JP2010113070A5

JP2010113070A5 - Image forming apparatus

Info

Publication number: JP2010113070A5
Application number: JP2008284257A
Authority: JP
Filing date: 2008-11-05
Publication date: 2011-12-22
Anticipated expiration: 2028-11-05

Description

本発明は、電子写真方式により画像形成を行う画像形成装置に関する。 The present invention relates to an image forming equipment for forming an image by an electrophotographic method.

本発明の目的は、コピー画像、プリント画像、画像データの線幅の忠実再現性を向上させることを可能とした画像形成装置を提供することにある。 An object of the present invention is to provide a possibility as an image forming equipment to improve copy image, print image, a faithful reproduction of a line width of the image data.

上記目的を達成するために、本発明は、画像を読み取る画像読取手段と、前記画像読取手段によって読み取られた画像に対応する画像データに基づいて記録材に画像を形成する画像形成手段とを備える画像形成装置において、パターン画像を前記画像読取手段により読み取って得た第１の画像データと、前記第１の画像データに基づいて前記画像形成手段により記録材に形成したコピー画像を前記画像読取手段により読み取って得た第２の画像データとを比較する比較手段と、原稿の画像の線幅と前記原稿の画像の画像データに基づいて前記画像形成手段が形成するコピー画像の線幅とが等しくなるように、前記比較手段による前記第１の画像データと前記第２の画像データとの比較結果に基づいて前記原稿の画像の画像データを補正する補正手段と、を備えることを特徴とする。 To achieve the above object, the present invention includes an image reading unit that reads an image, and an image forming unit that forms an image on a recording material based on image data corresponding to the image read by the image reading unit. In the image forming apparatus, first image data obtained by reading a pattern image by the image reading unit, and a copy image formed on a recording material by the image forming unit based on the first image data , the image reading unit. by comparing means for comparing the second image data obtained by reading, and the line width of a copy image by the image forming means is formed on the basis of the image data of the image of the document and the line width of the image of the originals is to be equal, the complement to correct the image data of said original image based on a result of comparison between the first image data and the second image data by said comparing means Characterized in that it comprises a means.

また、本発明は、画像を読み取る画像読取手段と、前記画像読取手段によって読み取られた画像に対応する画像データに基づいて記録材に画像を形成する画像形成手段とを備える画像形成装置において、パターン画像を前記画像読取手段により読み取って得た第１の画像データと、前記第１の画像データに基づいて前記画像形成手段により記録材に形成したコピー画像を前記画像読取手段により読み取って得た第２の画像データと、前記画像形成装置に記憶されている補正データに基づいて前記画像形成手段により記録材に形成して得たプリント画像を前記画像読取手段により読み取って得た第３の画像データとを比較する比較手段と、前記比較手段の比較により、前記第１の画像データと前記第２の画像データとの差分に基づく第１の補正値と、前記第１の画像データと前記第３の画像データとの差分に基づく第２の補正値と、前記第１の補正値と前記第２の補正値との差分に基づく第３の補正値を算出する算出手段と、原稿の画像の線幅と前記原稿の画像の画像データに基づいて前記画像形成手段が形成するコピー画像の線幅とが等しくなるように、前記原稿画像の画像データを補正する第１の補正手段と、プリント画像の線幅が所定の線幅となるように、前記第２の補正値に基づいてプリント出力時の画像データを補正する第２の補正手段と、原稿の画像の線幅と原稿から読み取った画像の線幅とが等しくなるように、外部装置に送信対象の画像データを補正する第３の補正手段と、を備えることを特徴とする。 Further, the present invention includes an image reading means for reading an image, an image forming apparatus and an image forming means for forming an image on a recording material based on image data corresponding to the read image by said image reading means, the pattern First image data obtained by reading an image with the image reading means and a copy image formed on a recording material by the image forming means based on the first image data are obtained by reading with the image reading means. and second image data, the image forming apparatus 3 of a printed image obtained by forming on a recording material by said image forming means based on the correction data that have been stored obtained by reading by the image reading means A first correction based on a difference between the first image data and the second image data by comparison between the comparison means for comparing the image data and the comparison means. A second correction value based on the difference between the first image data and the third image data, and a third correction value based on the difference between the first correction value and the second correction value Calculating the image data of the document image so that the line width of the image of the document is equal to the line width of the copy image formed by the image forming unit based on the image data of the image of the document. a first correction means for correcting, as the line width of the printed image has a predetermined line width, and a second correction means for correcting the image data at the time of print output before SL based on the second correction value, so that the line width of the image read from the line width and the original document image becomes equal, characterized in that it comprises a third correction means for correcting the image data to be transmitted to the external device.

