JPS60134665A - Facsimile equipment - Google Patents
Facsimile equipmentInfo
- Publication number
- JPS60134665A JPS60134665A JP24976683A JP24976683A JPS60134665A JP S60134665 A JPS60134665 A JP S60134665A JP 24976683 A JP24976683 A JP 24976683A JP 24976683 A JP24976683 A JP 24976683A JP S60134665 A JPS60134665 A JP S60134665A
- Authority
- JP
- Japan
- Prior art keywords
- line
- signals
- circuit
- section
- image signal
- 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
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、ファクシミリ装置に関し、特に垂直解像度
自動切換を行なったものに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a facsimile machine, and particularly to one that performs automatic vertical resolution switching.
従来、この種の装置において垂直解像度自動切換をする
場合は、lラインの黒画素、白画素の変化点数を計数し
、該変化点数が所定数より少ないラインについては垂直
解像度を粗くして画信号を読み取っていた。Conventionally, when performing automatic vertical resolution switching in this type of device, the number of changing points of black pixels and white pixels of one line is counted, and for lines where the number of changing points is less than a predetermined number, the vertical resolution is coarsened and the image signal is changed. was reading.
即ち、従来の画信号読取り装置においては、−走査ライ
ン内の画信号の黒画素、白画素の変化点数を計数し、当
該変化点数が所定値以下であれば単純なパターンの書画
であると判断して副走査のピンチを粗くし、次のライン
を読み取る。そしてこの副走査ピッチを粗くしたライン
の信号を伝送する場合は、副走査ピッチが変化したこと
を判別できる特殊なライン同期信号を符号化し、これを
該ラインの画信号とともに受信側へ伝送するようにして
いた。That is, in a conventional image signal reading device, - the number of change points of black pixels and white pixels of the image signal in a scanning line is counted, and if the number of change points is less than a predetermined value, it is determined that the calligraphy is a simple pattern. to coarsen the sub-scanning pinch and read the next line. When transmitting a line signal with a coarser sub-scanning pitch, a special line synchronization signal that can identify that the sub-scanning pitch has changed is encoded and transmitted to the receiving side together with the image signal of the line. I was doing it.
従来のファクシミリ装置は以上のように構成されており
、1ラインの走査線全体での白黒画素の変化点数を針数
することにより副走査のピンチを粗くして伝送時間の短
縮を図っているが、書画中に部分的に細かなパターンが
ある場合にはそれを十分判定できずに副走査ピンチを粗
(してしまうことがあり、又、副走査ピッチを粗くした
場合、当該ラインを通常ピッチのラインと識別できるよ
うにライン同期信号を複数用意する必要があった。Conventional facsimile machines are configured as described above, and by calculating the number of changing points of black and white pixels in the entire scanning line of one line, the pinch of the sub-scanning is made coarser and the transmission time is shortened. If there is a partially fine pattern in the calligraphy or drawing, it may not be possible to judge it sufficiently and the sub-scanning pinch may be applied coarsely.Also, if the sub-scanning pitch is made coarse, the line may be changed to the normal pitch. It was necessary to prepare multiple line synchronization signals so that the lines could be identified.
本発明は、上記のような従来のものの欠点を除去するた
めになされたもので、各走査ラインを一定長のブロック
に分割し、各ブロック毎の白、黒画素の変化点の数を計
数し、当該変化点数が所定値以下となる区間については
読取ったラインの画信号に代えて該走査ラインの直前の
走査ラインの当該区間の画信号をラインメモリから読出
し、このような画信号に対して2次元帯域圧縮を行なう
ことにより、副走査ピッチを変化させることなく符号発
生ビットを減少でき、圧縮効率を上げることのできるフ
ァクシミリ装置を提供することを目的としている。The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional method. Each scanning line is divided into blocks of a fixed length, and the number of changing points of white and black pixels for each block is counted. , for the section where the number of change points is less than a predetermined value, the image signal of the section of the scanning line immediately before the scanning line is read out from the line memory instead of the image signal of the read line, and It is an object of the present invention to provide a facsimile apparatus which can reduce code generation bits without changing the sub-scanning pitch and improve compression efficiency by performing two-dimensional band compression.
