JPH0614185A - Image reader - Google Patents
Image readerInfo
- Publication number
- JPH0614185A JPH0614185A JP4169524A JP16952492A JPH0614185A JP H0614185 A JPH0614185 A JP H0614185A JP 4169524 A JP4169524 A JP 4169524A JP 16952492 A JP16952492 A JP 16952492A JP H0614185 A JPH0614185 A JP H0614185A
- Authority
- JP
- Japan
- Prior art keywords
- density
- signal
- mode
- image
- original
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000003705 background correction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Control Or Security For Electrophotography (AREA)
- Facsimile Image Signal Circuits (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は画像読取装置に関し、特
にディジタル複写機に好適な出力濃度補正技術に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus, and more particularly to an output density correction technique suitable for a digital copying machine.
【０００２】[0002]
【従来の技術】従来、画像読取装置の文字原稿における
露光量制御は次のように行われている。2. Description of the Related Art Conventionally, the exposure amount control for a text original of an image reading apparatus is performed as follows.
【０００３】図１の（Ａ）に示すように、原稿を前もっ
て走査し、イメージセンサに読み込まれた光量信号を濃
度信号に変換して濃度ヒストグラムを作成する。次に、
図１の（Ｂ）に示すように、このヒストグラムのうち頻
度の高い濃度レベルを２か所抽出し、濃度の高い方を
“黒”、低い方を“地色”として、“黒”が最大濃度、
“地色”が０となるように濃度信号を補正する。As shown in FIG. 1A, a document is scanned in advance and the light quantity signal read by the image sensor is converted into a density signal to create a density histogram. next,
As shown in FIG. 1B, two high density density levels are extracted from this histogram, the higher density is “black”, the lower density is “ground color”, and “black” is the maximum. concentration,
The density signal is corrected so that the "ground color" becomes zero.
【０００４】なお実際には、あらかじめ濃度補正テーブ
ルを数種類ルックアップテーブルに持っており、“地
色”レベルと“黒”レベルの検出値に従って、そのうち
のひとつを濃度補正用に選択している。そして、使用者
から“薄く”，“濃く”の指定があると、このテーブル
を切り換えることによりその指定に対応している。Actually, several kinds of density correction tables are stored in advance as lookup tables, and one of them is selected for density correction according to the detected values of the "ground color" level and the "black" level. When the user specifies "light" or "dark", the table is switched to correspond to the specification.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
ような従来例では、“地色”よりも濃い色味を持つ画像
信号は再現しようとする。このため、たとえば両面印刷
で裏うつりしている原稿や、薄い原稿を重ねていて次の
原稿が透けるような場合、本来必要でないそれらの裏う
つりや透けたものの信号も画像として複写されてしま
う。このため使用者は「試しどり」をして手動で濃度を
操作したり、原稿を１枚にするなどの繁雑な操作が必要
となった。However, in the above-described conventional example, an image signal having a darker tint than the "ground color" is to be reproduced. For this reason, for example, in the case where an original document which is back-printed by double-sided printing or a thin document is overlapped and the next document is transparent, those signals which are not originally necessary and the transparent document are also copied as an image. For this reason, the user needs to perform a “trial” and manually operate the density, or perform complicated operations such as making one original.
【０００６】本発明の目的は、上述のような点に鑑み、
使用者の手をわずらわせずに自動的に裏うつりしない複
写を行うことのできる画像読取装置を提供することにあ
る。In view of the above points, an object of the present invention is to
An object of the present invention is to provide an image reading apparatus capable of automatically making a copy without back-printing without the user's hand.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、原稿画像を読み取り、濃度信号を出力す
る画像読取手段と、裏とばしモードを指定する指定手段
と、前記裏とばしモードの指定に応じて、原稿の裏面や
重ねた次頁の原稿が透過して複写されない濃度に、前記
濃度信号に対して濃度補正を行う濃度補正手段とを具備
したことを特徴とする。In order to achieve the above object, the present invention provides an image reading means for reading a document image and outputting a density signal, a designating means for designating a back-side skip mode, and a back-side stripping mode. According to the designation, a density correction unit is provided for correcting the density of the density signal so that the back surface of the original or the original on the next page is not transmitted and copied.
