JPS6424568A - Interpolating circuit for picture data - Google Patents

Abstract

PURPOSE:To obtain a high definition image in which a slanting line and a curved line are smoothly expressed by making the data, etc., to instruct the value of the picture element of the periphery of the picture element, which goes to the reference of a processing, and the position of the picture element after conversion into two data and outputting the value of the picture element corresponding to it as interpolation data. CONSTITUTION:Into a table memory 51 and a table memory 5R, data are written beforehand so that the output data corresponding to the given input data can be the interpolation data, and in the sequence, into address input terminals A0-A8 of the table memory 5L, a counted value output G0 of a picture element ring counter 2, counted value outputs LA and LB of a line ring counter 3 and outputs NI, NH, PI, PH, SI and SH of shift registers SR0, SR1 and SR2 are given as input data. On the other hand, in the sequence into address input terminals A0-A7 of the table memory 5R, the counted value output G0 of the picture element ring counter 2, the counted value outputs LA and LB of the line ring counter 3 and outputs NJ, NI, PI, PJ, PI and SH of shift registers SR0, SR1 and SR2 are given as the input data. Thus, it is avoided that the slanting line and the curved line are expressed in a saw tooth wave shape and the high definition image can be obtained.