JPH06311376A - Color detector - Google Patents

Color detector

Info

Publication number
JPH06311376A
JPH06311376A JP5093191A JP9319193A JPH06311376A JP H06311376 A JPH06311376 A JP H06311376A JP 5093191 A JP5093191 A JP 5093191A JP 9319193 A JP9319193 A JP 9319193A JP H06311376 A JPH06311376 A JP H06311376A
Authority
JP
Japan
Prior art keywords
color
pixel
pixels
ghost
picture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5093191A
Other languages
Japanese (ja)
Inventor
Kenichi Obara
謙一 小原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP5093191A priority Critical patent/JPH06311376A/en
Publication of JPH06311376A publication Critical patent/JPH06311376A/en
Pending legal-status Critical Current

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  • Image Analysis (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Image Processing (AREA)
  • Color Image Communication Systems (AREA)

Abstract

PURPOSE:To attain accurate color picture detection by detecting an area in which prescribed number of picture elements discriminated to be color picture elements are adjacent. CONSTITUTION:Density data, MCF and SCF signals outputted from a CS(color separate means) 3 are given to a ghost correction means 4, in which ghost is discriminated by taking notice of consecutive picture elements of the MCF and SCF in the main and subscanning directions and when the pattern is coincident with a predetermined pattern. A picture element discriminated to be a color ghost is set to the MCF and a picture element discriminated to be a black ghost is set to the SCF as a flag. A CPU 5 uses a microprocessor and a ROM/RAM, a communication circuit, a timer circuit and an I/O circuit to control an original radiation lamp of an image input terminal section, a motor of an optical system and a digital processing means 2, the CS 3 and the means 4. Furthermore, an automatic color detection means ACS 6 is controlled and based on information presence of a color picture from the means 6, a picture recording section and a copy number counter are controlled. Thus, a color picture of an original is accurately detected.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、プラスNカラーまたは
フルカラーの画像処理装置の自動色検知(ACS)装置
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic color detection (ACS) device for a plus N color or full color image processing device.

【0002】[0002]

【従来の技術】プラテン上に載置された原稿は、露光ラ
ンプにて照射され、CCD等の固体撮像素子により、フ
ルカラー情報R、G、B信号として色分離手段に送られ
る。色分離手段では、このR、G、B各信号により、着
目画素が色画素であるか黒画素であるかを決定してい
る。該色画素、該黒画素情報により、読み取った原稿が
白黒かカラーかを識別する方法としては、特開平3−6
4267号公報、特開平3−64269号公報で示され
る様に、主走査ラインの判定区間内の色画素数をカウン
トし、その色画素数が所定数以上のものを頁内で加算
し、判定対象の全画素数との比率を求め、その比率が所
定数より大きい時に原稿に色があると判定したり、原稿
領域を適当なサイズの小領域に分割しその領域内の色画
素数のカウントをし、色画素数が所定数以上あった小領
域を頁内で加算し、所定数を超えて存在する場合にカラ
ー原稿と判定する方法や、特開平3−64272号公報
で示されるように、1ラインまたは数ライン単位の中
で、色画素が所定数以上あったライン数を所定幅と比較
することによって、原稿内の色画像の有無の判定を行う
方法が提案されている。
2. Description of the Related Art A document placed on a platen is irradiated with an exposure lamp and sent to a color separation means as full color information R, G, B signals by a solid-state image pickup device such as CCD. The color separation means determines whether the pixel of interest is a color pixel or a black pixel based on the R, G, and B signals. As a method for identifying whether a read document is black and white or color based on the color pixel and black pixel information, Japanese Patent Laid-Open No. 3-6
As described in Japanese Patent No. 4267 and Japanese Patent Laid-Open No. 3-64269, the number of color pixels in the determination section of the main scanning line is counted, and if the number of color pixels is equal to or more than a predetermined number is added in the page, determination is performed. Calculate the ratio with the total number of target pixels, determine that the original has color when the ratio is greater than a predetermined number, or divide the original area into small areas of appropriate size and count the number of color pixels in that area. Then, a small area in which the number of color pixels is a predetermined number or more is added in the page, and when it exceeds the predetermined number, it is determined as a color original document, or as disclosed in JP-A-3-64272. There has been proposed a method of determining the presence / absence of a color image in a document by comparing the number of lines having a predetermined number or more of color pixels in a unit of one line or several lines with a predetermined width.

