An image reader including a document table having a reference point, a first region of a sheet having a predetermined size when a vertex of the sheet is positioned on the reference point, and a second region, a changing mechanism changing a reading position in a sub scanning direction, and a controller configured to control the changing mechanism to change the reading position to a first position such that a distance in the sub scanning direction between the reference point and the first position corresponds to a length of the predetermined sheet size in the sub scanning direction, acquire specific digital data of the second region through image reading in the first position with a light source turned off, compare a particular value of the specific digital data with a criterion value within the second region, and determine a state of a document cover based on the comparison.

A scanning device includes a transparent platen which receives a sheet to be scanned. A backing assembly is spaced from the platen by the sheet during scanning. The backing assembly includes a backing plate of a fixed color and an electrochromic layer intermediate the backing plate and the platen. The electrochromic layer has a first state in which the electrochromic layer is opaque and has a different color from the fixed color, and a second state, in which the electrochromic layer is transparent to expose the backing plate through it. A sensor is positioned to acquire an image of the sheet based on light passing through the platen. A controller selectively applies a voltage across the electrochromic layer to change the electrochromic layer between the first and second states.

When heights from the reading lines (Lr, Lg, Lb) on the transmission part (13B) corresponding to the line sensors (33r, 33g, 33b) to the predetermined conveyance path T are employed as reading heights of the line sensors (33r, 33g, 33b), a position shift correction unit (100) performs first correction control for correcting position shifts between image signals outputted from the line sensors (33r, 33g, 33b) on the basis of a difference of the reading heights between the line sensors (33r, 33g, 33b).

There is provided a document forgery detection system adapted to have an advanced level of document verification and scanning structure against forgery, whereby the documents gets verified by various verification methods. The forgery detection system comprises a scanning device adapted to scan the document for verification and to compare the scanned image to an original image of the document stored in a remote server associated to a relevant authority. The forgery detection system comprises a verification device adapted to receive and secure the document in place in an angle adjustable configuration, project visible and ultraviolet light on the document for exposing visible light and ultraviolet light exposable embedded marks within the document and reflect these marks to a display in optical communication with the operator. The verification device comprising a magnifier with a visible light lens and a red lens for enabling visualization of embedded marks within the document.

A reading apparatus includes a reader that obtains image data by reading a reading target, a platen on which a document to be read by the reader located at a first position is set, a first member read by the reader located at the first position if there is no document on the platen, a second member read by the reader located at a second position, which is different from the first position, and a determination unit that performs a determination process for determining whether the document is set on the platen on the basis of a first output, which is obtained if the reader located at the first position reads the reading target, and a second output, which is obtained if the reader located at the second position reads the reading target.

There is provided a document forgery detection system adapted to have an advanced level of document verification and scanning structure against forgery, whereby the documents gets verified by various verification methods. The forgery detection system comprises a scanning device adapted to scan the document for verification and to compare the scanned image to an original image of the document stored in a remote server associated to a relevant authority. The forgery detection system comprises a verification device adapted to receive and secure the document in place in an angle adjustable configuration, project visible and ultraviolet light on the document for exposing visible light and ultraviolet light exposable embedded marks within the document and reflect these marks to a display in optical communication with the operator. The verification device comprising a magnifier with a visible light lens and a red lens for enabling visualization of embedded marks within the document.

A platen cushion apparatus includes a platen cushion configured to conform to both a document and a platen of a scanner so as to maintain the document against the platen independent of a scanner to document handler alignment, while also maximizing contact with the document and spread an even down-force across an entire surface of the document and improve the contact of the document against the platen.

The disclosure provides a scanning device including a flatbed scanner and an ADF. The flatbed scanner includes a first body, a transparent substrate disposed on top surface of the first body, a first film disposed on top surface of the transparent substrate, and an image capturing module disposed under bottom surface of the transparent substrate. The ADF includes a second body, a backplane disposed at bottom of the second body for covering top surface of the flatbed scanner, a paper passage disposed inside the ADF, and a second film. An open portion is configured in the paper passage corresponding to top surface of the transparent substrate, and results communication between the paper passage and top surface of the transparent substrate. The second film is disposed at paper entrance of the open portion. Wherein, the first film and the second film are not overlap on top surface of the transparent substrate.

First reference data acquired by reading a first white reference member placed in a read area of a document platen by a line sensor having a plurality of light receiving elements is stored in a storage unit. Second reference data acquired by reading a second white reference member by a capturing unit is compared with the first reference data stored in the storage unit. Output values from the plurality of light receiving elements are subjected to shading correction based on the comparison result.

An image reading optical system includes an image reading unit including plural reading elements that are arranged in a first direction, a first reflective optical system configured to reflect reflection light which is irradiation light emitted from a light source and reflected on an object to be read, a second reflective optical system configured to condense the reflection light reflected on the first reflective optical system to the image reading unit, and an aperture stop including a plate shaped member formed with an aperture configured to regulate the reflection light reflected on the first reflective optical system in the first direction, the plate shaped member including at least one plate shaped piece bent at a preset angle with respect to the aperture along a tangent line of the aperture in the first direction.