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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
技術領域
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

In RF2, the CPU 40 extracts the linear edge position LEP. In particular, the CPU 40 may hypothetically arrange the 11 edge positions EP in the objective edge group TEG sequentially in the order along the conveying direction FD from upstream to downstream, and extract the main-scanning position MDP and the edge position EP of the pixel position at a center within the sequentially arranged 11 edge positions EP and the main-scanning position MDP associated with the edge position EP as the linear edge position LEP. Thus, with the linear edge position LEP being based the pixel position of the edge position EP at the center within the objective edge group TEG even when some of the edge positions EP are misjudged due to, for example, imaging noise, the linear edge position LEP may be extracted substantially accurately based on the centricity among the 11 edge positions.

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