【0003】[0003]

【発明が解決しようとする課題】しかしながら従来の方
法では以下のような問題があった。光学的に原稿の画像
を読み取る画像処理装置において、原稿内の画像の輪郭
部分で画像の色と異なる色を生じる場合がある。例えば
図1に示すように、1画素を構成するR、G、B各画素
列が主走査方向に並んでいるフルカラーセンサーで白黒
画像を読み取った場合において、1画素列全てが黒を読
み取った時は、R、G、B各素子の出力レベルがほぼ同
一であるため、後段の色分離手段によって無彩色と判定
されるが、例えば白黒のエッジ部がこの画素列内にある
時には、R、G、B各素子の出力レベルがそれぞれ異な
ってくるため、有彩色と判断されてしまい、画像エッジ
部にて色画素が発生してしまう(以下ゴーストと略称す
る)。
However, the conventional method has the following problems. In an image processing apparatus that optically reads an image of a document, a color different from the color of the image may occur at the contour portion of the image in the document. For example, as shown in FIG. 1, when a black-and-white image is read by a full-color sensor in which R, G, and B pixel rows forming one pixel are arranged in the main scanning direction, when all the one pixel rows read black. The output levels of the R, G, and B elements are almost the same, so that the color separation unit in the subsequent stage determines that the color is achromatic. For example, when a black and white edge is in this pixel row, , B, the output levels of the B and B elements are different from each other, so that the element is determined to be a chromatic color and a color pixel is generated at the image edge portion (hereinafter, abbreviated as ghost).

【0004】また、図2に示すような、R、G、B各画
素列が副走査に並んでいる3ラインフルセンサの場合
は、もともと副走査方向の読み取り位置が異なるため、
基準画素に対し残りの画素を遅延させて同一の位置を読
み取るようにしているが、例えば、駆動系の速度ムラ
や、読み取り倍率によっては、副走査方向の読み取り位
置が必ずしも同一とならず、密着型センサの場合と同じ
理由で、白黒のエッジ部で副走査方向にゴーストが発生
してしまう。また、主走査方向も光学系の色収差によ
り、R、G、B各画素列の主走査方向の読み取り位置が
異なってくることにより、同様にゴーストが発生する。
このようなゴーストの発生を減少させる手段として、密
着型センサでは、主走査方向のR、G、B各画素の読み
取り位置を仮想的に一致させる読み取り位置補正手段、
3ラインセンサでは副走査方向のR、G、B各画素の読
み取り位置を倍率に応じて一致させる読み取り位置補正
手段、また、発生したゴーストを除去する手段として、
黒画素に隣接した色画素を発生パターンに応じて除去す
るゴースト補正手段等が設けられている。
Further, in the case of a 3-line full sensor in which R, G, and B pixel rows are arranged in the sub-scan as shown in FIG. 2, the reading position in the sub-scanning direction is originally different,
The remaining pixels are delayed with respect to the reference pixel to read the same position. However, depending on the speed unevenness of the drive system and the reading magnification, the reading position in the sub-scanning direction is not always the same, and the close contact For the same reason as in the case of the die sensor, a ghost occurs in the sub-scanning direction at the black and white edge portion. Also in the main scanning direction, due to the chromatic aberration of the optical system, the reading position of each of the R, G, and B pixel columns in the main scanning direction differs, so that a ghost similarly occurs.
As a means for reducing the occurrence of such a ghost, in the contact sensor, a reading position correcting means for virtually matching the reading positions of R, G, and B pixels in the main scanning direction,
In the three-line sensor, as a reading position correcting unit that matches the reading positions of the R, G, and B pixels in the sub-scanning direction according to the magnification, and a unit that removes the generated ghost,
A ghost correction unit or the like for removing the color pixel adjacent to the black pixel according to the generation pattern is provided.

