JP2019004314A5

JP2019004314A5 -

Info

Publication number: JP2019004314A5
Application number: JP2017117483A
Authority: JP
Filing date: 2017-06-15
Publication date: 2020-07-27
Anticipated expiration: 2037-06-15

Description

そこで、本発明は、画像読取装置の生産性の低下を抑制しつつ、画像データの傾き補正の精度の低下を抑制することを目的とする。
Therefore, an object of the present invention is to suppress a decrease in the accuracy of image data inclination correction while suppressing a decrease in the productivity of the image reading apparatus.

前記課題を解決するため、本発明の一実施例による画像読取装置は、
原稿を搬送する原稿搬送手段と、
前記原稿搬送手段により搬送される前記原稿の第一の面の画像を読み取る第一の画像読取手段と、
前記原稿が搬送される搬送方向において前記第一の画像読取手段の下流に配置され、前記原稿搬送手段により搬送される前記原稿の前記第一の面と反対の第二の面の画像を読み取る第二の画像読取手段と、
前記搬送方向において前記第一の画像読取手段の上流に配置され、前記原稿搬送手段により搬送される前記原稿を検出する第一の原稿検出手段と、
前記搬送方向において前記第一の画像読取手段の上流且つ前記搬送方向に垂直な幅方向において前記第一の原稿検出手段とは異なる位置に配置され、前記原稿搬送手段により搬送される前記原稿を検出する第二の原稿検出手段と、
前記第一の原稿検出手段が前記原稿を検出したタイミングと前記第二の原稿検出手段が前記原稿を検出したタイミングとに基づいて前記原稿の第一傾き量を検出する第一の傾き量検出手段と、
前記第一の画像読取手段により読み取られた前記第一の面の画像を表す画像データに基づいて前記原稿の第二傾き量を検出する第二の傾き量検出手段と、
前記第二の画像読取手段により読み取られた前記第二の面の画像を表す画像データに基づいて前記原稿の第三傾き量を検出する第三の傾き量検出手段と、
前記第一傾き量と前記第二傾き量との差が第一の所定の範囲内の値である場合は、前記第一の面の前記画像データの傾きを補正するための第一の傾き補正量及び前記第二の面の前記画像データの傾きを補正するための第二の傾き補正量を前記第二傾き量に基づいて決定し、前記第一傾き量と前記第二傾き量との差が前記第一の所定の範囲外の値である場合は、前記第一の傾き補正量及び前記第二の傾き補正量を前記第一傾き量と前記第三傾き量とに基づいて決定する傾き補正量決定手段と、
前記傾き補正量決定手段によって決定された補正量に基づいて、前記第一の面の前記画像データの傾き及び前記第二の面の前記画像データの傾きを補正する補正手段と、
を備えることを特徴とする。
In order to solve the above problems, an image reading apparatus according to an embodiment of the present invention is
A document conveying means for conveying a document,
A first image reading unit that reads an image on the first surface of the document conveyed by the document conveying unit;
A first image reading unit, which is arranged downstream of the first image reading unit in the conveyance direction in which the document is conveyed, and which reads an image on a second surface of the document that is conveyed by the document conveyance unit and is opposite to the first surface; Second image reading means,
A first document detecting unit arranged upstream of the first image reading unit in the carrying direction, for detecting the document carried by the document carrying unit;
The document is arranged upstream of the first image reading unit in the transport direction and in a width direction perpendicular to the transport direction at a position different from that of the first document detection unit, and detects the document transported by the document transport unit. Second document detecting means for
First tilt amount detecting means for detecting a first tilt amount of the document based on a timing at which the first document detecting means detects the document and a timing at which the second document detecting means detects the document. When,
Second tilt amount detecting means for detecting a second tilt amount of the document based on image data representing the image of the first surface read by the first image reading means;
Third tilt amount detecting means for detecting a third tilt amount of the document based on image data representing the image of the second surface read by the second image reading means,
When the difference between the first tilt amount and the second tilt amount is a value within a first predetermined range, a first tilt correction for correcting the tilt of the image data of the first surface. Amount and a second tilt correction amount for correcting the tilt of the image data of the second surface are determined based on the second tilt amount, and a difference between the first tilt amount and the second tilt amount. Is a value outside the first predetermined range, a slope that determines the first tilt correction amount and the second tilt correction amount based on the first tilt amount and the third tilt amount. Correction amount determining means,
Correction means for correcting the inclination of the image data of the first surface and the inclination of the image data of the second surface based on the correction amount determined by the inclination correction amount determining means;
It is characterized by including.

