JPH04178094A - Thinning filter device - Google Patents
Thinning filter deviceInfo
- Publication number
- JPH04178094A JPH04178094A JP2307386A JP30738690A JPH04178094A JP H04178094 A JPH04178094 A JP H04178094A JP 2307386 A JP2307386 A JP 2307386A JP 30738690 A JP30738690 A JP 30738690A JP H04178094 A JPH04178094 A JP H04178094A
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- Japan
- Prior art keywords
- color difference
- signal
- filter
- luminance
- thinning
- 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
- 238000000034 method Methods 0.000 claims description 16
- 230000006870 function Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 9
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Processing Of Color Television Signals (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Color Television Systems (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用ｒ賢
本発明は、帯域制限を行なって色差信号に対応する画素
を間引きするために用いられる帯域制限フィルタの一種
である間引きフィルタ装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thinning filter device, which is a type of band limiting filter used to perform band limiting and thinning out pixels corresponding to color difference signals.
従来の技術
従来の間引きフィルタ装置においては、間引かれた画素
で構成できる画像信号の周波数帯域以外の周波数を、帯
域制限フィルタによって除去したのち、標本化すること
によって画素間引きを行なっていた。従って、２の間引
きを行なう場合には周波数帯域を２に制限することにな
る。2. Description of the Related Art In conventional thinning filter devices, pixels are thinned out by removing frequencies outside the frequency band of an image signal that can be composed of thinned out pixels using a band limiting filter, and then sampling the frequency. Therefore, when thinning out by 2, the frequency band is limited to 2.
発明が解決しようとする課題
しかしながら、上記の様な構成の間引きフィルタ装置に
おいては、帯域制限を行なうために画像のエツジ部にお
いて色信号のにじみが発生し、視覚的に大きな歪みとな
る。更に、帯域制限フィルタの次数が低いとエツジ部で
リンギングが発生し、またフィルタの次数が高いと特に
垂直フィルタの場合にはハードウェア規模が増加する欠
点がある。Problems to be Solved by the Invention However, in the thinning filter device configured as described above, color signal bleeding occurs at the edge portions of the image due to band limitation, resulting in large visual distortion. Furthermore, if the order of the band-limiting filter is low, ringing will occur at the edge portion, and if the order of the filter is high, the hardware scale will increase, especially in the case of a vertical filter.
本発明はかかる点に鑑み、簡単なハードウェアで色信号
の歪みの少ない間引きフィルタ装置を提供することを目
的とする。In view of the above, an object of the present invention is to provide a thinning filter device using simple hardware and causing less distortion of color signals.
課題を解決するための手段
本発明は、画像入力信号の色差信号に対して、周波数帯
域制限を行なって位置Ｘの色差画素間引きを行なう少な
くとも２種類の色差信号間引き手段と、輝度信号の位置
Ｘの近傍の少なくとも２つの輝度画素からなる画素グル
ープＹをその周辺画素から補間生成する各々少なくとも
２種類の輝度補間手段と、前記輝度補間手段で補間生成
された画素グループＹの各画素値を画素グループＹの各
画素の真値と比較してその差の関数で輝度補間手段の組
合せを選択する補間手法選択手段と、前記補間手法選択
手段で選択された輝度補間手段の組合せと一意的に対応
する色差間引き手法で位置Ｘの色差信号を間引きする色
差間引き手段を備え、間引きされた色差信号を出力する
事を特徴とする間引きフィルタ装置である。Means for Solving the Problems The present invention provides at least two types of color difference signal thinning means for performing frequency band limitation on color difference signals of image input signals and thinning out color difference pixels at position at least two types of brightness interpolation means each for interpolating and generating a pixel group Y consisting of at least two brightness pixels in the vicinity of the pixel group Y from the surrounding pixels; An interpolation method selection means that compares the true value of each pixel of Y and selects a combination of brightness interpolation means based on a function of the difference, and a combination of brightness interpolation means selected by the interpolation method selection means uniquely corresponds. This thinning filter device is characterized in that it includes a color difference thinning means for thinning out the color difference signal at position X using a color difference thinning method, and outputs the thinned out color difference signal.
