JPH05207430A - Scanning conversion system - Google Patents
Scanning conversion systemInfo
- Publication number
- JPH05207430A JPH05207430A JP4010428A JP1042892A JPH05207430A JP H05207430 A JPH05207430 A JP H05207430A JP 4010428 A JP4010428 A JP 4010428A JP 1042892 A JP1042892 A JP 1042892A JP H05207430 A JPH05207430 A JP H05207430A
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- Prior art keywords
- signal
- scanning
- scan
- filter
- circuit
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は画像信号の走査変換方式
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scan conversion system for image signals.
【０００２】[0002]
【従来の技術】現在、飛び越し走査から順次走査への変
換はクリアビジョン受信機により実現されており、動き
量を検出して以下の動画時，静止画時に対応した信号処
理により得られる順次走査信号を切り替えている。2. Description of the Related Art At present, conversion from interlaced scanning to progressive scanning is realized by a clear vision receiver, and a progressive scanning signal obtained by detecting the amount of motion and performing signal processing corresponding to the following moving images and still images. Are switching.
【０００３】まず動画時に対応した順次走査への変換は
図８に示す構成によって実現されている。即ち飛び越し
走査の入力画像信号６５は、フィルタ回路１４において
垂直方向の１次元フィルタが施されることで画像信号６
５の走査線の間の位相の画素値が内挿され、信号６６と
して出力される。フィルタ回路１４の構成としては、例
えば２本の走査線の信号を入力として、その垂直方向の
平均値を出力させる。信号６５および信号６６はそれぞ
れ倍速変換回路１５，１６に入力され、各々、２倍の速
度に変換されて信号６７，６８となる。選択回路１７に
おいて順次走査の１走査線毎に切り替わる選択信号６９
によって、信号６７と信号６８を切り替えて順次走査信
号７０が出力される。信号７０は、信号６５の走査線位
置と一致した位相では信号６５の値そのものとなり、信
号６５の走査線の間の位相ではフィルタ回路１４の出力
の値となっている。順次走査信号で表現可能な垂直信号
帯域をｆ１とするとき、以上の処理からなる走査変換の
フィルタ特性は、一例として図９に示すようなｆ１／２
をカットオフ値とする特性となる。First, conversion to progressive scanning corresponding to moving images is realized by the configuration shown in FIG. That is, the interlaced scanning input image signal 65 is subjected to a vertical one-dimensional filter in the filter circuit 14 to obtain the image signal 6
The pixel values of the phases between the five scanning lines are interpolated and output as a signal 66. As a configuration of the filter circuit 14, for example, signals of two scanning lines are input and an average value in the vertical direction is output. The signals 65 and 66 are input to the double speed conversion circuits 15 and 16, respectively, and converted into double speed to become signals 67 and 68, respectively. In the selection circuit 17, a selection signal 69 which is switched for each scanning line of sequential scanning
Thus, the signal 67 and the signal 68 are switched to sequentially output the scanning signal 70. The signal 70 has the value itself of the signal 65 in the phase that coincides with the scanning line position of the signal 65, and has the value of the output of the filter circuit 14 in the phase between the scanning lines of the signal 65. Assuming that the vertical signal band that can be represented by the progressive scanning signal is f1, the scan conversion filter characteristic of the above processing is f1 / 2 as shown in FIG. 9 as an example.
Has a cutoff value.
【０００４】また静止画時に対応した順次走査への変換
は多くの場合、図８の構成でフィルタ回路１４の機能の
みを、１フィールド前の画素値を信号６６として出力す
るものに変更したものとなっている。In many cases, conversion to progressive scanning corresponding to a still image is such that only the function of the filter circuit 14 is changed to output the pixel value one field before as the signal 66 in the configuration of FIG. Is becoming
【０００５】[0005]
【発明が解決しようとする課題】上述の従来技術におい
ては、動画時の画質と静止画時の画質の差が大きくなる
ために、静止画と動画の切り替わり時点での先鋭度が大
きく変化するという欠点がある。また、静止画処理から
動画処理、あるいは動画処理から静止処理への切り替わ
りが頻繁に発生すると、ちらつきとなって画質の劣化を
引き起こすという欠点がある。In the above-mentioned prior art, since the difference between the image quality of a moving image and the image quality of a still image becomes large, the sharpness at the time of switching between the still image and the moving image changes greatly. There are drawbacks. Further, if the switching from the still image processing to the moving image processing or the switching from the moving image processing to the still processing occurs frequently, there is a drawback that flicker causes deterioration of image quality.
