Discrimination of an edge portion of an image from a screen dot portion in an image processing system
AssigneeCanon Kabushiki Kaisha
InventorNaoto Kawamura
Life of this patent
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Abstract
There is provided an image processing apparatus comprising an image signal generator having a first processing unit for processing the image signal in a first mode and generating a first processed signal, a discriminator for discriminating characteristics of the image signal, the discriminator having a selector for selecting the first processed signal according to a discrimination result; and a pulse width modulated signal generator for processing the first processed signal from the selector by using a pattern signal and for generating a pulse width modulated signal.
Claims12
An image processing apparatus, comprising:
- a) image signal generating means for generating a digital image signal having multi-bits for each pixel;
- b) discrimination means for discriminating an edge portion of the digital image signals using a plurality of pixels;
- c) emphasizing means for emphasizing the digital image signal of the edge portion discriminated by said discriminating means to generate an output signal;
- and
- d) pulse-width-modulated signal generating means for modulating the output signal.
Am image processing apparatus comprising:
- a) image signal generating means for generating a digital image signal having multi-bits for each pixel;
- b) discriminating means for discriminating an edge portion of the digital image signal using a plurality of pixels;
- c) smoothing means for smoothing the digital image signal of a non-edge portion discriminated by said discriminating means to generate an output signal;
- and
- d) pulse-width-modulated signal generating means for modulating the output signal to generate a pulse-width-modulated signal.
An image processing method, comprising the steps of:
- a) generating a digital image signal having multi-bits for each pixel;
- b) discriminating an edge portion of the digital image signals using a plurality of pixels;
- c) emphasizing the digital image signal of the edge portion discriminated in said discriminating step to generate an output signal;
- and
- d) pulse-width-modulating the output signal.
An image processing method comprising the steps of:
- a) generating a digital image signal having multi-bits for each pixel;
- b) discriminating an edge portion of the digital image signal using a plurality of pixels;
- c) smoothing the digital image signal of a non-edge portion discriminated in said discriminating step to generate an output signal;
- and
- d) pulse-width modulating the output signal to generate a pulse-width-modulated signal.
Dependencies are inferred from the claim text.