JPS6159033B2 - - Google Patents

Description

【発明の詳細な説明】 本発明は画信号を読取る方式で画信号に中間領
域を設定した画信号読取り方式に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image signal reading method in which an intermediate region is set in the image signal.

従来の画信号読取り方式を第１図に示す。第１
図において０は反射光、１は光電変換器、２は比
較回路、３は直流電圧源、４は出力端子の如く構
成されており、パターン情報からの反射光０が光
電変換器１の中の光電変換素子により電気エネル
ギーに変換されて画信号として比較回路２の一方
の入力端子に入力される。他方の入力端子は直流
電圧源３からの直流電圧が入力され比較回路２の
出力には２値化された信号が出力される。第２図
は上述した画信号読取り方式における光電変換器
１の出力の画信号と直流電圧源３の電圧を変えた
ときの比較回路２の出力との関係を説明するため
の図でｎ１，ｎ２，ｎ３……は光電変換器１でサ
ンプルした光量に対する相対出力で、Ａ，Ｂは直
流電圧源３の電圧を示す。直流電圧源３をＡに選
択すると比較回路の出力はｎ４〜ｎ７が「クロ」
となる。又Ｂに選択するとｎ６，ｎ７が「クロ」
となる。このときｎ４，ｎ５は直流電圧源３の電
圧をＡにした場合は「クロ」でｎ６，ｎ７と同じ
出力と看され、又Ｂにした場合は「シロ」でｎ１
〜ｎ３，ｎ８と同じ出力と看されてしまい、どの
ように直流電圧源３の電圧を選択しても、ｎ４，
ｎ５のレベルを他のサンプル点と区別出来ず分解
能が上がらない欠点があつた（つまりｎ４とｎ５
のレベルは、常に、ｎ１〜ｎ３のレベル又はｎ６
〜ｎ７のレベルと同じになる）。 A conventional image signal reading system is shown in FIG. 1st
In the figure, 0 is a reflected light, 1 is a photoelectric converter, 2 is a comparison circuit, 3 is a DC voltage source, and 4 is an output terminal. The photoelectric conversion element converts it into electrical energy and inputs it to one input terminal of the comparator circuit 2 as an image signal. The other input terminal receives the DC voltage from the DC voltage source 3, and the comparator circuit 2 outputs a binary signal. FIG. 2 is a diagram for explaining the relationship between the image signal output from the photoelectric converter 1 and the output of the comparator circuit 2 when the voltage of the DC voltage source 3 is changed in the image signal reading method described above. , n3... are relative outputs with respect to the amount of light sampled by the photoelectric converter 1, and A and B indicate the voltage of the DC voltage source 3. When DC voltage source 3 is selected as A, the output of the comparator circuit is "black" for n4 to n7.
becomes. Also, if you select B, n6 and n7 will be "black"
becomes. At this time, when the voltage of the DC voltage source 3 is set to A, n4 and n5 are considered to be "black" and have the same output as n6 and n7, and when set to B, they are "white" and n1
~n3, n8 are considered to have the same output, and no matter how you select the voltage of DC voltage source 3, n4,
There was a drawback that the level of n5 could not be distinguished from other sample points and the resolution could not be improved (that is, the level of n4 and n5
The level of is always the level of n1 to n3 or n6
~ the same level as n7).

本発明は従来の技術の欠点を改善することを目
的とし、比較回路を２回路使用して中間領域を設
定し、画信号を中間領域内と中間領域外に判別し
中間領域内のときは前ラインの信号の極性を反転
して出力とし中間領域外のときは片方の比較回路
の出力を使用して画信号の中間領域の分解能を上
げるものである。 The present invention aims to improve the drawbacks of the conventional technology, and uses two comparison circuits to set an intermediate area, and distinguishes the image signal between inside and outside the intermediate area, and when it is within the intermediate area, the image signal is The polarity of the line signal is inverted and output, and when it is outside the intermediate area, the output of one of the comparison circuits is used to increase the resolution of the intermediate area of the image signal.

以下図面により実施例を説明する。 Examples will be described below with reference to the drawings.

第３図は本発明の第１の実施例であつて０は反
射光、１は光電変換器、５は比較回路Ａ、６は比
較回路Ｂ、７は直流電圧源、８は中間領域判別回
路、９は切換スイツチ、１０は記憶回路、１１は
出力端子である。 FIG. 3 shows the first embodiment of the present invention, in which 0 is reflected light, 1 is a photoelectric converter, 5 is a comparison circuit A, 6 is a comparison circuit B, 7 is a DC voltage source, and 8 is an intermediate region discrimination circuit. , 9 is a changeover switch, 10 is a memory circuit, and 11 is an output terminal.

