Brother Kogyo Kabushiki-kaisha

Shuichi Sunako

Seiya Sato

Tetsuya Kato

Takashi Matsumi

Taiki Yamano

Sayaka Fujiwara

An image scanning device according to aspects of the present disclosures includes a transparent plate member on which an original document can be placed, a line sensor configured to receive a light emitted from a light source and reflected by the original document, and output an electrical signal according to the reflected light, a holding member configured to cover an upper surface of the plate member, and a controller. The controller is configured to obtain a first electrical signal corresponding to a first reflected light when the light source emits light having a first light amount, obtain a second electrical signal corresponding to a second reflected light when the light source emits light having a second light amount, and determine a particular scanning mode for scanning the original document placed on the plate member based on an image difference value calculated from the first and second electrical signals.

Image scanning device

An image scanning apparatus includes a controller configured to acquire image data by scanning a document and a particular range of a document pressing surface, detect black edge positions by detecting, from the image data, black pixels having gradation values less than a white gradation value, determine a sheet type of the document based on the gradation values of the black pixels, detect white edge positions by detecting, from the image data, white pixels having gradation values equal to or more than the white gradation value. The controller is further configured to, when the sheet type is a thin paper, detect, as the white pixels, pixels having gradation values equal to or more than a first threshold, and when the sheet type is a thick paper, detect, as the white pixels, pixels having gradation values equal to or more than a second threshold.

Image scanning apparatus, and method and computer-readable medium therefor

In an image reader, a controller control, during a period from a timing when a detector detects an open state of a cover to a timing when the detector detects a closed state of the cover, a document detector to detect whether a document sheet is present or absent every time a prescribed time period is elapsed, and stores in a memory each set of first data indicating absence or presence of the document sheet. The controller determines a first size of the document sheet in a main scanning direction. The controller determines a second size of the document sheet in a sub scanning direction on the basis of the sets of first data. The controller determines a reading range on the basis of the first and second sizes. The reading section reads the determined reading range on the line-to-line basis to obtain an image of the document sheet.

Image reader having document detector for detecting presence or absence of document sheet to determine reading range

An image scanning apparatus, comprising: a gray reference member; a scanning unit; a signal conversion unit; a controller configured to: calculate white and black difference data of one line by subtracting first black data of one line from white data of one line; calculate a white and black difference maximum value and obtain a particular pixel position corresponding to the white and black difference maximum value; calculate light gray black difference data of one line by subtracting second black data of one line from light gray data of one line; calculate a gray white ratio by dividing the white and black difference maximum value at the particular pixel position by the light gray black difference data at the particular pixel position; and calculate reference data of one line by multiplying light gray data of one line by the gray white ratio.

Growing community of inventors

Ichinomiya, Japan

Shuichi Sunako