JPS62222106A - Variable space filter - Google Patents
Variable space filterInfo
- Publication number
- JPS62222106A JPS62222106A JP61064694A JP6469486A JPS62222106A JP S62222106 A JPS62222106 A JP S62222106A JP 61064694 A JP61064694 A JP 61064694A JP 6469486 A JP6469486 A JP 6469486A JP S62222106 A JPS62222106 A JP S62222106A
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- Prior art keywords
- cell
- substrate
- output
- signal
- sum signal
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Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 230000000903 blocking effect Effects 0.000 claims abstract 2
- 238000000034 method Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000006870 function Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000010354 integration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Image Input (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、複数の受光セルとメモリセル等を備え、該メ
モリセル中に記憶保持された荷重関数に係わる情報に従
って所望の受光セルの出力信号の総和を出力することに
より時間的に並列な信号処理を実行し、かつ、荷重関数
の可変性を有する可変空間フィルタに関するものである
。Detailed Description of the Invention [Industrial Application Field] The present invention comprises a plurality of light-receiving cells, memory cells, etc., and outputs a desired light-receiving cell according to information related to a weight function stored in the memory cells. The present invention relates to a variable spatial filter that performs temporally parallel signal processing by outputting the sum of signals and has a variable weight function.
従来より、空間的に分布する照射光の強度のパターンま
たは画像を検出・計測し有益な情報を取り出す固体化セ
ンシングデバイスは数多く用いられており、枚挙にいと
まない。それらは大別して２種に分かれる。
すなわち、（１）ＣＯＤのように、受光部で検
出した画像を時間的直列な電気信号に変換し、順次、出
力するものと、
（２）スリット列による集積化空間フィルタのように空
間的荷重関数により並列的に処理した信号を実時間で出
力するものである。Conventionally, a large number of solid-state sensing devices have been used to extract useful information by detecting and measuring spatially distributed patterns or images of the intensity of irradiated light, and the list is too numerous to list. They can be roughly divided into two types.
In other words, (1) a COD that converts the image detected by the light receiving part into a temporally serial electrical signal and outputs it sequentially; (2) a spatial filter that converts the image detected by the light receiving section into a temporally serial electrical signal and outputs it sequentially; It outputs signals processed in parallel using functions in real time.
後者の例では、第２図に示すように、特願昭６０−１５
５４６２ ｒ非接触直径測定装置」、特願昭６０−１
５５４６３「非接触の直径測定装置」、特願昭６０−１
５５４６４ 「非接触式の直径測定装置」、特願昭６０
−１５５４６５ 「非接触方式の直径測定装置」におい
て、２ｎ個の同寸法の矩形状の光検出器でなる光検出器
アレイたるスリット列形空間フィルタを用いて、照射投
影された円形像の移動速度と直径の情報を含む出力信号
を実時間で出力するように、空間的並列信号処理機能を
有し、集積化・固体化に適する空間フィルタ素子および
それを用いた装置、方式などの発明が知られている。In the latter example, as shown in Figure 2, the patent application
5462 r Non-contact diameter measuring device”, patent application 1986-1
55463 "Non-contact diameter measuring device", patent application 1986-1
55464 "Non-contact diameter measuring device", patent application 1986
-155465 In a "non-contact diameter measuring device", a slit array spatial filter, which is a photodetector array consisting of 2n rectangular photodetectors of the same size, is used to move a projected circular image. Inventions include a spatial filter element that has a spatially parallel signal processing function and is suitable for integration and solid-state production, and devices and methods using the same, so as to output an output signal containing velocity and diameter information in real time. Are known.