作用
本発明は前記した構成により、間引きを行なう色差信号
の位置Ｘに対して、輝度補間手段は、位置Ｘの近傍の少
なくとも２種類の輝度画素からなる画素グループＹをそ
の周辺画素から少なくとも２種類の補間手段で補間生成
する。補間手法選択手段では、補間生成された画素グル
ープＹの各輝度信号と、画素グループＹの原信号とが比
較され、その差の関数により、色信号の間引き手法が選
択される。色差信号間引き手段では、前記補間手法選択
手段で選択された間引き手法で、位置Ｘの画素間引きを
行なう。その色差信号間引きの際には、その間引き手段
に対応した色差信号帯域制限フィルタがほどこされ、折
り返し歪が除去される。According to the above-described configuration, the luminance interpolation means, for the position X of the color difference signal to be thinned out, divides the pixel group Y consisting of at least two types of luminance pixels in the vicinity of the position X from the surrounding pixels of at least two types. Generate interpolation using the interpolation means. The interpolation method selection means compares each luminance signal of the pixel group Y generated by interpolation with the original signal of the pixel group Y, and selects a color signal thinning method based on a function of the difference. The color difference signal thinning means thins out pixels at position X using the thinning method selected by the interpolation method selection means. When thinning out the color difference signals, a color difference signal band-limiting filter corresponding to the thinning means is applied to remove aliasing distortion.
実施例
第１図は本発明の第１の実施例の間引きフィルタ装置の
ブロック図である。同図において、１は輝度入力信号、
２は輝度フィルタ、３は輝度フィルタ出力、４は色差フ
ィルタを選択するフィルタ選択器、５はフィルタ選択器
６の選択信号、６は色差入力信号、７は色差フィルタ、
８は色差フィルタ出力、９は選択器、１０は間引き信号
である。Embodiment FIG. 1 is a block diagram of a thinning filter device according to a first embodiment of the present invention. In the figure, 1 is a luminance input signal,
2 is a brightness filter, 3 is a brightness filter output, 4 is a filter selector that selects a color difference filter, 5 is a selection signal for the filter selector 6, 6 is a color difference input signal, 7 is a color difference filter,
8 is a color difference filter output, 9 is a selector, and 10 is a thinning signal.
以上のように構成された本実施例の間引きフィルタ装置
について、以下その動作を説明する。本発明は、輝度信
号と色差信号の相関性を利用し、輝度信号の分布によっ
て色差信号のフィルタを切替えることにより、画質を向
上させるものである。The operation of the thinning filter device of this embodiment configured as described above will be described below. The present invention utilizes the correlation between a luminance signal and a color difference signal to improve image quality by switching the filter for the color difference signal depending on the distribution of the luminance signal.
その相関性を利用するものとして、例えば、エツジ検出
の原理について説明する。一般の画像においては、輝度
信号のエツジと色差信号のエツジは一致しており、色差
信号を間引くための色差フィルタによって、エツジで色
にじみが目立つことになる。そこで、輝度信号のエツジ
を検出して輝度信号のエツジと同じ位置に色差信号のエ
ツジが再生できるように色差フィルタを適応的に選ぶこ
とにより、エツジでの色にじみを大幅に減少させること
ができる。第２図はエツジ補正の説明図であり、実線は
輝度信号の振幅、破線は色差信号の振幅の変化を表して
いる。同図（ａ）は通常の色差フィルタを用いた場合で
あり、輝度信号のエツジ部で色差信号が広がっている。For example, the principle of edge detection will be explained as a method that utilizes this correlation. In a general image, the edges of the luminance signal and the edges of the color difference signal match, and color blurring becomes noticeable at the edges due to the color difference filter used to thin out the color difference signal. Therefore, by adaptively selecting a color difference filter that detects the edges of the luminance signal and reproduces the edges of the color difference signal at the same positions as the edges of the luminance signal, color blurring at the edges can be significantly reduced. . FIG. 2 is an explanatory diagram of edge correction, where the solid line represents the amplitude of the luminance signal and the broken line represents the change in the amplitude of the color difference signal. FIG. 5A shows a case where a normal color difference filter is used, and the color difference signal is spread at the edge portion of the luminance signal.
しかしながら、同図（ｂ）の用にエツジ部を強制的に一
致させることにより、色にじみがなくなり、視覚的に良
好な画質となる。However, by forcibly matching the edge portions as shown in FIG. 6(b), color bleeding is eliminated and visually good image quality is obtained.
