JPS6382062A - Facsimile coding system - Google Patents

Facsimile coding system

Info

Publication number
JPS6382062A
JPS6382062A JP61225814A JP22581486A JPS6382062A JP S6382062 A JPS6382062 A JP S6382062A JP 61225814 A JP61225814 A JP 61225814A JP 22581486 A JP22581486 A JP 22581486A JP S6382062 A JPS6382062 A JP S6382062A
Authority
JP
Japan
Prior art keywords
image information
line
encoded
scanning line
threshold 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
JP61225814A
Other languages
Japanese (ja)
Inventor
Tetsuji Matsuo
哲司 松尾
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP61225814A priority Critical patent/JPS6382062A/en
Publication of JPS6382062A publication Critical patent/JPS6382062A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To improve transmission efficiency by detecting whether or not image information on a coding line is approximate to image information on a last line, and sending a signal which does not contain the image information on the coding line when it is judged that the image information is approximate. CONSTITUTION:A threshold value A is set so as to judge that the information on the coding line is the same as the image information on the last line when the number of different bits between the image information on the coding line and the image information on a last line in upper/lower relation is smaller than the value. The image information on the coding line is compared with the image information on the last line to detect the number of different bits of the image information and the value 'B' is compared with 'A'. When the threshold value 'B' is larger than the threshold value 'A', it is judged that the image information on the coding line is different from image information on the last line, and normal encoding operation is performed. When the value 'B' is smaller than the threshold value 'A', it is judged that the image information on the coding line is the same as the image information on the last line, and this encoding system is employed to add only a synchronizing code EOL without sending the image information and move to the next coding line.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明は、ファクシミリ通信の通信時間を短縮するため
の符号化方式lこ間するものである。
DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention provides an encoding method for shortening the communication time of facsimile communication.

(従来の技術) 従来、ファクシミリ信号(両信号)の符号化には、モデ
ィファイドハフマン方式とモディファイドリード方式が
主に使用されており、これら方式は一次元符号化と二次
元符号化とから成っている。
(Prior art) Conventionally, the modified Huffman method and modified read method have been mainly used to encode facsimile signals (both signals), and these methods consist of one-dimensional encoding and two-dimensional encoding. There is.

一次元符号化では、ランレングス符号を使用しており、
第4図のように白又は黒のデータの連続数を符号化して
いる。つまり、前副走査ライン(前ライン)の画情報が
全く同じであっても、独立して符号化するものである。
One-dimensional encoding uses run-length codes,
As shown in FIG. 4, the number of consecutive pieces of white or black data is encoded. In other words, even if the image information of the previous sub-scanning line (previous line) is exactly the same, it is encoded independently.

二次元符号化では、第5図のように現副走査ライン(符
号化ライン)の変化画素(その“色”すなわち男か白が
同一走査線上の直前の画素の色と異なる画素)と、前ラ
インの変化画素との位置関係を符号化するものである。
In two-dimensional encoding, as shown in Figure 5, changing pixels (pixels whose "color", i.e., male or white, is different from the color of the previous pixel on the same scanning line) of the current sub-scanning line (encoding line), This encodes the positional relationship between the line and the changing pixel.

つまり、どちらの符号化方式でありても、符号化ライン
の画情報が前ラインの画情報と全く同じ場合であっても
、ある穆度の情報量を有するものである。
In other words, regardless of which encoding method is used, even if the image information of the encoded line is exactly the same as the image information of the previous line, the amount of information has a certain degree of clarity.

(発明が解決しようとする問題点) このような従来のモディファイドハフマン方式及びモデ
ィファイドリード方式とも、符号化ラインの画情報が前
ラインの画情報と同じであっても、符号化された画情報
を送る必要があり、伝送効率が劣化、つまり伝送時間が
長くなってしまった。そこで、この発明は、上記欠点を
除去し、符号化ラインの画情報が前ラインの画情報と近
似している時は、符号化ラインの画情報を送出しないこ
とにより、伝送効率のよい符号化方式を提供することを
目的とする。
(Problems to be Solved by the Invention) In both the conventional modified Huffman method and modified read method, even if the image information of the encoded line is the same as the image information of the previous line, the encoded image information cannot be used. The transmission efficiency deteriorated, meaning the transmission time became longer. Therefore, the present invention eliminates the above-mentioned drawbacks and performs encoding with high transmission efficiency by not transmitting the image information of the encoded line when the image information of the encoded line is similar to the image information of the previous line. The purpose is to provide a method.