【０００６】本発明の目的は、このような従来方式の欠
点を緩和せしめ、順次走査に変換された画像信号の画質
を向上することが可能な走査変換方式を提供することで
ある。An object of the present invention is to provide a scan conversion system capable of alleviating the drawbacks of the conventional system and improving the image quality of an image signal converted into progressive scanning.
【０００７】[0007]
【課題を解決するための手段】本発明の第１の走査変換
方式は、飛び越し走査の原画像信号を順次走査に変換す
る走査変換方式であって、順次走査の走査線間隔で表現
可能な垂直信号帯域がｆ１である場合に、前記原画像信
号に対して０内挿を施すことにより順次走査化した信号
に対して、ｆ１／２よりも広い通過帯域を有する垂直低
減通過型フィルタを施すことで順次走査の画像信号に変
換するものである。A first scan conversion system of the present invention is a scan conversion system for converting an interlaced scan original image signal into a sequential scan, and is a vertical scan line which can be expressed by a scanning line interval of the sequential scan. When the signal band is f1, a vertical reduction pass filter having a pass band wider than f1 / 2 is applied to a signal which is sequentially scanned by performing 0 interpolation on the original image signal. To convert the image signal into a progressive scan image signal.
【０００８】本発明の第２の走査変換方式は、飛び越し
走査の原画像信号を順次走査に変換する走査変換方式で
あって、前記原画像信号に対して０内挿を施すことによ
り順次走査化した信号に対して、水平方向に高い周波数
を有する信号成分ほど垂直・時間空間において広い通過
帯域を有する低減通過型フィルタを施すことで順次走査
の画像信号に変換するものである。A second scan conversion method of the present invention is a scan conversion method for converting an original image signal of interlaced scanning into a sequential scan, and the original image signal is sequentially scanned by performing 0 interpolation. The signal is converted into a progressive scanning image signal by applying a reduction pass filter having a wider pass band in the vertical / time space for a signal component having a higher frequency in the horizontal direction.
【０００９】本発明の第３の走査変換方式は、飛び越し
走査の原画像信号を順次走査に変換する走査変換方式で
あって、前記原画像信号から画像の動き量を検出し、上
記の第１または第２の走査変換方式により得られる順次
走査信号を動画時の順次走査信号として用いるものであ
る。A third scan conversion system of the present invention is a scan conversion system for converting an interlaced scan original image signal into a sequential scan, and detecting the motion amount of the image from the original image signal, Alternatively, a progressive scan signal obtained by the second scan conversion method is used as a progressive scan signal in a moving image.
【００１０】[0010]
【作用】本発明の第１の走査変換方式は、飛び越し走査
の信号に対して０内挿を施して順次走査化した信号に対
して、一例として図７に示すような、順次走査の走査線
間隔で表現可能な垂直信号帯域（ｆ１）の１／２よりも
広い通過帯域（ｆ２）を有する垂直低減通過型フィルタ
を施すことで、順次走査の画像信号に変換する。飛び越
し走査の原信号でフィールド内で表現可能な垂直信号帯
域はｆ１／２であり、ｆ１／２までの信号帯域を有効に
利用することが望ましいが、従来技術のフィルタではロ
ールオフ値を０とすることができず、従ってｆ１／２以
下の信号帯域なおいてもゲインが１以下になる部分が出
ることが避けられなかった。本発明ではフィルタの通過
帯域をｆ１／２よりも広くすることで、ｆ１／２以上の
歪み成分が多く含まれることになるものの、ｆ１／２以
下の信号帯域のゲインを大きく減衰させることなく有効
利用することが可能になる。また、この歪み成分は視覚
的には先鋭度を向上させる方向に働くため、大きな画質
劣化とならないようにフィルタの通過帯域を選ぶことは
可能である。従って本発明によれば、従来方式に比較し
て動画時の画質が改善されることになる。According to the first scan conversion method of the present invention, the interlaced scanning signal is subjected to 0 interpolation to be progressively scanned so that the progressive scanning line as shown in FIG. By applying a vertical reduction pass filter having a pass band (f2) wider than 1/2 of the vertical signal band (f1) that can be expressed by the intervals, it is converted into a progressive scan image signal. The vertical signal band that can be represented in the field by the interlaced scanning original signal is f1 / 2, and it is desirable to effectively use the signal band up to f1 / 2, but in the filter of the conventional technique, the roll-off value is set to 0. Therefore, it is unavoidable that there is a portion where the gain is 1 or less even in the signal band of f1 / 2 or less. In the present invention, by making the pass band of the filter wider than f1 / 2, many distortion components of f1 / 2 or more are included, but it is effective without significantly attenuating the gain of the signal band of f1 / 2 or less. It becomes possible to use. Further, since this distortion component visually acts in the direction of improving the sharpness, it is possible to select the pass band of the filter so as not to cause a large deterioration in image quality. Therefore, according to the present invention, the image quality during a moving image is improved as compared with the conventional method.
