JPH04127774A - Picture reducing method - Google Patents

Picture reducing method

Info

Publication number
JPH04127774A
JPH04127774A JP2249372A JP24937290A JPH04127774A JP H04127774 A JPH04127774 A JP H04127774A JP 2249372 A JP2249372 A JP 2249372A JP 24937290 A JP24937290 A JP 24937290A JP H04127774 A JPH04127774 A JP H04127774A
Authority
JP
Japan
Prior art keywords
pixel
thinned out
pixels
scanning direction
value
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
JP2249372A
Other languages
Japanese (ja)
Inventor
Yoshihisa Takeuchi
竹内 祥久
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.)
Murata Machinery Ltd
Original Assignee
Murata Machinery 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 Murata Machinery Ltd filed Critical Murata Machinery Ltd
Priority to JP2249372A priority Critical patent/JPH04127774A/en
Publication of JPH04127774A publication Critical patent/JPH04127774A/en
Pending legal-status Critical Current

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  • Editing Of Facsimile Originals (AREA)
  • Image Processing (AREA)

Abstract

PURPOSE:To prevent the deterioration of picture quality by correcting a data near a picture element to be thinned out while considering the data of a picture element near the picture element to be thinned out. CONSTITUTION:Concerning a main scanning direction, when a picture element (q) is corresponding to the picture element to be thinned out among picture elements (p), (q) and (r) extracting the picture element in the main scanning direction of a picture, namely, one part of the picture in one line, the just following picture element (r) is corrected according to the picture element (q) to be thinned out, the picture element (p) just before the (q) and the picture element (r) just behind the (q). Concerning the sub scanning direction, when lines P, Q and R are adjacent lines and the line Q is a line to be thinned out, the picture element is thinned out by correcting the value of the picture element before or behind the picture element to be thinned out while considering the value of the picture element to be thinned out and the values of upper and lower picture elements continued to it. Thus, there is no deterioration of received picture quality in facsimile communication even when the picture element of the picture from the transmission side is thinned out.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、ファクシミリ等における画像の画素を間引い
て画像を縮小する画像縮小方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image reduction method for thinning out pixels of an image in a facsimile or the like to reduce the image.

(従来の技術) ファクシミリ通信において、送信側の原稿寸法に対して
、受信側の記録紙の寸法が小さいという場合がある。例
えば、送信側の原稿がB4サイズであり、受信側の記録
紙がA4サイズである場合がある。
(Prior Art) In facsimile communication, there are cases where the size of recording paper on the receiving side is smaller than the size of the document on the sending side. For example, the document on the sending side may be B4 size, and the recording paper on the receiving side may be A4 size.

この場合、送信側において、送信画像の画素を一定の割
合で間引いて縮小した画像を送信したり、あるいは、受
信側において、受信画像の画素を一定の割合で間引いて
縮小した画像を記録したりする方法が一般的である。
In this case, the transmitting side may thin out the pixels of the transmitted image at a certain rate and transmit a reduced image, or the receiving side may thin out the pixels of the received image at a certain rate and record the reduced image. The most common method is to

B4サイズの画像をA4サイズに縮小する場合を説明す
る。それぞれの主走査方向の画素数は、2048.17
28であるから、縮小すべき比率は、 A4/B4=1728/2048二27/32であり、
32画素中、5画素を間引けばよい。
A case will be described in which a B4 size image is reduced to A4 size. The number of pixels in each main scanning direction is 2048.17
28, the ratio to be reduced is A4/B4=1728/2048227/32,
It is sufficient to thin out 5 pixels out of 32 pixels.