【0005】しかし、画像読み取り部の走査速度ムラに
起因する読み取り位置ズレ、外的な要因が加えられたこ
とによって発生した振動に起因する読み取り位置ズレ、
光学系の色収差による読み取り位置ズレ等は、前記の読
み取り位置補正手段では補正できないため、ゴーストの
発生を招き、そのゴーストは前記のゴースト補正手段で
は完全に除去しきれない場合があった。そのため従来の
自動色検知では、この除去しきれないゴーストも真の色
画素と同様にカウントしてしまうため、除去しきれない
ゴーストが多発した場合に、実際には原稿が白黒原稿の
場合でも、色検知が誤判定しカラー原稿であると判断す
る問題があった。本発明はこのゴーストによる色検知の
誤判定のない色検知装置を提供することを目的とする。
However, the reading position shift caused by the uneven scanning speed of the image reading section, the reading position shift caused by the vibration caused by the addition of external factors,
Since the reading position shift or the like due to the chromatic aberration of the optical system cannot be corrected by the reading position correction means, a ghost may be generated, and the ghost may not be completely removed by the ghost correction means. Therefore, in the conventional automatic color detection, since ghosts that cannot be completely removed are counted in the same manner as true color pixels, when many ghosts that cannot be completely removed occur, even if the original is actually a black and white original, There is a problem that the color detection is erroneously determined and it is determined that the original is a color original. It is an object of the present invention to provide a color detection device that does not cause an erroneous determination of color detection due to this ghost.

【0006】[0006]

【課題を解決するための手段】本発明は、プラテン上に
載置された原稿の画像を光学的に走査し、各画素毎に複
数色信号を出力する走査手段と、この複数色信号に基づ
いて当該画素が色画素であるか否かを各画素毎に判別す
る判別手段と、この色画素判別手段によって色画素と判
別された画素が所定数以上隣接した部分を検知する検知
手段とを備え、この検知手段により前記原稿が色画素を
有することを検知するものである。また、前記判別手段
は、色画素、黒画素および白画素のいずれであるかを各
画素毎に判別するものであり、前記検知手段は、前記色
画素判別手段によって色画素と判別された画素が所定数
以上隣接するとともにこれら隣接した画素が黒画素に隣
接していない部分を検知するものである。色画素が所定
数以上隣接した領域をゴーストが発生する領域よりも大
きくすることにより、孤立した色画素やゴーストによる
色画素の影響を受けることもなく原稿の色画像を検知す
ることができる。また、色画素が所定数以上隣接すると
ともに黒画素に隣接していない領域を検知することによ
り、色画素が所定数以上隣接した領域を小さくすること
ができ、密度の高い色検知ができる。
SUMMARY OF THE INVENTION According to the present invention, there is provided scanning means for optically scanning an image of a document placed on a platen and outputting a plurality of color signals for each pixel, and a scanning means based on the plurality of color signals. And a detection unit for detecting whether or not the pixels determined to be color pixels by the color pixel determination unit are adjacent to each other by a predetermined number or more. The detection means detects that the document has color pixels. Further, the discrimination means discriminates for each pixel whether it is a color pixel, a black pixel or a white pixel, and the detection means detects that the pixel discriminated as a color pixel by the color pixel discrimination means. This is to detect a portion where a predetermined number or more are adjacent to each other and the adjacent pixels are not adjacent to the black pixel. By making the area where a predetermined number of color pixels are adjacent to each other larger than the area where the ghost occurs, it is possible to detect the color image of the document without being affected by the isolated color pixel or the color pixel due to the ghost. Further, by detecting an area in which the color pixels are adjacent to each other by a predetermined number or more and is not adjacent to the black pixel, an area in which the color pixels are adjacent to each other by the predetermined number or more can be made small, and the color can be detected with high density.