【０００８】また、本発明は、好ましくは、前記指定手
段は使用者が前記裏とばしモードを指定できる。Further, in the present invention, it is preferable that the designating means allows a user to designate the back-through mode.
【０００９】また、本発明は、好ましくは、前記指定手
段は前記濃度信号の濃度ヒストグラムに基づいて自動的
に裏うつり部分を判定し、該判定に基づいて前記裏とば
しモードを指定することができる。Further, in the present invention, it is preferable that the designating means can automatically determine the back-side offset portion based on the density histogram of the density signal, and specify the back-outside mode based on the determination. .
【００１０】また、本発明は、好ましくは、前記濃度補
正手段は前記判定に基づいて裏うつり部分を地色とみな
して前記濃度補正を行うことができる。Further, according to the present invention, preferably, the density correcting means can carry out the density correction by recognizing the back-behind portion as a ground color based on the judgment.
【００１１】また、本発明は、好ましくは、前記濃度補
正手段は原稿の文字または２値画像領域に対してのみ前
記濃度補正を行うことができる。Further, according to the present invention, preferably, the density correction means can perform the density correction only for a character or a binary image area of a document.
【００１２】また、本発明は、好ましくは、前記指定手
段は、両面複写モードの際には、自動的に前記裏とばし
モードを指定することができる。Further, in the present invention, it is preferable that the designating means can automatically designate the back-outside mode in the double-sided copying mode.
【００１３】[0013]
【作用】本発明では、原稿の裏面や次頁の原稿が透過し
て複写されないようにするための濃度補正を自動的に行
う特定モードを設け、このモードのときの濃度補正を自
動的に行うようにしているので、使用者が無駄な労力を
使うことなく、裏うつりが複写されない見やすい複写物
が容易に得られる。According to the present invention, a specific mode is provided for automatically performing the density correction for preventing the back side of the original or the original on the next page from being transmitted and copied, and the density correction in this mode is automatically performed. Therefore, the user can easily obtain an easy-to-see copy without the back slip being copied, without wasting labor.
【００１４】[0014]
【実施例】以下、図面を参照して本発明の実施例を詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【００１５】（第１の実施例）図２は本発明の第１の実
施例における画像読取装置の回路構成を示す。図中、１
０１は原稿の画像を読み取るＣＣＤ（電荷結合素子）イ
メージセンサ、１０２はＣＣＤイメージセンサ１０１の
画素のばらつきや原稿照明光源の片よりを補正するシェ
ーディング補正回路である。１０３はＣＣＤイメージセ
ンサ１０１から読み込まれシェーディング補正処理を施
された光量信号を濃度信号に変換する光量−濃度変換部
である。(First Embodiment) FIG. 2 shows the circuit arrangement of an image reading apparatus according to the first embodiment of the present invention. 1 in the figure
Reference numeral 01 is a CCD (charge-coupled device) image sensor for reading an image of an original, and 102 is a shading correction circuit for correcting variations in pixels of the CCD image sensor 101 and one side of the original illumination light source. Reference numeral 103 denotes a light amount / density conversion unit that converts the light amount signal read from the CCD image sensor 101 and subjected to shading correction processing into a density signal.
【００１６】１０４はその濃度信号を基に画像１ライン
分のヒストグラムを生成し、“地色”、“黒”を検出す
る濃度検出回路である。１０５は「裏とばしモード」信
号、１０５′は「文字／写真モード」信号である。文字
／写真モード信号１０５′がＯＦＦのときは写真モード
であるとする。１０６は光量−濃度変換部１０３からの
濃度信号，濃度検出回路１０４からの検出信号、および
モード信号１０５，１０５′からなる入力信号に対する
出力信号の特性をあらかじめ格納したルックアップテー
ブル（以下、ＬＵＴと略記する）である。１０７は画像
のシャープネスを調節するフィルタリング部、１０８は
プリンタである。１０９は使用者が指示入力を行う操作
／表示部、１０１は操作部１０９の指示に従いモード信
号１０５，１０５′をＬＵＴ１０６に供給して画像処理
を制御するＣＰＵ（中央演算処理装置）である。A density detecting circuit 104 generates a histogram for one line of the image based on the density signal and detects "ground color" and "black". Reference numeral 105 is a "backside-out mode" signal, and 105 'is a "text / photo mode" signal. When the character / photograph mode signal 105 'is OFF, the photograph mode is assumed. Reference numeral 106 is a look-up table (hereinafter referred to as LUT) in which the characteristics of the output signal with respect to the input signal composed of the density signal from the light quantity-density converter 103, the detection signal from the density detection circuit 104, and the mode signals 105 and 105 'are stored in advance. Abbreviated). Reference numeral 107 is a filtering unit that adjusts the sharpness of the image, and 108 is a printer. Reference numeral 109 is an operation / display unit for the user to input an instruction, and 101 is a CPU (central processing unit) that supplies mode signals 105 and 105 'to the LUT 106 in accordance with an instruction from the operation unit 109 to control image processing.
