JPH11261849A - Digital signal processing circuit - Google Patents
Digital signal processing circuitInfo
- Publication number
- JPH11261849A JPH11261849A JP10063133A JP6313398A JPH11261849A JP H11261849 A JPH11261849 A JP H11261849A JP 10063133 A JP10063133 A JP 10063133A JP 6313398 A JP6313398 A JP 6313398A JP H11261849 A JPH11261849 A JP H11261849A
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- Prior art keywords
- frequency component
- output
- expansion
- interpolation
- linear
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、映像信号を時間
方向に伸長するデジタル信号処理回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal processing circuit for extending a video signal in the time direction.
【０００２】[0002]
【従来の技術】一般的に、映像信号を時間的に伸長させ
るには、補間フィルタを用いた線形の補間処理を行って
いる。この補間フィルタの原理について図１３を用いて
説明する。例えば、時間的に４／３倍に映像信号を伸長
する場合には、まず図１３（ｂ）のようにサンプリング
周波数ｆｓを見かけ上４倍に上げるために零点を挿入す
る。そして低域フィルタで処理することにより、新たに
点列が加えられ、内挿されたものとなる。この信号スペ
クトルは図１３（ｃ）のようになる。そして４／３ｆｓ
で再標本化すると図１３（ｄ）のようなスペクトルとな
る。2. Description of the Related Art Generally, in order to temporally expand a video signal, a linear interpolation process using an interpolation filter is performed. The principle of this interpolation filter will be described with reference to FIG. For example, when a video signal is temporally expanded by a factor of 4/3, a zero is first inserted to apparently increase the sampling frequency fs by a factor of 4 as shown in FIG. Then, by performing processing with a low-pass filter, a new point sequence is added and interpolated. This signal spectrum is as shown in FIG. And 4 / 3fs
Re-sampling results in a spectrum as shown in FIG.
【０００３】しかし、実際には元のサンプリング周波数
ｆｓで再標本化を行うため、図１３（ｅ）に示すよう
に、元信号に対して信号帯域は３／４倍に下がることに
なる。このため図１５（ａ）のようなステップ波形の信
号を４／３倍に伸長すると、図１５（ｂ）のように信号
帯域が３／４倍となり、エッジ部での鮮鋭感がなくな
る。そこでエッジ部での鮮鋭感を改善するために、元信
号の高域成分を抽出して、伸長した信号に加算する方法
が一般的に行われる。However, since resampling is actually performed at the original sampling frequency fs, as shown in FIG. 13E, the signal band is reduced to 3/4 times the original signal. For this reason, when the signal having the step waveform as shown in FIG. 15A is expanded to 4/3 times, the signal band becomes 3/4 times as shown in FIG. 15B, and the sharpness at the edge portion is lost. Therefore, in order to improve sharpness at an edge portion, a method of extracting a high-frequency component of an original signal and adding the extracted high-frequency component to an expanded signal is generally performed.
【０００４】図１４にブロック図を示す。入力端子１５
１から入力した映像信号は伸長処理部１５２により線形
の補間処理をおこない、伸長する。また映像信号は高域
抽出部１５３により図１５（ｃ）のように高域成分を抽
出する。抽出した高域成分は伸長処理部１５４により線
形の補間処理を行い、図１５（ｄ）のように伸長する。
その後、伸長処理部１５２，１５４のそれぞれの出力を
加算手段１５５で加算することで、出力端子１５６に
は、図１５（ｅ）の実線で示すようにエッジ部の鮮鋭感
を改善することができる。FIG. 14 is a block diagram. Input terminal 15
The video signal input from 1 is subjected to linear interpolation processing by a decompression processing unit 152 and decompressed. The high frequency component is extracted from the video signal by the high frequency extracting unit 153 as shown in FIG. The extracted high frequency component is subjected to linear interpolation processing by the expansion processing unit 154, and is expanded as shown in FIG.
Thereafter, the outputs of the decompression processing units 152 and 154 are added by the adding unit 155, so that the sharpness of the edge portion can be improved at the output terminal 156 as shown by the solid line in FIG. .
【０００５】[0005]
【発明が解決しようとする課題】上記した映像信号を時
間方向に伸長する従来のデジタル信号処理回路では、抽
出された高域成分に線形補間を行って伸長するため、高
域成分自体の帯域が下がり、エッジ部の改善効果が小さ
くなる。In the conventional digital signal processing circuit for extending the video signal in the time direction, since the extracted high-frequency component is extended by performing linear interpolation, the bandwidth of the high-frequency component itself is reduced. And the effect of improving the edge portion is reduced.
