摘要:
According to one embodiment, a document detecting apparatus includes a light-emitting element, a photoelectric conversion element, a light-emission controller and a detection processor. The light-emitting element projects light onto a detection position of a document. The photoelectric conversion element outputs an electric signal obtained by converting the light from the detection position of the document. The light-emission controller changes the light quantity of the light emitted by the light-emitting element. The detection processor detects the presence or absence of the document at the detection position of the document based on the presence or absence of a change of an output value corresponding to the change of the light quantity caused by the light-emission controller in an output value from the photoelectric conversion element.
摘要:
A first LED that is one of a plurality of LEDs arranged in the main scanning direction is turned on, and the presence of a document on a document table glass is determined by detection of reflected light from the document using a CCD sensor, and a second LED other than the first LED in addition to the first LED among the plurality of LEDs is turned on when it is determined that a document is placed on the document table glass, and the size of the document on the document table glass is determined based on a scanning result of the CCD sensor on the reflected light from the document caused by illumination from the first and the second LEDs and a detection result of a reflective photosensor.
摘要:
According to an embodiment, an image reading apparatus includes: a light emitting body configured to emit light at illuminance lower than illuminance in reading an original document; a sensor configured to detect opening and closing of a cover; an image pickup element configured to pick up an image of the original document, on which the light from the light emitting body is irradiated, if the cover is open; and a control and determining section configured to turn on the light emitting body if the cover is opened and specify a pixel having a value exceeding a threshold from the picked-up image to determine the size of the original document.