〔発明の構成〕[Structure of the invention]

(問題点を解決するための手段) この発明では、符号化ラインの画情報が前ラインの画情
報と近似しているか否かを検出する手段と、近似してい
ると判断した場合符号化ラインの画情報を含まぬ信号を
送出する手段とを備えている。
(Means for Solving the Problems) In the present invention, there is provided a means for detecting whether or not the image information of the encoded line is similar to the image information of the previous line, and a means for detecting whether or not the image information of the encoded line is similar to the image information of the previous line, and and means for transmitting a signal that does not include image information.

(作用) このような構成であるため、本発明では、前ラインと近
似している符号化ラインの画情報が伝送されることがな
いので、伝送効率を向上させることができる。
(Function) With such a configuration, in the present invention, image information of a coded line that is similar to the previous line is not transmitted, so that transmission efficiency can be improved.

(実施例) 第1図は、本発明の詳細な説明するための図であり、従
来方式と本実施例の方式とを対比したものである。従来
方式では、同期符号と同期符号の間には必ず、符号化さ
れた画信号(データ)があった。本実施例でも■のよう
に最初の画情報は符号化された画信号(データ)として
同期符号の間に送られる。しかし、次のラインの画情報
が前のラインの画情報と同じである場合には、■、■に
示すように画信号(データ)に何も送られない。
(Example) FIG. 1 is a diagram for explaining the present invention in detail, and compares the conventional system and the system of this example. In the conventional system, there was always a coded image signal (data) between the synchronization codes. In this embodiment as well, the first image information is sent as an encoded image signal (data) between synchronization codes, as shown in (3). However, if the image information of the next line is the same as the image information of the previous line, nothing is sent to the image signal (data) as shown in (1) and (2).

次に第4図のフローチャートを参照して、本実施例の特
徴的動作を説明する。
Next, the characteristic operation of this embodiment will be explained with reference to the flowchart of FIG.

人は、符号化ラインの画情報と上下の関係にある前ライ
ンの画情報の異なるビット数(第3図参照)がこの値以
下のとき、符号化ラインの画情報が前ラインの画情報と
同じであると判断するためのしきい値である。
When the number of different bits (see Figure 3) of the image information of the previous line, which is vertically related to the image information of the encoded line, is less than this value, the image information of the encoded line is different from the image information of the previous line. This is the threshold for determining that they are the same.

Bは、実際に符号化ラインと上下の関係にある前ライン
の画情報の異なるビット数を検出した値である。
B is a value obtained by detecting a different number of bits in the image information of the previous line that is actually above and below the encoded line.

符号化の手順としては、「A」の設定があるかどうか判
断する(ステップOf)。l’−AJの設定がまだない
ならば、ここで設定する(ステップ02)。
In the encoding procedure, it is determined whether "A" is set (step Of). If l'-AJ has not yet been set, set it now (step 02).

符号化ラインの画情報と前ラインの画情報を比べ、その
違いrBJとrAJとを比較する(ステップ03)。
The image information of the encoded line and the image information of the previous line are compared, and the differences rBJ and rAJ are compared (step 03).

「人」のしきい値よりもrBJの値のほうが大きければ
、符号化ラインの画情報と前ラインの画情報は違うもの
であると判断し、通常の符号化を行なう(ステップ04
)。
If the value of rBJ is larger than the threshold value for "person", it is determined that the image information of the encoded line and the image information of the previous line are different, and normal encoding is performed (step 04).
).

rBJの値が、しきい値rAJ以下の時、符号化ライン
の画情報は、前ラインの画情報と同じものであると判断
し、本符号化方式により、画情報は必らず、同期符号だ
けを付加する(ステップ05)。符号化ラインを次のラ
インへうつす(ステップ06)。
When the value of rBJ is less than or equal to the threshold value rAJ, it is determined that the image information of the encoded line is the same as the image information of the previous line, and with this encoding method, the image information is not necessarily the synchronization code. (Step 05). Transfer the encoded line to the next line (step 06).

