WO2009098830A1 - 鮮鋭化画像処理装置、方法、及びソフトウェア - Google Patents
鮮鋭化画像処理装置、方法、及びソフトウェア Download PDFInfo
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- WO2009098830A1 WO2009098830A1 PCT/JP2008/073383 JP2008073383W WO2009098830A1 WO 2009098830 A1 WO2009098830 A1 WO 2009098830A1 JP 2008073383 W JP2008073383 W JP 2008073383W WO 2009098830 A1 WO2009098830 A1 WO 2009098830A1
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- 238000003707 image sharpening Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title description 16
- 238000009499 grossing Methods 0.000 claims abstract description 12
- 235000019557 luminance Nutrition 0.000 claims description 88
- 230000015654 memory Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 6
- 239000003086 colorant Substances 0.000 claims description 5
- 238000003672 processing method Methods 0.000 claims description 4
- 230000000873 masking effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- G06T5/75—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/409—Edge or detail enhancement; Noise or error suppression
- H04N1/4092—Edge or detail enhancement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
Definitions
- the present invention relates to image processing of an image display, printing, expression, photographing, and recording device, for example, a sharpened image processing device, a method, and software.
- UM Unsharp Masking
- AK Jain "Fundamentals of Digital” Image Processing ", see Prentice Hall, Inc., Inglewood Cliffs, NJ, 1989
- Non-Patent Document 1 The unsharp masking method uses a characteristic of the human visual system called the Mach band effect. This characteristic is a visual phenomenon in which the perceived luminance of adjacent regions depends on the sharpness of the transition portion. Due to this property, the sharpness of the image can be improved by introducing more obvious changes between the image areas.
- the basic idea of the unsharp masking method is to subtract a signal obtained by filtering the input signal with a low-pass filter from the input signal.
- Edgebanding artifacts are highly undesirable artifacts in consumer images. In order not to make this feel visually, since it is necessary to disperse it in a sufficiently wide range, a large filter is required, and there is a problem of an increase in cost due to an increase in line memory in the smoothing means. .
- the present invention provides a sharpened image processing apparatus that solves the above problems in view of the above-described conventional problems.
- the present invention also provides a sharpened image processing method and software.
- the sharpened image processing apparatus of the present invention smoothes the luminance of the input image, obtains a smoothed image, subtracting means for subtracting the smoothed image from the luminance of the input image to obtain a difference image, Luminance-linked gain calculation means for calculating a brightness-linked gain from the input image, first multiplication means for multiplying the difference image by the brightness-linked gain and obtaining a multiplication result, and the multiplication result as the brightness of the input image Addition means for obtaining the luminance of the output image, color difference gain calculating means for calculating the color difference gain from the color difference of the input image and the luminance interlock gain, and multiplying the color difference of the input image by the color difference gain, And a second multiplication means for obtaining a color difference of the output image. In this way, the sharpening process can be performed by changing only the luminance without changing the hue.
- the luminance interlock gain calculation means calculates the luminance interlock gain so that a U gain in the luminance of the output image is smaller than an L gain.
- the IIR filter is used for the past line
- the line memory for the past line is set to one
- the current line is cur
- the past line is pre
- the new past line is Newpre
- the current line ratio is N
- the past The percentage of the line is M
- the luminance interlocking gain calculation means may calculate gains for all luminance values of the input image.
- the luminance-linked gain calculation means may calculate the gain by dividing the luminance value of the input image into a plurality of sections and interpolating with setting values for each section.
- the color difference gain calculating means uses Cb and Cr as the color difference of the input image, Y as the luminance, Cb unsharp and Cr unsharp as the color difference of the output image, and Y unsharp as the luminance of the input image in the color space in the luminance / color difference expression.
- (X, y) is the highest saturation point on the straight line passing through the origin corresponding to the same hue and (Cb, Cr), and the highest saturation of the first and second primary colors constituting the input image is (Cb0, Cr0), (Cb1, Cr1), luminances Y0, Y1, and the angle between the origin and the straight line passing through (Cb, Cr) and the axis of Cb is ⁇ ,
- the color difference gain may be calculated so that
- the color difference gain calculating means is configured such that the color difference of the input image is Cb, Cr, the color difference of the output image is Cb unsharp , Cr unsharp , and the luminance from the input image to the output image in the color space in luminance / color difference expression. And Yb diff and Cbgain and Crgain as constants,
- the color difference gain may be calculated so that
- the sharpening image processing apparatus of the present invention can perform the sharpening process by changing only the luminance without changing the hue.
- FIG. 1 is a block diagram showing an example of the configuration of a sharpened image processing apparatus of the present invention.
