Patent ID: 7034840
Filing Date: 2006-04-25
Classification: G09G

Abstract:
1. A circuit for downscaling a source image in both horizontal and vertical directions to generate a destination image, comprising: an input processing unit, adapted for receiving said source image, providing image data at a first access frequency; a horizontal direction image processing unit, electrically coupled to said input processing unit, receiving said image data at said first access frequency from said input processing unit and downscaling said image data in said horizontal direction to generate first temporary image data at said first access frequency; a first stage line buffer unit, electrically coupled to said horizontal direction image processing unit, temporarily storing said first temporary image data at said first access frequency, wherein said first stage line buffer unit comprises a plurality of line buffers in series for periodic storing of said first temporary image data in each of said line buffers; a vertical direction image processing unit, electrically coupled to said first stage line buffer unit, receiving said first temporary image data at said first access frequency from said first stage line buffer unit and downscaling said first temporary image data in said vertical direction to generate second temporary image data at said first access frequency; a second stage line buffer unit, electrically coupled to said vertical direction image processing unit, temporarily storing said second temporary image data at said first access frequency; and an output processing unit, electrically coupled to said second stage line buffer unit, reading said second temporary image data from said second stage line buffer unit at a second access frequency to generate said destination image.