但し、同図（Ｃ）のように原信号の色差信号の工、ジが
輝度信号のエツジと一致しない場合でも、間開（ｄ）の
ようにエツジが一致する欠点があるが、このようなこと
が発生するのは稀であり、仮に発生しても視覚上問題な
い。さて、第１図において、輝度入力信号１は輝度フィ
ルタ２で帯域制限され、フィルタ選択器４でフィルタ出
力３ａおよび３ｂのいずれが輝度信号１に近いかを判定
する。−古色差入力信号６は色差フィルタ７で帯域制限
されて、フィルタ選択器４の選択信号５で示される色差
フィルタの出力が選択器９で切替えられて間引き信号１
０となる。この間引き信号は色差入力信号６と同しレー
トで出力してもよいが、それよりも低いレートで出力し
ても構わない。フィルタ選択器４で選択信号５を選ぶ基
準としては、先に述べたエツジを保存するようなフィル
タを選んでもよいし、また、他の基準で判断してもよい
。この輝度フィルタ２及び色差フィルタ７は複数のフィ
ルタから１つが選ばれるので、次数が低いフィルタを複
数個切替えることにより多種の画像信号に効率よく対応
できるので、通常の高次数のフィルタを用いる場合より
もハードウェア規模を削減することができる。However, even if the edges of the color difference signal of the original signal do not match the edges of the luminance signal as shown in (C) of the same figure, the edges match as shown in the gap (d). This rarely occurs, and even if it does occur, there is no visual problem. Now, in FIG. 1, a luminance input signal 1 is band-limited by a luminance filter 2, and a filter selector 4 determines which of the filter outputs 3a and 3b is closer to the luminance signal 1. - The old color difference input signal 6 is band-limited by the color difference filter 7, and the output of the color difference filter indicated by the selection signal 5 of the filter selector 4 is switched by the selector 9, and the thinned-out signal 1
It becomes 0. This thinned signal may be output at the same rate as the color difference input signal 6, but may also be output at a lower rate. As a criterion for selecting the selection signal 5 by the filter selector 4, a filter that preserves the edge described above may be selected, or other criteria may be used for determination. Since one of the brightness filters 2 and color difference filters 7 is selected from a plurality of filters, it is possible to more efficiently handle various types of image signals by switching between multiple low-order filters, compared to using ordinary high-order filters. It is also possible to reduce the hardware scale.
以上説明したように、本実施例によれば輝度信号によっ
て色差フィルタを適応的に切替えることにより、ハード
ウェア規模を低減し且つ画質を向上させることができる
。As described above, according to this embodiment, by adaptively switching the color difference filters based on the luminance signal, it is possible to reduce the hardware scale and improve the image quality.
第３図は本発明の第２の実施例である間引きフィルタ装
置のブロック図である。同図において、第１図と同様の
動作をする機器は回し番号を付す。FIG. 3 is a block diagram of a thinning filter device according to a second embodiment of the present invention. In the figure, equipment that operates in the same way as in Figure 1 is numbered.
１ａ及び１ｂは異なる画素位置の輝度入力信号であり、
１１は輝度フィルタとフィルタをかける前の差（誤差）
を計算する誤差計算器であり、１２は誤差信号である。1a and 1b are luminance input signals at different pixel positions,
11 is the difference (error) between the brightness filter and before filtering
12 is an error signal.
以上のように構成された第２の実施例の間引きフィルタ
装置において、以下その動作を説明する。The operation of the thinning filter device of the second embodiment configured as described above will be explained below.
