color adjustment, in which color adjusting coefficients for respective colors are added to color correction signals in a coefficient matrix, in the matrix masking for the color correction and color adjustment. Further, the sum of the color adjusting coefficients in each row in the coefficient matrix is zero. By this feature a gray level in the original image can be maintained even after the color adjustments. Additionally, the chroma check is made in the color adjustment. This feature prevents the color adjustments from influencing the complementary colors. Only the intended color can be adjusted independently of other colors. Accordingly, the color adjustment is easy and does not require any professional skill.

Abstract: The image processing method and related apparatus of the present invention contemplates the steps of setting a two-dimensional image filter to center around a subject picture element switching the coefficient of the two-dimensional image filter on a time-sharing basis during the time an image signal corresponding to one picture element is transferred, taking out a plurality of filter outputs relative to the image signal of the subject picture element, comparing the plurality of filter outputs with each other to identify which one of the character and half tone areas the subject picture element belongs to, and subjecting the image to individual process on an area basis. Accordingly, it is possible to distinguish between the character and half tone areas efficiently with a simple arrangement and simultaneously output an image of good quality.

Abstract: Color adjustment factors are set according to the color separation signals of an original picture and factors for each separation signal set equal to the absolute value of the sum of the factors corresponding to the other separation signals but of opposite polarity adjustment factors. The color separation signals and the color adjustment data are added to the output densities which are provided before color adjustment so that the color adjustment can be achieved.