CN1832584A - Dynamic image contrast regulating device - Google Patents
Dynamic image contrast regulating device Download PDFInfo
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- CN1832584A CN1832584A CN 200510054305 CN200510054305A CN1832584A CN 1832584 A CN1832584 A CN 1832584A CN 200510054305 CN200510054305 CN 200510054305 CN 200510054305 A CN200510054305 A CN 200510054305A CN 1832584 A CN1832584 A CN 1832584A
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Abstract
This invention provides a dynamic image adjusting device for adjusting the comparison degree of the first image signal including multiple pixels and said device includes a first conversion module, an operation module and a second conversion module, in which, the first conversion module receives a first image signal for generating multiple adjusting signals and each pixel is corresponding to one signal, the operation module is connected to the first conversion module and receives a first set of adjust signals in the multiple adjust signals to generate a first gain curve, the second conversion module is connected with the operation module and the first conversion module and generates a second image signal based on the first gain curve and the multiple adjust signals.
Description
Technical field
The present invention is meant the image adjusting device in order to the contrast of dynamic adjustment picture signal especially about a kind of dynamic image adjusting device.
Background technology
Generally speaking, the contrast of natural image refers to bright areas and dark area brightness ratio between the two in the image.Therefore the enhancing of picture contrast perhaps can make image produce the phenomenon of distortion slightly, but for most of people, the impression meeting that suitable contrast strengthens on human vision is comparatively comfortable, and the contrast that therefore how to strengthen image becomes an important problem.
In the existing display technology, can utilize Gamma (gamma) parameter of display to adjust for the enhancing of picture contrast, adjust picture contrast by the relation that changes grey scale signal and brightness, most display is available for users to utilize screen display controlled function (the on screendisplay of display, OSD) adjust contrast voluntarily, or provide the Gamma parameter to select for use improving contrast, but single contrast settings and can't be applicable to all images for the user.For instance, for an image that overall brightness is higher, the setting that the user may select bigger Gamma parameter or change contrast strengthens picture contrast, when but such setting was used for the lower image of brightness, the part that can make the image low-light level was too dark and lose details and make the image quality variation.Therefore, preferable contrast adjustment must be dynamically to go to adjust according to different images, promptly must be different and carry out different adjustment at the brightness of every image.
The notion that contrast strengthens is to make part bright in the image brighter again, gloomy part is more only wished the brightness of image is adjusted, and is not wished to change color, therefore in the color space of brightness and color separated (Y/C), carry out, desirable in more traditional rgb color space.In the existing display technology, also can pass through image encoder (video decoder) or convergent-divergent chip (scaler chip) and change the YPbPr signal or the Y component of YCbCr signal, promptly be to adjust picture contrast by the gain of brightness (Brightness).For image or picture, human eye institute is sensible mainly to be its tone (Hue), brightness (Brightness) and color saturation (Saturation), because rgb signal comprises brightness and color simultaneously, when only wanting that display carried out the processing of color, directly the grey scale signal of adjusting RGB then can't achieve the goal, therefore must be earlier with the brightness in the colour signal with after color is separated, could adjust brightness or color respectively.High-quality picture signal the time also is with brightness and color separated (YPbPr, YCbCr) in transmission, so desire also can be finished by the Y component in the adjustment picture signal when adjusting the contrast of display.In the existing display technology, though the method for adjusting picture contrast is arranged, but all be to utilize YCbCr signal or YPbPr signal to adjust picture contrast, but in the characteristic of YCbCr or YPbPr signal, the effect of brightness and color separated is come poorly than the CIELab signal, and therefore the effect of adjusting also can be utilized the Lab signal to carry out picture contrast relatively and adjust weak effect.
Therefore main purpose of the present invention is to provide a kind of dynamic image adjusting device, to overcome the problems referred to above.
Summary of the invention
The object of the present invention is to provide a kind of dynamic image adjusting device, can dynamically adjust the contrast of picture signal automatically according to different picture signals.
According to dynamic image adjusting device of the present invention, it is in order to the contrast of dynamic adjustment one first picture signal, and wherein this first picture signal comprises a plurality of pixels, and adjusting device comprises one first modular converter, a computing module and one second modular converter.First modular converter receives first picture signal in order to produce a plurality of adjustment signals, and wherein each pixel corresponds respectively to one and adjusts signal.Computing module is connected to first modular converter, and computing module receives one first group of adjustment signal in a plurality of adjustment signals, to produce one first gain curve.Second modular converter is connected to the computing module and first modular converter, and second modular converter foundation first gain curve and a plurality of adjustment signal are to produce one second picture signal.
Dynamic image adjusting device of the present invention, utilize computing module calculate every image picture characteristics, gain module and according to picture characteristics, corresponding adjustment picture signal, can dynamically adjust the contrast degree of picture signal by this method automatically according to different picture signals, make the contrast kilsyth basalt of image frame now reach better effect.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is the system block diagrams of dynamic image adjusting device of the present invention.
Fig. 2 is the schematic diagram of the employed gain curve of adjusting device of the present invention.
Fig. 3 is the flow chart of steps of dynamic image method of adjustment of the present invention.
Fig. 4 selects the flow chart of steps of first gain curve for dynamic image method of adjustment of the present invention.
Fig. 5 produces the flow chart of steps of second picture signal for image adjusting method of the present invention.
The main element symbol description
20: 21: the first picture signals of image adjusting device
24: 25: the first color signals of computing module
27: the second color signals of 26: the second modular converters
28: storage device 30: the brightness calculation module
31: average luminance signal 32: select module
34: 35: the first gain curves of gain curve
40: regular module 41: signal is adjusted in normalization
42: gain module 43: gain signal
44: 45: the second picture signals of reverse conversion module
60,62,64: gain curve
Embodiment
See also Fig. 1, Fig. 1 is the system block diagrams of dynamic image adjusting device 20 of the present invention.The present invention is a kind of dynamic image adjusting device 20, contrast in order to dynamic adjustment one first picture signal 21, wherein first picture signal 21 comprises a plurality of pixels, and adjusting device 20 comprises one first modular converter 22, a computing module 24 and one second modular converter 26.
First modular converter 22 receives first picture signal 21 in order to produce a plurality of adjustment signals, and wherein each pixel corresponds respectively to one and adjusts signal.Each adjustment signal comprises a luminance signal 23, one first color signal 25 and one second color signal 27 in a plurality of adjustment signals.
In an embodiment, computing module 24 comprises a brightness calculation module 30 and and selects module 32.Brightness calculation module 30 is according to first group of luminance signal 23 of adjusting each adjustment signal in the signal, to produce an average luminance signal 31.Selecting module 32 is to be connected to brightness calculation module 30, selects module 32 inner systems to store many gain curves 34 in advance, select module 32 according to average luminance signal 31 to select first gain curve 35 in these many gain curves 34 certainly.
Second modular converter 26 is connected to computing module 24 and first modular converter, 22, the second modular converters 26 foundations, first gain curves 35 and a plurality of adjustment signals to produce one second picture signal 45.
Second modular converter 26 comprises a regular module 40, a gain module 42 and a reverse conversion module 44.Regular module 40 is adjusted signal 41 according to a plurality of adjustment signals to produce a plurality of normalizations.Gain module 42 is connected to regular module 40, and gain module 42 is adjusted signals 41 and first gain curve 35 to produce a plurality of gain signals 43 according to a plurality of normalizations.Reverse conversion module 44 is connected to gain module 42, and a plurality of gain signals 43 of reverse conversion module 44 foundations are to produce second picture signal 45.
In an embodiment, adjusting device 20 also comprises a storage device 28, is connected with computing module 24, in order to storage average luminance signal 31 and first group of luminance signal.
Among another embodiment of dynamic image adjusting device of the present invention in addition, can in storage device, choose average luminance signal, and utilize the calculating of the average luminance signal value of averaging, because the relation of digital circuit arithmetic speed can't be finished all computings before picture shows.Again, the general pattern picture is when playing, image content all is continually varying haply, approximately dial each second and put 60 images, the image frame content change that front and back are several is not too large, so if directly use last the average luminance signal that picture calculated to adjust next picture, the adjustment of carrying out picture contrast is reasonable and feasible, but when picture material changes significantly, can make picture produce the phenomenon of flicker easily.So in present embodiment, the operation that adds a calculating mean value for example, averages the average luminance signal of the image of 31 of fronts, utilize the mean value calculate to adjust the 32nd image again, like this then can avoid image frame to change significantly and the flickering that produces.
See also Fig. 2, Fig. 2 is the schematic diagram of the employed gain curve of adjusting device of the present invention.As shown in Figure 2, trunnion axis represents that the brightness size imported, vertical axis represent the brightness size of exporting after treatment.Curve 60 expression slopes are 1 linear relationship, i.e. brightness need not passed through any processing, or yield value is all 1.62 similar Gamma curves of curve are used for the high image of overall brightness.64 of curves are an inverse curve, make the bright part of image brighter again, and dark part is dark again, and can adjusting up and down, the size of amplitude makes it be suitable for the image of middle or low-light level.The dynamic contrast adjustment of carrying of the present invention's literary composition promptly is the brightness by integral image, choose dynamically as the gain curve of luminance component input among Fig. 2 with output, utilize the pairing gain table of gain curve again, picture contrast is strengthened by the mode of tabling look-up.
See also Fig. 3, Fig. 3 is the flow chart of steps of dynamic image method of adjustment of the present invention.The invention provides a kind of dynamic image method of adjustment, in order to the contrast of dynamic adjustment one first picture signal, wherein first picture signal comprises a plurality of pixels, and method of adjustment comprises the following step:
S70: receive first picture signal in order to produce a plurality of adjustment signals, wherein each pixel corresponds respectively to one and adjusts signal; Each adjustment signal comprises a luminance signal, one first color signal and one second color signal in wherein a plurality of adjustment signals.
S72: receive one first group of adjustment signal in a plurality of adjustment signals, to produce one first gain curve; And
S74: foundation first gain curve and a plurality of adjustment signal are to produce one second picture signal.
See also Fig. 4, Fig. 4 selects the flow chart of steps of first gain curve for dynamic image method of adjustment of the present invention.Wherein this method is stored many gain curves in advance, and as shown in Figure 4, step S72 comprises:
S80: according to first group of luminance signal of adjusting each adjustment signal in the signal, to produce an average luminance signal; And
S82: according to average luminance signal to select the one the first gain curves in this many gain curves certainly.
As shown in Figure 3, wherein this method also comprises:
S76: storage average luminance signal and this first group of luminance signal.
See also Fig. 5, Fig. 5 produces the flow chart of steps of second picture signal for image adjusting method of the present invention.As shown in Figure 5, step S 74 comprises in addition:
S90: adjust signal to produce a plurality of normalizations according to a plurality of adjustment signals;
S92: a plurality of normalization adjustment signals of foundation and first gain curve are to produce a plurality of gain signals; Each gain table in the corresponding a plurality of gain table of each bar gain curve of many gain curves wherein, this step is according to pairing one first gain table of first gain curve and a plurality of normalization adjustment signals, to produce a plurality of gain signals.
S94: a plurality of gain signals of foundation are to produce second picture signal.
The invention provides a kind of dynamic image adjusting device, utilize the brightness calculation device to produce first group of mean flow rate of adjusting signal, select module to select a gain curve according to mean flow rate, then will adjust signal and carry out normalized computing generation normalization adjustment signal, the yield value of normalization being adjusted in the pairing gain table of signal and gain curve carries out the computing adjustment again, can obtain the adjusted gain signal that gains, utilize reverse module converts gain signal again, produce second picture signal and can utilize display to present, finish picture contrast adjustment operation.Therefore dynamic image adjusting device of the present invention can be with the picture material difference, adjust the contrast of every image automatically and dynamically, and color space of the present invention is CIE (Commission Internationale de L '
The CIELab color space that is proposed, or claim the Lab color space.Adopt the reason of Lab to have two, one, the Lab color space is the color space of sensation impartial (perceptional uniform), and another reason is that the Lab color space is brightness and color separated, and separation degree is obvious than other color spaces.Therefore can improve the quality of picture by dynamic image adjusting device of the present invention, and make image that abundanter visual effect be arranged, and allow the picture that display presented show better effect.
By the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category that is arranged in claim of the present invention of various changes and equivalence.
Claims (12)
1. dynamic image adjusting device, in order to the contrast of dynamic adjustment one first picture signal, wherein this first picture signal comprises a plurality of pixels, and this adjusting device comprises:
One first modular converter receives this first picture signal in order to produce a plurality of adjustment signals, and wherein each pixel corresponds respectively to one and adjusts signal;
One computing module is connected to this first modular converter, and this computing module receives one first group of adjustment signal in these a plurality of adjustment signals, to produce one first gain curve; And
One second modular converter, this second modular converter are connected to this computing module and this first modular converter, this second modular converter according to this first gain curve and these a plurality of adjustment signals to produce one second picture signal.
2. adjusting device as claimed in claim 1, wherein each adjustment signal comprises a luminance signal, one first color signal and one second color signal in these a plurality of adjustment signals.
3. adjusting device as claimed in claim 2, this computing module comprises:
One brightness calculation module is according to this first group this luminance signal of adjusting each adjustment signal in the signal, to produce an average luminance signal; And
One selects module, is connected to this brightness calculation module, and this selections module system stores many gain curves in advance, this select module according to this average luminance signal with this first gain curve of selection in this many gain curves certainly.