【００１１】本発明の第２の走査変換方式は、飛び越し
走査の信号に対して０内挿を施して順次走査化した信号
に対して、水平方向に高い周波数を有する信号成分ほど
垂直・時間空間において広い通過帯域を有する低減通過
型フィルタを施すことで順次走査の画像信号に変換す
る。一般に上記のｆ１／２以上の歪み成分は、水平方向
低周波成分ほど視覚的に目立ち易い。従って、水平方向
の低周波成分ほどフィルタの通過帯域を狭く設定して視
覚的な劣化成分を除去し、かつ水平方向高周波成分ほど
フィルタの通過帯域を広く設定することで、従来方式の
動画時に比較して画質を向上することが可能となる。According to the second scan conversion method of the present invention, a signal component having a higher frequency in the horizontal direction is added to the vertical / temporal space of a signal obtained by subjecting an interlaced scan signal to 0 interpolation to sequentially scan the signal. In step 1, a reduction pass filter having a wide pass band is applied to convert the image signal into progressive scan image signals. Generally, the above-mentioned distortion component of f1 / 2 or more is visually more noticeable as the horizontal low-frequency component. Therefore, the lower the horizontal frequency component, the narrower the pass band of the filter is to remove the visual deterioration component, and the higher the horizontal frequency component is, the wider the filter pass band is. It is possible to improve the image quality.
【００１２】本発明の第３の走査変換方式は、飛び越し
走査の原画像信号から画像の動き量を検出し、上記の第
１または第２の走査変換方式により得られる順次走査信
号を動画時の順次走査信号として用いる。上述のように
本発明の第１または第２の走査変換方式によって得られ
る順次走査信号は、従来技術の動画時に比較して画質が
向上しているため、静止画時の順次走査信号との画質差
は小さくなっている。従って従来技術に比較して、静止
画処理から動画処理、あるいは動画処理から静止画処理
への切り替わりによる画質の劣化を低減することが可能
となる。According to a third scan conversion method of the present invention, an amount of motion of an image is detected from an original image signal of interlaced scanning, and a progressive scan signal obtained by the above-mentioned first or second scan conversion method is used for moving images. It is used as a progressive scanning signal. As described above, since the image quality of the progressive scan signal obtained by the first or second scan conversion method of the present invention is improved as compared with that in the moving image of the conventional technique, the image quality with the progressive scan signal in the still image is improved. The difference is getting smaller. Therefore, it is possible to reduce deterioration of image quality due to switching from still image processing to moving image processing or from moving image processing to still image processing, as compared with the related art.
【００１３】[0013]
【実施例】次に図１から図８を参照して本発明の実施例
について説明する。Embodiments of the present invention will now be described with reference to FIGS.
【００１４】まず、本発明の第１の走査変換方式の一実
施例について説明する。図５はその走査変換方式を実施
する回路の基本構成を示すブロック図である。飛び越し
走査の画像信号８０は倍速変換回路１８に入力され、２
倍の早さに変換されて、順次走査の１走査線おきの間隔
で信号８１として出力される。選択回路１９において、
信号８１とゼロ信号を順次走査の１走査線毎に切り替わ
る選択信号８４により切り替えてゼロ内挿信号８２とす
る。ゼロ内挿信号８２は、ゼロ信号と２倍速の入力画像
信号が１走査線毎に交互になった順次走査信号である。
ゼロ内挿信号８２に対して、一例として図７に示す特性
のフィルタを垂直方向に施すことで内挿処理を行い、順
次走査信号８３が出力される。図７の特性では、ｆ１／
２のゲインが０．８以上となり、図９に示した従来方式
の特性よりも減衰の程度が小さくなっている。First, an embodiment of the first scan conversion system of the present invention will be described. FIG. 5 is a block diagram showing the basic configuration of a circuit that implements the scan conversion method. The interlaced scanning image signal 80 is input to the double speed conversion circuit 18,
It is converted into a signal of double speed, and is output as a signal 81 at intervals of every other scanning line of sequential scanning. In the selection circuit 19,
The signal 81 and the zero signal are switched by the selection signal 84 which is switched for each scanning line of the sequential scanning to form the zero interpolation signal 82. The zero interpolation signal 82 is a sequential scanning signal in which the zero signal and the double-speed input image signal alternate every scanning line.