第１の実施例では色差信号に対応する位置の輝度信号の
フィルタ出力によって色差信号を切替えたが、本実施例
では色差信号に対応する位置の近傍の複数の位置の輝度
信号のフィルタ出力によって色差信号を切替える。本実
施例の構成では、先の実施例よりもハードウェア規模は
増加するが、色差フィルタの切替えをより適切に行なう
二とができ、画質を向上させることができる。入力信号
１ａと１ｂを各々輝度フィルタ２ａと２ｂで処理した輝
度信号と元の輝度信号との誤差を誤差計算器１１ａで計
算し、同様に輝度フィルタ２Ｃと２ｄで処理した輝度信
号と元の輝度信号との誤差を誤差計算器１１ｂで計算す
る。誤差信号１２はフィルタ選択器４で処理され、後の
動作は第１の実施例と同しである。すなわち、輝度フィ
ルタ２が２個と誤差計算器１１で先の実施例の輝度フィ
ルタ１個分に対応している。本実施例のように複数の輝
度フィルタで誤差を計算することにより、線部とエツジ
境界（平坦部間の境界）の判断を行なうことができ、線
部では通常の色差帯域フィルタを選択し、エツジ境界で
はエツジを保存する色差フィルタを選択すれば、エツジ
部のみ画質改善を行ない、線部で発生する適応フィルタ
による折り返し歪み等は防くことができる。In the first embodiment, the color difference signal is switched by the filter output of the luminance signal at the position corresponding to the color difference signal, but in this embodiment, the color difference signal is switched by the filter output of the luminance signal at a plurality of positions in the vicinity of the position corresponding to the color difference signal. Switch the signal. Although the configuration of this embodiment increases the hardware scale compared to the previous embodiments, it is possible to switch the color difference filters more appropriately and improve image quality. The error calculator 11a calculates the error between the luminance signals obtained by processing the input signals 1a and 1b by the luminance filters 2a and 2b, respectively, and the original luminance signal, and calculates the error between the luminance signals processed by the luminance filters 2C and 2d in the same way and the original luminance. The error with the signal is calculated by the error calculator 11b. The error signal 12 is processed by the filter selector 4, and the subsequent operation is the same as in the first embodiment. That is, two brightness filters 2 and the error calculator 11 correspond to one brightness filter in the previous embodiment. By calculating the error using multiple luminance filters as in this example, it is possible to judge between line areas and edge boundaries (boundaries between flat areas), and for line areas, a normal color difference band filter is selected, By selecting a color difference filter that preserves edges at edge boundaries, it is possible to improve the image quality only at the edges and prevent aliasing distortion caused by the adaptive filter that occurs at line areas.
以上説明したように、本実施例によれば輝度信号によっ
て色差フィルタを適応的に切替えることにより、画質を
向上させることができる。As described above, according to this embodiment, image quality can be improved by adaptively switching the color difference filters based on the luminance signal.
第４図は本発明の第３の実施例である間引きフィルタ装
置のブロック図である。同図において、■は輝度人力信
号、２０は輝度フィルタ、２１は輝度フィルタ信号、２
２はメモリ、２３はメモリ出力信号、４はフィルタ選択
器、５はフィルタ選択信号、６は色差入力信号、２４は
メモリ、２５は遅延信号、２６は色差フィルタ、１０は
間引き信号である。FIG. 4 is a block diagram of a thinning filter device according to a third embodiment of the present invention. In the same figure, ■ is a brightness human input signal, 20 is a brightness filter, 21 is a brightness filter signal, 2
2 is a memory, 23 is a memory output signal, 4 is a filter selector, 5 is a filter selection signal, 6 is a color difference input signal, 24 is a memory, 25 is a delay signal, 26 is a color difference filter, and 10 is a thinning signal.
以上のように構成された本実施例の間引きフィルタ装置
について、以下その動作を説明する。本実施例の輝度フ
ィルタ２０は第２の実施例の輝度フィルタの破線で囲ま
れた内部の動作をし、色差フィルタ２６は第２の実施例
の色差フィルタの破線で囲まれた内部と同し動作を行な
う。第２の実施例では複数の輝度フィルタが必要である
が、異なる位置の色差信号の間引き処理を行なうために
、同し位置の輝度信号に同し輝度フィルタ処理が必要な
場合がある。そのような場合に繰り返し同じ輝度フィル
タ処理を行なうことは無駄であり、−４ｙ輝度フィルタ
をかけて処理した輝度信号を、−時的にメモリに保存し
、後で繰り返し読み出すことによって輝度フィルタ処理
を削減することができる。２２は輝度フィルタをかけた
輝度信号を一時的に記憶するメモリであり、メモリ出力
信号２３によってフィルタ選択器４で色差フィルタが選
択される。色差入力信号６はメモリ２４でメモリ２２及
びフィルタ選択器３で処理されるのに必要な時間だけ遅
延され、色差フィルタ２６に入力される。色差フィルタ
２６は、選択信号５で示された色差フィルタで処理した
後、間引かれて間引き信号１０となる。The operation of the thinning filter device of this embodiment configured as described above will be described below. The luminance filter 20 of this embodiment operates in the same manner as the interior surrounded by the broken line of the luminance filter of the second embodiment, and the color difference filter 26 operates the same as the interior surrounded by the dashed line of the color difference filter of the second embodiment. Perform the action. In the second embodiment, a plurality of luminance filters are required, but in order to thin out color difference signals at different positions, the same luminance filter processing may be necessary for luminance signals at the same position. In such a case, it is wasteful to repeatedly perform the same luminance filter processing, and the luminance signal processed by applying the -4y luminance filter is temporarily stored in memory and read out repeatedly later to perform the luminance filter processing. can be reduced. Reference numeral 22 denotes a memory that temporarily stores the luminance signal subjected to the luminance filter, and a color difference filter is selected by the filter selector 4 according to the memory output signal 23. The color difference input signal 6 is delayed in the memory 24 by the time necessary for processing in the memory 22 and the filter selector 3, and then input to the color difference filter 26. The color difference filter 26 is processed by the color difference filter indicated by the selection signal 5 and then thinned out to become a thinned signal 10.