【0007】[0007]

【実施例】以下、図面を参照しつつ実施例を説明する。
図3と図5は、本発明に係る画像処理装置の自動色検知
装置をプラス1カラー方式の複写機に適用した場合の一
実施例であり、図中、1はイメージ入力ターミナル(以
下、IITと称す)、2はデジタル化処理手段、3は色
分離手段(以下、CSと称す)、4はゴースト補正手段
(以下、GCと称す)、5は制御手段(以下、CPUと
称す)、6は自動色検知手段(以下、ACSと称す)を
示す。以下、各ブロックについて説明する。IIT1
は、プラテンガラス、プラテンカバー、原稿を照射する
ための走査光学系、フルカラーセンサ及びこれらの駆動
回路を備えるものであり、緑(G)、青(B)、赤
(R)の3色アナログ濃度信号を出力する。
Embodiments will be described below with reference to the drawings.
3 and 5 show an embodiment in which the automatic color detection device of the image processing device according to the present invention is applied to a +1 color type copying machine. In FIG. 3, 1 is an image input terminal (hereinafter referred to as IIT). 2) digitization processing means, 3 color separation means (hereinafter referred to as CS), 4 ghost correction means (hereinafter referred to as GC), 5 control means (hereinafter referred to as CPU), 6 Indicates automatic color detection means (hereinafter referred to as ACS). Each block will be described below. IIT1
Includes a platen glass, a platen cover, a scanning optical system for illuminating an original, a full color sensor, and a drive circuit for these, and three color analog densities of green (G), blue (B), and red (R). Output a signal.

【0008】IIT1から出力されたG、B、Rのアナ
ログ濃度信号はデジタル化処理手段2に入力され、利得
調整、オフセット調整が施された後に所定のビット数、
例えば8ビットのデジタル濃度信号となされ、更にシェ
ーディング補正が施された後に3色のデジタル信号は同
時信号としてCS3に入力される。CS3は入力された
G、B、Rの濃度に基づいて、当該画素が指定された色
(以下、これを有彩色と称す)かそれ以下の色(以下、
これを無彩色と称す)かを判断し、濃度データと、各種
のフラグ、図3、図4ではメインカラーフラグ(MC
F)、サブカラーフラグ(SCF)の2つのフラグを出
力する。MCFとSCFは画素が有彩色か無彩色を示す
フラグであり、MCFは無彩色の画素で、且つその濃度
が所定の値、例えば濃度範囲が絶対白から絶対黒まで2
56階調とした場合、10〜20程度の値以上の時のみ
1、それ以外は0となされ、SCFは有彩色の画素で、
且つその濃度が所定の値、例えば上記の濃度範囲では
1、以上の時にのみ1となされるものとする。
The G, B, and R analog density signals output from the IIT 1 are input to the digitization processing means 2 and subjected to gain adjustment and offset adjustment, and then a predetermined number of bits,
For example, an 8-bit digital density signal is formed, and after shading correction, the three-color digital signals are input to CS3 as simultaneous signals. Based on the input densities of G, B, and R, CS3 is a color (hereinafter, referred to as a chromatic color) in which the pixel is designated or a color below (hereinafter, referred to as chromatic color).
This is referred to as achromatic color), and the density data and various flags, the main color flag (MC
F) and a sub color flag (SCF) are output. MCF and SCF are flags indicating whether the pixel is a chromatic color or an achromatic color, and MCF is an achromatic pixel and its density is a predetermined value, for example, the density range is 2 from absolute white to absolute black.
In the case of 56 gradations, it is set to 1 only when the value is about 10 to 20 or more, and 0 otherwise. SCF is a chromatic pixel,
In addition, the density is set to a predetermined value, for example, 1 in the density range described above, and is set to 1 only when the density is equal to or more than the predetermined value.

