A processing apparatus includes a detector, an acceptance unit, and a manager. The detector detects a user. The acceptance unit accepts an operation performed by the user for selecting a process. The manager manages plural resources of the processing apparatus so as to reserve, upon detection of the user by the detector, the plural resources and to release, upon acceptance of the operation by the acceptance unit, a resource among the plural resources that is not necessary for the process selected in the operation.

A processing apparatus includes a detector, an acceptance unit, and a manager. The detector detects a user. The acceptance unit accepts an operation performed by the user for selecting a process. The manager manages plural resources of the processing apparatus so as to reserve, upon detection of the user by the detector, the plural resources and to release, upon acceptance of the operation by the acceptance unit, a resource among the plural resources that is not necessary for the process selected in the operation.

A portable security device may enable a security guard to quietly and unobtrusively solicit assistance, or transmit information, when desired. A portable security device may include a user interface, a LiFi source and a controller that is operatively coupled to the user interface and to the LiFi source. In some cases, the controller may be configured to present two or more alert options to the security guard via the user interface and to receive a selection of one of the alert options by the security guard. In response to the selection of an alert option by the security guard, the controller may be configured to transmit a LiFi message that corresponds to the selected alert option via the LiFi source.

A portable security device may enable a security guard to quietly and unobtrusively solicit assistance, or transmit information, when desired. A portable security device may include a user interface, a LiFi source and a controller that is operatively coupled to the user interface and to the LiFi source. In some cases, the controller may be configured to present two or more alert options to the security guard via the user interface and to receive a selection of one of the alert options by the security guard. In response to the selection of an alert option by the security guard, the controller may be configured to transmit a LiFi message that corresponds to the selected alert option via the LiFi source.

A portable security device may enable a security guard to quietly and unobtrusively solicit assistance, or transmit information, when desired. A portable security device may include a user interface, a LiFi source and a controller that is operatively coupled to the user interface and to the LiFi source. In some cases, the controller may be configured to present two or more alert options to the security guard via the user interface and to receive a selection of one of the alert options by the security guard. In response to the selection of an alert option by the security guard, the controller may be configured to transmit a LiFi message that corresponds to the selected alert option via the LiFi source.

In an image reading apparatus, in a case where the processor determines that the original image to be obtained represents a book document, the processor determines whether a value satisfies a prescribed condition. The value is based on a difference between a first density distribution of an image in a first partial region of the entire image and a second density distribution of an image in a second partial region of the entire image. The first partial region includes a part of a dark region. The dark region extends in an extending direction. The first partial region extends in a crossing direction crossing the extending direction. The second partial region includes another part of the dark region and extends in the crossing direction. In a case where the value satisfies the prescribed condition, the processor controls the reading device to interrupt reading the entire image.

An electronic device includes an amplifier, a signal conversion unit configured to include at least one photodiode, in response to an optical signal being received from an external device, convert the received optical signal into an electric signal by using the at least one photodiode and output the electric signal, and a processor configured to control to supply power to the amplifier in response to the electric signal being received from the signal conversion unit, wherein the amplifier, in response to the power being supplied, receives the electric signal from the signal conversion unit, amplifies the received electric signal and outputs the amplified electric signal to the processor.

A portable security device may enable a security guard to quietly and unobtrusively solicit assistance, or transmit information, when desired. A portable security device may include a user interface, a LiFi source and a controller that is operatively coupled to the user interface and to the LiFi source. In some cases, the controller may be configured to present two or more alert options to the security guard via the user interface and to receive a selection of one of the alert options by the security guard. In response to the selection of an alert option by the security guard, the controller may be configured to transmit a LiFi message that corresponds to the selected alert option via the LiFi source.

An image reading device includes a main body including a light transmissive plate on a top surface of the main body, a document placing plate on the top surface of the main body adjacent to the light transmissive plate in a first direction to place a document, and an image reader movable under the light transmissive plate and the document placing plate in the first direction to read image on the document, and a document conveyor including a document setting unit to set the document, a document conveyor movable between an open position and a closed position, and an image pattern portion at a bottom surface of the document conveyor, the image pattern portion having an image pattern to be read by the image reader at a position under the light transmissive plate.

An image reading device includes: a visible light source to emit visible light to an object; an invisible light source to emit invisible light to the object; a first imaging element to receive light reflected from the object to capture a visible image; a second imaging element to receive light reflected from the object to capture an invisible image; and circuitry to remove a visible component included in the invisible image captured by the second imaging element using the visible image captured by the first imaging element.