To prevent not only the generation of a pattern habit but also the generation of the discontinuous feeling of patterns in a joint by forming unidimensionally arranged image data wherein sand particle pixels corresponding to sand particles are unidimensionally arranged and converting this image data to a gravure carving data system to form carving data.
When an image treatment condition is set by an image processor (S1), unidimensional image particle equal arrangement is performed by an image particle equal arrangement part (S2). Subsequently, the random displacement of respective particles (sand particle pixels) is performed by an image particle random displacement part (S3). Next, adjacent pixels (in the vicinity of 6) are removed by an adjacent pixel removing device (S4). Subsequently, the expansion of one pixel to four pixels is performed by a number-of-pixel expansion device (S5). Next, a scanning direction is converted in order to match the scanning direction of image data with the scanning direction of a carving device by a scanning direction conversion part (S6). By this constitution, carving data is supplied to the carving device (S7).
OKAMOTO MASARU
SUKEGAWA YOSHIO