【0009】CS3から出力された濃度データ、MC
F、SCF信号はゴースト補正手段4に入力され、MC
F及びSCFを主走査方法および副走査方向のそれぞれ
連続している画素に注目し、予め決めてあるパターンと
一致した時、ゴーストと判定する。ここで色ゴーストと
判定された画素はMCFに、黒ゴーストと判定された画
素はSCFにそれぞれフラグの入れ替えを行う。CPU
5はマイクロプロセッサの他、ROM/RAM、通信回
路、タイマ回路、I/O回路等を有し、前述のIIT1
部の原稿照射ランプ、光学系を駆動するモータ及び、デ
ジタル化処理手段2、CS3、GC4の制御を行う。ま
た、後述するACS6の制御を行い、さらにACS6で
得られた色画像有り情報を基に、画像記録部やコピー枚
数カウンタの制御を行う。
Concentration data output from CS3, MC
The F and SCF signals are input to the ghost correction means 4, and MC
Focusing on pixels that are continuous in the main scanning method and the sub-scanning direction in F and SCF, and when they match a predetermined pattern, it is determined to be a ghost. Here, the pixels that are determined to be color ghosts are switched to MCF, and the pixels that are determined to be black ghosts are switched to SCF, respectively. CPU
5 has a microprocessor, ROM / RAM, communication circuit, timer circuit, I / O circuit, etc.
The original irradiation lamp, the motor for driving the optical system, and the digitization processing means 2, CS3, and GC4 are controlled. Further, it controls the ACS 6 described later, and further controls the image recording unit and the copy number counter based on the color image presence information obtained in the ACS 6.

【0010】次にACS6の動作について説明する。A
CS6は、原稿内に連続する色画素列が有り、その画素
列に隣接する画素が、色もしくは白画素の場合に、原稿
内に色画素が有ると判断する。図5に示した例の場合、
連続する色画素列は主走査に4画素、副走査に4画素で
あり、黒画素との隣接ギャップは2画素である。図4に
示すように、白画素抽出回路61で濃度データ、MC
F、CPU5の設定データを基に白画素を抽出する。こ
こでCPU5の設定データは濃度のスレッシュデータで
ある。白画素は、図6に示すように、MCFが0の時、
もしくは濃度データがCPU5から設定されたスレッシ
ュデータより低い場合に得られる。抽出された白画素と
SCFはFIFO63により複数ライン遅延され、白/
色画素判定回路に入力する。白/色画素判定回路では図
5に示すマトリクスで、白もしくは色画素を判定する場
合、まずセレクタ651で8ビットのデータ幅を選択す
る。選ばれた8ビットのデータをAND652で論理積
を取り、シフトレジスタ653で画素同期信号VCLK
に同期し、8ビットデータに変換し、AND654で論
理積を取る。従って図5に示すような8×8のマトリク
スで画素が全て白もしくは色の場合、AND654の出
力は1となり、マトリクス内に1画素でも黒画素がある
場合は0を出力する。
Next, the operation of ACS 6 will be described. A
The CS 6 determines that there is a color pixel in the document when there is a continuous color pixel column in the document and the pixel adjacent to the pixel column is a color or white pixel. In the case of the example shown in FIG.
The continuous color pixel row has 4 pixels in the main scanning and 4 pixels in the sub scanning, and the adjacent gap to the black pixel is 2 pixels. As shown in FIG. 4, in the white pixel extraction circuit 61, density data, MC
F, white pixels are extracted based on the setting data of the CPU 5. Here, the setting data of the CPU 5 is density threshold data. As shown in FIG. 6, the white pixel has a MCF of 0,
Alternatively, it is obtained when the density data is lower than the threshold data set by the CPU 5. The extracted white pixel and SCF are delayed by a plurality of lines by the FIFO 63, and white / white
Input to the color pixel determination circuit. In the white / color pixel determination circuit, when determining a white or color pixel in the matrix shown in FIG. 5, the selector 651 first selects an 8-bit data width. The selected 8-bit data is ANDed by the AND 652, and the pixel register signal VCLK is generated by the shift register 653.
In synchronism with, the data is converted into 8-bit data, and the logical product is obtained by AND 654. Therefore, when all the pixels are white or color in the 8 × 8 matrix as shown in FIG. 5, the output of the AND 654 is 1, and 0 is output when there is even one black pixel in the matrix.