従来技術のうち、ＣＯＤなどのように検出した画像を時
間的直列な電気信号に変換し、順次、出力するものは、
外部に汎用性のある信号処理系を接続して様々な信号処
理を行って有用な情報を取り出すことができるが、信号
を処理系に転送する際、すべての画像情報を順次伝送す
る必要があることから一定の時間を要する。従っである
限界、つまり、該一定の時間よりも動きの速い対象には
追従できず移動速度など動的な情報を得るには適さなか
った。また、集積化した空間フィルタのように空間的荷
重関数により並列的に信号処理をして有用な情報を含む
信号を実時間で出力するものは対象の移動速度・方向な
ど動的な情報を得るには適するが、荷重関数を変えるに
は通さず、従って信号処理は固定化され変更できない欠
点があった。Among conventional technologies, those such as COD that convert detected images into temporally serial electrical signals and output them sequentially are:
It is possible to connect an external general-purpose signal processing system to perform various signal processing and extract useful information, but when transferring the signal to the processing system, all image information must be transmitted sequentially. Therefore, it takes a certain amount of time. Therefore, there is a certain limit, that is, it is not possible to follow objects that move faster than the certain period of time, and is not suitable for obtaining dynamic information such as moving speed. In addition, integrated spatial filters that process signals in parallel using spatial weighting functions and output signals containing useful information in real time can obtain dynamic information such as the speed and direction of movement of the target. However, it is not possible to change the weight function, so the signal processing is fixed and cannot be changed.
本発明の目的は、以上、述べた欠点を解消すること、並
びに実現困難であった画像やパターンの動的な情報を検
出するに通した性質と信号処理の内容を変更可能な性質
を併せ持つ可変空間フィルタを提供することにある。The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to provide a variable signal processing system that has both the property of detecting dynamic information of images and patterns, which has been difficult to realize, and the property of being able to change the content of signal processing. The purpose is to provide a spatial filter.
本発明の構成を第１図に示す。図において、１は基板で
例えばＳｉなどで成る。この基板上には照射光の強度に
応じた出力信号を出力する複数個の受光セル２が設けら
れ、この受光セル２は例えば照射光の強度に応じた光電
流を出力するＳｉホトダイオードなどで実現される。本
図では受光セル２が４個の場合を示している。３は和信
号の出力線であって、例えば基板上に配線された金属薄
膜による導線で受光セル２からの光電流などの出力信号
を受領してその信号の和の信号を基板外に、または基板
中の信号処理回路に伝送出力する。The configuration of the present invention is shown in FIG. In the figure, 1 is a substrate made of, for example, Si. A plurality of light-receiving cells 2 that output output signals according to the intensity of the irradiated light are provided on this substrate, and the light-receiving cells 2 are realized by, for example, a Si photodiode that outputs a photocurrent according to the intensity of the irradiated light. be done. This figure shows a case where there are four light receiving cells 2. Reference numeral 3 denotes a sum signal output line, which is, for example, a conducting wire made of a thin metal film wired on the substrate, and receives an output signal such as a photocurrent from the light receiving cell 2, and sends the sum signal to the outside of the substrate, or Transmits and outputs to the signal processing circuit in the board.
図では和信号の出力線が２本である場合を示しである。The figure shows a case where there are two output lines for the sum signal.
それぞれの受光セル２からの出力信号は伝達切換手段４
を介して和信号の出力線に伝達される。伝達切換手段４
は遮断可能であり、例えばゲート電圧により伝達・遮断
の切換えを行う５ｉＦＥＴのトランスミッションゲート
などで成る。図では、４つの受光セルと２本の和信号の
出力線のすべての組合わせの伝達を可能とする如く８個
の伝達切換手段４としである。かかる伝達切換手段４の
近傍に配置されたメモリセル５は、伝達切換手段４の伝
達あるいは遮断を制御する荷重情報を記憶保持し、かつ
、この荷重情報に従って該伝達切換手段４を制御する機
能を有する。The output signal from each light receiving cell 2 is transferred to the transmission switching means 4.
is transmitted to the output line of the sum signal. Transmission switching means 4
can be cut off, and is made up of, for example, a 5iFET transmission gate that switches between transmission and cutoff depending on the gate voltage. In the figure, eight transmission switching means 4 are provided so as to enable transmission of all combinations of four light receiving cells and two sum signal output lines. A memory cell 5 arranged near the transmission switching means 4 stores load information for controlling transmission or cutoff of the transmission switching means 4, and has a function of controlling the transmission switching means 4 according to this load information. have
メモリセル５は、例えばＳｉトランジスタによるフリッ
プフロップなどで実現される。メモリセル５の荷重情報
を書き込むメモリ書き込み手段６は、例えば行および列
デコーダ、列選択スイッチなどから構成される。The memory cell 5 is realized, for example, by a flip-flop using a Si transistor. Memory writing means 6 for writing load information in memory cells 5 is comprised of, for example, row and column decoders, column selection switches, and the like.