The zero interpolation signal 82 is subjected to interpolation processing by applying a filter having the characteristic shown in FIG. 7 in the vertical direction, for example, and a scanning signal 83 is sequentially output. In the characteristic of FIG. 7, f1 /
The gain of 2 is 0.8 or more, and the degree of attenuation is smaller than the characteristic of the conventional method shown in FIG.
【００１５】図６に倍速変換回路１８の一例を示す。入
力信号７１は記憶回路１１，１２に入力される。書き込
み制御信号７２，７４が各々記憶回路１１，１２に入力
され、飛び越し走査の１走査線毎に例えば奇数番目の走
査線の信号は記憶回路１１に、偶数番目の走査線の信号
は記憶回路１２に記憶される。記憶回路１１，１２は、
その一方が書き込み状態の場合には他方が読み出し状態
となるように書き込み制御信号７２，７４および読み出
し制御信号７３，７５により制御する。読み出し動作を
書き込み動作の２倍の早さで処理することで倍速変換が
実現される。記憶回路１１，１２から倍速で読み出され
た信号７６，７７を選択回路１３において順次走査の１
走査線毎に切り替わる選択信号７８により切り替えて出
力することで倍速信号７９が得られる。FIG. 6 shows an example of the double speed conversion circuit 18. The input signal 71 is input to the memory circuits 11 and 12. The write control signals 72 and 74 are input to the memory circuits 11 and 12, respectively, and for each scan line of the interlaced scanning, for example, the signal of the odd-numbered scan line is stored in the memory circuit 11, and the signal of the even-numbered scan line is stored in the memory circuit 12. Memorized in. The memory circuits 11 and 12 are
When one of them is in the writing state, the other is in the reading state by controlling the writing control signals 72 and 74 and the reading control signals 73 and 75. Double speed conversion is achieved by processing the read operation twice as fast as the write operation. The signals 76 and 77 read out at double speed from the storage circuits 11 and 12 are sequentially scanned by the selection circuit 13
A double speed signal 79 is obtained by switching and outputting the selection signal 78 which is switched for each scanning line.
【００１６】図４にフィルタ回路２０の一例を示す。入
力信号６３は乗算器ｇ１と記憶回路ｄ２に入力される。
記憶回路ｄｊの出力は乗算器ｇｊと記憶回路ｄｊ＋１に
入力される。（ｊ＝２，３，…，ｎ）。ここで記憶回路
ｄｊは１走査線分のＦＩＦＯ構成であるとする。乗算器
ｇ１，ｇ２，…，ｇｎの出力が加算器１０で加算された
ものがフィルタ出力６４となる。なお、各乗算器では入
力信号に対してある固定の定数（フィルタ係数）を乗算
したものを出力する。図４の構成によってｎタップの垂
直方向フィルタが構成される。FIG. 4 shows an example of the filter circuit 20. The input signal 63 is input to the multiplier g1 and the storage circuit d2.
The output of the storage circuit dj is input to the multiplier gj and the storage circuit dj + 1. (J = 2, 3, ..., N). Here, it is assumed that the memory circuit dj has a FIFO structure for one scanning line. The outputs of the multipliers g1, g2, ..., Gn are added by the adder 10 to form the filter output 64. In each multiplier, the input signal is multiplied by a fixed constant (filter coefficient) and output. The configuration of FIG. 4 constitutes an n-tap vertical filter.
