Abstract: A printer including a transport system for a recording medium, a printhead containing a plurality of print units each of which being capable of printing a pixel line when the printhead is scanned over the recording medium, and a failure compensation unit for controlling the print operation such that a failure of a print unit is compensated, wherein a segmentation unit is provided for dividing an image to be printed into segments containing different types of image information, and wherein the failure compensation unit includes a memory for storing a plurality of compensation strategies and a controller for selecting one of said compensation strategies in accordance with the segment to be printed.

Abstract: A printer including a transport system for a recording medium, a printhead containing a plurality of print units each of which being capable of printing a pixel line when the printhead is scanned over the recording medium, and a failure compensation unit for controlling the print operation such that a failure of a print unit is compensated, wherein a segmentation unit is provided for dividing an image to be printed into segments containing different types of image information, and wherein the failure compensation unit includes a memory for storing a plurality of compensation strategies and a controller for selecting one of said compensation strategies in accordance with the segment to be printed.

Abstract: A method of compensating for the failure of a dot generating unit in a printing system including a multiple-unit printhead scanning an image receiving medium in line direction and capable of printing several lines at a time, wherein multi-pass printing and interleaved line feed are employed, and wherein when a unit fails, the image information associated with that unit for each pass of the printhead is printed with at least one other unit of the printhead during at least one of the other passes and wherein two-pass printing is performed.

Abstract: Method of processing photoelectrically scanned image information representing different gray values, before such information is converted, by half-tone processing, into image information representing no more than two gray values, such that the scanned information is distinguished into different categories of information, each category being subjected to a filtering operation determined by the category, the information thus filtered for each category being suitable for subjecting to one type of half-tone processing.