METHOD AND DEVICE FOR CONVERTING IMAGE

摘要

PROBLEM TO BE SOLVED: To lower code quantity at the time of transmission by discriminating whether or not pixels in an static image are contour lines based on detected characteristic quantity, checking the density of the contour lines and plotting a monochrome image based on discriminated contour line information and contour line density information. SOLUTION: In a characteristic quantity detecting means 13, a density change extracting means 131 extracts density change quantity and sends extracted density change information to a density change information storing means 132 and a contour point extracting means 133 extracts contour points based on the stored density change information. Also, a contour line direction vector extracting means 134 extracts contour line direction vector information and a contour line direction vector information storing means 135 stores the contour line direction vector information. A pixel value converting means 14 converts a pixel extracted by the means 133 into a form that becomes line plotting in the direction of a contour line direction vector in density that is in proportion to the intensity of the density change information. And an image that is converted by the means 14 is outputted from an image outputting means 16.