The image processing method converts an input image in which multiple-value gradation values are assigned to pixels, into a dot image, by performing processing for converting each of the pixels of the input image into a dot pattern of a pixel block composed of a plurality of binary pixels. The search-independent processing of packet information in parallel with search operations can be repeated at each stage of the array. The image capturing device captures an image of a pattern under measurement in a measurement area of the platform. By this configuration, the lead can be held without fail, and a satisfactory operation of the lead delivery can be attained. Consequently, the size of the shutter device in a direction perpendicular to the traveling direction of the shutter can be reduced. and pressures of from 100 to 400 bar, which is characterized in thata) one reactor is operated at temperatures above 160\xb0 C.