【０００６】この発明は、映像信号の高域成分を伸長す
るとき、非線形の特性を持たせた補間を行うことで、高
域成分の帯域を落とさずにエッジ部の改善を行うことを
目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to improve the edge portion without deteriorating the band of a high frequency component by performing interpolation with a non-linear characteristic when expanding a high frequency component of a video signal. I do.
【０００７】[0007]
【課題を解決するための手段】上記した課題を解決する
ために、この発明のデジタル信号処理回路では、入力さ
れた映像信号を伸長する伸長手段と、前記映像信号の高
域成分を抽出する手段と、前記高域成分に非線形特性を
持たせた補間処理を行い、伸長を行う非線形伸長手段
と、前記伸長手段の出力と非線形伸長手段の出力を加算
する加算手段とを具備することを特徴とする。In order to solve the above-mentioned problems, in a digital signal processing circuit according to the present invention, a decompression means for decompressing an input video signal and a means for extracting a high-frequency component of the video signal are provided. And performing an interpolation process in which the high-frequency component has a non-linear characteristic, performing non-linear expansion means for performing expansion, and adding means for adding the output of the expansion means and the output of the non-linear expansion means. I do.
【０００８】また、入力された映像信号の高域成分を抽
出する手段と、前記映像信号の低域成分を抽出する手段
と、前記低域成分を伸長する伸長手段と、前記高域成分
に非線形特性を持たせた補間処理を行い、伸長を行う非
線形伸長手段と、伸長出力と非線形伸長出力を加算する
加算手段とを具備することを特徴とする。A means for extracting a high-frequency component of the input video signal; a means for extracting a low-frequency component of the video signal; an expansion means for expanding the low-frequency component; It is characterized by comprising nonlinear expansion means for performing interpolation processing having characteristics and performing expansion, and adding means for adding the expansion output and the nonlinear expansion output.
【０００９】さらに、入力された映像信号の高域成分を
抽出する手段と、前記映像信号の低域成分を抽出する手
段と、前記低域成分を伸長する第１の伸長手段と、前記
高域成分を伸長する第２の伸長手段と、前記第２の伸長
手段の出力ゲインを制御するゲイン制御手段と、前記高
域成分に非線形特性を持たせた補間処理を行い、伸長を
行う非線形伸長手段と、前記第１の伸長手段の出力と前
記ゲイン制御手段の出力と前記非線形伸長手段の出力と
を加算する加算手段とを具備することを特徴とする。Further, means for extracting a high-frequency component of the input video signal, means for extracting a low-frequency component of the video signal, first expansion means for expanding the low-frequency component, Second decompression means for decompressing a component, gain control means for controlling an output gain of the second decompression means, and non-linear decompression means for performing an interpolation process in which the high-frequency component is given a non-linear characteristic and performing decompression And an adder for adding an output of the first expander, an output of the gain controller, and an output of the nonlinear expander.
【００１０】上記した各手段を用いることにより、高域
成分を伸長するときに非線形の特性を持たせた補間を行
うことで、高域成分の帯域を落とさずにエッジ部の改善
を行うことができる。[0010] By using each of the above-described means, it is possible to improve the edge portion without dropping the band of the high frequency component by performing interpolation with a nonlinear characteristic when expanding the high frequency component. it can.
【００１１】[0011]
【発明の実施の形態】以下、この発明の実施の形態につ
いて、図面を参照しながら詳細に説明する。図１はこの
発明の第１の実施の形態について説明するための回路構
成図である。図１の各部の信号波形を示した図２ととも
に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit configuration diagram for explaining a first embodiment of the present invention. This will be described with reference to FIG. 2 showing signal waveforms at various parts in FIG.
【００１２】すなわち。入力端子１１から入力された映
像信号（ａ）は、伸長処理部１２により線形補間による
伸長を行う。また入力映像信号は高域抽出部１３により
高域成分を抽出する。抽出された高域成分（ｃ）は、非
線形伸長処理部１４により図２（ｄ）の実線のように信
号帯域が下がらないように非線形の補間処理による伸長
を行う。その後、伸長処理部１２の出力と非線形伸長処
理部１４の出力を加算処理部１５で加算し、出力端子１
６より出力する。That is, The video signal (a) input from the input terminal 11 is expanded by the expansion processing unit 12 by linear interpolation. The high frequency component is extracted from the input video signal by the high frequency extracting unit 13. The extracted high-frequency component (c) is expanded by a non-linear interpolation process by the non-linear expansion processing unit 14 so that the signal band does not decrease as indicated by the solid line in FIG. Thereafter, the output of the decompression processing unit 12 and the output of the non-linear decompression processing unit 14 are added by the addition processing unit 15, and the output terminal 1
6 is output.