その間引き方の一例は、第3図に示すように、32画素
を単位とし、最初の5画素のつぎの1画素、つぎの6画
素のつぎの1画素、っぎの5画素のつぎの1画素、つぎ
の6画素のつぎの1画素、つぎの5画素のつぎの1画素
の順に、合計5画素を間引くようにする。これにより、
主走査方向において、27732の縮小ができる。副走
査方向においても同様の方法で、32ライン中から5ラ
インを間引くことにより副走査方向にも同じ比率の縮小
ができ、B4の画像をA4の画像に縮小することができ
る。
An example of thinning is as shown in Figure 3, with 32 pixels as a unit, the next 1 pixel after the first 5 pixels, the next 1 pixel after the next 6 pixels, and the next 1 pixel after the next 5 pixels. , the next 1 pixel after the next 6 pixels, and the 1 pixel after the next 5 pixels, so that a total of 5 pixels are thinned out. This results in
In the main scanning direction, a reduction of 27732 is possible. In the sub-scanning direction as well, by thinning out 5 lines out of 32 lines, the same ratio of reduction can be achieved in the sub-scanning direction, and a B4 image can be reduced to an A4 image.

このような画素、または、ラインの間引きは、上述した
ような間引くべき画素、または、ラインを単純にそのま
ま間引くものであるから、重要な意味を持つ画素を間引
いてしまうこともあり、結果的に著しく画質が劣化して
しまうことがある。
This kind of pixel or line thinning simply thins out the pixels or lines that should be thinned out as described above, so pixels with important meanings may be thinned out, and as a result, Image quality may deteriorate significantly.

例えば、縦線が破線になったり、甚だしい場合は、消え
てしまうようなこともある。
For example, vertical lines may become broken lines, or in extreme cases, they may disappear.

(発明が解決しようとする課題) 本発明は、上述した事情に鑑みてなされたもので、間引
くべき画素の近傍の画素のデータを考慮して、間引く画
素の近傍のデータを補正することにより、画質の劣化を
防止できる画像縮小方法を提供することを目的とするも
のである。
(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and by correcting the data in the vicinity of the pixel to be thinned out, taking into consideration the data of the pixels in the vicinity of the pixel to be thinned out, The object of the present invention is to provide an image reduction method that can prevent deterioration of image quality.

(課題を解決する手段) 本発明は、第1発明においては、2値の画素データから
なる画像パターンを、主走査方向および副走査方向に、
所定の割合で画素を間引きすることにより、画像パター
ンを縮小する画像縮小方法において、主走査方向には、
間引かれる画素およびそれに連続する前および後の画素
の値を考慮して、間引かれる画素の前または後の画素の
値を決定して画素を間引き、副走査方向には、間引かれ
る画素およびそれに連続する上および下の画素の値を考
慮して、間引かれる画素の前または後の画素の値を補正
して画素を間引くことを特徴とするものであり、第2発
明においては、2値の画素データからなる画像パターン
を、主走査方向および副走査方向に、所定の割合で画素
を間引きすることにより、画像パターンを縮小する画像
縮小方法において、主走査方向には、間引かれる画素に
連続する直前および直後の画素の値が、間引かれる画素
の値と相違する場合は、直前または直後の画素の値を間
引かれる画素の値とするよう画素を間引き、副走査方向
には、間引かれる画素に連続する直上および直下の画素
の値が、間引かれる画素の値と相違する場合は、直上ま
たは直下の画素の値を間引かれる画素の値に補正して画
素を間引くことを特徴とするものであり、第3発明にお
いては、2値の画素データからなる画像パターンを、主
走査方向および副走査方向に、所定の割合で画素を間引
きすることにより、画像パターンを縮小する画像縮小方
法において、主走査方向には、間引かれる画素が黒であ
り、それに連続する直前および直後の画素の値が白であ
る場合は、直前または直後の画素を黒とするよう画素を
間引き、副走査方向には、間引かれる画素が黒であり、
それに連続する直上および直下の画素が白である場合は
、。
(Means for Solving the Problem) In the first aspect of the present invention, an image pattern consisting of binary pixel data is scanned in the main scanning direction and the sub-scanning direction.
In an image reduction method that reduces an image pattern by thinning out pixels at a predetermined ratio, in the main scanning direction,
The pixel is thinned out by determining the value of the pixel before or after the pixel to be thinned out, taking into account the values of the pixel to be thinned out and the values of the pixels before and after it, and in the sub-scanning direction, the pixel to be thinned out. The second invention is characterized in that the pixel is thinned out by correcting the value of the pixel before or after the pixel to be thinned out, taking into account the values of the pixels above and below the thinned out pixel. In an image reduction method that reduces an image pattern consisting of binary pixel data by thinning out pixels at a predetermined ratio in the main scanning direction and the sub-scanning direction, the image pattern is thinned out in the main scanning direction. If the value of the pixel immediately before and after the pixel that follows the pixel is different from the value of the pixel to be thinned out, the pixel is thinned out so that the value of the pixel immediately before or after the pixel to be thinned out is the value of the pixel to be thinned out, and the pixel is thinned out in the sub-scanning direction. If the values of the pixels immediately above and directly below the pixel to be thinned out are different from the value of the pixel to be thinned out, the value of the pixel immediately above or directly below is corrected to the value of the pixel to be thinned out, and the pixel is changed. In the third invention, the image pattern is thinned out by thinning out the pixels of the image pattern consisting of binary pixel data in the main scanning direction and the sub-scanning direction at a predetermined ratio. In the image reduction method, if the pixel to be thinned out is black in the main scanning direction, and the value of the pixel immediately before and after it is white, the pixel is set so that the pixel immediately before or after it is black. In the sub-scanning direction, the pixels to be thinned out are black,
If the pixels directly above and directly below it are white.