- the sharpened image processing apparatus 1 smoothes the luminance of the input image and supplies the smoothed image to the subtracting unit 5, calculates the luminance interlock gain from the luminance of the input image, and calculates the color difference gain calculating unit 4.
- FIG. 2 is a diagram showing a processed image waveform in the sharpened image processing apparatus 1 of FIG.
- the flow of basic unsharp mask processing will be described with reference to FIG.
- (1) is a luminance waveform of the input image.
- (2) is a waveform (blurred image waveform) of a smoothed image obtained by smoothing (1).
- (3) is a waveform of the difference image obtained by subtracting (2) from (1).
- (4) is a luminance waveform of the output image obtained by multiplying (3) by the luminance interlock gain and adding (1).
- the gain on the positive side is called the U gain
- the gain on the negative side is called the L gain.
- the U gain When the U gain is set to 0, it is possible to prevent the waveform from changing upward.
- the luminance interlocking gain calculation means divides the luminance value of the input image into a plurality of sections in order to make the U gain zero, and when interpolation is performed with setting values for each section, the basic gain is set to 0 for all sections. The amount of change is also set to zero. Although it is not best to set the U gain to 0, it is generally preferable to make the U gain smaller than the L gain.
- FIG. 3 is a diagram for explaining such a line memory reduction method.
- N is the ratio of the current line
- M is the ratio of the past line.
- the processing on the future line side uses an FIR filter.
- FIG. 4 is a graph for explaining an example of setting of the brightness interlocking gain in the brightness interlocking gain calculating means 3 of FIG.
- the luminance interlocking gain calculation means 3 changes the gain according to the luminance value Y of the input image. For example, conversion may be performed by holding gains for all luminance values, but as shown in FIG. 4, the luminance value is divided into a plurality of sections (16 in FIG. 4), and a set value is set for each section.
- the gain may be calculated by interpolation.
- FIG. 5 is a graph for explaining the calculation of the color difference gain in the color difference gain calculation means 4 of FIG.
- the color difference gain calculating means 4 and the multiplying means 8 perform the calculation as follows.
- the luminance Yr at the point (x, y) is Y0 where the luminance of the primary color blue is Y0 and the luminance of the primary color magenta is Y1.
- Yr Y0 + (Y1-Y0) ⁇ ratio It becomes.
- the luminance at which the saturation on the straight line (same hue) passing through the point (Cb, Cr) and the origin is maximized is Yr.
- the sharpened image processing apparatus of the present invention calculates the color difference gain based on the luminance interlocking gain, and performs the sharpening process by changing only the luminance without changing the hue. Can do.
- the number of line memories can be reduced by using an IIR filter for the past line in the smoothing means.
- the sharpened image processing apparatus of the present invention may be implemented as a circuit or may be implemented by a computer executing software.