【００１３】図２（ｅ）は映像信号を線形伸長した信号
ｅ１、高域成分に線形伸長を行い、それを線形伸長した
映像信号に加算した信号ｅ２、高域成分に非線形伸長を
行い、それを線形伸長した映像信号に加算した信号ｅ３
のそれぞれの波形を示している。図２（ｅ）のように高
域成分に非線形伸長を行い、それを線形伸長処理した映
像信号に加算することで、高域成分を線形伸長した場合
より、エッジ部の鮮鋭感を改善することができる。FIG. 2E shows a signal e1 obtained by linearly expanding the video signal, linear expansion of the high frequency component, a signal e2 obtained by adding the signal to the linearly expanded video signal, and nonlinear expansion of the high frequency component. Is added to the video signal linearly expanded
3 shows respective waveforms. As shown in FIG. 2 (e), the sharpening of the edge portion is improved by performing nonlinear expansion on the high frequency component and adding the nonlinear expansion to the video signal subjected to the linear expansion processing, as compared with the case where the high frequency component is linearly expanded. Can be.
【００１４】図３を用い、図１の非線形伸長処理部１４
の第１の具体的な構成例について説明する。この非線形
伸長処理部１４では線形補間による信号帯域の劣化を防
ぐために、非線形の特性を持たせた補間処理を行ってい
る。Referring to FIG. 3, the nonlinear expansion processing unit 14 shown in FIG.
A first specific configuration example will be described. The non-linear expansion processing unit 14 performs an interpolation process having a non-linear characteristic in order to prevent the signal band from deteriorating due to the linear interpolation.
【００１５】すなわち、入力端子３１から入力された映
像信号の高域成分は、最大値／最小値検出部３２、符号
判定部３３にそれぞれ入力する。符号判定部３３では高
域成分の符号が正であるか負であるかを判定する。符号
判定部３３の出力は最大値／最小値検出部３２、補間処
理部３４にそれぞれ入力する。最大値／最小値検出部３
２では、符号判定部３３の判定出力が連続して正の判定
を行っている場合、図４（ｂ）のａ点のように、高域成
分の連続する正の値の中で最大値を検出する。また、判
定出力が連続して負の判定を行っている場合は、図４
（ｂ）ｂ点のように、連続する負の値の中で最小値を検
出する。最大値／最小値検出部３２の出力は、補間処理
部３４に入力する。補間処理部３４では符号判定部３３
の判定出力が連続して正の判定を行っている場合は、最
大値／最小値検出部３２の最大値出力を用いて補間画素
および元の画素全てを置き換える。また、判定出力が連
続して負の判定を行っている場合は、最大値／最小値検
出部３２の最小値出力を用いて補間画素および元の画素
全てを置き換える。That is, the high-frequency component of the video signal input from the input terminal 31 is input to the maximum / minimum value detection section 32 and the code determination section 33, respectively. The sign determination unit 33 determines whether the sign of the high frequency component is positive or negative. The output of the sign determination unit 33 is input to the maximum / minimum value detection unit 32 and the interpolation processing unit 34, respectively. Maximum / minimum value detector 3
In 2, when the determination output of the sign determination unit 33 continuously performs a positive determination, the maximum value among the continuous positive values of the high-frequency component is set to a point a in FIG. To detect. In addition, when the determination output continuously performs a negative determination, FIG.
(B) A minimum value is detected among consecutive negative values as at point b. The output of the maximum / minimum value detection unit 32 is input to the interpolation processing unit 34. In the interpolation processing unit 34, the sign determination unit 33
If the judgment output of (1) is continuously positive, the interpolation pixel and all the original pixels are replaced using the maximum value output of the maximum / minimum value detection unit 32. When the determination output is continuously negative, the interpolation pixel and all the original pixels are replaced by using the minimum value output of the maximum / minimum value detection unit 32.
【００１６】このように、高域成分を線形補間で伸長し
た場合には、図４（ａ）に示すようにエッジ部の信号帯
域が下がるところを、非線形補間を行うことにより図４
（ｂ）に示すように、エッジ部の信号帯域を確保するこ
とができる。この非線形補間出力を出力端子３５から出
力した信号が、図１の非線形伸長処理部１４の出力とな
る。As described above, when the high-frequency component is expanded by linear interpolation, as shown in FIG. 4 (a), a portion where the signal band at the edge portion decreases is subjected to non-linear interpolation to perform the interpolation.
