An image processing apparatus includes a reading device and at least one processor. The reading device reads a document into image data of a document image with a first resolution and a second resolution that are different from each other. The first resolution is used for reading the document in a main scanning direction. The second resolution is used for reading the document in a sub-scanning direction perpendicular to the main scanning direction. One or more processors detect an inclination angle of the document image corresponding to inclination of the document, obtain a distortion angle of the document image based on the inclination angle and a ratio between the first resolution and the second resolution, and correct distortion of the document image using the distortion angle.

In a reading device, a light transmissive member has a front surface on which an original is placed. A peripheral member is adjacent to the light transmissive member, and includes a back surface in which a reference hole is formed. The reference hole includes a first edge and a second edge intersecting with each other. A reading sensor faces the back surface of the light transmissive member and the back surface of the peripheral member. The controller controls the reading sensor to read a reading range including the reference hole to obtain a read image, and determines a reference position in the reading range based on the read image. The reference position is determined to an intersection between the first edge and the second edge. The controller sets a reading start position based on the reference position.

An image forming apparatus includes: a platen optically-transparent; a line sensor configured to move below the platen and optically scan the platen; an image-capturing device located below the platen and configured to capture a viewpoint area, the viewpoint area being at least a partial area on the platen and being an area expected to include at least a part of an edge of a document where the document is put on the platen with reference to a reference position on the platen; a display device; and a controller circuitry configured to display a viewpoint image and a guideline image on the display device, the viewpoint image being an image obtained by capturing the viewpoint area by the image-capturing device, the guideline image being an image showing the reference position, such that the guideline image overlaps the reference position in the viewpoint area included in the viewpoint image.

An image reading apparatus includes a for-still-document contact glass serving as a reading face for a placed document, a for-moving-document contact glass serving as a reading face for a document conveyed by an automatic document feeder, and an optical scanner unit to move in a scanning range of the for-still-document contact glass back and forth in a sub-scanning direction to scan the document. The optical scanner unit moves to a scanning range of the for-moving-document contact glass and scans the document in a static manner when the document is conveyed in an automatic manner, and the optical scanner unit includes a contact image sensor, a carriage that holds the contact image sensor in a movable manner in the sub-scanning direction, and a pair of end sliders arranged on both ends of a plane facing the reading face in a longer-side direction of the optical scanner unit.

A reading apparatus comprising a lower case, a reading portion, a drive portion and a stay is used. The reading portion moves between an open position in which the lower case is open and a closed position in which the lower case is closed and accommodates a reading sensor. The drive portion moves the reading sensor in a moving direction. The stay is coupled to the reading portion rotatably in one end and coupled to the lower case rotatably in the other end and moves a rotation shaft with in a direction orthogonal to the shaft. The drive portion is located outside a movable range of the reading sensor. When the reading portion is in the closed position, the stay is disposed in an area in which the stay overlaps the drive portion in the moving direction and overlaps the drive portion in height direction.

An image reading apparatus, including: a guide rail configured to guide an image reading unit; and a fixing portion having configured to fix the guide rail with an adhesive.

In a reading device, a light transmissive member has a front surface on which an original is placed. A peripheral member is adjacent to the light transmissive member, and includes a back surface in which a reference hole is formed. The reference hole includes a first edge and a second edge intersecting with each other. A reading sensor faces the back surface of the light transmissive member and the back surface of the peripheral member. The controller controls the reading sensor to read a reading range including the reference hole to obtain a read image, and determines a reference position in the reading range based on the read image. The reference position is determined to an intersection between the first edge and the second edge. The controller sets a reading start position based on the reference position.

An image reading device comprises a document table having a plate-shaped transparent member for a document to be placed thereon, an image reading unit for reading the document placed on the upper surface of the transparent member from the lower surface side of the transparent member, a carriage for driving the image reading unit to move reciprocally, and a case for containing the carriage. The document table has a frame member along a periphery of the transparent member and is secured to the case by engagement right under the frame member.

An image reading device includes an image reading unit that reads an image while moving in a sub-scanning direction, a casing that houses the image reading unit, a guiding member that is movable relative to the casing in the sub-scanning direction and guides the casing in the sub-scanning direction, and an endless member to which the casing is fixed and that endlessly travels between a starting position and a terminal position in the sub-scanning direction.

An image reading device includes an image reading unit that reads an image while moving in a sub-scanning direction, a casing that houses the image reading unit, a guiding member that is movable relative to the casing in the sub-scanning direction and guides the casing in the sub-scanning direction, and an endless member to which the casing is fixed and that endlessly travels between a starting position and a terminal position in the sub-scanning direction.