本発明の作用について説明する。基板１上に設けられた
受光セル２は、被測定対象たる画像または照射光パター
ンを検出する。メモリセル５は、空間的並列処理に用い
る荷重情報（荷重パターン）を記憶保持する。荷重情報
とは、それぞれの受光セルの出力信号が、どの和信号の
出力線に伝達されるべきかを指定する情報である。メモ
リセル５はまた、荷重情報として指定された特定の受光
セル２の出力信号を特定の和信号の出力線に伝達する如
く伝達切換子￥ｊｔ４を制御する。伝達切換手段４は、
メモリセルの制御に応じて伝達・遮断動作を行う。和信
号の出力線３は、伝達切換手段４を介して受光セル２か
らの出力信号を受領しそれらの和の信号を基板外部に、
または基板内の信号処理回路に出力する。メモリ書込み
手段６は荷重情報をメモリセル５に書込む。The operation of the present invention will be explained. A light receiving cell 2 provided on a substrate 1 detects an image or an irradiated light pattern of an object to be measured. The memory cell 5 stores and holds load information (load pattern) used for spatial parallel processing. The load information is information that specifies which sum signal output line the output signal of each light-receiving cell should be transmitted to. The memory cell 5 also controls the transmission switch \jt4 so as to transmit the output signal of the specific light receiving cell 2 designated as the load information to the output line of the specific sum signal. The transmission switching means 4 is
Transmission and cutoff operations are performed according to the control of memory cells. The sum signal output line 3 receives the output signal from the light receiving cell 2 via the transmission switching means 4, and sends the sum signal to the outside of the board.
Or output to the signal processing circuit inside the board. Memory writing means 6 writes load information into memory cells 5.
以下、図面に基づいて本発明の詳細な説明する。 Hereinafter, the present invention will be explained in detail based on the drawings.
第３図は本発明の実施例の全体構成を示す図、第４図は
本発明の受光セル付近における構成の一実施例の詳細を
示す図である。第３図では基板１上に配置された和信号
の出力線３とメモリ書込み手段６を示し、受光セル等を
含む画素７を配列してなる受光領域８の内部詳細につい
ては模式的に示しである。FIG. 3 is a diagram showing the overall configuration of an embodiment of the present invention, and FIG. 4 is a diagram showing details of an embodiment of the configuration near the light receiving cell of the present invention. FIG. 3 shows the sum signal output line 3 and memory writing means 6 arranged on the substrate 1, and does not schematically show the internal details of the light-receiving area 8, which is formed by arranging pixels 7 including light-receiving cells. be.
受光領域８は、画素７を多数規則的に、例えば縦横３２
Ｘ ３２ ＝ １０２４（ＩＮの升目状に配列してな
っている。各々の画素７にはメモリ書込み手段６より１
本のワード線９と１本または複数本のデータ線１０が配
線され、両線を適宜選択して任意の画素を選び、その画
素中の任意のメモリセルに所望の情報を書き込むことが
できる。第３図では、１０２４個の画素のうち１個の画
素についての配線が示しであるが、実際の配線はすべて
の画素について同様におこなわれる。本発明の特徴は和
信号の出力線がすべての画素に接続され、荷重情報で措
定されたすべての受光セルの出力信号の和が同時に和信
号の出力線３に出力されることである。すなわち、和信
号の出力線により、受光領域中における所望の受光セル
すべての信号の和が実時間で出力される。第４図では１
個の画素の内部構成を示すとともに、受光セル２の出力
信号を伝達切換手段４を介して所望の和信号の出力線３
に伝送するためのメモリセル５近傍の配線を表している
。The light receiving area 8 includes a large number of pixels 7 regularly, for example, 32 pixels in the vertical and horizontal directions.
