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Image reading apparatus

專利號
US10097722B1
公開日期
2018-10-09
申請人
Brother Kogyo Kabushiki Kaisha（JP Nagoya-Shi）
發(fā)明人
Naoyuki Nakamura
IPC分類
H04N1/047; H04N1/00
技術(shù)領(lǐng)域
tmdp,position,pixel,cpu,in,scanning,upstream,edge,downstream,objective
地域： Nagoya

摘要

An image reading apparatus, having a conveyer, a sheet tray, an obtaining device, a memory, a determining device, and a controller, is provided. The controller determines whether information concerning pixels in the memory indicates edge positions or edge absence in in read-image data concerning a sheet, detects an upstream leading-end position and a downstream leading-end position, detects upstream continuing pixels and downstream continuing pixels, detects an upstream lateral-end position and a downstream lateral-end position, calculates a line representing an upper end of the sheet based on the upstream leading-end position and the downstream leading-end position, calculates an upstream corner position and a downstream corner position based on the upstream and downstream lateral-end positions and the line representing the upper end of the sheet, and calculates a width of the sheet based on the upstream corner position and the downstream corner position.

說明書

FIG. 8 is a flowchart to illustrate a most upstream leading-end position detecting process RB1 to detect a most upstream leading-end position UHP in the image reading apparatus 1 according to the embodiment of the present disclosure.

FIG. 9 is a flowchart to illustrate a most upstream lateral-end position detecting process RB3 to detect a most upstream lateral-end position USP in the image reading apparatus 1 according to the embodiment of the present disclosure.

FIG. 10 is a flowchart to illustrate a downstream positions detecting process RA3 to be executed in the image reading apparatus 1 according to the embodiment of the present disclosure.

FIG. 11 is a flowchart to illustrate a leading-end line calculating process RA4 to calculate a leading-end line HEL in the image reading apparatus 1 according to the embodiment of the present disclosure.

FIG. 12A is a table to illustrate data arrangement in the RAM 42 storing main-scanning positions MDP and edge data ED in the image reading apparatus 1 according to the embodiment of the present disclosure. FIG. 12B illustrates the main-scanning positions MDP and edge positions in an original sheet GS to be read in the image reading apparatus 1 according to the embodiment of the present disclosure.

FIG. 13 is a flowchart to illustrate a most downstream leading-end position detecting process RE1 to detect a most downstream leading-end position DHP in the image reading apparatus 1 according to the embodiment of the present disclosure.

權(quán)利要求

1
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