【００１７】以上が図５に示した実施例の説明である。
図５では実際にゼロ内挿処理を施してからフィルタを施
す構成を示したが、図１に示す走査変換回路１００によ
っても第１の走査変換方式を実現できる。即ち図１の構
成では、飛び越し走査の走査線位置と一致した位相の出
力を得るフィルタ回路１と、走査線の間の位相の出力を
得るフィルタ回路２を並列に動作させる。まず、飛び越
し走査の画像信号５０をフィルタ回路１，２に入力す
る。フィルタ回路１により画像信号５０の走査線位置と
一致した位相の出力を得、フィルタ回路２により走査線
の間の位相の出力を得る。次にフィルタ出力信号５１，
５２を倍速変換回路３，４において倍速変換して倍速信
号５３，５４を得る。倍速信号５３，５４は、選択回路
５において順次走査の１走査線毎に切り替わる選択信号
５５により切り替えて順次走査の画像信号５６を得る。
ただし、順次走査信号で表現可能な垂直信号帯域をｆ１
とするとき、フィルタ回路１，２の総合特性、即ち走査
変換回路１００における内挿フィルタの特性を、例えば
図７に示すようにｆ１／２よりも通過帯域が広くなるよ
うにする。The above is the description of the embodiment shown in FIG.
Although FIG. 5 shows the configuration in which the filter is actually subjected to the zero interpolation process and then the filter is performed, the scan conversion circuit 100 shown in FIG. 1 can also realize the first scan conversion method. That is, in the configuration of FIG. 1, the filter circuit 1 that obtains the output of the phase that matches the scanning line position of the interlaced scanning and the filter circuit 2 that obtains the output of the phase between the scanning lines are operated in parallel. First, the interlaced scanning image signal 50 is input to the filter circuits 1 and 2. The filter circuit 1 obtains an output having a phase that matches the scanning line position of the image signal 50, and the filter circuit 2 obtains an output having a phase between the scanning lines. Then the filter output signal 51,
Double speed conversion of 52 is performed in double speed conversion circuits 3 and 4 to obtain double speed signals 53 and 54. The double speed signals 53 and 54 are switched by the selection signal 55 that is switched for each scanning line of the sequential scanning in the selection circuit 5 to obtain the image signal 56 of the sequential scanning.
However, the vertical signal band that can be represented by the progressive scan signal is f1.
In this case, the overall characteristics of the filter circuits 1 and 2, that is, the characteristics of the interpolation filter in the scan conversion circuit 100 are set so that the pass band is wider than f1 / 2 as shown in FIG. 7, for example.
【００１８】次に本発明の第２の走査変換方式の一実施
例について説明する。ここでは一例として水平方向に２
個の帯域に分割する場合について説明するが２個以上で
あっても同様にして構成できる。図２はその走査変換方
式を実施する回路の基本構成を示すブロック図である。
飛び越し走査の画像信号５７は、まず帯域分割回路６に
おいて、水平方向に２個の帯域に分割される。帯域分割
は公知の従来技術によって行えばよい。水平低域成分を
信号５８、高域成分を信号５９とし、各々走査変換回路
７，８に入力して各々順次走査へ変換する。走査変換回
路７，８の構成は図１の走査変換回路１００と同じ構成
でよい。ただし、フィルタ特性のみを走査変換回路７の
フィルタの通過帯域を、走査変換回路８のフィルタの通
過帯域よりも狭くなるように設定する。このようにする
ことで、妨害の目立ち易い水平低域成分において歪み成
分を除去し、水平高域成分において先鋭度を向上させる
ことが可能となる。Next, one embodiment of the second scan conversion system of the present invention will be described. Here, as an example, 2 in the horizontal direction
Although the case where the band is divided into a plurality of bands will be described, the same configuration can be made even when there are two or more bands. FIG. 2 is a block diagram showing the basic configuration of a circuit that implements the scan conversion method.
The interlaced scanning image signal 57 is first divided into two bands in the horizontal direction by the band division circuit 6. Band division may be performed by a known conventional technique. The horizontal low-frequency component is the signal 58, and the high-frequency component is the signal 59, which are input to the scan conversion circuits 7 and 8 and converted into progressive scanning. The scan conversion circuits 7 and 8 may have the same configuration as the scan conversion circuit 100 of FIG. However, only the filter characteristic is set so that the pass band of the filter of the scan conversion circuit 7 is narrower than the pass band of the filter of the scan conversion circuit 8. By doing so, it becomes possible to remove the distortion component in the horizontal low-frequency component where interference is easily noticeable and improve the sharpness in the horizontal high-frequency component.