【００１７】複写に際して、使用者は原稿を原稿読取台
（不図示）にセットし、操作部１０９のキーから「裏と
ばしモード」を指定して、スタートキーを押下する。プ
リスキャンの際、ＣＣＤイメージセンサ１０１から入力
した光量信号は、シェーディング補正回路１０２、光量
−濃度変換回路１０３を通って濃度信号に変換され、濃
度検出回路１０４に入力する。At the time of copying, the user sets a document on a document reading table (not shown), designates the "back-through mode" with the keys of the operation unit 109, and presses the start key. During the prescan, the light amount signal input from the CCD image sensor 101 is converted into a density signal through the shading correction circuit 102 and the light amount-density conversion circuit 103, and is input to the density detection circuit 104.
【００１８】この濃度検出回路１０４で図１に示したと
同様なヒストグラムにより“地色”濃度ａ、“黒”濃度
ｂを検出しこれらの検出値ａn ，ｂn （ｎは例えば１〜
７）をＬＵＴ１０６のアドレスに入力する。また、ＣＰ
Ｕ１１０からの「裏とばしモード」信号１０５、「文字
／写真モード」信号１０５′も上記と同様にＬＵＴ１０
６のアドレスに入力する。[0018] The concentration detected by the circuit 104 in the same histogram as shown in FIG. 1 "background" concentration a, "black" concentration b The detected these detected values a n, b n (n is, for example, 1
7) is input to the address of the LUT 106. Also, CP
The "outside print mode" signal 105 and the "text / photo mode" signal 105 'from the U110 are also in the LUT10 as described above.
Enter the address of 6.
【００１９】図３の（Ａ）〜（Ｃ）はＬＵＴ１０６の各
アドレス信号とそれに対応した濃度補正テーブルの内容
を示す。図３の（Ｃ）に示すように、「裏とばしモー
ド」が信号１０５により指示されたとき（すなわち、信
号１０５がＯＮ）には、そうでないとき（すなわち、信
号１０５がＯＦＦ）よりも１〜２段階薄い（いわゆる、
とびやすい）テーブルを選択して、裏うつり分の薄い色
味の入力濃度信号を“地色”として、飛ばしている。な
お、この「とばす」とは出力濃度値０を意味する。従っ
て、上記の「裏とばしモード」により、使用者の２度手
間を省いて効率よく必要な情報のみを複写できる。3A to 3C show each address signal of the LUT 106 and the contents of the density correction table corresponding thereto. As shown in (C) of FIG. 3, when the “back-through mode” is instructed by the signal 105 (that is, the signal 105 is ON), 1 to 1 is more than when it is not (that is, the signal 105 is OFF). 2 steps thin (so-called,
Select a table (easy to jump) and skip the input density signal of the light color of the back shift as “ground color”. It should be noted that this “skipping” means an output density value of 0. Therefore, by the above-mentioned "back-side out mode", only the necessary information can be efficiently copied without the user having to do the work twice.
【００２０】（第２の実施例）上記の本発明の第１の実
施例においては、使用者が操作部１０９から「裏とばし
モード」を入力指定していた。しかし、ＲＤＦ(Recycle
d Document Feeder)などの自動原稿送り装置のついた複
写機において、「両面→両面」，「両面→片面」等のモ
ードが選択された場合には、原稿が両面原稿であること
は明らかである。そこでこれらのモードの選択時には、
特に「裏とばしモード」の指定が使用者からなくても、
自動的に「裏とばしモード」に切り換えることにより、
さらに使用者による余計な入力操作を省略することがで
きる。(Second Embodiment) In the above-described first embodiment of the present invention, the user inputs and specifies the "back-through mode" from the operation unit 109. However, RDF (Recycle
In a copying machine equipped with an automatic document feeder such as d Document Feeder), it is clear that the original is a double-sided original when a mode such as “double-sided → double-sided” or “double-sided → single-sided” is selected. . So when selecting these modes,
In particular, even if the user does not specify the "backside out mode",
By automatically switching to the "backside out mode",
Further, it is possible to omit an unnecessary input operation by the user.