As shown in (b), the signal band at the edge can be secured. A signal that outputs this nonlinear interpolation output from the output terminal 35 is the output of the nonlinear expansion processing unit 14 in FIG.
【００１７】次に図５の回路構成図を用い、非線形伸長
処理部１４の第２の具体的な構成例を示して説明する。
この非線形伸長処理部１４では、図３の構成に高域成分
のレベルによる補間処理の制御を追加している。高域成
分でレベルの小さいものはノイズである可能性があり、
このノイズ成分に非線形伸長処理を行うとノイズ成分を
増幅することになる。そこで、レベルの小さい高域成分
は非線形伸長処理を行わないようにするものである。な
お、図４の構成と同一部分には同一の符号を付して説明
する。Next, a second specific configuration example of the nonlinear expansion processing section 14 will be described with reference to the circuit configuration diagram of FIG.
In the non-linear expansion processing section 14, control of the interpolation processing based on the level of the high frequency component is added to the configuration of FIG. A high-frequency component with a small level may be noise,
When the non-linear extension processing is performed on the noise component, the noise component is amplified. Therefore, high-frequency components having a small level are not subjected to the non-linear expansion processing. Note that the same parts as those in the configuration of FIG.
【００１８】入力端子３１に入力される、図１の高域抽
出部１３からの映像信号の高域成分は、符号判定部３
３、最大値／最小値検出部３２、伸長処理部５１、レベ
ル判定部５２にそれぞれ入力する。レベル判定部５２で
は入力された映像信号の高域成分のレベルをある閾値と
比較する。レベル判定部５２の出力は、選択信号として
選択回路５３に入力する。選択回路５３ではレベル判定
部５２で、高域成分のレベルが閾値よりも小さいと判定
したときは、伸長処理部５１の出力を選択する。高域成
分のレベルが閾値よりも大きいと判定したときは、補間
処理部３４の非線形補間された出力を選択する。選択回
路５３の出力は出力端子３５に出力する。出力端子３５
の出力は、図１の加算処理部１５に出力する。The high frequency component of the video signal input to the input terminal 31 from the high frequency extracting unit 13 in FIG.
3, input to the maximum / minimum value detection unit 32, the decompression processing unit 51, and the level determination unit 52, respectively. The level determination section 52 compares the level of the high frequency component of the input video signal with a certain threshold. The output of the level determination unit 52 is input to the selection circuit 53 as a selection signal. In the selection circuit 53, when the level determination unit 52 determines that the level of the high frequency component is smaller than the threshold, the output of the decompression processing unit 51 is selected. When it is determined that the level of the high-frequency component is larger than the threshold value, the output of the interpolation processing unit 34 subjected to nonlinear interpolation is selected. The output of the selection circuit 53 is output to the output terminal 35. Output terminal 35
Is output to the addition processing unit 15 in FIG.
【００１９】非線形伸長処理された出力端子３５より出
力される信号は、図６に示すようになる。つまり、高域
成分のレベルの小さいところでは線形伸長処理出力を出
力し、レベルの大きいところでは非線形伸長処理出力を
出力する。このように高域成分のレベルにより補間処理
の制御を行うことでノイズ等による妨害を防ぐことがで
きる。The signal output from the output terminal 35 subjected to the non-linear expansion processing is as shown in FIG. In other words, a linear expansion processing output is output where the level of the high frequency component is low, and a nonlinear expansion processing output is output where the level of the high frequency component is high. As described above, by controlling the interpolation processing based on the level of the high frequency component, it is possible to prevent interference due to noise or the like.
【００２０】さらに、図７に非線形伸長処理部４０４の
第３の具体的な構成例を示し説明する。これは高域成分
の符号判定により補間処理の制御を行うものである。こ
の非線形伸長処理部は、図５のレベル判定部５２を削除
し、これに変えて符号判定部３３の出力を基に高域成分
の符号の切り替わりを検出する符号切り替わり検出部７
１に入力する。この符号切り替わり検出部７１の検出結
果に基づいて選択回路５３を切り換えるようにした。FIG. 7 shows a third specific configuration example of the nonlinear expansion processing section 404, which will be described. This controls the interpolation processing by determining the sign of the high frequency component. This non-linear expansion processing section deletes the level judgment section 52 of FIG. 5 and replaces it with the code change detection section 7 which detects the change of the code of the high frequency component based on the output of the sign judgment section 33.
Enter 1 The selection circuit 53 is switched based on the detection result of the code change detection unit 71.
