JP2000078437A5 - - Google Patents
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- JP2000078437A5 JP2000078437A5 JP1998246640A JP24664098A JP2000078437A5 JP 2000078437 A5 JP2000078437 A5 JP 2000078437A5 JP 1998246640 A JP1998246640 A JP 1998246640A JP 24664098 A JP24664098 A JP 24664098A JP 2000078437 A5 JP2000078437 A5 JP 2000078437A5
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- luminance level
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- 238000007906 compression Methods 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 230000000977 initiatory Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Description
こうして求めたＹのピーク値をピーク検出回路１２で検出して得られたＹｐとあらかじめ設定値１３−２として決められた輝度圧縮後のピーク値Ｙ´ｐと圧縮率（傾き）Ｋｓから、処理回路１３の計算回路１３−１で、式（４）によりＫｐを求めることができる。このＫｐとＫｓからＲＧＢの各入力に演算処理部１５−１〜１５−３にて式（１）および式（２）の処理を加えることにより入力映像信号を圧縮することができる。処理回路１３の演算は主にソフトウェアによる制御である。 Processing is performed from Yp obtained by detecting the peak value of Y obtained in this way by the peak detection circuit 12, the peak value Y'p after luminance compression and the compression rate (slope) Ks, which are predetermined as set values 13-2. In the calculation circuit 13-1 of the circuit 13, Kp can be obtained by the equation (4). The input video signal can be compressed by adding the processing of equations (1) and (2) to each of the inputs from Kp and Ks to RGB by the arithmetic processing units 15-1 to 15-3. The calculation of the processing circuit 13 is mainly controlled by software.
【００２６】
【課題を解決するための手段】
上記課題を達成するため、本発明は、入力映像信号の高輝度部分のダイナミックレンジを適応的に圧縮して出力する映像信号処理装置であって、（１）入力映像信号の輝度レベルのピーク値を検出するピーク値検出手段と、（２）出力輝度レベルの最大値を指定する最大出力輝度レベル設定手段と、（３）ダイナミックレンジの圧縮率を指定する圧縮率設定手段と、（４）入力映像信号の輝度レベルのピーク値、出力輝度レベルの最大値及びダイナミックレンジの圧縮率に基づいて、ダイナミックレンジの圧縮を開始する輝度レベルを算出する圧縮開始輝度レベル算出手段と、（５）圧縮開始輝度レベル以上の高輝度部分について、入力映像信号の輝度分布に対するヒストグラムを検出するヒストグラム検出手段と、（６）ヒストグラム検出手段の検出結果に基づいて、出現頻度の高い輝度レベルに多くの出力ダイナミックレンジを割り当てる変換グラフ生成手段と、（７）生成された変換グラフを用い、入力映像信号の高輝度部分を圧縮する階調変換手段とを有することを特徴とする。
0026
[Means for solving problems]
In order to achieve the above problems, the present invention is a video signal processing device that adaptively compresses and outputs the dynamic range of the high-luminance portion of the input video signal, and (1) the peak value of the brightness level of the input video signal. (2) Maximum output brightness level setting means for specifying the maximum value of the output brightness level, (3) Compression rate setting means for specifying the compression rate of the dynamic range, and (4) Input. A compression start luminance level calculation means for calculating the luminance level at which the dynamic range is started to be compressed based on the peak value of the luminance level of the video signal, the maximum value of the output luminance level, and the compression rate of the dynamic range, and (5) the initiation of compression. For high-brightness portions above the luminance level, there are many output dynamic ranges to the luminance level with high frequency of appearance based on the detection results of the histogram detecting means for detecting the histogram with respect to the luminance distribution of the input video signal and (6) the detection result of the histogram detecting means. It is characterized by having a conversion graph generating means for allocating the above, and (7) a gradation conversion means for compressing a high-luminance portion of the input video signal by using the generated conversion graph.