【００２１】（第３の実施例）原稿全体が単色の文字原
稿の場合には、通常濃度ヒストグラムの頻度の高い部分
は“地色”と“黒”の２つであると考えてよい。しか
し、裏うつりのある原稿の場合は、これに加えて、うつ
った分の“薄い字”もまたある程度の高い頻度で出現さ
れる。よって、この薄い字をヒストグラムを用いて判別
し、“薄い字”があると判定された単色文字原稿に対し
ては、自動的に“裏とばしモード”に入ることもでき
る。(Third Embodiment) In the case where the entire original is a monochrome original, it can be considered that there are two areas of high frequency in the normal density histogram, "ground color" and "black". However, in the case of a manuscript with a backface, in addition to this, the "light font" for the transferred part also appears with a certain high frequency. Therefore, it is possible to automatically enter the "back-through mode" for a monochromatic character original that is determined to have a "light character" by distinguishing this light character using a histogram.
【００２２】図４に、裏うつりがある単色文字原稿の場
合のヒストグラムの例を示す。図中のｃで示した斜線部
分が裏うつりによる濃度信号を表すと考えられる。そこ
で、「裏うつり濃度」が出現すると思われる濃度（図中
のｄで示す）でスライスレベルをあらかじめ設定し、ｄ
よりも薄い濃度である頻度（図中のｅ）よりも多いもの
があれば、その濃度を“地色”レベルａ′と判定してし
まう。このようにすれば自動的に裏うつり画像は消去さ
れる。FIG. 4 shows an example of a histogram in the case of a single-color character original having back-side printing. It is considered that the shaded portion indicated by c in the figure represents the density signal due to the backsiding. Therefore, the slice level is set in advance with a density (indicated by d in the figure) which is considered to cause the "back slip density", and d
If there is a density that is lower than the frequency (e in the figure) that is a lower density, the density is determined to be the "ground color" level a '. In this way, the back-faced image is automatically erased.
【００２３】ただし、上記の地色判定処理が適用できる
のは文字のような２値画像の場合であり、写真などの多
値画像ではこの方法を採用するとハイライト部が再現さ
れず、白くとんでしまう。従って、上記のような自動裏
とばしモードは、プリスキャン時のサンプリングで「こ
れは文字原稿である」と判定した場合か、あるいはまた
操作部１０９において「文字モード」が指定された場合
にのみ、実行する。However, the background color judgment processing described above can be applied to the case of a binary image such as a character, and when a multi-valued image such as a photograph is used, the highlight portion is not reproduced and it becomes white. I will end up. Therefore, the above-mentioned automatic back out mode is performed only when it is determined that "this is a character original" in the sampling at the time of pre-scanning, or when the "character mode" is specified in the operation unit 109. Run.
【００２４】（第４の実施例）文字のような２値画像と
写真のような多値画像が混在する原稿画像を複写する場
合には、文字部分の判定結果のみで“裏とばし”を行う
と、写真部分のハイライト画像が飛んでしまい、再現性
が悪くなる。よって、このような原稿で特に“裏とばし
モード”の指定がなく、裏うつりしていると判定された
場合には、原稿中の“文字”であると判定された領域だ
け“裏とばし”の処理を行う。なお、この判定は周知技
術であるので説明は省略する。(Fourth Embodiment) When copying an original image in which a binary image such as a character and a multivalued image such as a photograph coexist, "back-out" is performed only by the determination result of the character portion. Then, the highlight image in the photograph part is skipped, resulting in poor reproducibility. Therefore, if such a document does not have a "back-through mode" specified and it is determined that the document is back-printed, only the area of the document that is determined to be "text" is "back-printed". Perform processing. Since this determination is a well-known technique, its explanation is omitted.