X 32 = 1024 (IN is arranged in a square shape. Each pixel 7 receives one from the memory writing means 6.
A word line 9 and one or more data lines 10 are wired, and by appropriately selecting both lines, an arbitrary pixel can be selected, and desired information can be written into an arbitrary memory cell in the pixel. Although FIG. 3 shows wiring for one pixel among 1024 pixels, actual wiring is performed in the same way for all pixels. The feature of the present invention is that the sum signal output line is connected to all pixels, and the sum of the output signals of all the light receiving cells determined by the weight information is simultaneously output to the sum signal output line 3. That is, the sum signal output line outputs the sum of signals of all desired light receiving cells in the light receiving area in real time. In Figure 4, 1
In addition to showing the internal structure of each pixel, the output signal of the light receiving cell 2 is transmitted via the transmission switching means 4 to the output line 3 of the desired sum signal.
It shows the wiring near the memory cell 5 for transmitting data to the memory cell 5.
本実施例ではメモリセル５は通常のＳＲＡＭ （スタテ
ィックＲＡＭ ）のセルと同様のフリップフロップであ
る。本実施例では１画素中に２つのメモリセル５を有す
るので、通常ＳＲＡＭの配線と同様に各々のメモリセル
に対しワード線９が１本とデータ線１０が２本必要であ
る。第４図では２つのメモリセル５のデータ線のうちビ
ット指定をするデータ線１０ｃを共用とし、メモリセル
の内容を指定するデータ線１０ａ 、１０ｂと合わせて
３本で実現している。In this embodiment, the memory cell 5 is a flip-flop similar to a normal SRAM (static RAM) cell. Since this embodiment has two memory cells 5 in one pixel, one word line 9 and two data lines 10 are required for each memory cell, similar to the wiring of a normal SRAM. In FIG. 4, among the data lines of the two memory cells 5, the data line 10c for specifying bits is shared, and the data line 10a and 10b for specifying the contents of the memory cells are used together to realize three lines.
そして、メモリセルで記憶保持する電気信号が論理値１
の場合には対応する伝達切換手段４は伝達動作を用い、
論理値Ｏの場合には対応する伝達切換手段４は遮断動作
を行うものとする。この構成により任意の受光セルの出
力信号の和を取って和信号の出力線に出力できる。Then, the electrical signal stored and held in the memory cell has a logic value of 1.
In the case of , the corresponding transmission switching means 4 uses the transmission operation,
In the case of the logical value O, the corresponding transmission switching means 4 shall perform a cutoff operation. With this configuration, it is possible to sum the output signals of arbitrary light-receiving cells and output the sum to the sum signal output line.
本実施例は、特定の荷重を書き込んだ後は通常の空間フ
ィルタと同様に実時間で有用な情報を含んだ信号を出力
する。例えば、３２ Ｘ ３２個の画素を縦の列により
組分けし、奇数番目の列に属する受光セルの出力信号は
すべて第１の和信号の出力線に接続し、偶数番目の列に
属する受光セルの出力信号はすべて第２の和信号の出力
線に伝達される如く荷重情報を設定することにより、実
質的に縦方向スリット列の差動形空間フィルタと同等の
動作をする。すなわち出力信号は、受光領域に照射投影
された像の横方向の移動速度に比例する中心周波数を有
する。また画素を横の行により組分けし、奇数番目の行
に屈する受光セルと偶数番目の行に冗する受光セルとに
２分して和信号の出力線に前記と同様の伝達を行う如く
荷重情報を設定することにより、実質的に横方向スリッ
ト列の空間フィルタと同等の動作をする。すなわち、出
力信号は像の縦方向の移動速度に比例する中心周波数を
有する。さらにまた、スリット形状に代わり、特定のパ
ターンを荷重情報として指定することによりパターンマ
ツチングの動作も可能である。このように本実施例は従
来の空間フィルタ同様、像の移動速度等の動的情報を検
出・測定するのに適するのみならず、荷重情報の切換え
によりＸ方向、ｙ方向の移動速度を切り換えて出力した
り、パターンマツチング等の動作も可能であり、１個の