【００４０】
【発明の効果】
以上説明したように本発明の請求項１の発明は、入力映像信号の高輝度部分のダイナミックレンジを適応的に圧縮して出力する映像信号処理装置であって、入力映像信号の輝度レベルのピーク値を検出するピーク値検出手段と、出力輝度レベルの最大値を指定する最大出力輝度レベル設定手段と、ダイナミックレンジの圧縮率を指定する圧縮率設定手段と、入力映像信号の輝度レベルのピーク値、出力輝度レベルの最大値及びダイナミックレンジの圧縮率に基づいて、ダイナミックレンジの圧縮を開始する輝度レベルを算出する圧縮開始輝度レベル算出手段と、圧縮開始輝度レベル以上の高輝度部分について、入力映像信号の輝度分布に対するヒストグラムを検出するヒストグラム検出手段と、ヒストグラム検出手段の検出結果に基づいて、出現頻度の高い輝度レベルに多くの出力ダイナミックレンジを割り当てる変換グラフ生成手段と、生成された変換グラフを用い、入力映像信号の高輝度部分を圧縮する階調変換手段とを有することを特徴とする。
これにより、比較的簡単な方法で、入力映像信号のピーク値の変動が映像信号に影響することなく、限られた出力ダイナミックレンジを有効を利用することができ、優れた階調表現を示す輝度圧縮用の映像信号処理装置を実現することができ、かつ変換設定の処理を自動的に行うことができる。
0040
【Effect of the invention】
As described above, the invention of claim 1 of the present invention is a video signal processing device that adaptively compresses and outputs the dynamic range of the high-luminance portion of the input video signal, and peaks the brightness level of the input video signal. A peak value detecting means for detecting a value, a maximum output luminance level setting means for specifying the maximum value of the output luminance level, a compression factor setting means for specifying a compression rate of a dynamic range, and a peak value of the luminance level of an input video signal. , Input video for the compression start luminance level calculation means that calculates the luminance level that starts compression of the dynamic range based on the maximum value of the output luminance level and the compression rate of the dynamic range, and the high-luminance portion that is higher than the compression start luminance level. A histogram detecting means for detecting a histogram for the brightness distribution of a signal, a conversion graph generating means for allocating a large output dynamic range to a luminance level with a high frequency of occurrence based on the detection result of the histogram detecting means, and a generated conversion graph. It is characterized by having a gradation conversion means for compressing a high-luminance portion of the input video signal.
As a result, the limited output dynamic range can be effectively used without the fluctuation of the peak value of the input video signal affecting the video signal by a relatively simple method, and the brightness showing excellent gradation expression. A video signal processing device for compression can be realized, and conversion setting processing can be automatically performed.
本発明の請求項２の発明は、前記圧縮開始輝度レベルの最小値を指定する最小圧縮開始輝度レベル設定手段を有し、圧縮開始輝度レベル算出手段で算出された圧縮開始輝度レベルが、最小圧縮開始輝度レベル設定手段で指定される最小値よりも低い場合、圧縮開始輝度レベル算出手段は、圧縮開始輝度レベルを最小値に置換すると共に、置換後の条件を満たすように前記ダイナミックレンジの圧縮率を補正することを特徴とする。
これにより、必要以上に圧縮点が下がって高輝度部分だけを圧縮するという目的から外れ、輝度を全体に下げてしまうような虞を防止することができる。
The invention of claim 2 of the present invention has a minimum compression start luminance level setting means for designating the minimum value of the compression start luminance level, and the compression start luminance level calculated by the compression initiation luminance level calculation means is the minimum compression. If it is lower than the minimum value specified by the start luminance level setting means, the compression start luminance level calculation means replaces the compression start luminance level with the minimum value, and the compression rate of the dynamic range so as to satisfy the condition after the replacement. It is characterized by correcting.
As a result, it is possible to prevent the possibility that the compression point is lowered more than necessary to deviate from the purpose of compressing only the high-luminance portion and the brightness is lowered as a whole.