【0011】次に、色画素判定回路では、FIFO64
で複数ライン遅延させ入力した後、セレクタ661で白
/色画素判定回路より2ライン遅延した4ビットのデー
タをAND662で論理積を取り、シフトレジスタ66
3で画素同期信号VCLKに同期し、4ビットデータに
変換し、AND664で論理積を取る。従って、図5に
示すようなマトリクスにおける中心部の4×4のマトリ
ックスの画素が全て色の場合、AND664の出力は1
となり、マトリクス内に1画素でも無彩色の画素がある
場合は0を出力する。色画像判定回路では、色画素判定
回路のデータを白/色画素判定回路のデータと遅延整合
回路671でデータの遅延整合を取り、AND672で
論理積を取る。色画素判定回路の結果、白色判定回路の
結果が共に1の場合はAND672の出力が1となりフ
リップフロップ673に1がセットされ、CPU5が原
稿内に色画像が有ると判断することができる。なお、本
実施例では色画素と判別された画素が所定数以上隣接し
た領域を2次元の矩形領域として説明したが、1次元の
矩形領域であってもよい。また、1次元の矩形領域を例
えば直交する2方向のように幾つかの方向で組み合わせ
て用いることが望ましい。
Next, in the color pixel determination circuit, the FIFO 64
After delaying input by a plurality of lines with, the selector 661 logically ANDs the 4-bit data delayed by 2 lines from the white / color pixel determination circuit with the AND 662, and shift register 66
The data is converted into 4-bit data in synchronism with the pixel synchronization signal VCLK at 3, and ANDed by AND 664. Therefore, when all the pixels of the central 4 × 4 matrix in the matrix as shown in FIG.
Therefore, if even one pixel has an achromatic pixel in the matrix, 0 is output. In the color image determination circuit, the data of the color pixel determination circuit and the data of the white / color pixel determination circuit are delay-matched by the delay matching circuit 671 and the logical product is obtained by AND 672. If the results of the color pixel determination circuit are both 1 in the white determination circuit, the output of the AND 672 becomes 1 and 1 is set in the flip-flop 673, and the CPU 5 can determine that there is a color image in the original. In this embodiment, the area in which the pixels determined to be color pixels are adjacent to each other by a predetermined number or more is described as a two-dimensional rectangular area, but may be a one-dimensional rectangular area. Further, it is desirable to combine and use one-dimensional rectangular areas in several directions such as two orthogonal directions.

【0012】[0012]

【発明の効果】本発明は、検知手段により色画素と判別
された画素が所定数以上隣接した領域を検知し、この検
知手段により原稿が色画像を有することを検知する。従
って、ゴーストの起きる可能性がある黒画素や孤立した
色画素は検知手段にて検知されず、原稿の色画像を正確
に検知できる。
According to the present invention, an area in which a predetermined number or more of pixels determined to be color pixels by the detecting means are adjacent to each other is detected, and the detecting means detects that the original has a color image. Therefore, the black pixel or the isolated color pixel in which ghost may occur is not detected by the detection unit, and the color image of the document can be accurately detected.

【図面の簡単な説明】[Brief description of drawings]

【図1】フルカラーセンサの画素配列を示した図であ
る。
FIG. 1 is a diagram showing a pixel array of a full color sensor.

【図2】3ラインフルカラーセンサの画素配列を示した
図である。
FIG. 2 is a diagram showing a pixel array of a 3-line full color sensor.

【図3】本発明に係る画像処理装置の自動色検知装置を
プラス1カラー方式の複写機に適用した場合の一実施例
の構成を示す概略ブロック図である。
FIG. 3 is a schematic block diagram showing the configuration of an embodiment in which the automatic color detection device of the image processing apparatus according to the present invention is applied to a +1 color type copying machine.

【図4】自動色検知手段の詳細を示すブロック図であ
る。
FIG. 4 is a block diagram showing details of automatic color detection means.

【図5】色検知の判定マトリクス例を示す図である。FIG. 5 is a diagram showing an example of a determination matrix for color detection.

【図6】自動色検知手段の白画素抽出回路のブロック図
である。
FIG. 6 is a block diagram of a white pixel extraction circuit of automatic color detection means.