【００２１】高域成分においてレベルの小さい部分は、
図８に示すように、前後の画素で符号が異なる場合が多
い。従って、高域成分の符号の切り替わりを検出し、前
後の画素で符号が異なっている部分を検出した場合は、
非線形伸長処理を行わないようにする。この場合でも、
高域成分の符号の切り替わりにより補間処理の制御を行
うことでノイズ等による妨害を防ぐことができる。The part of the high-frequency component having a small level is
As shown in FIG. 8, the sign is often different between the front and rear pixels. Therefore, when the change of the sign of the high-frequency component is detected and the part where the sign is different between the preceding and succeeding pixels is detected,
Do not perform nonlinear expansion processing. Even in this case,
By controlling the interpolation processing by switching the code of the high-frequency component, it is possible to prevent interference due to noise or the like.
【００２２】ところで、図１の実施の形態のように、高
域成分を非線形伸長した信号をそのまま映像信号を線形
伸長した信号に加算すると、高域成分のレベルが大きく
なり高域がぎらつくように感じる場合がある。By the way, as in the embodiment shown in FIG. 1, when a signal obtained by nonlinearly expanding a high frequency component is added to a signal obtained by linearly expanding a video signal as it is, the level of the high frequency component becomes large and the high frequency becomes glaring. You may feel it.
【００２３】この映像信号のぎらつき感を抑えた、この
発明の第２の実施の形態について図９を用いて説明す
る。この実施の形態は、高域成分の非線形伸長信号を、
映像信号を線形伸長した信号に加算せずに、映像信号を
高域と低域成分に分け、低域成分は線形伸長を行い、高
域成分は非線形伸長を行って、それぞれを加算すること
で、高域成分のレベルの大きくなり過ぎを防ぐものであ
る。図１と同一の構成部分には同一の符号を付して説明
する。A second embodiment of the present invention which suppresses the glare of the video signal will be described with reference to FIG. In this embodiment, the nonlinear expansion signal of the high frequency component is
Instead of adding the video signal to the linearly extended signal, the video signal is divided into high and low frequency components, the low frequency component is linearly extended, and the high frequency component is nonlinearly extended, and each is added. , To prevent the level of the high frequency component from becoming too large. The same components as those in FIG. 1 are described with the same reference numerals.
【００２４】図９において、入力端子１１から入力され
た映像信号は、高域抽出部１３と減算処理部９１に入力
する。高域抽出部１３の出力は、減算処理部９１と非線
形伸長処理部１４にそれぞれ入力する。減算処理部９１
では入力信号から高域成分を減算することで映像信号の
低域成分を抽出する。抽出された低域成分は、伸長処理
部１４で線形の補間処理による伸長を行う。非線形伸長
処理部１４では映像信号の高域成分に非線形の補間処理
による伸長を行う。加算処理部１５では伸長処理部１２
からの低域成分の線形伸長出力と非線形伸長処理部１４
からの高域成分の非線形伸長処理出力を加算する。In FIG. 9, a video signal input from an input terminal 11 is input to a high-frequency extraction unit 13 and a subtraction processing unit 91. The output of the high-frequency extraction unit 13 is input to a subtraction processing unit 91 and a non-linear expansion processing unit 14, respectively. Subtraction processing unit 91
Then, the low-frequency component of the video signal is extracted by subtracting the high-frequency component from the input signal. The extracted low-frequency component is expanded by a linear interpolation process in an expansion processing unit 14. The non-linear expansion processing unit 14 performs expansion of the high frequency component of the video signal by non-linear interpolation processing. In the addition processing unit 15, the decompression processing unit 12
Output of the low-frequency component from the signal and the non-linear expansion processing unit 14
Of the non-linear decompression processing of the high-frequency component from the input.
【００２５】図１０は、この実施の形態と図１の実施の
形態の、出力端子１６より出力される出力信号を示し、
ａはこの実施の形態の出力波形を、ｂは図１の実施の形
態の波形を表している。この実施の形態では、図１の実
施の形態に比べて、高域成分のレベルは抑えながら、エ
ッジ部の改善を行うことができる。FIG. 10 shows output signals output from the output terminal 16 of this embodiment and the embodiment of FIG.
a shows the output waveform of this embodiment, and b shows the waveform of the embodiment of FIG. In this embodiment, the edge portion can be improved while suppressing the level of the high frequency component, as compared with the embodiment of FIG.
【００２６】この実施の形態では、もとの映像信号の線
形伸長出力に高域成分の非線形伸長出力を加算するので
はなく、高域成分の非線形伸長出力をそのまま映像信号
の高域成分とすることで、高域成分のレベルが大きくな
りすぎることを防ぎ、映像のぎらつき感を抑えることが
できる。In this embodiment, instead of adding the nonlinear expansion output of the high frequency component to the linear expansion output of the original video signal, the nonlinear expansion output of the high frequency component is directly used as the high frequency component of the video signal. Thus, it is possible to prevent the level of the high frequency component from becoming too large, and to suppress the glare of the image.