本発明によれば、原稿の画像の線幅とコピー画像の線幅とが等しくなるように、比較手段による第１の画像データと第２の画像データとの比較結果に基づいて原稿の画像の画像データを補正する。また、プリント画像の線幅が所定の線幅となるように、第２の補正値に基づいてプリント出力時の画像データを補正する。また、原稿の画像の線幅と原稿から読み取った画像の線幅とが等しくなるように、外部装置に送信対象の画像データを補正する。これにより、原稿の画像を複写して得たコピー画像の線幅の忠実再現性を向上させることが可能となると共に、コピー画像以外のプリント画像や画像データの線幅についても忠実再現性を向上させることが可能となる。 According to the present invention, based on the comparison result between the first image data and the second image data by the comparison unit , the line width of the original image and the line width of the copy image are made equal . Correct the image data . Further, the image data at the time of print output is corrected based on the second correction value so that the line width of the print image becomes a predetermined line width. Further, the image data to be transmitted to the external apparatus is corrected so that the line width of the image of the document is equal to the line width of the image read from the document. This makes it possible to improve the faithful reproducibility of the line width of the copy image obtained by copying the original image, and improve the fidelity reproducibility of the line width of the print image and image data other than the copy image. It becomes possible to make it.

更に、空間フィルタ部３０５３によりＲＧＢ画像データの周波数特性を修正し、ＬＯＧ処理部３０５４により輝度信号であるＲＧＢ画像データ（ＲＧＢ信号）を反転して濃度信号に変換することにより、ＹＭＣ信号を得る。更に、出力色処理部３０５５により公知の出力マスキング法や３次元ルックアップテーブル（ＬＵＴ）補間演算を用いて、ＹＭＣ信号からＹＭＣＫ信号に変換し、ガンマ補正部３０５６に入力する。 Further, the frequency characteristic of the RGB image data is corrected by the spatial filter unit 3053, and the RGB image data (RGB signal), which is a luminance signal, is inverted and converted into a density signal by the LOG processing unit 3054, thereby obtaining a YMC signal. Further, the output color processing unit 3055 converts the YMC signal into a YMCK signal using a known output masking method or a three-dimensional lookup table (LUT) interpolation calculation, and inputs the YMC signal to the gamma correction unit 3056.

Claims

An image forming apparatus comprising: an image reading unit that reads an image; and an image forming unit that forms an image on a recording material based on image data corresponding to the image read by the image reading unit .
First image data obtained by reading a pattern image by the image reading unit, and a copy image formed on a recording material by the image forming unit based on the first image data , and obtained by reading by the image reading unit A comparing means for comparing the second image data ;
As the line width of a copy image by the image forming means is formed on the basis of the image data of the image line width and the original images of originals are equal, the said first image data by said comparing means the Correction means for correcting the image data of the image of the document based on the comparison result with the image data of 2 ;
An image forming apparatus comprising:

The image forming apparatus according to claim 1, further comprising: a calculating unit that calculates a first correction value based on a difference between the first image data and the second image data by comparison of the comparing unit. apparatus.

