Image reading apparatus and method and storage medium
AssigneeCanon Kabushiki Kaisha
InventorsKiyoshi Kaneko, Tadashi Yamamoto, Akihiko Nakatani
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Abstract
The invention provides an image reading apparatus for performing high-precision image read by canceling out noise based on digital signal processing and superimposed on an effective portion of an analog signal. The image reading apparatus superimposes digital-based data and data-clock-based fixed noise on an sensor output signal in reference data acquiring operation as well to output data with the fixed data being canceled out in image read-operation.
Claims16
An image reading apparatus comprising:
- an image reading unit adapted to read image data;
- a serial output unit adapted to output the image data read by said image reading unit in a serial form;
- and
- a plurality of parallel output units adapted to output the image data read by said image reading unit in a plurality of types of parallel forms.
An image reading apparatus comprising:
- an image reading unit adapted to read an image;
- an output clock generating unit adapted to generate an output clock signal for outputting image data from said image reading unit;
- and
- a dummy clock generating unit adapted to generate a dummy clock similar to the output clock signal when said image reading unit reads a reference image.
An image reading method comprising the steps of:
- reading image data;
- and
- selecting one of output unit in a serial form and output units in a plurality of types of parallel forms to output the image data read in the image data reading step.
An image reading method comprising the steps of:
- reading an image;
- generating an output clock signal for outputting image data read in the image reading step;
- and
- generating a dummy clock similar to the output clock signal when a reference image is read in the image reading step.
A storage medium storing a control program for controlling an image reading apparatus, wherein
- the control program comprises:
- a code for a step of reading image data;
- and
- a code for a step of selecting one of output unit in a serial form and output units in a plurality of types of parallel forms to output the image data read in the image data reading step.
A storage medium storing a control program for controlling an image reading apparatus wherein
- the control program comprises:
- a code for a step of reading an image;
- a code for a step of generating an output clock signal for outputting image data read in the image reading step;
- and
- a code for a step of generating a dummy clock similar to the output clock signal when a reference image is read in the image reading step.
Dependencies are inferred from the claim text.