【００２７】図１１は、この発明の第３の実施の形態に
ついて説明するための回路構成図である。この実施の形
態も信号のぎらつき感を抑えたもので、映像信号の線形
伸長出力に高域成分の非線形伸長出力を加算するところ
は、図９の実施の形態と同様で、映像信号の線形伸長を
低域成分と高域成分に分けて行い、高域成分の線形伸長
出力のゲインを制御することで高域成分のレベルが大き
くなりすぎるのを防ぐものである。この実施の形態にお
いて、図９と同一の構成部分には同一の符号を付して説
明する。FIG. 11 is a circuit diagram for explaining a third embodiment of the present invention. This embodiment also suppresses the glare of the signal, and adds the nonlinear expansion output of the high frequency component to the linear expansion output of the video signal in the same manner as the embodiment of FIG. The extension is performed separately for the low-frequency component and the high-frequency component, and the gain of the linear extension output of the high-frequency component is controlled to prevent the level of the high-frequency component from becoming too large. In this embodiment, the same components as those in FIG. 9 are denoted by the same reference numerals and described.
【００２８】この実施の形態は、高域抽出部１３の出力
に、伸長処理部１１１、ゲイン調整部１１２を介して加
算処理部１５に入力した構成部分が図９と異なる。伸長
処理部１１１では、高域抽出部１３より出力される映像
信号の高域成分に線形の補間処理による伸長を行い、そ
の後ゲイン調整部１１２でゲイン調整を行い、加算処理
部１５に入力する。加算処理部１５では、伸長処理部１
２、非線形伸長処理部１４、ゲイン調整部１１２のそれ
ぞれの出力の加算を行う。This embodiment is different from FIG. 9 in that components output from the high-frequency extraction unit 13 to the addition processing unit 15 via a decompression processing unit 111 and a gain adjustment unit 112 are input. The decompression processing unit 111 decompresses the high-frequency component of the video signal output from the high-frequency extraction unit 13 by linear interpolation processing, and thereafter performs gain adjustment in the gain adjustment unit 112 and inputs the result to the addition processing unit 15. In the addition processing unit 15, the decompression processing unit 1
2. The outputs of the non-linear expansion processing unit 14 and the gain adjustment unit 112 are added.
【００２９】図１２のａはこの実施の形態での出力波形
を、ｂは図１の実施の形態での出力波形をそれぞれ表し
ている。この実施の形態の方が高域成分のレベルは抑え
ながら、エッジ部の改善を行っていることが分かる。ゲ
イン調整部１１２は、視聴者の映像のぎらつき感により
外部からの操作により、調整可能である。FIG. 12A shows the output waveform in this embodiment, and FIG. 12B shows the output waveform in the embodiment of FIG. It can be seen that the embodiment improves the edge portion while suppressing the level of the high frequency component. The gain adjustment unit 112 can be adjusted by an external operation according to the viewer's sense of glare in the video.
【００３０】この実施の形態では、映像信号の線形伸長
を低域成分と高域成分に分けて行い、高域成分の線形伸
長出力のゲインを制御することで、高域成分のレベルが
大きくなりすぎるのを防ぎ、映像のぎらつき感を抑える
ことができる。In this embodiment, the level of the high frequency component is increased by performing linear expansion of the video signal separately for the low frequency component and the high frequency component and controlling the gain of the linear expansion output of the high frequency component. It is possible to prevent the image from being too long and to suppress the glare of the image.
【００３１】[0031]
【発明の効果】以上述べたように、この発明では映像信
号から抽出した高域成分に非線形の補間処理による伸長
を行い、これを映像信号に線形の補間処理による伸長を
行った信号に加算することで、映像信号を伸長した際の
エッジ部の帯域を確保し、鮮鋭感を改善できる。As described above, in the present invention, the high-frequency component extracted from the video signal is expanded by nonlinear interpolation processing, and this is added to the signal obtained by expanding the video signal by linear interpolation processing. Thus, the band of the edge portion when the video signal is expanded can be secured, and the sharpness can be improved.
【図１】この発明の第１の実施の形態について説明する
ための回路構成図。FIG. 1 is a circuit configuration diagram for explaining a first embodiment of the present invention.