【００１９】なお、水平低域成分を扱う走査変換回路７
については従来技術で示した図８の構成で実現してもよ
い。また、走査変換回路７，８は垂直・時間空間の２次
元フィルタで実現してもよい。The scan conversion circuit 7 that handles the horizontal low-frequency component
May be realized by the configuration of FIG. 8 shown in the related art. Further, the scan conversion circuits 7 and 8 may be realized by a two-dimensional filter in the vertical / temporal space.
【００２０】次に本発明の第３の走査変換方式の一実施
例について説明する。ここでは一例として動画時の順次
走査変換を図１で説明した第１の走査変換方式により実
現する場合について説明するが、第２の走査変換方式で
実現してもよい。図３はその走査変換方式を実施する回
路の基本構成を示すブロック図である。飛び越し走査の
画像信号８９は走査変換回路２１，２２および動き検出
回路２３に入力される。走査変換回路２１においては、
図１の走査変換回路１００と全く同じ構成で動画時順次
走査信号８５を生成する。走査変換回路２２はフィルタ
回路１４以外は図８を用いて説明した従来技術と全く同
じ回路構成となり、フィルタ回路１４の機能を１フィー
ルド前の画素値を挿入することで順次走査化するものに
変更し、静止画時順次走査信号８６を生成する。動き検
出回路２３では１フレーム差分の絶対値を動き量信号８
７として出力する。混合回路２４において、動き量信号
８７により動画時順次走査信号８５と静止画時順次走査
信号８６を混合して順次走査信号８８を出力する。この
ようにすることで、第１または第２の走査変換方式に比
較して静止画における画質が向上する。ただし従来技術
に比較して、静止画時と動画時の画質差は小さい。Next, an embodiment of the third scan conversion system of the present invention will be described. Here, as an example, a case is described in which progressive scan conversion at the time of moving image is realized by the first scan conversion method described in FIG. 1, but it may be realized by the second scan conversion method. FIG. 3 is a block diagram showing the basic configuration of a circuit that implements the scan conversion method. The interlaced-scan image signal 89 is input to the scan conversion circuits 21 and 22 and the motion detection circuit 23. In the scan conversion circuit 21,
With the same configuration as the scan conversion circuit 100 of FIG. 1, the progressive scan signal 85 for moving images is generated. The scan conversion circuit 22 has the same circuit configuration as that of the conventional technique described with reference to FIG. 8 except for the filter circuit 14, and the function of the filter circuit 14 is changed to one in which scanning is sequentially performed by inserting a pixel value of one field before. Then, the sequential scanning signal 86 for the still image is generated. In the motion detection circuit 23, the absolute value of one frame difference is used as the motion amount signal 8
Output as 7. In the mixing circuit 24, the moving image sequential scanning signal 85 and the still image progressive scanning signal 86 are mixed by the motion amount signal 87, and the sequential scanning signal 88 is output. By doing so, the image quality of a still image is improved as compared with the first or second scan conversion method. However, the image quality difference between a still image and a moving image is smaller than that in the conventional technique.
【００２１】[0021]
【発明の効果】以上述べてきたように本発明によれば、
動画時の画質が向上し、さらに静止画処理から動画処
理、あるいは動画処理から静止画処理への切り替わりに
よる画質の劣化を低減することが可能となる。As described above, according to the present invention,
It is possible to improve the image quality at the time of moving image and further reduce the deterioration of image quality due to switching from still image processing to moving image processing or moving image processing to still image processing.
【図１】本発明の第１の走査変換方式の一実施例の基本
構成を示すブロック図である。FIG. 1 is a block diagram showing a basic configuration of an embodiment of a first scan conversion system of the present invention.
【図２】本発明の第２の走査変換方式の一実施例の基本
構成を示すブロック図である。FIG. 2 is a block diagram showing a basic configuration of an embodiment of a second scan conversion system of the present invention.
【図３】本発明の第３の走査変換方式の一実施例の基本
構成を示すブロック図である。FIG. 3 is a block diagram showing a basic configuration of an embodiment of a third scan conversion system of the present invention.
【図４】本発明の一実施例におけるフィルタ回路の構成
例を示す図である。FIG. 4 is a diagram showing a configuration example of a filter circuit according to an embodiment of the present invention.
【図５】本発明の第１の走査変換方式の一実施例の基本
構成を示すブロック図である。FIG. 5 is a block diagram showing a basic configuration of an embodiment of a first scan conversion system of the present invention.