パターン情報からの反射光０が光電変換器１の
中の光電変換素子により電気エネルギーに変換さ
れて画信号として５の比較回路Ａ及び６の比較回
路Ｂの各入力端子に入力される。５の比較回路Ａ
の入力端子には直流電圧源７からの直流電圧Ａ
が、又６の比較回路Ｂの入力端子には直流電圧Ｂ
が入力される。直流電圧源７の直流電圧のＡとＢ
はＡ＞Ｂの関係とする。画信号は各比較回路で直
流電圧Ａ，Ｂと比較されて各出力には２値化され
た信号が出力して中間領域判別回路８に入る。こ
の判別回路では画信号が直流電圧源７の直流電圧
ＡとＢの間にある場合、すなわち画信号が中間領
域内の場合と、画信号が直流電圧ＡとＢの間にな
い場合、すなわち中間領域外の場合とを判別して
いる。例えばEXOR回路により構成する。つぎの
切換スイツチ９では中間領域判別回路８の判別に
したがつて信号を切換えてこの出力が出力端子１
１と記憶回路１０に接続される。記憶回路１０で
は常に現在読取つているラインの中の１サンプル
と同じ位置の１ライン遅延した１サンプルの信号
を極性を反転して出力している。したがつて中間
領域外の場合は５の比較回路Ａの２値化された信
号が出力端子１１へ、又中間領域内の場合は記憶
回路１０で１ライン遅延した前ラインの信号が極
性が反転して出力端子１１へ出力される。第４図
Ａ，Ｂは上述した画信号読取り方式における光電
変換器１の出力と出力端子１１の出力との関係を
説明するための図で、第４図Ａは光電変換器１で
ｎ１，ｎ２，ｎ３……とサンプルした光量の相対
出力を示し、Ａ及びＢは直流電圧源７から各比較
回路に入力している直流電圧を示す。（Ａ＞Ｂ）。
第４図Ｂは出力端子１１の出力を示し、ｍ１，ｍ
２，ｍ３……は各ライン、ｎ１，ｎ２，ｎ３……
は各サンプルを示す。第４図Ｂの動作条件はライ
ンｍ１の前ラインはすべて「クロ」でラインｍ１
〜ｍまでのサンプルｎ１〜ｎ８の相対出力はすべ
て同じとする。ラインｍ１ではｎ１〜ｎ３は中間
領域外なので「シロ」、ｎ４，ｎ５は中間領域内
なので記憶回路１０で記憶している前ラインの極
性を反転した信号が出力され「シロ」となり、ｎ
６，ｎ７，ｎ８は中間領域外なのでｎ６，ｎ７が
「クロ」、ｎ８が「シロ」となる。ラインｍ２では
ｎ１〜ｎ３は中間領域外なので「シロ」、ｎ４，
ｎ５は中間領域内なので前ラインｍ１の極性を反
転した「クロ」となり、ｎ６，ｎ７，ｎ８は中間
領域外なのでｎ６，ｎ７が「クロ」、ｎ８が「シ
ロ」となる。同じようにラインｍ３ではｎ１〜ｎ
３，ｎ６，ｎ７，ｎ８は中間領域外なのでライン
ｍ２と変らないが、ｎ４，ｎ５は中間領域内なの
で前ラインｍ２の極性を反転した「シロ」とな
る。 Reflected light 0 from the pattern information is converted into electrical energy by the photoelectric conversion element in the photoelectric converter 1, and is input as an image signal to each input terminal of the comparison circuit A of 5 and the comparison circuit B of 6. Comparison circuit A of 5
DC voltage A from DC voltage source 7 is input to the input terminal of
However, the input terminal of comparator circuit B in No. 6 has DC voltage B.
is input. A and B of the DC voltage of the DC voltage source 7
is assumed to have the relationship A>B. The image signal is compared with DC voltages A and B in each comparison circuit, and a binarized signal is outputted to each output and enters the intermediate region discrimination circuit 8. In this discrimination circuit, when the image signal is between the DC voltages A and B of the DC voltage source 7, that is, the image signal is within the intermediate region, and when the image signal is not between the DC voltages A and B, that is, the intermediate region. It distinguishes between cases outside the area. For example, it is configured by an EXOR circuit. The next changeover switch 9 switches the signal according to the judgment of the intermediate region judgment circuit 8, and this output is sent to the output terminal 1.
1 and the memory circuit 10. The memory circuit 10 always outputs a signal of one sample delayed by one line at the same position as one sample in the line currently being read, with the polarity inverted. Therefore, if it is outside the intermediate region, the binarized signal of the comparator circuit A of 5 is sent to the output terminal 11, and if it is inside the intermediate region, the polarity of the previous line signal delayed by one line in the memory circuit 10 is reversed. and output to the output terminal 11. 4A and 4B are diagrams for explaining the relationship between the output of the photoelectric converter 1 and the output of the output terminal 11 in the above-mentioned image signal reading method. , n3 . . . indicate the relative output of the sampled light amount, and A and B indicate the DC voltages input from the DC voltage source 7 to each comparison circuit. (A>B).
Figure 4B shows the output of the output terminal 11, m1, m
2, m3... are each line, n1, n2, n3...
indicates each sample. The operating conditions in Figure 4B are that all lines before line m1 are "black" and line m1
It is assumed that the relative outputs of samples n1 to n8 from ~m are all the same. In line m1, n1 to n3 are outside the intermediate region, so they are "white", and since n4 and n5 are inside the intermediate region, a signal in which the polarity of the previous line stored in the storage circuit 10 is inverted is output and becomes "white", and n
6, n7, and n8 are outside the intermediate region, so n6, n7 are "black" and n8 is "white." In line m2, n1 to n3 are outside the intermediate area, so they are "white", n4,
Since n5 is within the intermediate region, it becomes "black" by reversing the polarity of the previous line m1, and since n6, n7, and n8 are outside the intermediate region, n6, n7 become "black" and n8 becomes "white." Similarly, on line m3, n1 to n
Lines 3, n6, n7, and n8 are outside the intermediate area and are therefore unchanged from line m2, but lines n4 and n5 are within the intermediate area, so they are "white" with the polarity of the previous line m2 reversed.

