An image reading device includes: a scanner having characteristics of causing a distortion of gradation including a sine wave being formed by its obtained image data and being represented as an array of gradation values arranged in a main scanning direction; a reference member to be scanned; a hardware processor that: obtains a gradation value at each main scanning position from shading reference data obtained from the reference member; determines a target range in the shading reference data based on the gradation value at the each main scanning position; generates a substitute part of data to be replaced for an original part of data in the target range; and replaces the original part of data with the substitute part of data while the gradation values at the start and end phase of the substitute part of data are adjusted to the same of the target range.

Apparatus to detect a defect in a printed image and methods of detecting detects in a printed image are described. In some examples, a printing operation is initiated using image data to generate a printed image. The printed image is then scanned to generate a scanned image. A resolution of the scanned image is estimated, calculated or determined on the basis of a characteristic of the printing operation, and a reference image, having a resolution corresponding to the estimated, calculated or determined resolution, is generated from the image data. Whether defects are present in the printed image may be determined on the basis of a comparison of the reference image with the scanned image.

An image reading apparatus according to an embodiment includes an image reading unit that generates reference data by reading a reference surface and generates image data by reading a sheet. A reference plate includes the reference surface for generating the reference data for shading correction of the image reading unit and a background surface for background of a sheet to be read to generate the image data. A control unit controls the positions of the image reading unit and the reference plate to be at a first position relative to each other when the reference data is to be generated and at a second position relative to each other when the image data is to be generated. The second position is different from the first position. A shading correction unit performs the shading correction in the image reading unit based on the generated reference data.

An image inspection apparatus includes: an image forming apparatus that is capable of forming an image of a plurality of colors and includes: an inspector that compares a scanned image obtained by scanning a surface of a sheet on which a job image and a marker image are formed with a reference image, and detects a defect in the scanned image, wherein a color of the marker image is a color having the lowest visibility, and the inspector extracts feature points of the job image and of the marker image from a scanned image of a color corresponding to a complementary color of the color having the lowest visibility included in the scanned image, and determines a position of the scanned image corresponding to the reference image based on the extracted feature points and feature points of the job image and of the marker image in the reference image.

Provided is an image reading apparatus, which is configured to correct a streak image in such a manner as to prevent a correction trace from becoming noticeable even when a streak changes in thickness. The image reading apparatus performs streak image correction for detecting a streak pixel that forms the streak image from image data obtained by reading an original being conveyed. A control unit of the image reading apparatus stores a value of a hysteresis width with a value of a detected streak width being set as an initial value. Each time the streak width is detected, the control unit increments a value of a hysteresis counter when the value of the detected streak width is equal to the value of the hysteresis width, and decrements the value of the hysteresis counter when the value of the detected streak width is different from that of the hysteresis width.

A crease detecting unit 13 detects a crease in a document image. A toner peeling detecting unit (a) detects as a toner peeling part a pixel area on the crease, the pixel area (a1) having a width of the predetermined number of pixels in a direction perpendicular to the crease, (a2) having a background color, and (a3) of which both sides are adjacent to at least two pixels in a direction perpendicular to the crease, the at least two pixels having a color other than the back ground color, and (b) corrects a pixel value of the toner peeling part on the basis of pixel values of at least two pixels adjacent to both sides of the pixel area.

The present disclosure relates to an image processing apparatus, an image processing method, a program, and an endoscope system capable of obtaining an image with high color discrimination. A histogram generation unit generates histograms of pixel values for an input image regarding luminance Y, saturation S, and hue H. A histogram correction unit subtracts components of the saturation, the luminance, and the hue of a portion determined to be a foreign object by a foreign object detection unit from the histograms regarding the saturation, the luminance, and the hue generated by the histogram generation unit and then weights by a value of a standard histogram. The present disclosure may be applied to the endoscope system which performs color conversion on an image input from a camera head through a scope, for example.

Provided are an image reading apparatus and the like for accurately determining the position where an extraneous substance exists. An image reading apparatus comprises: a first unit having an image capture section for capturing a first image and a second image; a second unit having a reference member placed at a position opposed to the image capture section; a conveying mechanism for conveying an original between the first unit and the second unit such that a front end of the original is in contact with one of the first unit and the second unit; an extraneous substance determination unit that determines whether an extraneous substance is included in the first image and the second image; and a position determination unit that, if an extraneous substance is included in the first image, determines whether the position where the extraneous substance exists is on the first unit side or on the second unit side, on the basis of whether the extraneous substance is included in an area of the second image corresponding to an area of the first image in which the extraneous substance is included. The first image is an image obtained by capturing an image of the reference member, while the second image is an image obtained by capturing an image of the reference member after the first image is captured and further the original is conveyed thereafter.

The present invention is related to a scanning device for scanning documents, comprises a flat-bed scanning glass; a contact image sensor arranged above the flat-bed scanning glass separately to form a scanning path therebetween, a bottom surface of the contact image sensor being arranged with a protecting glass, a middle area of the protecting glass being configured as a scanning area, and a chamfer being arranged at the bottom surface of the protecting glass at a downstream position relative to the scanning area. Hence the dust of documents in this invention would be stacked in the chamfer during the scanning process temporarily and then be wiped away by the document itself, so as to assure the dust would not be stacked in the scanning area. The scanning device in this invention is capable to maintain the scanning quality without clearing the dust even after scanned a massive quantity of documents.

The present invention provides an image processing device, an imaging device, an image processing method, and a program which are capable of accurately correcting blurring caused in first image data of an image using a near-infrared ray as a light source and, accurately performing a point image restoration process on second image data of an image using visible light and a near-infrared ray as a light source. An image processing device according to an aspect of the present invention includes an image input unit, a determination unit that determines whether image data is first image data or second image data, a first restoration processing unit that performs a first restoration process using first restoration filters for performing phase correction and amplitude restoration on the determined first image data, and a second restoration processing unit that performs a second restoration process using second restoration filters for performing amplitude restoration without phase correction on the determined second image data.