| 摘要 |
In an image processing apparatus, digital video data is converted into analog video data by a D/A converter. A reference pattern timing-adjusted is generated. The phase relationship between the reference pattern and the analog video data is optimized. The analog video data and the reference pattern are compared by comparing unit. A pulse-width modulated signal output from the comparing unit is detected. The variable output regulator is controlled according to a preset reference value, a quantity of laser light of the output device, or a surface potential of the photoreceptor. Through the control of the regulator, the quantity of bias applied to the reference pattern is optimized at all times, providing a pulse-width modulated image signal with an excellent tone reproduction at all times.
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