Scan converter with adaptive vertical filter for single bit computer graphics systems

摘要

A television scan conversion method receives and stores incoming pixel bits are stored in a pixel memory array at a first scan rate. Vertical columns of adjacent pixel bits of plural scan lines from the pixel memory array are read out at a second scan rate. A filter coefficient is generated by detecting a bit pattern located in each vertical column of pixel bits retrieved from the pixel memory array. Delay matched predetermined adjacent groups of pixel bits in each vertical column are adaptively low pass filtered in response to the filter coefficient so as to minimize video flicker artifacts in a resultant stream of interpolation pixels in accordance with the bit patterns detected by the pattern recognition filter coefficient generator. An interpolation coefficient is generated for each interpolation pixel, and plural-bit interpolation pixels are put out as a stream at the second scan rate.