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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

In RH9, if the CPU 40 determines that the lateral-end determination flag SDFG is off (RH9: NO), in RH10, the CPU 40 saves the most downstream leading-end position DHP as the most downstream lateral-end position DSP in the RAM 42. If the CPU 40 determines that the lateral-end determination flag SDFG is on (RH9: YES), or following RH11, the CPU 40 ends the most downstream lateral-end position detecting process RE3. The most downstream lateral-end position detecting process RE3 ends at the end of RH11. At the end of RE3, ends the downstream positions detecting process RA3. The flow returns to the calculating process R3 to obtain the upstream corner position UHVP and the downstream corner position DHVP (see FIG. 6).

[Leading-End Line Calculating Process RA4]

權(quán)利要求

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