Method for Producing a High Resolution Image
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2005-Feb-15
This article describes a method for producing a high resolution image from a low resolution image in which an analog level of each picture element (pel) of an original image is detected and the binary bits representing the number of black and white pels in the high resolution image are generated based upon the detected analog level. Fig. 1 shows pels of an original document image generated by an image scanner (not shown). Pel PX represents the current pel being processed, and pels PA, PB, PC and PD represent neighboring pels of the current pel PX. Binary bits representing a level between a white level and black level are generated, and a high resolution pel PX', including four small pels P1, P2, P3 and P4, is produced based upon the data of the pel PX, as follows.