以下、この発明の一実施例を図について説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第1図は本発明の一実施例によるファクシミリ装置を示
し、図において、8は原稿面を走査し書画の情報を読取
る読取回路としての光電変換回路、3.4はそれぞれ1
ライン分の画信号を記憶しうるラインメモリ、1は走査
ラインを一定長の区間に分割し各区間に含まれる画素の
変化点の個数を計数する変化点□計数回路、10はライ
ンメモリ3゜4の読出し回路で、これは変化点数が所定
値を上回る区間については現走査ラインの両信号を記憶
している方のラインメモリから該当する区間の画信号を
読出し、変化点数が所定値を下回る区間についてはその
直前ラインの画信号を記憶している他方のラインメモリ
から当該区間の信号を読出すものである。該続出し回路
10において、2は変化点数メモリ、7は書込み読出し
タイミング切換回路、6はn分周回路、5は分割された
各ブロック毎に2つのラインメモリ3.4のいずれか一
方の画信号を読出すための切換回路である。FIG. 1 shows a facsimile apparatus according to an embodiment of the present invention. In the figure, 8 is a photoelectric conversion circuit as a reading circuit that scans the surface of a document and reads information on calligraphic strokes, and 3 and 4 are 1, respectively.
A line memory capable of storing a line's worth of image signals; 1 is a change point counter circuit that divides a scanning line into sections of a fixed length and counts the number of change points of pixels included in each section; 10 is a line memory 3゜4 readout circuit reads out the image signal of the corresponding section from the line memory that stores both signals of the current scanning line for the section where the number of change points exceeds a predetermined value, and reads out the image signal of the corresponding section when the number of change points falls below the predetermined value. Regarding a section, the signal of the section is read out from the other line memory which stores the image signal of the immediately preceding line. In the continuation circuit 10, 2 is a change point number memory, 7 is a write/read timing switching circuit, 6 is an n frequency divider circuit, and 5 is a memory for one of two line memories 3.4 for each divided block. This is a switching circuit for reading out signals.
次に動作について説明する。Next, the operation will be explained.
スイッチ20は図示しない駆動回路により駆動され、光
電変換回路8からの画信号をライン毎にラインメモリ3
.4に交互に入力する。書込み読出しタイミング切換回
路7が発生したメモリ書込みパルスa (第2図+a)
参照)は分周回路6によりn分周され、1ラインをn分
割したところのタイミング信号b(第2図(bl参照)
を作り出している。The switch 20 is driven by a drive circuit (not shown) and transfers the image signal from the photoelectric conversion circuit 8 to the line memory 3 line by line.
.. 4 alternately. Memory write pulse a generated by the write/read timing switching circuit 7 (Figure 2+a)
) is frequency-divided by n by the frequency dividing circuit 6, and the timing signal b (see Fig. 2 (bl)) is obtained by dividing one line by n.
is creating.
いま、第2図(0)に示す期間twにおいて、現走査ラ
インの直前のラインの画信号がメモリ4に既に記憶され
ており、現ラインの画信号C(同図(C1参照)が光電
変換回路8よりラインメモリ3に入力されているとする
。Now, in the period tw shown in FIG. 2 (0), the image signal of the line immediately before the current scanning line has already been stored in the memory 4, and the image signal C of the current line (see FIG. 2 (see C1) is photoelectrically converted. Assume that the signal is input from the circuit 8 to the line memory 3.