【００２５】一方、使用者から“裏とばしモード”の指
定があった場合には、写真部分についても裏とばしを実
行する。On the other hand, when the user has designated the "back-side skip mode", the back-side skip is also executed for the photograph portion.
【００２６】図５に上記の処理を実行する本発明の第４
の実施例の回路構成を示す。文字／写真判定部４０１に
おいて、光量−濃度変換部１０３からの濃度信号を基に
原稿中の文字部分と写真部分の領域を判別する。ＯＲゲ
ート４０２で「裏とばしモード」信号１０５、「文字／
写真モード指定」信号４０３との論理和をとり、「裏う
つりモード」でも「文字／写真モードどちらかのモード
指定」でもなく、領域が写真であると判定されたときに
は、ＬＵＴ１０６における「裏とばし」がｏｆｆにな
る。FIG. 5 shows a fourth embodiment of the present invention which executes the above processing.
2 shows a circuit configuration of the embodiment. In the character / photo determination unit 401, the region of the character portion and the photograph portion in the document is determined based on the density signal from the light amount / density conversion unit 103. In the OR gate 402, the “outside mode” signal 105, “character /
If the area is determined to be a photograph, the logical sum of the “photo mode designation” signal 403 is used, and it is neither “back transition mode” nor “character / photo mode mode designation”. Turns off.
【００２７】本発明はカラー複写装置に限らず、画像処
理装置、例えば読取装置単体に適用しても同様の効果が
得られる。The present invention is not limited to a color copying apparatus, but the same effects can be obtained when applied to an image processing apparatus, for example, a reading apparatus alone.
【００２８】[0028]
【発明の効果】以上説明したように、本発明によれば、
原稿の裏面などが透過して複写されないように濃度補正
テーブルをとばして選択する裏とばしモードを設けたの
で、使用者の勘で濃度合わせをしたり、試しどりをした
りの手間をかけず、裏面透過のない見やすい複写物を自
動的に得ることができる。As described above, according to the present invention,
A back-side skip mode is provided to skip and select the density correction table so that the back side of the document is not transmitted and copied, so you do not have to adjust the density at the intuition of the user or make trial adjustments. It is possible to automatically obtain an easy-to-read copy without rear surface transmission.
【図１】従来例の濃度信号の補正処理の内容を示すグラ
フである。FIG. 1 is a graph showing the contents of correction processing of a density signal of a conventional example.
【図２】本発明の一実施例の回路構成を示すブロック図
である。FIG. 2 is a block diagram showing a circuit configuration of an embodiment of the present invention.
【図３】図２のＬＵＴの濃度補正テーブルの内容を示す
説明図である。FIG. 3 is an explanatory diagram showing contents of a density correction table of the LUT of FIG.
【図４】裏うつりのある単色文字原稿の濃度ヒストグラ
ムの一例を示すグラフである。FIG. 4 is a graph showing an example of a density histogram of a single-color character original having a backslipping.
【図５】本発明の他の実施例の回路構成を示すブロック
図である。FIG. 5 is a block diagram showing a circuit configuration of another embodiment of the present invention.
１０１ ＣＤＤイメージセンサ １０２ シェーディング補正回路 １０３ 光量−濃度変換部 １０４ 濃度検出回路 １０５ 裏とばしモード信号 １０５′ 文字／写真モード信号 １０６ ルックアップテーブル １０７ フィルタリング部 １０８ プリンタ １０９ 操作部 １１０ ＣＰＵ ４０１ 文字／写真判定部 ４０２ ＯＲゲート ４０３ 文字／写真モード指定信号 Reference Signs List 101 CDD image sensor 102 Shading correction circuit 103 Light amount-density conversion unit 104 Density detection circuit 105 Back-out mode signal 105 'Character / photo mode signal 106 Look-up table 107 Filtering unit 108 Printer 109 Operation unit 110 CPU 401 Character / photo determination unit 402 OR gate 403 Character / picture mode designation signal
Claims (6)
る画像読取手段と、 裏とばしモードを指定する指定手段と、 前記裏とばしモードの指定に応じて、原稿の裏面や重ね
た次頁の原稿が透過して複写されない濃度に、前記濃度
信号に対して濃度補正を行う濃度補正手段とを具備した
ことを特徴とする画像読取装置。1. An image reading unit for reading a document image and outputting a density signal, a designating unit for designating a back-side skip mode, and a back side of the document or a document on the next page overlapped according to the designation of the back-side spread mode. An image reading apparatus comprising: a density correction unit that corrects the density of the density signal to a density that does not allow transmission of light through the image to be copied.