このようにして、前ラインと同じ画情報を持つ符号化ラ
インの画情報(しきい値により、同じ画情報であると判
断されたものも含む)は、送らないで済むため、伝送効
率が良くなる。
In this way, the image information of the encoded line that has the same image information as the previous line (including information determined to be the same image information by the threshold) does not need to be sent, improving transmission efficiency. Become.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、前ラインと近似
している符号化ライン(現ライン)の符号化画信号に、
画情報が含まれないので、伝送時間の短縮、つまり伝送
効率の向上が図られる。
As explained above, according to the present invention, in the encoded image signal of the encoded line (current line) that is similar to the previous line,
Since no image information is included, the transmission time can be shortened, that is, the transmission efficiency can be improved.

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

第1図は、本発明の一実施例を説明するための図、第2
図は、本発明の一実施例の動作を説明するためのフロー
チャート、第3図は、符号化うインの画情報と前ライン
の画情報との異なるビットを説明するための図、第4図
及び第5図は、従来の符号化方式による符号化を説明す
るための図である。 EOL・・・同期符号
FIG. 1 is a diagram for explaining one embodiment of the present invention, and FIG.
3 is a flowchart for explaining the operation of an embodiment of the present invention, FIG. 3 is a diagram for explaining the different bits between the image information of the incoming encoded line and the image information of the previous line, and FIG. and FIG. 5 are diagrams for explaining encoding using a conventional encoding method. EOL...Synchronization code

Claims (2)

【特許請求の範囲】[Claims] (1)読取り得られた生の画信号を副走査ライン毎に符
号化した後、符号化画信号に同期符号を付して各副走査
ライン毎の符号化信号を得るファクシミリ符号化方式に
おいて、現副走査ラインと前副走査ラインとに対応する
画信号の近似度を検出する判別手段と、この判別手段に
て近似と判別された場合、現副走査ラインに対応する符
号化信号を符号化画信号を含まぬ符号化信号とする手段
とを備えたファクシミリ符号化方式。
(1) In a facsimile encoding method, the read raw image signal is encoded for each sub-scanning line, and then a synchronization code is attached to the encoded image signal to obtain an encoded signal for each sub-scanning line. a determining means for detecting the degree of similarity between the image signals corresponding to the current sub-scanning line and the previous sub-scanning line; and when the determining means determines that the image signals are similar, the encoded signal corresponding to the current sub-scanning line is encoded; A facsimile encoding method comprising means for generating an encoded signal that does not include an image signal.
(2)判別手段は、所定のしきい値が設定され、現副走
査ラインに対応する画信号と、前副走査ラインに対応す
る画信号とをビット単位で比較し、両画信号間の異なる
ビット数を検出し、このビット数と前記しきい値との比
較値に基づき現副走査ラインに対応する画信号の近似度
を検出する手段であることを特徴とする特許請求の範囲
第(1)項記載のファクシミリ符号化方式。
(2) The determination means has a predetermined threshold value set, and compares the image signal corresponding to the current sub-scanning line and the image signal corresponding to the previous sub-scanning line bit by bit, and Claim 1 is characterized in that it is means for detecting the number of bits and detecting the degree of approximation of the image signal corresponding to the current sub-scanning line based on a comparison value between the number of bits and the threshold value. ) The facsimile encoding method described in the section.
JP61225814A 1986-09-26 1986-09-26 Facsimile coding system Pending JPS6382062A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61225814A JPS6382062A (en) 1986-09-26 1986-09-26 Facsimile coding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61225814A JPS6382062A (en) 1986-09-26 1986-09-26 Facsimile coding system

Publications (1)

Publication Number Publication Date
JPS6382062A true JPS6382062A (en) 1988-04-12

Family

ID=16835212

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61225814A Pending JPS6382062A (en) 1986-09-26 1986-09-26 Facsimile coding system

Country Status (1)

Country Link
JP (1) JPS6382062A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5915364A (en) * 1996-05-30 1999-06-29 Denso Corporation Canister for use in evaporative emission control system for automotive vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5915364A (en) * 1996-05-30 1999-06-29 Denso Corporation Canister for use in evaporative emission control system for automotive vehicle

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