Patent ID: 6124875
Filing Date: 2000-09-26
Classification: G06K,H04N

Abstract:
A printer comprising:storing means for storing input video data corresponding to a plurality of successive print lines to be printed to form an image;a line head having a plurality of light points aligned in a single line for producing the successive print lines;first subline data generating means for sampling said input video data of one print line and for generating data for each of a plurality of sublines of said one print line;supplying means for sequentially supplying said first subline data for one print line to the light points of said line head to successively drive said light points to form a print line;designating means responsive to said input video data for outputting a correction signal when a correction of line width of a print line is required;second subline data generating means for generating second subline data from said input video data of a print line which precedes said one print line in the order of successive print lines to be printed, to replace said first subline data for line width correction of said one print line;replacing means responsive to said correction signal for replacing said first subline data of said one print line to be supplied to said light points of said line head with said second subline data;image forming means which is scanned in a first direction by said line head and including means for moving said image forming means in a second direction intersecting said first direction so as to be scanned in said second direction,said designating means produces said correction signal to designate the line width correction in at least one of said first direction and said second direction, and said second subline data generating means is responsive to said correction signal to generate said second subline data for the line width correction, whereby said replacing means replaces said first subline data with said second subline data in response to said correction signal;wherein said second subline data generating means includes first means for generating said second subline data for line width correction in said first direction,said designating means includes first outputting means for outputting a first correction signal for designating the line width correction in said first direction, andsaid replacing means includes first replacing means for replacing said first subline data with said second subline data from said first means in response to said first correction signal, andwherein said second subline data generating means includes second means for generating said second subline data for line width correction in said second direction,said outputting means includes second designating means for outputting a second correction signal for designating the line width correction in said second direction, andsaid replacing means includes second replacing means for replacing said first subline data with said second subline data from said second means in response to said second correction signal.