Claims (2)
前記入力映像信号の輝度レベルのピーク値を検出するピーク値検出手段と、A peak value detecting means for detecting the peak value of the brightness level of the input video signal, and
出力輝度レベルの最大値を指定する最大出力輝度レベル設定手段と、Maximum output brightness level setting means for specifying the maximum value of output brightness level, and
ダイナミックレンジの圧縮率を指定する圧縮率設定手段と、A compression rate setting means that specifies the compression rate of the dynamic range, and
入力映像信号の輝度レベルのピーク値、前記出力輝度レベルの最大値及び前記ダイナミックレンジの圧縮率に基づいて、ダイナミックレンジの圧縮を開始する輝度レベルを算出する圧縮開始輝度レベル算出手段と、A compression start luminance level calculating means for calculating the luminance level at which the dynamic range is started to be compressed based on the peak value of the luminance level of the input video signal, the maximum value of the output luminance level, and the compression rate of the dynamic range.
圧縮開始輝度レベル以上の高輝度部分について、入力映像信号の輝度分布に対するヒストグラムを検出するヒストグラム検出手段と、A histogram detecting means for detecting a histogram with respect to the luminance distribution of the input video signal for a high-luminance portion above the compression start luminance level,
ヒストグラム検出手段の検出結果に基づいて、出現頻度の高い輝度レベルに多くの出力ダイナミックレンジを割り当てる変換グラフ生成手段と、A conversion graph generation means that allocates a large output dynamic range to the luminance level that appears frequently based on the detection result of the histogram detection means,
生成された変換グラフを用い、前記入力映像信号の高輝度部分を圧縮する階調変換手段とA gradation conversion means for compressing a high-luminance portion of the input video signal using the generated conversion graph.
を有することを特徴とする映像信号処理装置。A video signal processing device characterized by having.
前記圧縮開始輝度レベルの最小値を指定する最小圧縮開始輝度レベル設定手段を有し、
前記圧縮開始輝度レベル算出手段で算出された圧縮開始輝度レベルが、前記最小圧縮開始輝度レベル設定手段で指定される最小値よりも低い場合、
前記圧縮開始輝度レベル算出手段は、前記圧縮開始輝度レベルを前記最小値に置換すると共に、置換後の条件を満たすように前記ダイナミックレンジの圧縮率を補正する
ことを特徴とする映像信号処理装置。 The video signal processing device according to claim 1 is
It has a minimum compression start luminance level setting means for designating the minimum value of the compression start luminance level.
When the compression start luminance level calculated by the compression start luminance level calculating means is lower than the minimum value specified by the minimum compression start luminance level setting means.
The compression start luminance level calculating means is configured to replace the compression start luminance level to the minimum value, that to correct the compression ratio of the dynamic range so as to satisfy the condition after replacement
A video signal processing device characterized by this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24664098A JP4207259B2 (en) | 1998-09-01 | 1998-09-01 | Video signal processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24664098A JP4207259B2 (en) | 1998-09-01 | 1998-09-01 | Video signal processing device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2000078437A JP2000078437A (en) | 2000-03-14 |
| JP2000078437A5 true JP2000078437A5 (en) | 2005-10-27 |
| JP4207259B2 JP4207259B2 (en) | 2009-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24664098A Expired - Fee Related JP4207259B2 (en) | 1998-09-01 | 1998-09-01 | Video signal processing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4207259B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100601967B1 (en) | 2004-10-08 | 2006-07-18 | 삼성전자주식회사 | Apparatus and method for compressing dynamic range of image |
| JP5111310B2 (en) * | 2008-09-09 | 2013-01-09 | キヤノン株式会社 | Image processing method and image processing apparatus |
| JP5159647B2 (en) * | 2009-01-07 | 2013-03-06 | キヤノン株式会社 | Image processing apparatus and image processing method |
| JP5005731B2 (en) * | 2009-05-25 | 2012-08-22 | パナソニック株式会社 | Camera apparatus and exposure control method |
-
1998
- 1998-09-01 JP JP24664098A patent/JP4207259B2/en not_active Expired - Fee Related
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