【図６】本発明の一実施例における倍速変換回路の構成
例を示す図である。FIG. 6 is a diagram showing a configuration example of a double speed conversion circuit in an embodiment of the present invention.
【図７】本発明の一実施例における走査変換回路のフィ
ルタ特性を示す図である。FIG. 7 is a diagram showing a filter characteristic of a scan conversion circuit according to an embodiment of the present invention.
【図８】従来の走査変換方式の基本構成を示すブロック
図である。FIG. 8 is a block diagram showing a basic configuration of a conventional scan conversion system.
【図９】従来の走査変換回路におけるフィルタ特性の一
例を示す図である。FIG. 9 is a diagram showing an example of filter characteristics in a conventional scan conversion circuit.
１，２，１４，２０ フィルタ回路 ３，４，１５，１６，１８ 倍速変換回路 ５，１３，１７，１９ 選択回路 ６ 帯域分割回路 ７，８，２１，２２，１００ 走査変換回路 ９，１０ 加算器 ２３ 動き検出回路 ２４ 混合回路 １１，１２，ｄ２，…，ｄｎ 記憶回路 ｇ１，ｇ２，…，ｇｎ 乗算器 1, 2, 14, 20 Filter circuit 3, 4, 15, 16, 18 Double speed conversion circuit 5, 13, 17, 19 Selection circuit 6 Band division circuit 7, 8, 21, 22, 100 Scan conversion circuit 9, 10 Addition 23 Motion detection circuit 24 Mixing circuit 11, 12, d2, ..., dn Storage circuit g1, g2, ..., gn Multiplier
Claims (3)
換する走査変換方式であって、順次走査の走査線間隔で
表現可能な垂直信号帯域がｆ１である場合に、前記原画
像信号に対して０内挿を施すことにより順次走査化した
信号に対して、ｆ１／２よりも広い通過帯域を有する垂
直低減通過型フィルタを施すことで順次走査の画像信号
に変換することを特徴とする走査変換方式。1. A scan conversion method for converting an interlaced scanning original image signal into progressive scanning, wherein a vertical signal band that can be represented by a scanning line interval of progressive scanning is f1 with respect to the original image signal. Scanning characterized in that a signal which has been sequentially scanned by performing 0 interpolation is converted to an image signal of progressive scanning by applying a vertical reduction pass filter having a pass band wider than f1 / 2. Conversion method.
換する走査変換方式であって、前記原画像信号に対して
０内挿を施すことにより順次走査化した信号に対して、
水平方向に高い周波数を有する信号成分ほど垂直・時間
空間において広い通過帯域を有する低減通過型フィルタ
を施すことで順次走査の画像信号に変換することを特徴
とする走査変換方式。2. A scan conversion method for converting an interlaced scanning original image signal into progressive scanning, wherein a signal is progressively scanned by performing 0 interpolation on the original image signal,
A scan conversion method characterized in that a signal component having a higher frequency in the horizontal direction is converted into a progressive scan image signal by applying a reduction pass filter having a wider pass band in the vertical / time space.
換する走査変換方式であって、前記原画像信号から画像
の動き量を検出し、請求項１または２記載の走査変換方
式により得られる順次走査信号を動画時の順次走査信号
として用いることを特徴とする動き適応型の走査変換方
式。3. A scan conversion method for converting an interlaced scan original image signal into a sequential scan, which is obtained by the scan conversion method according to claim 1 or 2 by detecting a motion amount of an image from the original image signal. A motion-adaptive scan conversion method characterized in that the progressive scan signal is used as a progressive scan signal for a moving image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01042892A JP3168660B2 (en) | 1992-01-24 | 1992-01-24 | Scan conversion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01042892A JP3168660B2 (en) | 1992-01-24 | 1992-01-24 | Scan conversion method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05207430A true JPH05207430A (en) | 1993-08-13 |
| JP3168660B2 JP3168660B2 (en) | 2001-05-21 |
Family
ID=11749887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01042892A Expired - Fee Related JP3168660B2 (en) | 1992-01-24 | 1992-01-24 | Scan conversion method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3168660B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010015478A (en) * | 2008-07-07 | 2010-01-21 | Sony Corp | Image processing apparatus and method |
-
1992
- 1992-01-24 JP JP01042892A patent/JP3168660B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010015478A (en) * | 2008-07-07 | 2010-01-21 | Sony Corp | Image processing apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3168660B2 (en) | 2001-05-21 |
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