【図２】図１の動作について説明するための説明図。FIG. 2 is an explanatory diagram for explaining the operation of FIG. 1;
【図３】図１の非線形伸長処理部の第１の実施例につい
て説明するための回路構成図。FIG. 3 is a circuit configuration diagram for explaining a first embodiment of the non-linear expansion processing section in FIG. 1;
【図４】図３の動作について説明するための信号波形
図。FIG. 4 is a signal waveform diagram for explaining the operation of FIG. 3;
【図５】図１の非線形伸長処理部の第２の実施例につい
て説明するための回路構成図。FIG. 5 is a circuit configuration diagram for explaining a second embodiment of the non-linear expansion processing section in FIG. 1;
【図６】図５の動作について説明するための信号波形
図。FIG. 6 is a signal waveform diagram for describing the operation of FIG. 5;
【図７】図１の非線形伸長処理部の第３の実施例につい
て説明するための回路構成図。FIG. 7 is a circuit configuration diagram for explaining a third embodiment of the non-linear expansion processing section in FIG. 1;
【図８】図７の動作について説明するための信号波形
図。FIG. 8 is a signal waveform diagram for explaining the operation of FIG. 7;
【図９】この発明の第２の実施の形態について説明する
ための回路構成図。FIG. 9 is a circuit configuration diagram for explaining a second embodiment of the present invention.
【図１０】図９の効果について説明するための説明図。FIG. 10 is an explanatory diagram for describing the effect of FIG. 9;
【図１１】この発明の第３の実施の形態について説明す
るための回路構成図。FIG. 11 is a circuit configuration diagram for explaining a third embodiment of the present invention.
【図１２】図１１の効果について説明するための説明
図。FIG. 12 is an explanatory diagram for describing an effect of FIG. 11;
【図１３】従来の映像信号の伸長について説明するため
の説明図。FIG. 13 is an explanatory diagram for explaining conventional video signal expansion.
【図１４】従来の映像信号の伸長を行う信号処理回路に
ついて説明するための回路構成図。FIG. 14 is a circuit configuration diagram for explaining a conventional signal processing circuit for expanding a video signal.
【図１５】図１４の動作について説明するための信号波
形図。FIG. 15 is a signal waveform diagram for describing the operation of FIG.
１１…入力端子、１２…伸長処理部、１３…高域抽出
部、１４…非線形伸張処理部、１５…加算処理部、１６
…出力端子、９１…減算処理部、１１１…伸長処理部、
１１２…ゲイン調整部。11 input terminal, 12 decompression processing unit, 13 high-frequency extraction unit, 14 non-linear decompression processing unit, 15 addition processing unit, 16
... output terminal, 91 ... subtraction processing section, 111 ... decompression processing section,
112: gain adjustment unit.
Claims (8)
と、 前記映像信号の高域成分を抽出する手段と、 前記高域成分に非線形特性を持たせた補間処理を行い、
伸長を行う非線形伸長手段と、 前記伸長手段の出力と非線形伸長手段の出力を加算する
加算手段とを具備することを特徴とするデジタル信号処
理回路。An expansion unit for expanding an input video signal, a unit for extracting a high-frequency component of the video signal, and an interpolation process in which the high-frequency component has a non-linear characteristic,
A digital signal processing circuit comprising: a non-linear expansion means for performing expansion; and an adding means for adding an output of the expansion means and an output of the non-linear expansion means.
る手段と、 前記映像信号の低域成分を抽出する手段と、 前記低域成分を伸長する伸長手段と、 前記高域成分に非線形特性を持たせた補間処理を行い、
伸長を行う非線形伸長手段と、 前記伸長手段の出力と非線形伸長手段の出力を加算する
加算手段とを具備することを特徴とするデジタル信号処
理回路。2. A means for extracting a high-frequency component of an input video signal; a means for extracting a low-frequency component of the video signal; an expansion means for expanding the low-frequency component; Performs interpolation processing with characteristics,
A digital signal processing circuit comprising: a non-linear expansion means for performing expansion; and an adding means for adding an output of the expansion means and an output of the non-linear expansion means.
る手段と、 前記映像信号の低域成分を抽出する手段と、 前記低域成分を伸長する第１の伸長手段と、 前記高域成分を伸長する第２の伸長手段と、 前記第２の伸長手段の出力ゲインを制御するゲイン制御
手段と、 前記高域成分に非線形特性を持たせた補間処理を行い、
伸長を行う非線形伸長手段と、 前記第１の伸長手段の出力と前記ゲイン制御手段の出力
と前記非線形伸長手段の出力とを加算する加算手段とを
具備することを特徴とするデジタル信号処理回路。3. A means for extracting a high-frequency component of the input video signal; a means for extracting a low-frequency component of the video signal; a first expanding means for expanding the low-frequency component; A second decompression means for decompressing the component, a gain control means for controlling an output gain of the second decompression means, and an interpolation process in which the high-frequency component has a non-linear characteristic,
A digital signal processing circuit comprising: non-linear expansion means for performing expansion; and addition means for adding the output of the first expansion means, the output of the gain control means, and the output of the non-linear expansion means.