素子で数多くの計測が可能である。In this embodiment, after writing a specific load, a signal containing useful information is output in real time like a normal spatial filter. For example, if 32 x 32 pixels are grouped into vertical columns, the output signals of the light-receiving cells belonging to the odd-numbered columns are all connected to the output line of the first sum signal, and the output signals of the light-receiving cells belonging to the even-numbered columns are connected to the output line of the first sum signal. By setting the load information so that all the output signals of the filter are transmitted to the output line of the second sum signal, the filter operates substantially in the same manner as a differential spatial filter with longitudinal slit arrays. That is, the output signal has a center frequency that is proportional to the lateral movement speed of the image projected onto the light receiving area. In addition, the pixels are divided into horizontal rows, and the light-receiving cells are divided into two, with the light-receiving cells in the odd-numbered rows and the redundant light-receiving cells in the even-numbered rows, and the load is applied to the output line of the sum signal in the same way as above. By setting the information, it operates substantially the same as a spatial filter with a row of horizontal slits. That is, the output signal has a center frequency that is proportional to the vertical movement speed of the image. Furthermore, a pattern matching operation is also possible by specifying a specific pattern as load information instead of the slit shape. In this way, like the conventional spatial filter, this embodiment is not only suitable for detecting and measuring dynamic information such as the moving speed of an image, but also can switch the moving speed in the X direction and the Y direction by switching the load information. Operations such as output and pattern matching are also possible, and a large number of measurements can be performed with one element.
また、本実施例ではメモリセルとしてＳＲＡＭに用いら
れる様なフリップフロップを用いているが、これに代わ
りＤＲＡＭ （ダイナミックＲＡＭ ”）のメモリセル
の回路方式を採用すれば、より集積化に有利な小形のセ
ルで同様の動作を行うことができる。In addition, in this embodiment, a flip-flop like that used in SRAM is used as a memory cell, but if a DRAM (dynamic RAM) memory cell circuit system is adopted instead, it can be made smaller and more advantageous for integration. A similar operation can be performed with cells.
さらにまたメモリセルとしてのＦＲＯＭ （プログラマ
ブルＲＯＭ ）のメモリセルを用いれば、１種類の素子
で用途に応じた固定の荷重を設定しうるプログラマブル
な空間フィルタとすることができる。あるいはまたメモ
リセルを基板中に３次元的に集積化すれば、基板表面を
受光領域として有効に活用した３次元素子とすることが
できる。Furthermore, if a FROM (programmable ROM) memory cell is used as a memory cell, a programmable spatial filter can be obtained in which a fixed load can be set depending on the application using one type of element. Alternatively, if memory cells are three-dimensionally integrated in a substrate, a three-dimensional element can be obtained that effectively utilizes the surface of the substrate as a light-receiving region.
以上、述べたように、本発明が提供する素子は、照射投
影された像の移動速度など動的な情報を得るのに通した
空間的並列な信号処理機能を有し、実時間の信号を出力
するのみならず、荷重情報を書替える事により１個の素
子で様々な信号処理を切換えて実行できる。また、和信
号の出力線の数は受光セルの数に依らず小数であり集積
化に通した構造である。As described above, the device provided by the present invention has a spatially parallel signal processing function through which dynamic information such as the moving speed of an irradiated and projected image can be obtained, and a real-time signal can be processed. In addition to outputting, by rewriting the load information, one element can switch and execute various signal processes. Further, the number of output lines for the sum signal is a decimal number regardless of the number of light receiving cells, and the structure is suitable for integration.