【図7】自動色検知手段の白/色画素判定回路のブロッ
ク図である。
FIG. 7 is a block diagram of a white / color pixel determination circuit of automatic color detection means.

【図8】自動色検知手段の色画素判定回路のブロック図
である。
FIG. 8 is a block diagram of a color pixel determination circuit of automatic color detection means.

【図9】自動色検知手段の色画像判定回路のブロック図
である。
FIG. 9 is a block diagram of a color image determination circuit of automatic color detection means.

【符号の説明】[Explanation of symbols]

1 イメージ入力ターミナル(IIT) 2 デジタル化処理手段 3 色分離手段(CS) 4 ゴースト補正手段(GC) 5 制御手段(CPU) 6 自動色検知手段(ACS) 60 タイミング回路 61 白画素抽出回路 62 OR回路 63 FIFO 65 白/色画素判定回路 66 色画素判定回路 67 色画像判定回路 651 セレクタ(SEL) 652 AND回路 653 シフトレジスタ(S/R) 664 AND回路 671 遅延回路 672 AND回路 673 フリップフロップ 1 image input terminal (IIT) 2 digitization processing means 3 color separation means (CS) 4 ghost correction means (GC) 5 control means (CPU) 6 automatic color detection means (ACS) 60 timing circuit 61 white pixel extraction circuit 62 OR Circuit 63 FIFO 65 White / color pixel determination circuit 66 Color pixel determination circuit 67 Color image determination circuit 651 Selector (SEL) 652 AND circuit 653 Shift register (S / R) 664 AND circuit 671 Delay circuit 672 AND circuit 673 Flip-flop

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 プラテン上に載置された原稿の画像を光
学的に走査し、各画素毎に複数色信号を出力する走査手
段と、この複数色信号に基づいて当該画素が色画素であ
るか否かを各画素毎に判別する判別手段と、この色画素
判別手段によって色画素と判別された画素が所定数以上
隣接した部分を検知する検知手段とを備え、この検知手
段により前記原稿が色画素を有することを検知する色検
知装置。
1. A scanning unit that optically scans an image of a document placed on a platen and outputs a plurality of color signals for each pixel, and the pixel is a color pixel based on the plurality of color signals. It is provided with a discriminating means for discriminating whether or not each pixel is present, and a detecting means for detecting a portion where the pixels discriminated as color pixels by the color pixel discriminating means are adjacent to each other by a predetermined number or more. A color detection device for detecting the presence of color pixels.
【請求項2】 請求項1記載の色検知装置において、前
記判別手段は、色画素、黒画素および白画素のいずれで
あるかを各画素毎に判別するものであり、前記検知手段
は、前記色画素判別手段によって色画素と判別された画
素が所定数以上隣接するとともにこれら隣接した画素が
黒画素に隣接していない部分を検知することを特徴とす
る色検知装置。
2. The color detection device according to claim 1, wherein the discrimination means discriminates for each pixel whether the pixel is a color pixel, a black pixel or a white pixel. A color detection device characterized in that a predetermined number or more of pixels determined to be color pixels by the color pixel determination means are adjacent to each other and a portion where these adjacent pixels are not adjacent to a black pixel is detected.
JP5093191A 1993-04-20 1993-04-20 Color detector Pending JPH06311376A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5093191A JPH06311376A (en) 1993-04-20 1993-04-20 Color detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5093191A JPH06311376A (en) 1993-04-20 1993-04-20 Color detector

Publications (1)

Publication Number Publication Date
JPH06311376A true JPH06311376A (en) 1994-11-04

Family

ID=14075693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5093191A Pending JPH06311376A (en) 1993-04-20 1993-04-20 Color detector

Country Status (1)

Country Link
JP (1) JPH06311376A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003125208A (en) * 2001-08-08 2003-04-25 Hewlett Packard Co <Hp> Apparatus for predominant color identification in digital image

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003125208A (en) * 2001-08-08 2003-04-25 Hewlett Packard Co <Hp> Apparatus for predominant color identification in digital image

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