147results about How to "Improve scan quality" patented technology

An image reading device and an image forming apparatus having the same that can increase a scan quality by improving mounting positions of units to read information recorded on a document and a mounting structure of a light shielding member. The image reading device may include a first reading unit to read image information recorded on a first surface of a document, a second reading unit disposed at a predetermined distance from the first reading unit along a document feeding direction to read image information recorded on a second surface of the document, and at least one light shielding member mounted between the first reading unit and the second reading unit along the document feeding direction. The light shielding member may extend in a direction different from the document feeding direction such that one end portion is located in a document feeding path. The light shielding member may be provided with a document guide portion to guide the document.

A method of auto-deskewing a titled original image is provided. Frist, obtain an original image by scanning to acquire values of pixels in the orignal image. Next subject the original image to a binarization process. And, set a datum line in the original image. Then determine a tilting angle on the basis of the datum line. Finally, adjust the original image on the basis of the tilting angle. Therefore, the tilting angle of the original image may be acquired to adjust.

An image reading device and an image forming apparatus having the same that can increase a scan quality by improving mounting positions of units to read information recorded on a document and a mounting structure of a light shielding member. The image reading device may include a first reading unit to read image information recorded on a first surface of a document, a second reading unit disposed at a predetermined distance from the first reading unit along a document feeding direction to read image information recorded on a second surface of the document, and at least one light shielding member mounted between the first reading unit and the second reading unit along the document feeding direction. The light shielding member may extend in a direction different from the document feeding direction such that one end portion is located in a document feeding path. The light shielding member may be provided with a document guide portion to guide the document.

A method of calibrating image luminance values is provided. At first, a calibration chart is scanned, and a dark actual luminance value and a white actual luminance value are obtained accordingly. Next, a document is scanned, and a scan luminance value is obtained accordingly. Then, a white ideal luminance value, a dark ideal luminance value, an ideal luminance value and a predetermined calibrated luminance value are provided. Next, a calibrated luminance value is determined according to the dark actual luminance value, the white actual luminance value, the white ideal luminance value, the dark ideal luminance value, the ideal luminance value, the predetermined calibrated luminance value and the scan luminance value.

A scanning device including a base, a guiding module and a scanning head is provided. The guiding module includes a guiding rod, a guiding element, a sliding element and an elastic element. The guiding rod is fixed to the base. The guiding element has a notch, wherein the guiding rod is slidingly disposed at the notch along a first axial direction. The sliding element is slidingly disposed at the guiding element along a second axial direction substantially perpendicular to the first axial direction. The elastic element is fixed to the guiding element and contacts with the sliding element, wherein the sliding element pushes the guiding rod to contact an inner wall of the notch along the second axial direction by an elastic force of the elastic element, so as to prevent the guiding rod from swaying during a scanning process.

A paper feeding module including a first shaft, a first ring-shape structure, a paper picking roller and a paper feeding roller is provided. The first shaft has a first stopping block. The first ring-shape structure rotatably covers the first shaft and has a second stopping block and a third stopping block, wherein the first shaft drives the first ring-shape structure to rotate while the second stopping block is pushed by the first stopping block. The paper picking roller rotatably covers the first shaft and is located on the paper feeding path, and has a fourth stopping block, wherein the first ring-shape structure drives the paper picking roller to rotate while the fourth stopping block is pushed by the third stopping block. The paper feeding roller is disposed on the paper feeding path.

A method of acquiring image data with an MRI system from an object using a sequence of tip-down and tip-up RF pulses is described. A slice-selective first pulse α rotates the in-slice spins from the longitudinal axis (z) toward a transverse plane (x, y). Image data is acquired from the in-slice spins during a free precession interval (Tfree) in which the in-slice spins precess along the transverse plane (x, y). A spatially tailored, non-slice-selective second pulse β({right arrow over (r)}) is applied for rotating the in-slice spins from the transverse plane (x, y) to at least substantially along the longitudinal axis (z). A third pulse S may be applied to the in-slice and out-of-slice spins to eliminate (spoil) residual transverse signal from out-of-slice spins.

The invention provides a homing method for a scanning device and a scanning module thereof. A positioning plate of the scanning device is arranged on the inner wall of a shell; the scanning module indentifies at least one X axis side image corresponding to the positioning plate and determines a starting line for scanning according to the X axis side image. The homing method identifies at least one X axis side image corresponding to the positioning plate by capturing images between the positioning plate and the inner wall of the shell of the scanning device and determines the starting line of scanning according to the X axis side image and captures the image of a document to be scanned by moving along a Y axis direction from the starting line for scanning. The scanning module of the invention can accurately carry out homing and positioning, thus completely capturing the image of the document to be scanned and correspondingly improving the quality of the scanning. Meanwhile, a monochromic positioning plate can be adopted and the positioning plate does not need to set patterns in a manner of printing, therefore the cost and complexity of the production are lower than those of the traditional positioning structure, which is also beneficial for improving the facilitation and precision of the identification of the scanning module.