以上説明したように、第１の実施例ではライン
方向と直角な方向に対して中間領域判別回路８の
判別が中間領域外の場合は出力は「シロ」又は
「クロ」となり、中間領域内の場合には前ライン
の信号の極性を反転し出力しているため、中間領
域のセルのレベルが１ライン毎に反転し、疑似的
な３値信号となり、従来の２値信号より分解能を
上げることが出来る利点がある。 As explained above, in the first embodiment, when the intermediate area discrimination circuit 8 determines that the area is outside the intermediate area in the direction perpendicular to the line direction, the output becomes "white" or "black"; In some cases, the polarity of the signal from the previous line is inverted and output, so the level of the cells in the intermediate area is inverted for each line, resulting in a pseudo ternary signal, which improves the resolution compared to a conventional binary signal. It has the advantage of being able to

本発明では画信号に中間領域を設定してライン
方向と直角な方向に対して疑似的な３値信号にし
ているので従来の２値信号より分解能を上げるこ
とが出来る。 In the present invention, an intermediate region is set in the image signal to create a pseudo three-value signal in a direction perpendicular to the line direction, so that the resolution can be higher than that of a conventional binary signal.

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

第１図は従来の画信号読取り方式の構成図、第
２図Ａ及びＢは従来の画信号読取り方式における
光電変換器１の出力と比較回路２の出力の説明
図、第３図は本発明の一実施例の構成図、第４図
Ａ及びＢは本発明の光電変換器１の出力と出力端
子１１の出力の説明図である。 ０……パターン情報の反射光、１……光電変換
器、２……比較回路、３……直流電圧源、４……
出力端子、５……比較回路Ａ、６……比較回路
Ｂ、７……直流電圧源、８……中間領域判別回
路、９……切換スイツチ、１０……記憶回路、１
１……出力端子。 FIG. 1 is a configuration diagram of a conventional image signal reading system, FIGS. 2A and B are explanatory diagrams of the output of the photoelectric converter 1 and the output of the comparator circuit 2 in the conventional image signal reading system, and FIG. 3 is a diagram of the present invention. FIGS. 4A and 4B are diagrams illustrating the output of the photoelectric converter 1 and the output of the output terminal 11 of the present invention. 0... Reflected light of pattern information, 1... Photoelectric converter, 2... Comparison circuit, 3... DC voltage source, 4...
Output terminal, 5... Comparison circuit A, 6... Comparison circuit B, 7... DC voltage source, 8... Intermediate region discrimination circuit, 9... Selector switch, 10... Memory circuit, 1
1...Output terminal.

Claims (1)

【特許請求の範囲】[Claims] １ 光電変換器からの画信号を２つの比較回路で
直流電圧Ａ及びＢ（Ａ＞Ｂ）と比較し、各々の比
較出力の一致又は不一致を中間領域判別回路で判
別し、出力端子に接続される１ラインの遅延回路
及び極性反転回路をもうけ、中間領域判別回路が
一致と判別したときは、直流電圧Ａと比較した比
較回路の出力を出力端子に接続し、前記判別回路
が不一致と判別したときは遅延回路及び極性反転
回路の出力を出力端子に接続することを特徴とす
る画信号読取方式。1 The image signal from the photoelectric converter is compared with DC voltages A and B (A>B) using two comparison circuits, and an intermediate region discrimination circuit determines whether the comparison outputs match or do not match. A one-line delay circuit and a polarity inverting circuit are provided, and when the intermediate region discriminating circuit determines that there is a match, the output of the comparison circuit that is compared with the DC voltage A is connected to the output terminal, and when the discriminating circuit determines that there is a mismatch. An image signal reading method characterized in that the outputs of a delay circuit and a polarity inversion circuit are connected to an output terminal.