ードを指定できることを特徴とする請求項１に記載の画
像読取装置。2. The image reading apparatus according to claim 1, wherein the designating unit allows a user to designate the back-through mode.
トグラムに基づいて自動的に裏うつり部分を判定し、該
判定に基づいて前記裏とばしモードを指定することを特
徴とする請求項１に記載の画像読取装置。3. The designating device according to claim 1, wherein the designating unit automatically determines a back-behind portion based on a density histogram of the density signal, and designates the back-through mode based on the determination. Image reading device.
裏うつり部分を地色とみなして前記濃度補正を行うこと
を特徴とする請求項３に記載の画像読取装置。4. The image reading apparatus according to claim 3, wherein the density correction unit performs the density correction by regarding the back-behind portion as a ground color based on the determination.
値画像領域に対してのみ前記濃度補正を行うことを特徴
とする請求項１〜４のいずれかに記載の画像読取装置。5. The character of the original or 2
The image reading apparatus according to claim 1, wherein the density correction is performed only on a value image area.
は、自動的に前記裏とばしモードを指定することを特徴
とする請求項１または５に記載の画像読取装置。6. The image reading apparatus according to claim 1, wherein the designation unit automatically designates the back-side skip mode in the double-sided copy mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16952492A JP3267681B2 (en) | 1992-06-26 | 1992-06-26 | Image processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16952492A JP3267681B2 (en) | 1992-06-26 | 1992-06-26 | Image processing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0614185A true JPH0614185A (en) | 1994-01-21 |
| JP3267681B2 JP3267681B2 (en) | 2002-03-18 |
Family
ID=15888104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16952492A Expired - Fee Related JP3267681B2 (en) | 1992-06-26 | 1992-06-26 | Image processing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3267681B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6873441B1 (en) | 1999-09-20 | 2005-03-29 | Kyocera Mita Corporation | Image processing device for correcting gradation of color image |
| US7006708B1 (en) | 1998-06-23 | 2006-02-28 | Sharp Kabushiki Kaisha | Image processor, image processing method, and medium on which image processing program is recorded |
| US7064863B2 (en) | 2000-05-08 | 2006-06-20 | Ricoh Company, Ltd. | Method and system for see-through image correction in image duplication |
| JP2015142226A (en) * | 2014-01-28 | 2015-08-03 | 株式会社Pfu | Image processing apparatus, image processing method and computer program |
-
1992
- 1992-06-26 JP JP16952492A patent/JP3267681B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7006708B1 (en) | 1998-06-23 | 2006-02-28 | Sharp Kabushiki Kaisha | Image processor, image processing method, and medium on which image processing program is recorded |
| US7158688B2 (en) | 1998-06-23 | 2007-01-02 | Sharp Kabushiki Kaisha | Image processing apparatus, image processing method, and medium on which image processing program is recorded |
| US7298927B2 (en) | 1998-06-23 | 2007-11-20 | Sharp Kabushiki Kaisha | Image processing apparatus, image processing method, and medium on which image processing program is recorded |
| US7327879B2 (en) | 1998-06-23 | 2008-02-05 | Sharp Kabushiki Kaisha | Image processing apparatus, image processing method, and medium on which image processing program is recorded |
| US6873441B1 (en) | 1999-09-20 | 2005-03-29 | Kyocera Mita Corporation | Image processing device for correcting gradation of color image |
| US7064863B2 (en) | 2000-05-08 | 2006-06-20 | Ricoh Company, Ltd. | Method and system for see-through image correction in image duplication |
| JP2015142226A (en) * | 2014-01-28 | 2015-08-03 | 株式会社Pfu | Image processing apparatus, image processing method and computer program |
| US9143653B2 (en) | 2014-01-28 | 2015-09-22 | Pfu Limited | Image processing apparatus, method, and computer program product identifying show-through position based on back side image and expanded front side image |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3267681B2 (en) | 2002-03-18 |
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