An image processing apparatus includes a block output unit, an arithmetic processing circuit, a data reading circuit, and a block descriptor generation unit. The block output unit outputs a block image based on an input block descriptor. The data reading circuit reads the block image after image processing from the arithmetic processing circuit based on an output block descriptor and outputs the block image after the image processing. The arithmetic processing circuit executes the image processing on block images for one band in accordance with an input band request. The data reading circuit outputs block images for one band in accordance with an output band request. The block descriptor generation unit stores input block descriptors and output block descriptors for at least one band in the predetermined memory in line with timing of the input band request or the output band request.

An optical device includes: a lens body having multiple lenses arranged such that optical axes thereof are parallel to one another; a light-shielding wall that is disposed for the lens body and blocks, in an optical axis direction, portion of light directed to the multiple lenses; and a sheet member that covers a surface of the light-shielding wall, the surface being perpendicular to the optical axes, and allows light to pass therethrough.

An image reading device includes a first scanner, a second scanner, and circuitry. The first scanner is configured to read a first side of a recording medium. The second scanner is configured to read a second side of the recording medium. The circuitry is configured to generate a first correction value to correct misalignment between the first side and the second side. The circuitry is configured to input a second correction value. The circuitry is configured to correct an image based on the first correction value and the second correction value.

An imaging device comprises an imaging sensor and a pulsed LED for illuminating an imaging object of the imaging sensor, performs respective imagings according to respective imaging conditions each including an exposure time te of the imaging sensor and a lighting time tr of the pulsed LED, stores respective combinations of brightness index values D1 of respective images obtained by the respective imagings and the imaging conditions of the respective images, obtains estimates of exposure contribution degree k_off indicating degree of influence of variation of the exposure time te on brightness index value and a lighting contribution degree k_on indicating degree of influence of variation of the lighting time tr on brightness index value, based on the stored combinations of the brightness index values D1 and the imaging conditions, and determines an imaging condition to be used in the next imaging based on the estimates of k_on and k_off.

A predetermined image correction process is automatically performed on an image, and information for identifying that the predetermined image correction process has been performed is displayed in a state that an image having undergone the predetermined image correction process is being displayed.

An image processing apparatus includes a camera, an image reading unit, and a controller. The camera is configured to capture an image of a face of a person. The image reading unit is configured to read a document and to output a document image. The controller is configured to perform control to permit certain processing on the document image if the image of the face captured by the camera matches a face image extracted from the document image.

A document reading apparatus includes a scanner, an input device receiving an input of a width and length, and a processor configured to scan an area specified based on the input length and generate a first image, generate a second image by removing a part of the first image so that a width of the second image is equal to or greater than the input width, detect a background or non-background area in the second image, determine whether the input is appropriate based on whether all sides of an area specified based on the input width and length overlap the background area or none of the sides overlaps the non-background area on the second image, and when the input is appropriate, output a third image in which the background area is removed or the non-background area is extracted from the second image.

An image processing apparatus includes a storage device, an image reading device, a complementary image storage device, and a control device. The complementary image storage device stores a complementary image for complementing an incomplete two-dimensional code. The control device includes a processor and functions, through the processor executing a control program, as a detector, a synthesizer, and an analyzer. The detector detects, from the image obtained through the reading of the image reading device, the incomplete two-dimensional code. The synthesizer synthesizes the incomplete two-dimensional code detected by the detector and the complementary image stored in the complementary image storage device to generate a complete two-dimensional code. The analyzer analyzes the complete two-dimensional code generated by the synthesizer and activates an extension function.

A predetermined image correction process is automatically performed on an image, and information for identifying that the predetermined image correction process has been performed is displayed in a state that an image having undergone the predetermined image correction process is being displayed.

A medium transport device includes a transport section transporting a medium in a contact manner, an electrode detecting static electricity charged on the medium, and a static electricity detection circuit. The static electricity detection circuit includes a voltage clamp circuit clamping a detection signal input from the electrode to a predetermined voltage, an amplifier circuit amplifying an output signal of the voltage clamp circuit, a rectifier circuit rectifying an output signal of the amplifier circuit, and a comparator circuit serving as a determination circuit determining whether the medium exists based on an output signal of the rectifier circuit.