The correcting means is based on the first correction value calculated by the first calculating means for the image data of the copy image formed by the image forming means based on the image data of the image of the document. The image data of the document image is obtained by performing thinning processing for thinning out dots included in the copy image formed by the image forming unit or thickening processing for adding dots based on the image data of the image of the document. The image forming apparatus according to claim 2, wherein a line width of a copy image formed by the image forming unit is corrected based on the image forming unit.

An image forming apparatus comprising: an image reading unit that reads an image; and an image forming unit that forms an image on a recording material based on image data corresponding to the image read by the image reading unit .
First image data obtained by reading a pattern image by the image reading unit, and a copy image formed on a recording material by the image forming unit based on the first image data , and obtained by reading by the image reading unit and second image data, third to the print image obtained by forming on a recording material by said image forming means based on the correction data that have been stored in the image forming apparatus obtained by reading by the image reading means Comparison means for comparing the image data of
Based on a comparison between the first image data and the second image data, and a difference between the first image data and the third image data based on the comparison by the comparison unit. Calculating means for calculating a third correction value based on a second correction value and a difference between the first correction value and the second correction value;
First correction means for correcting the image data of the original image so that the line width of the image of the original and the line width of the copy image formed by the image forming means are equal based on the image data of the image of the original When,
As the line width of the printed image has a predetermined line width, and a second correction means for correcting the image data at the time of print output based on the previous SL second correction value,
As is the line width of the image read from the line width and the original document image becomes equal, and the third correction means for correcting the image data to be transmitted to an external device,
An image forming apparatus comprising:

The image forming unit includes a photosensitive drum on which a latent image of an image to be transferred to a recording material is formed.
Correcting the line width, claims 1 to 4 or 1 and performs independently in the sub scanning direction is a rotational direction of the photosensitive drum and the main scanning direction parallel to the rotation axis of the photosensitive drum The image forming apparatus according to Item .

The pattern image, before Symbol main scanning direction, or pre-Symbol sub scanning direction, or both the sub-scanning direction and the main scanning direction or in an oblique direction not parallel to the main scanning direction, a single color having a plurality of concentrations or Multiple types of line images consisting of multiple colors,
The image forming apparatus according to claim 1, wherein the correction amount of the line width is a correction amount of a plurality of stages set according to the line width, density, and color. .

The image forming apparatus according to claim 6, wherein a correction amount is determined by linear interpolation between the plurality of correction amounts.

Maximum density correction control for correcting the maximum density of toner used for developing a latent image of an image transferred to a recording material, gradation correction control for correcting gradation in color image formation, and line width correction control for correcting the line width The image forming apparatus according to claim 1 , wherein the image forming apparatus is executed in the following order.

An image area separating function for determining which image area is a character (character), graphic (graphic), or photograph (image) in image data obtained by reading from a document by the image reading means;
For each of the image areas, setting out the correction of the line width including adjustment of the correction amount of the line width, or according to claim 1 or 4, characterized in that the correction of the line width can be set is not performed Image forming apparatus.

  In an image forming apparatus including an image forming unit that forms an image on a recording material based on image data corresponding to an image read by an image reading unit,
  First image data obtained by reading a pattern image by the image reading unit, and a copy image formed on a recording material by the image forming unit based on the first image data, and obtained by reading by the image reading unit A comparing means for comparing the second image data;
  The first image data and the second image data by the comparison unit are set so that the line width of the image of the document and the line width of the copy image formed by the image forming unit are equal based on the image data of the image of the document. Correction means for correcting the image data of the image of the document based on the comparison result with the image data of
An image forming apparatus comprising:

The correction unit is configured to apply the original document based on the first correction value calculated by the calculation unit to the image data of the copy image formed by the image forming unit based on the image data of the image of the original document. Based on the image data of the original image, the thinning process for thinning out the dots included in the copy image formed by the image forming unit or the thickening process for adding the dots based on the image data of the original image is performed. The image forming apparatus according to claim 2, wherein a line width of a copy image formed by the image forming unit is corrected.