Patent ID: 6288745
Filing Date: 2001-09-11
Classification: G06T,G09G,H04N

Abstract:
A scanning line interpolation device for converting an interlace signal into a non-interlace signal, comprising:storage means for storing preceding-field image data;reference pixel data extraction means for extracting a plurality of reference pixel data from current-field image data and said preceding-field image data provided from said storage means, said plurality of reference pixel data including pixel data located in an interpolation pixel position which is not present in said current-field image data and in positions surrounding said interpolation pixel position;inter-field motion detection means for detecting whether or not there is motion of an image between a preceding field and a current field, based on said plurality of reference pixel data;in-field interpolation data calculation means for calculating in-field interpolation data associated with said interpolation pixel position based on pixel data in said current field among said plurality of reference pixel data; andinterpolation pixel selection means operative to select said in-field interpolation data when said inter-field motion detection means detects that there is motion, and to select pixel data in said preceding-field image data which is located in said interpolation pixel position when said inter-field motion detection means detects that there is no motion, thereby to output the selected data as interpolation pixel data of a pixel located in said interpolation pixel position,wherein said plurality of reference data comprise central line pixel data which are pixel data derived from said preceding-field image data and positioned on a central line on which said interpolation pixel position is present, and upper and lower line pixel data derived from said current-field image data and positioned on upper and lower lines lying above and below said central line, andwherein said inter-field motion detection means comprises:vertical correlation data calculation means for calculating vertical correlation data indicative of a vertical line correlation which is a pixel data correlation between said upper line pixel data, said central line pixel data and said lower line pixel data; andmotion detection means for detecting whether or not there is motion of the image based on said vertical correlation data.