直上または直下の画素の値を黒として画素を間引くこと
を特徴とするものである。
This method is characterized by thinning out pixels by setting the value of the pixel directly above or below to black.

(実施例) 第1図は、本発明の画像縮小方法の一実施例の説明図で
ある。同図(A)は、画像の主走査方向の画素、すなわ
ち、1ラインの画像の一部を取り出した画素p+Q+r
’を示すもので、第3図で説明したところにより、画素
qが間引かれる画素に該当したものとして説明する。こ
の実施例は、間引かれる画素qとその直前の画素pと直
後の画素rとにより、直後の画素rを補正する方法であ
る。
(Embodiment) FIG. 1 is an explanatory diagram of an embodiment of the image reduction method of the present invention. The same figure (A) shows the pixels in the main scanning direction of the image, that is, the pixels p+Q+r taken out from a part of the image of one line.
', and will be described assuming that pixel q corresponds to the pixel to be thinned out as described in FIG. This embodiment is a method of correcting the immediately following pixel r using the pixel q to be thinned out, the pixel p immediately before it, and the pixel r immediately after it.

補正方法は、間引かれる画素qが黒である場合、その直
前の画素pと直後の画素rとがともに白であれば、直後
の画素rを黒に置換する。その他の場合は、単に画素q
を間引くようにする。同図(A)における画素qを間引
いた結果が同図(B)である。画素pはそのままであり
、画素qが間弓かれ、画素rは、白データが黒データに
補正されて、同図(B)の縮小画像が得られる。
In the correction method, when the pixel q to be thinned out is black, and the pixel p immediately before it and the pixel r immediately after it are both white, the pixel r immediately after it is replaced with black. In other cases, simply pixel q
Try to thin out. The result of thinning out the pixel q in the figure (A) is shown in the figure (B). The pixel p remains as is, the pixel q is spaced out, and the white data of the pixel r is corrected to black data, resulting in the reduced image shown in FIG. 4B.

このように、画素rを補正することにより、画素qの位
置において、上下に連続する縦線があっても、これを画
素rの位置に再現できるので、この縦線が間引きにより
消去されることを防止できる。また、画素qの位置のみ
に存在する点の場合も、その脱落を防止できる。
In this way, by correcting pixel r, even if there is a continuous vertical line above and below at the position of pixel q, this can be reproduced at the position of pixel r, so that this vertical line can be eliminated by thinning out. can be prevented. Furthermore, even in the case of a point existing only at the position of pixel q, it is possible to prevent the point from falling off.