以上説明したように、本実施例によればメモリ２２に輝
度フィルタ処理信号を一時的に記憶し、輝度フィルタの
処理回数を削減することによって第２の実施例のハード
ウェア規模を削減することができる。As explained above, according to the present embodiment, the hardware scale of the second embodiment can be reduced by temporarily storing the luminance filter processed signal in the memory 22 and reducing the number of luminance filter processes. can.
なお、第１および第２の実施例において、輝度フィルタ
および色差フィルタを２種類としたが、３種類以上にし
てもよく、また、輝度フィルタと色差フィルタの数を同
しにする必要はない。また、第２の実施例で誤差計算器
を２個としたが、誤差計算器を３個以上にしてもよく、
輝度フィルタ２ａから２ｄの処理で共用化できるものは
一部を共用化してもよい。In the first and second embodiments, there are two types of brightness filters and color difference filters, but there may be three or more types, and it is not necessary to use the same number of brightness filters and color difference filters. Further, although the second embodiment uses two error calculators, the number of error calculators may be three or more.
If the processing of the brightness filters 2a to 2d can be shared, some of them may be shared.
発明の詳細
な説明したように、本発明によれば、比較的簡単なハー
ドウェア構成で色差信号の補間歪を低減することができ
、その実用的効果は大きい。As described in detail, according to the present invention, interpolation distortion of color difference signals can be reduced with a relatively simple hardware configuration, and its practical effects are significant.
第１図は本発明における一実施例の間引きフィルタ装置
のブロック図、第２図は本発明の詳細な説明するための
説明図、第３図は本発明の他の実４・
施例の間引きフィルタ装置のブロック図、第４は本発明
の他の実施例の間引きフィルタ装置のブロック図である
。
２・・・・・・輝度フィルタ、４・・・・・・フィルタ
選択器、７・・・・・・色差フィルタ、９・・・・・・
選択器。
代理人の氏名 弁理士 小鍜治 明 ほか２名Ｉｌ＆１
図
ｊｉ２図
（勾
（ｂ）（リ （向第
３図
Ｌ
。
蕗４図FIG. 1 is a block diagram of a thinning filter device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining the present invention in detail, and FIG. 3 is a block diagram of a thinning filter device according to another embodiment of the present invention. A fourth block diagram of a filter device is a block diagram of a thinning filter device according to another embodiment of the present invention. 2...Brightness filter, 4...Filter selector, 7...Color difference filter, 9...
Selector. Name of agent: Patent attorney Akira Okaji and two others Il & 1
Figure ji2 (gradient
(b)
. Fushimi 4
Claims (3)
限を行なって位置Ｘの色差画素間引きを行なう少なくと
も２種類の色差信号間引き手段と、輝度信号の位置Ｘの
近傍の少なくとも２つの輝度画素からなる画素グループ
Ｙをその周辺画素から補間生成する各々少なくとも２種
類の輝度補間手段と、前記輝度補間手段で補間生成され
た画素グループＹの各画素値を画素グループＹの各画素
の真値と比較してその差の関数で輝度補間手段の組合せ
を選択する補間手法選択手段と、前記補間手法選択手段
で選択された輝度補間手段の組合せと一意的に対応する
色差間引き手法で位置Ｘの色差信号を間引きする色差間
引き手段を備え、間引きされた色差信号を出力する事を
特徴とする間引きフィルタ装置。(1) At least two types of color difference signal thinning means that perform frequency band limitation on the color difference signal of the image input signal and thin out color difference pixels at position X, and at least two luminance pixels near position X of the luminance signal. at least two types of brightness interpolation means each for generating a pixel group Y by interpolation from its surrounding pixels, and each pixel value of the pixel group Y interpolated and generated by the brightness interpolation means as the true value of each pixel of the pixel group interpolation method selection means for comparing and selecting a combination of luminance interpolation means based on a function of the difference; and a color difference thinning method that uniquely corresponds to the combination of luminance interpolation means selected by the interpolation method selection means to determine the color difference at position X. A thinning filter device comprising a color difference thinning means for thinning out a signal, and outputting a thinned color difference signal.