第１図は本発明の全体構造を示す図、第２図は従来技術
の「非接触直径測定装置」の構成を示す図、第３図は本
発明の実施例の全体構造を示す図、第４図は本発明の実
施例の受光セル付近の構成詳細を示す図である。
図において、１は基板、２は受光セル、３は和信号の出
力線、４は伝達切換手段、５はメモリセル、６はメモリ
書込み手段、７は画素、８は受光領域、９はワード線、
１０はデータ線、１１〜２０は欠番、２１は光検出器ア
レイ、２２は光学系、２３は円形被測定物、２４は円形
像、２５は差動増幅回路、２６は演算装置をそれぞれ示
す。
特許出願人 アンリツ株式会社
小林 彬FIG. 1 is a diagram showing the overall structure of the present invention, FIG. 2 is a diagram showing the configuration of a conventional "non-contact diameter measuring device," FIG. 3 is a diagram showing the entire structure of an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing details of the configuration near the light receiving cell of the embodiment of the present invention. In the figure, 1 is a substrate, 2 is a light receiving cell, 3 is a sum signal output line, 4 is a transmission switching means, 5 is a memory cell, 6 is a memory writing means, 7 is a pixel, 8 is a light receiving area, 9 is a word line ,
10 is a data line, 11 to 20 are missing numbers, 21 is a photodetector array, 22 is an optical system, 23 is a circular object to be measured, 24 is a circular image, 25 is a differential amplifier circuit, and 26 is an arithmetic unit. . Patent applicant Akira Kobayashi Anritsu Corporation
Claims (1)
度に応じた出力信号を出力する複数個の受光セル（２）
と；該複数個の受光セルの１または２以上の受光セルか
らの出力信号を受領してその信号の和を伝送出力するた
めの１または２以上の和信号の出力線（３）と；該複数
個の受光セルからの出力信号を受けてそれをある１つの
和信号の出力線に伝達あるいは遮断できる伝達切換手段
（４）と；該基板中に設けられ、該伝達切換手段の伝達
あるいは遮断を指定するための荷重情報を記憶保持し、
該荷重情報に従って該伝達切換手段を制御するメモリセ
ル（５）と；該メモリセル中に荷重情報を書き込むメモ
リ書込み手段（６）とを備え、上記受光セル、上記和信
号の出力線、上記伝達切換手段、上記メモリセル、上記
メモリ書込手段が該基板中に２次元的あるいは３次元的
に集積化されて成る可変空間フィルタ。a substrate (1); a plurality of light receiving cells (2) provided on the substrate (1) and outputting an output signal according to the intensity of irradiated light;
and; one or more sum signal output lines (3) for receiving output signals from one or more of the plurality of light receiving cells and transmitting and outputting the sum of the signals; a transmission switching means (4) capable of receiving output signals from a plurality of light-receiving cells and transmitting or blocking the output signals to a certain sum signal output line; provided in the substrate; Memorizes and retains load information for specifying
A memory cell (5) for controlling the transmission switching means according to the load information; and a memory writing means (6) for writing the load information into the memory cell, the light receiving cell, the output line for the sum signal, and the transmission A variable spatial filter in which a switching means, the memory cell, and the memory writing means are two-dimensionally or three-dimensionally integrated into the substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61064694A JPH07117379B2 (en) | 1986-03-25 | 1986-03-25 | Variable space filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61064694A JPH07117379B2 (en) | 1986-03-25 | 1986-03-25 | Variable space filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62222106A true JPS62222106A (en) | 1987-09-30 |
| JPH07117379B2 JPH07117379B2 (en) | 1995-12-18 |
Family
ID=13265509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61064694A Expired - Lifetime JPH07117379B2 (en) | 1986-03-25 | 1986-03-25 | Variable space filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07117379B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5422848A (en) * | 1977-07-22 | 1979-02-21 | Nippon Chemical Ind | Space frequency component extraction device for optical images |
| JPS60134991A (en) * | 1983-12-23 | 1985-07-18 | Toshiba Corp | Picture processor |
-
1986
- 1986-03-25 JP JP61064694A patent/JPH07117379B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5422848A (en) * | 1977-07-22 | 1979-02-21 | Nippon Chemical Ind | Space frequency component extraction device for optical images |
| JPS60134991A (en) * | 1983-12-23 | 1985-07-18 | Toshiba Corp | Picture processor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07117379B2 (en) | 1995-12-18 |
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