複数の信号を用いて補間を行うことを特徴とする請求項
１〜３のいずれかに記載のデジタル信号処理回路。4. The digital signal processing circuit according to claim 1, wherein said nonlinear expansion processing means performs interpolation using a plurality of signals near the interpolation pixel.
定を行い、補間画素が正の場合は近傍の正の値の信号を
用いて補間を行い、補間画素が負の場合は近傍の負の値
の信号を用いて補間を行うことを特徴とする請求項１〜
３のいずれかに記載のデジタル信号処理回路。5. The non-linear expansion means judges the sign of an interpolation pixel, performs interpolation using a nearby positive value signal when the interpolation pixel is positive, and performs negative interpolation when the interpolation pixel is negative. The interpolation is performed using a signal having a value of
3. The digital signal processing circuit according to any one of 3.
場合は近傍の正の値の信号の最大値、負の場合は負の値
の最小値により補間を行うことを特徴とする請求項１〜
３のいずれかに記載のデジタル信号処理回路。6. The non-linear expansion means performs interpolation using a maximum value of a nearby positive value signal when the interpolation pixel has a positive value and a minimum value of a negative value signal when the interpolation pixel has a negative value. Item 1
3. The digital signal processing circuit according to any one of 3.
ルが小さい場合は非線形処理を行わないことを特徴とす
る請求項１〜３のいずれかに記載のデジタル信号処理回
路。7. The digital signal processing circuit according to claim 1, wherein the nonlinear expansion processing means does not perform the nonlinear processing when the level of the high frequency component is small.
高域成分の符号が異なる場合は非線形処理を行わないこ
とを特徴とする請求項１〜３のいずれかに記載のデジタ
ル信号処理回路。8. The digital signal processing circuit according to claim 1, wherein the non-linear expansion processing means does not perform the non-linear processing when the signs of the high-frequency components of adjacent pixels are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10063133A JPH11261849A (en) | 1998-03-13 | 1998-03-13 | Digital signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10063133A JPH11261849A (en) | 1998-03-13 | 1998-03-13 | Digital signal processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11261849A true JPH11261849A (en) | 1999-09-24 |
Family
ID=13220477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10063133A Withdrawn JPH11261849A (en) | 1998-03-13 | 1998-03-13 | Digital signal processing circuit |
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| Country | Link |
|---|---|
| JP (1) | JPH11261849A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100355234B1 (en) * | 2000-07-04 | 2002-10-11 | 삼성전자 주식회사 | Hybrid interpolator of 2 dimensions for edge enhancement and method thereof |
| US6771835B2 (en) | 2000-06-12 | 2004-08-03 | Samsung Electronics Co., Ltd. | Two-dimensional non-linear interpolation system based on edge information and two-dimensional mixing interpolation system using the same |
| KR100667776B1 (en) * | 2004-05-06 | 2007-01-11 | 삼성전자주식회사 | Method and apparatus for video image interpolation with edge sharpening |
| KR20110089666A (en) * | 2010-02-01 | 2011-08-09 | 삼성전자주식회사 | Method and apparatus for image scaling with image enhancement |
| US11010869B2 (en) * | 2018-11-02 | 2021-05-18 | Realtek Semiconductor Corp. | Image processing circuit and associated image processing method |
-
1998
- 1998-03-13 JP JP10063133A patent/JPH11261849A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6771835B2 (en) | 2000-06-12 | 2004-08-03 | Samsung Electronics Co., Ltd. | Two-dimensional non-linear interpolation system based on edge information and two-dimensional mixing interpolation system using the same |
| KR100355234B1 (en) * | 2000-07-04 | 2002-10-11 | 삼성전자 주식회사 | Hybrid interpolator of 2 dimensions for edge enhancement and method thereof |
| KR100667776B1 (en) * | 2004-05-06 | 2007-01-11 | 삼성전자주식회사 | Method and apparatus for video image interpolation with edge sharpening |
| KR20110089666A (en) * | 2010-02-01 | 2011-08-09 | 삼성전자주식회사 | Method and apparatus for image scaling with image enhancement |
| US11010869B2 (en) * | 2018-11-02 | 2021-05-18 | Realtek Semiconductor Corp. | Image processing circuit and associated image processing method |
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