Print apparatus which performs screen processing based on input gradation data

摘要

A print apparatus includes an edge detector using attribute information, a screen processor which binarizes each pixel included in image data with a screen processing, a pulse width converter which converts each pixel included in the image data to pulse width data in accordance with an input gradation value, and an output unit which outputs pulse width data from either of the screen processor or the pulse width converter for each pixel. The output unit outputs the pulse width data from the pulse width converter for an edge pixel and outputs the pulse width data from the screen processor for a non-edge pixel.

主权项

1. A print apparatus which prints image data having an input gradation value and attribute information for each pixel, comprising:
an edge detector which detects an edge pixel using the attribute information; a screen processor which binarizes each pixel included in the image data with a screen processing; a pulse width converter which converts each pixel included in the image data to pulse width data in accordance with the input gradation value; an output unit which outputs either of pulse width data based on data binarized by the screen processor or pulse width data which is not binarized by the screen processor and is converted by the pulse width converter for each pixel; and a print execution unit which outputs a pulse signal corresponding to the pulse width data output from the output unit to execute printing, wherein the output unit outputs the pulse width data which is not binarized by the screen processor and is converted by the pulse width converter for a pixel detected as an edge pixel by the edge detector, the output unit outputs the pulse width data based on the data binarized by the screen processor for a pixel detected as a non-edge pixel by the edge detector, the print execution unit outputs a pulse signal such that a print region is at a left end position in a target pixel when pulse width data for a pixel adjacent to the target pixel in the left direction is larger than pulse width data for a pixel adjacent to the target pixel in the right direction, the print execution unit outputs a pulse signal such that a print region is at a right end position in a target pixel when pulse width data for a pixel adjacent to the target pixel in the right direction is larger than pulse width data for a pixel adjacent to the target pixel in the left direction, and the print execution unit outputs a pulse signal such that a print region is at a center position in a target pixel when pulse width data for a pixel adjacent to the target pixel in the left direction is equal to pulse width data for a pixel adjacent to the target pixel in the right direction.