この期間twにおいて、現ラインの画信号の白黒の変化
点の数が変化点計数回路1によりブロック毎に計数され
、その計数結果が一定値より多い場合をロジックレベル
11″とし、少ない場合をロジックレベル1lO1lと
して、各ロジックレベルが変化点数メモリ2に記憶され
る。従って一走査ラインの書込みが終了した時点では、
変化点数メモリ2には各ブロックの画信号の複雑さを示
す情報として、白黒画素の変化点数がある値より多いか
否かが記憶されていることとなる。During this period tw, the number of black and white changing points of the image signal of the current line is counted for each block by the changing point counting circuit 1, and when the counting result is greater than a certain value, it is set as a logic level 11'', and when it is smaller, it is set as a logic level. Each logic level is stored as level 1lO1l in the change point number memory 2. Therefore, when writing of one scanning line is completed,
The change point number memory 2 stores whether the number of change points of black and white pixels is greater than a certain value as information indicating the complexity of the image signal of each block.
次に第2図TC)の期間trにおいてラインメモリ3に
書込まれた現ラインの4画信号を読み出す場合、画信号
の読出しに先行して先ず変化点数メモリ2の内容が読出
され、それが1″の場合は該ブロックは複雑な書画とし
て、切換回路5を介してラインメモリ3のデータがその
1ブロック間、帯域圧縮回路9に出力される。また変化
点数メモリ2のデータがθ″の場合はパターンの簡単な
書画として切換回路5が制御され、現ラインのデータに
代えて直前ラインの当該ブロックのデータがラインメモ
リ4より読み出される。Next, when reading out the four-picture signal of the current line written in the line memory 3 during the period tr in FIG. 1'', the block is a complex calligraphic stroke, and the data in the line memory 3 is output to the band compression circuit 9 for one block via the switching circuit 5. Also, the data in the change point number memory 2 is In this case, the switching circuit 5 is controlled as a simple calligraphy pattern, and the data of the corresponding block of the previous line is read out from the line memory 4 instead of the data of the current line.
このように順次各ブロックのデータを送出するにあたり
、読出し回路10は各ブロック内の両信号の変化点数に
より複雑な書画の画信号に対しては現ラインの信号を、
簡単な書画の両信号に対してはその直前のラインの該当
するブロックの信号を、それぞれ帯域圧縮回路9に送出
する。In order to send the data of each block sequentially in this way, the readout circuit 10 transmits the signal of the current line to the image signal of the complicated calligraphy and drawings depending on the number of change points of both signals in each block.
For both simple calligraphy and drawing signals, the signals of the corresponding blocks in the immediately preceding line are sent to the band compression circuit 9, respectively.
ところで、モディファイドリード方式等の2次元帯域圧
縮方式では前ラインと似かよちた画信号の符号は短くな
ることが知られている。従って本実施例のように、書画
が単純なパターンの場合には、各ラインをその直前ライ
ンと類似した信号に変換するようにすれば、上記帯域圧
縮回路9において画信号の劣化を余り目立たなくして圧
縮効率の良い信号に変換することができる。By the way, it is known that in a two-dimensional band compression method such as a modified read method, the code of an image signal similar to the previous line becomes shorter. Therefore, when the calligraphy and drawings have a simple pattern as in this embodiment, by converting each line into a signal similar to the line immediately before it, deterioration of the image signal in the band compression circuit 9 can be made less noticeable. can be converted into a signal with good compression efficiency.
以上のように、本発明によれば、走査ラインを一定長の
ブロックに分割し、各ブロック毎に白。As described above, according to the present invention, a scanning line is divided into blocks of a constant length, and each block is divided into white blocks.
黒画素の変化点の数を針数し、当該変化点数が所定値以
下となる区間については直前のラインの当該区間の画信
号を現走査ラインの画信号とし、このよ・うな画信号に
対して2次元帯域圧縮を行なうようにしたので、副走査
のピッチを変化させる。ことなく符号発生ビットを減少
でき、圧縮効率を上げることができるとともに、伝送書
画の画質の劣化を極めて少なくすることができる効果が
ある。The number of changing points of black pixels is counted as the number of stitches, and for sections where the number of changing points is less than a predetermined value, the image signal of the corresponding section of the immediately previous line is taken as the image signal of the current scanning line. Since the two-dimensional band compression is performed using the two-dimensional band compression, the pitch of the sub-scanning is changed. This has the effect of reducing the number of code generation bits, increasing compression efficiency, and minimizing deterioration in image quality of transmitted documents and images.
