Image processing apparatus adaptable for use at variable resolution
AssigneeCanon Kabushiki Kaisha
InventorIkuo Sobue
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Abstract
An image processing apparatus suitable for use in a laser beam printer includes an input circuit for inputting image data, and a processing circuit for processing the image data input via the input circuit. The processing circuit includes a converter for converting resolution of the image data, and for outputting converted image data. The processing circuit further includes a pulse-width-modulated signal generating circuit for generating a pulse-width-modulated signal in accordance with a pattern of the image data.
Claims8
An image processing apparatus comprising:
- input means for inputting data image processed by an error diffusion method;
- recording dot size control signal generating means for generating a recording dot size control signal in accordance with a pattern of the image data;
- and
- resolution converting means for recording plural lines of the image data for each line of the image data input by said input means on the basis of the recording dot size control signal, and for converting the image data to be recorded to data of a higher pixel resolution than a pixel resolution of the input image data.
An image processing apparatus comprising:
- input means for inputting image data;
- discrimination means for discriminating continuity of an object image datum with neighboring image data;
- a recording dot size control signal generating means for generating a recording dot size control signal in accordance with a discrimination result obtained by said discrimination means;
- and
- resolution converting means for recording plural lines of the image data for each line of the image data input by said input means on the basis of the recording dot size control signal, and for converting the image data to be recorded to data of a higher pixel resolution than a pixel resolution of the input image data.
An image processing apparatus comprising;
- input means for inputting binary data;
- pulse width modulated signal generating means for generating a pulse width modulated signal which indicates the recording width of objective pixels, on the basis of binary data representing the objective pixels and neighboring pixels of the object pixels input by the said input means, wherein the width of the pulse width modulated signal is narrower than the recording width of one pixel;
- and
- resolution converting means for recording plural lines of the binary data for each line of the binary data input by said input means on the basis of the pulse width modulated signal generated by said pulse width modulated signal generating means and for converting the resolution of the input image.
Dependencies are inferred from the claim text.