- the present invention can be implemented not only as a sharpening image processing apparatus as described above, but also as a sharpening image processing method performed in the sharpening image processing apparatus, or software that causes a computer to execute the sharpening image processing method. is there. Further, such software may be stored in a recording medium or downloaded from a network such as the Internet.
- the present invention is applicable to a sharpened image processing apparatus, method, and software.
Abstract
Description
2、12 平滑化手段
3 輝度連動ゲイン計算手段
4 色差用ゲイン計算手段
5、13 減算手段
6、8、14 乗算手段
7、15 加算手段
11 アンシャープマスキング装置
図1は、本発明の鮮鋭化画像処理装置の構成の一例を示すブロック図である。鮮鋭化画像処理装置1は、入力画像の輝度を平滑化し、減算手段5に平滑化画像を供給する平滑化手段2と、入力画像の輝度から輝度連動ゲインを計算し、色差用ゲイン計算手段4と乗算手段6に供給する輝度連動ゲイン計算手段3と、入力画像の色差と輝度連動ゲインとから色差用ゲインを計算し、乗算手段8に供給する色差用ゲイン計算手段4と、入力画像の輝度から平滑化画像を減算して差分画像を計算し、乗算手段6に供給する減算手段5と、差分画像と輝度連動ゲインとを乗算し、乗算結果を加算手段7に供給する乗算手段6と、乗算結果を入力画像の輝度に加算し、出力画像の輝度を出力する加算手段7と、色差用ゲインと入力画像の色差とを乗算し、出力画像の色差を出力する乗算手段8とを備える。
Yr=Y0+(Y1-Y0)×ratio
となる。△点(Cb,Cr)と原点を通る直線上(同一色相)での彩度が最大になる輝度がYrである。
Claims (9)
- 入力画像の輝度を平滑化し、平滑化画像を得る平滑化手段と、
前記入力画像の輝度から前記平滑化画像を減算し、差分画像を得る減算手段と、
前記入力画像から輝度連動ゲインを計算する輝度連動ゲイン計算手段と、
前記差分画像に前記輝度連動ゲインを乗算し、乗算結果を得る第1の乗算手段と、
前記乗算結果を前記入力画像の輝度に加算し、出力画像の輝度を得る加算手段と、
入力画像の色差と前記輝度連動ゲインから色差用ゲインを計算する色差用ゲイン計算手段と、
前記入力画像の色差に前記色差用ゲインを乗算し、出力画像の色差を得る第2の乗算手段とを備えることを特徴とする鮮鋭化画像処理装置。 - 前記輝度連動ゲイン計算手段は、前記出力画像の輝度におけるUゲインがLゲインより小さくなるように前記輝度連動ゲインを計算することを特徴とする請求項1記載の鮮鋭化画像処理装置。
- 前記輝度連動ゲイン計算手段は、入力画像のすべての輝度値に対するゲインを計算することを特徴とする請求項1乃至3のいずれか1項に記載の鮮鋭化画像処理装置。
- 前記輝度連動ゲイン計算手段は、入力画像の輝度値を複数の区間に分割し、区間ごとに設定値をおいて補間することでゲインを計算することを特徴とする請求項1乃至3のいずれか1項に記載の鮮鋭化画像処理装置。
- 前記色差用ゲイン計算手段は、輝度・色差表現での色空間において、入力画像の色差をCb、Cr、輝度をY、出力画像の色差をCbunsharp、Crunsharp、輝度をYunsharpとし、入力画像と同じ色相にあたる原点と(Cb,Cr)を通る直線上の最も彩度が高い点を(x,y)とし、入力画像を構成する第1及び第2の原色の最高彩度を(Cb0,Cr0)、(Cb1,Cr1)、輝度をY0、Y1とし、原点と(Cb,Cr)を通る直線とCbの軸とが成す角をθすると、
Yr=Y0+(Y1-Y0)×ratio
となり、Y>Yrのとき、
Yunsharp=Y+Ydiff
となり、Yunsharp>Yrのとき、
- 入力画像の輝度を平滑化し、平滑化画像を得る工程と、
前記入力画像の輝度から前記平滑化画像を減算し、差分画像を得る工程と、
前記入力画像から輝度連動ゲインを計算する工程と、
前記差分画像に前記輝度連動ゲインを乗算し、乗算結果を得る工程と、
前記乗算結果を前記入力画像の輝度に加算し、出力画像の輝度を得る工程と、
入力画像の色差と前記輝度連動ゲインから色差用ゲインを計算する工程と、
前記入力画像の色差に前記色差用ゲインを乗算し、出力画像の色差を得る工程とを含むことを特徴とする鮮鋭化画像処理方法。 - 請求項8に記載の鮮鋭化画像処理方法をコンピュータに実行させるソフトウェア。
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US12/865,973 US8351733B2 (en) | 2008-02-04 | 2008-12-24 | Image sharpening processing device, method, and software |
EP08872187.3A EP2242020B1 (en) | 2008-02-04 | 2008-12-24 | Image sharpening processing device, method, and software |
BRPI0822280-0A BRPI0822280A2 (pt) | 2008-02-04 | 2008-12-24 | Dispositivo de processamento, método e software para aumentar a nitidez de imagem |
MX2010008449A MX2010008449A (es) | 2008-02-04 | 2008-12-24 | Dispositivo, metodo y software de procesamiento para definicion de imagenes. |
CN2008801263878A CN101933043B (zh) | 2008-02-04 | 2008-12-24 | 图像锐化处理设备、方法以及软件 |
HK11104480.6A HK1150463A1 (en) | 2008-02-04 | 2011-05-05 | Image sharpening processing device, method, and software |
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CN (1) | CN101933043B (ja) |
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Also Published As
Publication number | Publication date |
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CN101933043A (zh) | 2010-12-29 |
BRPI0822280A2 (pt) | 2015-06-30 |
RU2456670C2 (ru) | 2012-07-20 |
EP2242020A1 (en) | 2010-10-20 |
US20100329581A1 (en) | 2010-12-30 |
JP4314305B1 (ja) | 2009-08-12 |
RU2010136942A (ru) | 2012-03-20 |
EP2242020A4 (en) | 2012-08-08 |
CN101933043B (zh) | 2013-03-20 |
EP2242020B1 (en) | 2013-05-08 |
US8351733B2 (en) | 2013-01-08 |
MX2010008449A (es) | 2010-08-30 |
HK1150463A1 (en) | 2011-12-30 |
JP2009187118A (ja) | 2009-08-20 |
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