このような補正を論理式に基づいて行なうことができる
Such correction can be performed based on logical expressions.

同図(C)は、論理式の一例の説明図である。FIG. 2C is an explanatory diagram of an example of a logical formula.

図中、p、q、rは、1または0の値であり、1は黒、
0は白を示す。式中の横に引いた線は、否定を意味する
。画素pはそのままの値が間引き後も引き継がれるから
、p=pである。画素rは、pyqzrの値に基づいて
演算され、第1図(A)(B)で説明した補正値となる
In the figure, p, q, r are values of 1 or 0, 1 is black,
0 indicates white. A horizontal line in the formula means negation. Since the value of pixel p is carried over even after thinning, p=p. The pixel r is calculated based on the value of pyqzr, and becomes the correction value explained in FIGS. 1(A) and 1(B).

なお、補正を論理式で行なう場合の式は、これに限られ
るものではなく、適宜の式を用いることができる。補正
方法も、第1図(A)、(B)で説明した方法に限られ
るものではない。補正のために考慮する画素も、直前の
画素と直後の画素だけでなく、より広い範囲の画素を考
慮してもよい。
Note that when the correction is performed using a logical formula, the formula is not limited to this, and any appropriate formula can be used. The correction method is also not limited to the method described in FIGS. 1(A) and 1(B). Pixels to be considered for correction are not only the immediately preceding pixel and the immediately following pixel, but also a wider range of pixels may be considered.

補正される画素も、直後の画素に限られるものではなく
、直前の画素を補正してもよい。
The pixel to be corrected is not limited to the immediately following pixel, and the immediately preceding pixel may also be corrected.

第1図(A)、(B)で説明した補正は、白地に黒の文
字や線がある場合を対象にしたが、黒地に白の文字や線
がある場合をも対象にすると、3つの画素で補正をする
場合は、間引かれる画素に連続する直前および直後の画
素の値が、間引かれる画素の値と相違する場合に、直前
または直後の画素の値を間引かれる画素の値に補正する
ようにしてもよい。
The correction explained in Figures 1 (A) and (B) was applied to cases where there are black characters or lines on a white background, but if it is also applied to cases where there are white characters or lines on a black background, three things can be done. When performing correction by pixel, if the value of the pixel immediately before and after the pixel to be thinned out is different from the value of the pixel to be thinned out, the value of the pixel immediately before or after the pixel to be thinned out is changed to the value of the pixel to be thinned out. It may be corrected to

副走査方向についても、上で説明したと同様にして補正
をすることができる。第2図は、その−例の説明図であ
る。同図(A)において、P、Q。
Correction can also be made in the sub-scanning direction in the same manner as described above. FIG. 2 is an explanatory diagram of an example thereof. In the same figure (A), P, Q.

Rは隣接するラインである。各ラインの一部の画素p+
 q+ rs S+ j+ uのみが図示されている。
R is an adjacent line. Some pixels p+ of each line
Only q+ rs S+ j+ u is illustrated.

ラインQが間引かれるラインであり、その上下の画素を
考慮して第1図(A)、(B)で説明した方法により間
引いた結果が、同図(B)である。
Line Q is the line to be thinned out, and FIG. 1B shows the result of thinning out using the method described in FIGS. 1A and 1B, taking into account the pixels above and below it.

ラインQにおける各画素について、第1図(C)で説明
した論理式を適用してもよい。
The logical formula explained in FIG. 1(C) may be applied to each pixel in line Q.

副走査方向におけるラインの間引きの際の補正も、上述
した主走査方向の画素を間引く場合の補正と同様に、直
上および直下のラインだけに限らず、より多くのライン
の画素データを考慮してもよい。また、補正方法も、こ
こで説明した実施例に限られるものではない。
The correction when thinning out lines in the sub-scanning direction is similar to the correction when thinning out pixels in the main scanning direction mentioned above, and is not limited to only the lines directly above and below, but also takes into consideration the pixel data of many more lines. Good too. Further, the correction method is not limited to the embodiment described here.