第1図は本発明の一実施例によるファクシミリ装置のブ
ロック図、第2図は第1図の装置の各部の波形及び動作
タイミングを示す図である。
8・・・光電変換回路(読取回路)、1・・・変化点計
数回路、3.4・・・ラインメモリ、10・・・読出し
回路、9・・・帯域圧縮回路。
なお図中同一符号は同−又は相当部分を示す。
代理人 大岩増雄FIG. 1 is a block diagram of a facsimile apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing waveforms and operation timings of various parts of the apparatus of FIG. 8... Photoelectric conversion circuit (reading circuit), 1... Change point counting circuit, 3.4... Line memory, 10... Reading circuit, 9... Band compression circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa
Claims (1)
て、原稿面を走査し書画を読取る読取回路と、該読取回
路からの画信号を1ラインずつ順次切替えて記憶する2
つのラインメモリと、上記読取回路からの一走査ライン
を一定長毎に分割した各区間内の画素の変化点の個数を
該各区間毎に計数する変化点針数回路と、当該計数した
変化点数が所定値を上回る区間については該区間を含む
一走査ラインの画信号を記憶している方のラインメモリ
から当該区間の画信号を読出し下回る区間についてはそ
の直前の走査ラインの画信号を記憶している他方のライ
ンメモリから該当する区間の画信号を読出す読出し回路
と、該続出し回路の出力を2次元帯域圧縮する帯域圧縮
回路とを備えたことを特徴とするファクシミリ装置。(1) In a facsimile machine that transmits binary images, there is a reading circuit that scans the document surface and reads calligraphic strokes, and a system that sequentially switches and stores image signals from the reading circuit line by line.
a line memory, a changing point stitch number circuit that counts the number of changing points of pixels in each section obtained by dividing one scanning line from the reading circuit into each section, and the counted changing point number. For a section in which the value exceeds a predetermined value, the image signal for the section is read out from the line memory that stores the image signal for one scanning line that includes the section, and for a section where it is lower than the predetermined value, the image signal for the immediately preceding scanning line is stored. 1. A facsimile apparatus comprising: a readout circuit for reading out an image signal of a corresponding section from the other line memory in which the facsimile apparatus is provided; and a band compression circuit for two-dimensional band compression of the output of the continuous output circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24976683A JPH0767140B2 (en) | 1983-12-23 | 1983-12-23 | Equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24976683A JPH0767140B2 (en) | 1983-12-23 | 1983-12-23 | Equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60134665A true JPS60134665A (en) | 1985-07-17 |
JPH0767140B2 JPH0767140B2 (en) | 1995-07-19 |
Family
ID=17197905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24976683A Expired - Lifetime JPH0767140B2 (en) | 1983-12-23 | 1983-12-23 | Equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0767140B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01268350A (en) * | 1988-04-20 | 1989-10-26 | Hitachi Ltd | Encoding device |
JPH02216977A (en) * | 1989-02-16 | 1990-08-29 | Nec Corp | Picture information processing circuit |
JPH03165181A (en) * | 1989-08-04 | 1991-07-17 | Internatl Business Mach Corp <Ibm> | High quality compression method of binary text picture |
-
1983
- 1983-12-23 JP JP24976683A patent/JPH0767140B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01268350A (en) * | 1988-04-20 | 1989-10-26 | Hitachi Ltd | Encoding device |
JPH02216977A (en) * | 1989-02-16 | 1990-08-29 | Nec Corp | Picture information processing circuit |
JPH03165181A (en) * | 1989-08-04 | 1991-07-17 | Internatl Business Mach Corp <Ibm> | High quality compression method of binary text picture |
Also Published As
Publication number | Publication date |
---|---|
JPH0767140B2 (en) | 1995-07-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |