CN1158531A - Adaptive gamma correction device using integral look-up table - Google Patents
Adaptive gamma correction device using integral look-up table Download PDFInfo
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- CN1158531A CN1158531A CN96119760A CN96119760A CN1158531A CN 1158531 A CN1158531 A CN 1158531A CN 96119760 A CN96119760 A CN 96119760A CN 96119760 A CN96119760 A CN 96119760A CN 1158531 A CN1158531 A CN 1158531A
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- 230000003044 adaptive effect Effects 0.000 title claims description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 12
- 230000010354 integration Effects 0.000 claims description 18
- 238000000605 extraction Methods 0.000 claims description 11
- 239000000284 extract Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 238000012790 confirmation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 12
- 230000001537 neural effect Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 230000001915 proofreading effect Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 235000012364 Peperomia pellucida Nutrition 0.000 description 1
- 240000007711 Peperomia pellucida Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
- H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/40—Image enhancement or restoration using histogram techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/67—Circuits for processing colour signals for matrixing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Picture Signal Circuits (AREA)
- Image Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Disclosed is an self-adaptive gamma correcting device which utilizes a lookup table obtained by brightness signal integral calculus distribution to effectively use the input signal dynamic range, comprising a matrix unit for receiving R, G and B picture signals and outputting brightness signals, a histogram pick-up device for catching histogram of the brightness signal distribution through comparing the brightness signal distribution level and counting distribution numbers of every corresponding level, a histogram integrating device for accumulating and integrating histogram of the distribution brightness signals, an integral calculus lookup table (LUT) for receiving integral curves obtained from the histogram integrating device and correcting input picture signals, and a gamma level confirmation device for proceeding gamma process on picture signals and outputting corrected brightness signals.
Description
The present invention relates to be used to proofread and correct the gamma correcting device of the luminance signal of charge coupled device from video camera (below be referred to as CCD) output, relate in particular to the adaptive gamma correction device that utilizes look-up table (hereinafter referred to as LUT), this look-up table is by the distribution histogram integration from the luminance signal of the CCD of video camera output is obtained, to effectively utilize the dynamic range of signal.
Herein, gamma is represented the slope of the linear segment of photo-translating system or electric light converting system, and the input and output characteristic of video camera is represented on X and Y-axis respectively in this system.In a television set, the brightness that becomes with the video camera output voltage on the cathode ray tube is expressed as gamma with respect to the logarithm ratio of object brightness.
Gamma correcting device is made of nonlinear circuit, and this nonlinear circuit can produce the output signal with respect to the input signal that satisfies exponential curve.
Fig. 1 illustrates the block diagram of a neural gamma correcting device, and it is a kind of conventional gamma correcting device.
It consists of, a matrix unit 10, be used to receive received image signal R, G and B also extract luminance signal, a Characteristic Extraction unit 12, be used for brightness signal extraction feature amount of brightness from matrix unit 10, a gamma level determining unit 14, be used to utilize respectively from the Characteristic Extraction unit 12 obtain corresponding to the low light part, middle light part, determine the gamma level with the feature amount of brightness of high light part, and a gain booster 16, be used to utilize strengthen gain from the luminance signal of matrix unit 10 outputs and the gamma level of exporting from gamma level determining unit 14.
The operation of the neural gamma correcting device of this routine is as follows.
Matrix unit 10 is extracted luminance signal from input signal R, G and B.The luminance signal extracted is through the level detecting of luminance signal, with to corresponding to the low light part that is included in the luminance level in the frame.The number counting of middle light part and high light part.When definite backlight state exists, frame data are carried out the gamma process, compression intensity level when the data occurrence rate in the given frame is low, and expansion intensity level when high of the brightness data occurrence rate in the given frame, thus enlarge the dynamic range of luminance signal.
When taking a target under the backlight state, the high light of target partly has a large amount of incident lights, and therefore white amplitude limit district increases, and low light partly has a spot of incident light, therefore can not expression picture level.That is therefore the difficulty because the medium dark part of difference picture and very dark part become is expressed as each part and has identical darkness.
In this case, even utilize hundred-percent dynamic range, a spot of signal data that distributes on middle intensity level replaces, and most of signal datas distribute on low or high brightness level.
In order to address the above problem, prior art has been utilized neural gamma correcting device.
Fig. 2 is the diagram of the distribution character of luminance signal during the reversible-light shooting.Referring to Fig. 2, luminance signal is divided into three zones, that is, low, in and the high brightness level, and experienced the first step of the adjustment of data.That is, expand with three times maximum at the signal in dense distribution zone, and be compressed at the signal in sparse distribution zone.
Fig. 3 is the characteristic diagram of I/O of proofreading and correct according to picture during the expression backlight state.
Referring to Fig. 3, under the normal light state, I/O performance index curve forms a man-to-man by-pass line, and obtains under the state at a specific picture, and as the backlight state, the I/O characteristic curve forms a straight line α.When execution is used for first timing that level and smooth luminance signal distributes, I/O characteristic curve β appears.
In addition, carry out the second picture timing after proofreading and correct at first picture, the I/O characteristic curve as shown in Figure 4.
This correction is to be carried out by the gain booster shown in Fig. 1 16, and conventional neural gamma correcting device is to carry out this function by the characteristic quantity adjustment gain enhancing degree according to luminance signal.
But, because the conventional neural means for correcting carries out image adjustment of data is to be divided into three parts by the characteristic quantity that distributes according to luminance component view data, low light, middle light, and Gao Guang can not work under the situation that luminance signal distributes shown in Fig. 5 A like that so backlight is proofreaied and correct.This is because luminance signal is distributed in the central region between low-light level and the middle intensity level, or in the central region between middle intensity level and high brightness level, so unclear according to the respective difference between the level of luminance signal distribution.
Be distributed in luminance signal under the situation in the zone shown in Fig. 5 B and have identical situation with three or more intensity levels.
Therefore, according to conventional equipment, in order to address the above problem, the division of three intensity levels should replace with the division of dozens of intensity level, and also needs tens of gains to strengthen.Yet because the restriction of real-time operation and hardware size, it is very difficult doing like this.
In order to eliminate or to reduce the problems referred to above, the purpose of this invention is to provide a kind of adaptive gamma correction device, it utilizes a look-up table suitably to proofread and correct the view data with complicated luminance signal, and this complexity luminance signal forms uneven histogram.
In order to reach this purpose, the adaptive gamma correction device that is provided comprises:
The matrix unit that is used to receive R, G and B picture signal and exports luminance signal;
By relatively obtaining the histogrammic histogram extraction element of distribution luminance signal from the distribution level of the described luminance signal of described matrix unit output and to distribution number counting corresponding to each level;
Described distribution luminance signal histogram is added up and the histogram integrating gear of integration;
Integral look-up table (LUT) is used to receive the integral curve that obtains from described histogram integrating gear and proofreaies and correct received image signal; And
Being used for that the described picture signal that integration LUT proofreaies and correct is carried out gamma handles and exports the gamma level of calibrated luminance signal and determine device.
Above-mentioned purpose of the present invention and advantage are described preferred embodiment in detail by the reference accompanying drawing will become more apparent.In the accompanying drawing:
Fig. 1 is the block diagram of conventional gamma correcting device;
Fig. 2 is the diagram that is illustrated in the distribution character of the luminance signal of taking under the backlight state;
Fig. 3 is illustrated under the backlight state according to the characteristic diagram of the I/O of conventional means for correcting;
Fig. 4 is the characteristic diagram of I/O that expression is proofreaied and correct according to ideal;
Fig. 5 A and 5B illustrate with conventional gamma correcting device can not make the backlight state that picture is proofreaied and correct;
Fig. 6 is the block diagram according to adaptive gamma correction device of the present invention;
Fig. 7 is the detail drawing of histogram extraction unit shown in Figure 6;
Fig. 8 is the detail drawing of histogram integral unit shown in Figure 6;
Fig. 9 is the Luminance Distribution diagram of expression utilization according to the picture signal under the backlight state of the adaptively correcting device of the embodiment of the invention; And
Figure 10 is the diagram of expression according to the I/O characteristic of integration LUT shown in Figure 9.
Referring to Fig. 6, adaptive gamma correction device according to the embodiment of the invention is made of following several parts, a matrix unit 60, be used to receive picture signal R, G, with B and export luminance signal, a histogram extraction unit 62, be used for extracting the distribution histogram of luminance signal according to the luminance signal distribution that obtains from matrix unit 60, a histogram integral unit 64, be used for histogram integration from 62 outputs of histogram extraction unit, an integration LUT66, be used to utilize the dateout of histogram integral unit 64 received image signal to be converted to the most suitable picture of current screen, with a gamma determining unit 68, be used to utilize the output signal of integration LUT66 to determine a gamma value and export an image of proofreading and correct.
Referring to Fig. 7, histogram extraction unit 62 shown in Figure 6 is made of 256 comparators 70 and 256 counters 72 of corresponding respectively to comparator.
Pass through level ratio from the luminance signal of matrix unit 60 outputs comparator 70, the counter 72 that will have the same brightness level then adds 1.That is, with the level of the vision signal in the frame and corresponding reference level value relatively after, extract pixel count corresponding to each level.
Referring to Fig. 8, this figure is the detail drawing of histogram integral unit 64 shown in Figure 6, and the pixel count of exporting in order from the minimum level counter to the maximum level counter adds up an accumulator 80 and integration.At this moment, the value after adding up is stored among the integration LUT66.
Fig. 9 is the diagram of explanation utilization according to the Luminance Distribution of picture signal under the backlight state of the adaptive gamma correction device of the embodiment of the invention, and Figure 10 is the diagram of the I/O characteristic of explanation integration LUT shown in Figure 9.
Now, with reference to the operation of Fig. 6 to 10 description according to the adaptive gamma correction device of the embodiment of the invention.
Under particular state such as backlight, owing to the high light part and the extreme each other mutually contrast of low light part of a frame, and light part in existing hardly, so can represent as shown in Figure 9 from the histogram of histogram extraction unit 62 acquisitions.
Providing the integration LUT66 (shown in Figure 10) that proofreaies and correct the I/O characteristic of input picture to wait with DRAM, SRAM, FRAM, EEPROM constitutes.
With divide luminance level, to corresponding to the luminance signal counting number of each level, and different according to the conventional neural gamma correction method of the gain of the luminance level adjustment under backlight state enhancing degree, gamma correction method according to the embodiment of the invention uses the LUT that distributes and obtain from luminance signal, therefore can obtain more suitable I/O characteristic adaptively.
Referring to I/O characteristic shown in Figure 10, being expanded as the low light signal 60 below of the Y-signal of LUT input, wherein luminance signal sparsely is distributed in the full luminance signal between 0 and 255, so can express details more accurately.
In addition, as shown in Figure 9, because there is not luminance signal in the middle part level between level 60 and level 200, so, export constant although input may change greatly.
Referring to I/O characteristic curve as shown in figure 10, when the luminance signal between incoming level 200 and the level 255, become output by the luminance signal of corresponding amplification there according to the intensity level.
Therefore, the part of luminance signal sparse distribution is expressed in more detail, and the part of luminance signal dense distribution or the basic part that does not have to distribute are represented simply, can more effectively utilize dynamic range like this.
In addition, according to the gamma correcting device use integration method of the embodiment of the invention, the complicated uneven distribution of the luminance signal shown in Fig. 5 A and Fig. 5 B also can be proofreaied and correct effectively like this.
Proofread and correct with gamma curve shown in Figure 4 according to the output of above-mentioned image rectification smooth operation.
As mentioned above, the conventional method that is different from compression or expansion I/O characteristic, because can effectively utilize the integration method of dynamic range according to the adaptively correcting device utilization of the embodiment of the invention, therefore even can not carry out also obtaining suitable input and output characteristic on the combination distribution luminance level that backlight proofreaies and correct because of compression or the non-constant width of spreading range.
And, the luminance signal that conventional gamma correcting device correction of complex distributes is very difficult, because need large-scale hardware and the restriction that is subjected to real-time operation, and can imitate the ground desired I/O characteristic curve of acquisition and not have such needs or restriction according to the adaptive gamma correction device of the embodiment of the invention.
Claims (5)
1, a kind of adaptive gamma correction device, described device comprises:
The matrix unit that is used to receive R, G and B picture signal and exports luminance signal;
By relatively obtaining the histogrammic histogram extraction element of distribution luminance signal from the distribution level of the described luminance signal of described matrix unit output and to distribution number counting corresponding to each level;
Described distribution luminance signal histogram is added up and the histogram integrating gear of integration;
Integral look-up table (LUT) is used to receive the integral curve that obtains from described histogram integrating gear and proofreaies and correct described received image signal; And
Being used for that the described picture signal that integration LUT proofreaies and correct is carried out gamma handles and exports the gamma level of calibrated luminance signal and determine device.
2, adaptive gamma correction device as claimed in claim 1 wherein is used for each frame video luminance signal level of comparison and the described histogram extraction element that extracts corresponding to the pixel count of each level comprises a plurality of comparators and a plurality of corresponding with it counter.
3, adaptive gamma correction device as claimed in claim 2, wherein said histogram integrating gear is realized integration by the output valve of accumulating described counter from the minimum level counter to the maximum level counter successively.
4, adaptive gamma correction device as claimed in claim 1, wherein said integration LUT utilizes RAM to proofread and correct the I/O characteristic.
5, utilize the adaptive gamma correction device of integral look-up table according to claim 1, wherein said integration LUT utilizes EEPROM to proofread and correct the I/O characteristic.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1034/96 | 1996-01-18 | ||
| KR1034/1996 | 1996-01-18 | ||
| KR1019960001034A KR970060961A (en) | 1996-01-18 | 1996-01-18 | Adaptive gamma correction device using integral look-up table |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1158531A true CN1158531A (en) | 1997-09-03 |
| CN1061502C CN1061502C (en) | 2001-01-31 |
Family
ID=19449702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96119760A Expired - Fee Related CN1061502C (en) | 1996-01-18 | 1996-12-11 | Adaptive gamma correction device using integral look-up table |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH09224174A (en) |
| KR (1) | KR970060961A (en) |
| CN (1) | CN1061502C (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007095811A1 (en) * | 2006-02-20 | 2007-08-30 | Huawei Technologies Co., Ltd. | Method for transmitting video gamma characteristic parameter and device thereof |
| WO2007140727A1 (en) * | 2006-06-09 | 2007-12-13 | Huawei Technologies Co., Ltd. | Method and apparatus for correcting gamma characteristic in video communication |
| WO2007147363A1 (en) * | 2006-06-15 | 2007-12-27 | Huawei Technologies Co., Ltd. | A method and an apparatus for correcting the gamma characteristic of the video communication |
| CN100369456C (en) * | 2004-03-23 | 2008-02-13 | 株式会社东芝 | Image forming apparatus and image reading apparatus |
| WO2008025293A1 (en) * | 2006-08-23 | 2008-03-06 | Huawei Technologies Co., Ltd. | A method and apparatus for correcting the gamma characteristic of the video communication |
| CN101340516B (en) * | 2007-07-06 | 2010-06-02 | 鸿富锦精密工业（深圳）有限公司 | Light sensitivity adjusting apparatus and adjusting method |
| CN101409785B (en) * | 2007-10-11 | 2010-06-09 | 鸿富锦精密工业（深圳）有限公司 | Filming apparatus and method |
| US7746364B2 (en) | 2005-06-17 | 2010-06-29 | Getac Technology Corporation | Brightness correction method and system utilizing the same |
| CN101142810B (en) * | 2005-03-15 | 2010-09-01 | 欧姆龙株式会社 | Image processor, image processing method, image processing system |
| CN101132537B (en) * | 2006-08-22 | 2010-09-22 | 华为技术有限公司 | Method and apparatus for obtaining gamma characteristic parameters of gamma segment |
| CN1607873B (en) * | 1999-09-24 | 2012-05-16 | 株式会社半导体能源研究所 | Electroluminescent display unit and electronic device |
| TWI458341B (en) * | 2011-08-10 | 2014-10-21 | Univ Nat Taipei Technology | Method of improving image quality for display device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4835593B2 (en) * | 2005-03-15 | 2011-12-14 | オムロン株式会社 | Image processing apparatus, image processing method, program, and recording medium |
| JP4626497B2 (en) | 2005-11-24 | 2011-02-09 | 株式会社日立製作所 | Video processing device and portable terminal device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07250340A (en) * | 1994-03-11 | 1995-09-26 | Toshiba Corp | Video camera |
| JPH089199A (en) * | 1994-06-20 | 1996-01-12 | Canon Inc | Method and device for processing image pickup signal |
-
1996
- 1996-01-18 KR KR1019960001034A patent/KR970060961A/en not_active Application Discontinuation
- 1996-12-11 CN CN96119760A patent/CN1061502C/en not_active Expired - Fee Related
-
1997
- 1997-01-16 JP JP9005758A patent/JPH09224174A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607873B (en) * | 1999-09-24 | 2012-05-16 | 株式会社半导体能源研究所 | Electroluminescent display unit and electronic device |
| CN100369456C (en) * | 2004-03-23 | 2008-02-13 | 株式会社东芝 | Image forming apparatus and image reading apparatus |
| CN101142810B (en) * | 2005-03-15 | 2010-09-01 | 欧姆龙株式会社 | Image processor, image processing method, image processing system |
| US7746364B2 (en) | 2005-06-17 | 2010-06-29 | Getac Technology Corporation | Brightness correction method and system utilizing the same |
| CN101026773B (en) * | 2006-02-20 | 2010-05-12 | 华为技术有限公司 | Video gamma characteristic parameter transmitting method and device |
| WO2007095811A1 (en) * | 2006-02-20 | 2007-08-30 | Huawei Technologies Co., Ltd. | Method for transmitting video gamma characteristic parameter and device thereof |
| WO2007140727A1 (en) * | 2006-06-09 | 2007-12-13 | Huawei Technologies Co., Ltd. | Method and apparatus for correcting gamma characteristic in video communication |
| WO2007147363A1 (en) * | 2006-06-15 | 2007-12-27 | Huawei Technologies Co., Ltd. | A method and an apparatus for correcting the gamma characteristic of the video communication |
| CN101047869B (en) * | 2006-06-15 | 2011-04-27 | 华为技术有限公司 | Method and device for correction gamma property of video communication |
| CN101132537B (en) * | 2006-08-22 | 2010-09-22 | 华为技术有限公司 | Method and apparatus for obtaining gamma characteristic parameters of gamma segment |
| WO2008025293A1 (en) * | 2006-08-23 | 2008-03-06 | Huawei Technologies Co., Ltd. | A method and apparatus for correcting the gamma characteristic of the video communication |
| CN101340516B (en) * | 2007-07-06 | 2010-06-02 | 鸿富锦精密工业（深圳）有限公司 | Light sensitivity adjusting apparatus and adjusting method |
| US8200036B2 (en) | 2007-07-06 | 2012-06-12 | Hon Hai Precision Industry Co., Ltd. | System and method for adjusting sensitivity of camera module |
| CN101409785B (en) * | 2007-10-11 | 2010-06-09 | 鸿富锦精密工业（深圳）有限公司 | Filming apparatus and method |
| TWI458341B (en) * | 2011-08-10 | 2014-10-21 | Univ Nat Taipei Technology | Method of improving image quality for display device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970060961A (en) | 1997-08-12 |
| JPH09224174A (en) | 1997-08-26 |
| CN1061502C (en) | 2001-01-31 |
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