主走査方向と副走査方向の間引きは、いずれを先に行な
ってもよい。また、その一方の間引きを終了してから他
方の間引きを行なうようにしてもよいし、補正に必要な
ラインについて、一方の間引きが終了したら他方の間引
きを行なうようにし、それを繰り返すようにしてもよい
The thinning in the main scanning direction or the sub-scanning direction may be performed first. Alternatively, the thinning of one of the lines may be completed before thinning of the other, or the line necessary for correction may be thinned after one of the lines has been thinned, and then the other line may be thinned, and this process may be repeated. Good too.

本発明の間引き動作は、ラインメモリと論理回路により
行なわれ、送信側、受信側いずれに設けてもよいが、画
面縮小をするようなケースは受信側が簡易なシステムで
ある場合が多いので定倍側でおこなうのが適切である。
The thinning operation of the present invention is performed by a line memory and a logic circuit, and may be provided on either the transmitting side or the receiving side, but in cases where the screen is to be reduced, the receiving side is often a simple system, so it is necessary to use constant multiplication. It is appropriate to do this on your side.

(発明の効果) 以上の説明から明らかなように、本発明によれば、ファ
クシミリ通信で、送信側からの画像画素を間引いても受
信画質の劣化は少なく、その効果は犬である。
(Effects of the Invention) As is clear from the above description, according to the present invention, in facsimile communication, even if image pixels from the transmitting side are thinned out, there is little deterioration in received image quality, and the effect is excellent.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、主走査方向の画素の間引き方法の説明図、第
2図は、副走査方向のラインの間引き方法の説明図、第
3図は、従来の画像縮小方法の説明図である。 p+ Qs r 、Sl t、u・・・画素P、Q、R
・・・ライン 特許出願人  村田機械株式会社
FIG. 1 is an explanatory diagram of a pixel thinning method in the main scanning direction, FIG. 2 is an explanatory diagram of a line thinning method in the sub-scanning direction, and FIG. 3 is an explanatory diagram of a conventional image reduction method. p+ Qs r , Sl t, u... pixels P, Q, R
...Line patent applicant Murata Machinery Co., Ltd.

Claims (3)

