Abstract: An image processing apparatus comprises image data input means and processing means for processing an input image data. The processing means includes image content discrimination means for discriminating whether the input image data represents a half-tone image, a line image or a combination thereof.

Abstract: An image processing apparatus has an input section for converting input image information into a luminance signal, a memory to store the digitized luminance signal, a central processing unit for determining the matrix size for each picture element of the input image information so as to allow output of high space frequency components of input image information with matrices of small size and low space frequency components with matrices of large size, an outline emphasis circuit for emphasizing the outline when the image information is output with matrices of large size, and an output section for recording or displaying the input image information. Halftone images of excellent resolution and gradation can be output with a small memory capacity.

Abstract: A sprinkler for a vent section or part of an ascension pipe of a coke oven which is disposed in the vent pipe of a horizontal coke oven chamber ascension pipe and comprises a sprinkler nozzle body which is a substantially straight pipe and is disconnectably fitted to a hole formed in the vent pipe through a male screw which is formed on an outer wall of the sprinkler nozzle body being screwed to a female screw formed around the hole in the vent pipe. One or more spray holes for spraying water in the radial direction of the axis of the nozzle body are formed at the end of the nozzle body extending into the vent pipe. A male screw, formed at the rear of the nozzle body extending outside of the vent pipe, and a branch pipe, which is branched from the main feed pipe supported on another member equipped on an oven roof, are disconnectably connected by a pipe joint member.