本発明によれば、画像読取装置の生産性の低下を抑制しつつ、画像データの傾き補正の精度の低下を抑制することができる。

According to the present invention, it is possible to suppress a decrease in the accuracy of image data inclination correction while suppressing a decrease in the productivity of the image reading apparatus.

Claims

A document conveying means for conveying a document,
A first image reading unit that reads an image on the first surface of the document conveyed by the document conveying unit;
A first image reading unit, which is arranged downstream of the first image reading unit in the conveyance direction in which the document is conveyed, and which reads an image on a second surface of the document that is conveyed by the document conveyance unit and is opposite to the first surface; Second image reading means,
A first document detecting unit arranged upstream of the first image reading unit in the carrying direction, for detecting the document carried by the document carrying unit;
The document is arranged upstream of the first image reading unit in the transport direction and in a width direction perpendicular to the transport direction at a position different from that of the first document detection unit, and detects the document transported by the document transport unit. Second document detecting means for
First tilt amount detecting means for detecting a first tilt amount of the document based on a timing at which the first document detecting means detects the document and a timing at which the second document detecting means detects the document. When,
Second tilt amount detecting means for detecting a second tilt amount of the document based on image data representing the image of the first surface read by the first image reading means;
Third tilt amount detecting means for detecting a third tilt amount of the document based on image data representing the image of the second surface read by the second image reading means,
When the difference between the first tilt amount and the second tilt amount is a value within a first predetermined range, a first tilt correction for correcting the tilt of the image data of the first surface. Amount and a second tilt correction amount for correcting the tilt of the image data of the second surface are determined based on the second tilt amount, and a difference between the first tilt amount and the second tilt amount. Is a value outside the first predetermined range, a slope that determines the first tilt correction amount and the second tilt correction amount based on the first tilt amount and the third tilt amount. Correction amount determining means,
Correction means for correcting the inclination of the image data of the first surface and the inclination of the image data of the second surface based on the correction amount determined by the inclination correction amount determining means;
An image reading apparatus comprising:

If the difference between the first tilt amount and the second tilt amount is a value within the first predetermined range, the tilt correction amount determination means, before the third tilt amount is detected, The image reading apparatus according to claim 1, wherein processing for determining the first tilt correction amount and the second tilt correction amount based on the second tilt amount is started.

The tilt correction amount determination means is configured such that the difference between the first tilt amount and the second tilt amount is a value outside the first predetermined range, and the first tilt amount and the third tilt amount. And a difference within a second predetermined range, the first tilt correction amount and the second tilt correction amount are determined based on the third tilt amount, and the first tilt amount is determined. And the difference between the second inclination amount is a value outside the first predetermined range, and the difference between the first inclination amount and the third inclination amount is outside the second predetermined range. If the value is a value, the first tilt correction amount and the second tilt correction amount are determined based on the first tilt amount, and the image reading apparatus according to claim 1 or 2.

The first tilt amount detecting means detects the original document by the first original document detecting means, detects the original document by the second original document detecting means, and detects the first original document in the width direction. 4. The first tilt amount is detected based on a distance between a document and the second document detection unit and a document conveyance speed. Image reader.

The second tilt amount detecting means detects the second tilt amount based on an edge of the document detected based on the image data of the first surface,
5. The third tilt amount detecting means detects the third tilt amount based on an edge of the document detected based on the image data of the second surface. The image reading device described in any one of 1.