【特許請求の範囲】[Claims] (1)2値の画素データからなる画像パターンを、主走
査方向および副走査方向に、所定の割合で画素を間引き
することにより、画像パターンを縮小する画像縮小方法
において、主走査方向には、間引かれる画素およびそれ
に連続する前および後の画素の値を考慮して、間引かれ
る画素の前または後の画素の値を決定して画素を間引き
、副走査方向には、間引かれる画素およびそれに連続す
る上および下の画素の値を考慮して、間引かれる画素の
上または下の画素の値を補正して画素を間引くことを特
徴とする画像縮小方法。
(1) In an image reduction method that reduces an image pattern consisting of binary pixel data by thinning out pixels at a predetermined ratio in the main scanning direction and the sub-scanning direction, in the main scanning direction: The pixel is thinned out by determining the value of the pixel before or after the pixel to be thinned out, taking into account the values of the pixel to be thinned out and the values of the pixels before and after it, and in the sub-scanning direction, the pixel to be thinned out. An image reduction method characterized in that the pixels are thinned out by correcting the values of the pixels above or below the pixel to be thinned out, taking into account the values of the pixels above and below the pixel that are continuous to the thinned out pixel.
(2)2値の画素データからなる画像パターンを、主走
査方向および副走査方向に、所定の割合で画素を間引き
することにより、画像パターンを縮小する画像縮小方法
において、主走査方向には、間引かれる画素に連続する
直前および直後の画素の値が、間引かれる画素の値と相
違する場合は、直前または直後の画素の値を間引かれる
画素の値とするよう画素を間引き、副走査方向には、間
引かれる画素に連続する直上および直下の画素の値が、
間引かれる画素の値と相違する場合は、直上または直下
の画素の値を間引かれる画素の値に補正して画素を間引
くことを特徴とする画像縮小方法。
(2) In an image reduction method that reduces an image pattern consisting of binary pixel data by thinning out pixels at a predetermined ratio in the main scanning direction and the sub-scanning direction, in the main scanning direction: If the value of the pixel immediately before and after the pixel to be thinned out is different from the value of the pixel to be thinned out, the pixel is thinned out and subdivided so that the value of the pixel immediately before or after the pixel to be thinned out is the value of the pixel to be thinned out. In the scanning direction, the values of the pixels directly above and directly below the pixel to be thinned out are
An image reduction method characterized in that, if the value of the pixel to be thinned out is different from the value of the pixel to be thinned out, the value of the pixel directly above or below is corrected to the value of the pixel to be thinned out, and the pixel is thinned out.
(3)2値の画素データからなる画像パターンを、主走
査方向および副走査方向に、所定の割合で画素を間引き
することにより、画像パターンを縮小する画像縮小方法
において、主走査方向には、間引かれる画素が黒であり
、それに連続する直前および直後の画素の値が白である
場合は、直前または直後の画素を黒とするよう画素を間
引き、副走査方向には、間引かれる画素が黒であり、そ
れに連続する直上および直下の画素が白である場合は、
直上または直下の画素の値を黒として画素を間引くこと
を特徴とする画像縮小方法。
(3) In an image reduction method that reduces an image pattern consisting of binary pixel data by thinning out pixels at a predetermined ratio in the main scanning direction and the sub-scanning direction, in the main scanning direction: If the pixel to be thinned out is black, and the values of the pixels immediately before and after it are white, the pixels are thinned out so that the pixel immediately before or after it is black, and in the sub-scanning direction, the pixel to be thinned out is If is black, and the pixels immediately above and below it are white, then
An image reduction method characterized by thinning out pixels by setting the value of the pixel directly above or below to black.
JP2249372A 1990-09-19 1990-09-19 Picture reducing method Pending JPH04127774A (en)

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Application Number Priority Date Filing Date Title
JP2249372A JPH04127774A (en) 1990-09-19 1990-09-19 Picture reducing method

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Application Number Priority Date Filing Date Title
JP2249372A JPH04127774A (en) 1990-09-19 1990-09-19 Picture reducing method

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JPH04127774A true JPH04127774A (en) 1992-04-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000057631A1 (en) * 1999-03-24 2000-09-28 Matsushita Electric Industrial Co., Ltd. Image processing device and processing method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5799084A (en) * 1980-12-12 1982-06-19 Ricoh Co Ltd Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver
JPS58200660A (en) * 1982-05-18 1983-11-22 Nippon Telegr & Teleph Corp <Ntt> Conversion system of picture element density
JPS6098762A (en) * 1983-11-04 1985-06-01 Nec Corp Interleaving and shrinking circuit of facsimile equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5799084A (en) * 1980-12-12 1982-06-19 Ricoh Co Ltd Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver
JPS58200660A (en) * 1982-05-18 1983-11-22 Nippon Telegr & Teleph Corp <Ntt> Conversion system of picture element density
JPS6098762A (en) * 1983-11-04 1985-06-01 Nec Corp Interleaving and shrinking circuit of facsimile equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000057631A1 (en) * 1999-03-24 2000-09-28 Matsushita Electric Industrial Co., Ltd. Image processing device and processing method
EP1083736A1 (en) * 1999-03-24 2001-03-14 Matsushita Electric Industrial Co., Ltd. Image processing device and processing method
US6775418B1 (en) 1999-03-24 2004-08-10 Matsushita Electric Industrial Co., Ltd. Image processing device and processing method
EP1083736A4 (en) * 1999-03-24 2006-11-02 Matsushita Electric Ind Co Ltd Image processing device and processing method

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