4. adjusting device as claimed in claim 3, this adjusting device also comprises a storage device, in order to store this average luminance signal and this first group of luminance signal.
5. adjusting device as claimed in claim 1, wherein this second modular converter comprises:
One regular module, this regular module is adjusted signal according to these a plurality of adjustment signals to produce a plurality of normalizations;
One gain module is connected to this regular module, and these a plurality of normalization adjustment signals of this gain module foundation and this first gain curve are to produce a plurality of gain signals; And
One reverse conversion module is connected to this gain module, and these these a plurality of gain signals of reverse conversion module foundation are to produce this second picture signal.
6. the described adjusting device of claim 5, wherein this gain module comprises a plurality of gain table, wherein each gain table is each bar gain curve of corresponding these many gain curves in these a plurality of gain table, this gain module is adjusted signal according to a plurality of normalizations of pairing one first gain table of this first gain curve and this, to produce these a plurality of gain signals.
7. dynamic image method of adjustment, in order to the contrast of dynamic adjustment one first picture signal, wherein this first picture signal comprises a plurality of pixels, and this method of adjustment comprises the following step:
(a) receive this first picture signal in order to produce a plurality of adjustment signals, wherein each pixel corresponds respectively to one and adjusts signal;
(b) receive one first group of adjustment signal in these a plurality of adjustment signals, to produce one first gain curve: and
(c) according to this first gain curve and these a plurality of adjustment signals to produce one second picture signal.
8. method as claimed in claim 7, wherein each adjustment signal comprises a luminance signal, one first color signal and one second color signal in these a plurality of adjustment signals.
9. method as claimed in claim 8, wherein this method system stores many gain curves in advance, and step (b) comprises:
(b1) according to this first group this luminance signal of adjusting each adjustment signal in the signal, to produce an average luminance signal; And
(b2) according to this average luminance signal to select this first gain curve in this many gain curves certainly.
10. method as claimed in claim 9, wherein this method also comprises:
(d) store this average luminance signal and this first group of luminance signal.
11. method as claimed in claim 7, wherein this step (c) comprises in addition:
(c1) adjust signal according to these a plurality of adjustment signals to produce a plurality of normalizations;
(c2) these a plurality of normalization adjustment signals of foundation and this first gain curve are to produce a plurality of gain signals; And
(c3) these a plurality of gain signals of foundation are to produce this second picture signal.
12 methods as claimed in claim 11, wherein each bar gain curve of these many gain curves is each gain table in corresponding a plurality of gain table, step (c2) is to adjust signal according to a plurality of normalizations of pairing one first gain table of this first gain curve and this, to produce these a plurality of gain signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100543051A CN100551082C (en) | 2005-03-08 | 2005-03-08 | Dynamic image contrast adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100543051A CN100551082C (en) | 2005-03-08 | 2005-03-08 | Dynamic image contrast adjusting device |
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| Publication Number | Publication Date |
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| CN1832584A true CN1832584A (en) | 2006-09-13 |
| CN100551082C CN100551082C (en) | 2009-10-14 |
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|---|---|---|---|
| CNB2005100543051A Expired - Fee Related CN100551082C (en) | 2005-03-08 | 2005-03-08 | Dynamic image contrast adjusting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102239513A (en) * | 2008-12-11 | 2011-11-09 | 索尼公司 | Display apparatus, luminance adjusting device, backlight device, luminance adjusting method, and program |
| CN101483738B (en) * | 2008-01-10 | 2011-11-23 | 普诚科技股份有限公司 | Image regulation apparatus |
| CN108629738A (en) * | 2017-03-16 | 2018-10-09 | 阿里巴巴集团控股有限公司 | A kind of image processing method and device |
-
2005
- 2005-03-08 CN CNB2005100543051A patent/CN100551082C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483738B (en) * | 2008-01-10 | 2011-11-23 | 普诚科技股份有限公司 | Image regulation apparatus |
| CN102239513A (en) * | 2008-12-11 | 2011-11-09 | 索尼公司 | Display apparatus, luminance adjusting device, backlight device, luminance adjusting method, and program |
| CN102239513B (en) * | 2008-12-11 | 2014-04-23 | 索尼公司 | Display apparatus, luminance adjusting device, backlight device, luminance adjusting method |
| CN108629738A (en) * | 2017-03-16 | 2018-10-09 | 阿里巴巴集团控股有限公司 | A kind of image processing method and device |
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| Publication number | Publication date |
|---|---|
| CN100551082C (en) | 2009-10-14 |
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Granted publication date: 20091014 Termination date: 20170308 |