限を行なって位置Ｘの色差画素間引きを行なう少なくと
も２種類の色差信号間引き手段と、輝度信号の位置Ｘ画
素値Ａの画素をその周辺画素から補間生成する少なくと
も２種類の輝度補間手段と、前記輝度補間手段で補間生
成された各画素値を画素値Ａと比較してその差の関数で
輝度補間手段を選択する補間手法選択手段と、前記補間
手法選択手段で選択された輝度補間手段と一意的に対応
する色差間引き手法で位置Ｘの色差信号を間引きする色
差間引き手段を備え、間引きされた色差信号を出力する
事を特徴とする間引きフィルタ装置。(2) At least two types of color difference signal thinning means for performing frequency band limitation on the color difference signal of the image input signal and thinning out color difference pixels at position at least two types of brightness interpolation means that interpolate and generate from pixels; and an interpolation method selection means that compares each pixel value interpolated and generated by the brightness interpolation means with a pixel value A and selects a brightness interpolation means based on a function of the difference. , comprising a color difference thinning means for thinning out the color difference signal at position X using a color difference thinning method uniquely corresponding to the luminance interpolation means selected by the interpolation method selection means, and outputting the thinned out color difference signal. Thinning filter device.
モリに記憶し、前記メモリから読み出した輝度信号の補
間信号を補間手法選択信号の入力信号とする請求項（１
）または（２）記載の間引きフィルタ装置。(3) The luminance signal interpolated by the luminance interpolation means is temporarily stored in a memory, and the interpolation signal of the luminance signal read from the memory is used as the input signal of the interpolation method selection signal (1).
) or the thinning filter device described in (2).
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30738690A JP2532742B2 (en) | 1990-11-13 | 1990-11-13 | Thinning filter device |
| US07/738,140 US5323232A (en) | 1990-08-01 | 1991-07-30 | Filter device for decimation and interpolation of chrominance components of a video signal |
| DE69126176T DE69126176D1 (en) | 1990-08-01 | 1991-07-31 | Filter holder for decimating and interpolating chrominance components of a video signal |
| EP91307027A EP0469892B1 (en) | 1990-08-01 | 1991-07-31 | Filter device for decimation and interpolation of chrominance components of a video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30738690A JP2532742B2 (en) | 1990-11-13 | 1990-11-13 | Thinning filter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04178094A true JPH04178094A (en) | 1992-06-25 |
| JP2532742B2 JP2532742B2 (en) | 1996-09-11 |
Family
ID=17968429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30738690A Expired - Fee Related JP2532742B2 (en) | 1990-08-01 | 1990-11-13 | Thinning filter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2532742B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993019625A1 (en) | 1992-03-27 | 1993-10-14 | Otsuka Pharmaceutical Co., Ltd | Health drink composition |
| JP2011166623A (en) * | 2010-02-12 | 2011-08-25 | Nippon Hoso Kyokai <Nhk> | Signal correction apparatus, coding device, decoding device and program |
| JP2016523056A (en) * | 2013-05-14 | 2016-08-04 | フラウンホッファー−ゲゼルシャフト ツァ フェルダールング デァ アンゲヴァンテン フォアシュンク エー．ファオ | Chroma subsampling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60145786A (en) * | 1984-01-10 | 1985-08-01 | Toshiba Corp | Noise suppression circuit of color video signal |
-
1990
- 1990-11-13 JP JP30738690A patent/JP2532742B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60145786A (en) * | 1984-01-10 | 1985-08-01 | Toshiba Corp | Noise suppression circuit of color video signal |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993019625A1 (en) | 1992-03-27 | 1993-10-14 | Otsuka Pharmaceutical Co., Ltd | Health drink composition |
| JP2011166623A (en) * | 2010-02-12 | 2011-08-25 | Nippon Hoso Kyokai <Nhk> | Signal correction apparatus, coding device, decoding device and program |
| JP2016523056A (en) * | 2013-05-14 | 2016-08-04 | フラウンホッファー−ゲゼルシャフト ツァ フェルダールング デァ アンゲヴァンテン フォアシュンク エー．ファオ | Chroma subsampling |
| US9916645B2 (en) | 2013-05-14 | 2018-03-13 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Chroma subsampling |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2532742B2 (en) | 1996-09-11 |
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