Patent ID: 6970204

Claim:
An image magnifying circuit for horizontally enlarging image data inputted by sampling for a horizontally enlarged display of an image, said circuit comprising an image memory for storing inputted image data, a coefficient memory for storing predetermined filter coefficients corresponding to a plurality of magnifications, a non-linear magnification controller for outputting an enable signal to read out corresponding image data from the image memory according to any given magnification set for n number of equal areas, each area having a width w provided by dividing the image to be displayed by n, n being an integer of at least 2, and outputting a coefficient selection address to read out a corresponding filter coefficient from the coefficient memory and a filter for filtering the image data read out from the image memory according to the filtering coefficient read out from the coefficient memory and outputting image data processed for enlargement according to any magnification set for each of the n number of areas arranged horizontally, wherein the coefficient memory comprises a Read Only Memory for storing the predetermined filter coefficients, a memory controller for reading out the filter coefficients from the Read Only Memory according to a transfer start signal and outputting a coefficient writing address and a Read/Write selection signal, a selector selecting either of the coefficient selection address outputted from the non-linear magnification controller or the coefficient writing address outputted from the memory controller, and a coefficient Random Access Memory for storing the coefficient writing address read out from the coefficient Read Only Memory according to the coefficient writing address outputted from the selector when the Read/Write selection signal is a Write selection signal and reading out the filter coefficient according to the coefficient selection signal outputted from the selector when the Read/Write selection signal is a Read selection signal.