CN103594061A - Adjustment method and device for backlight luminance - Google Patents
Adjustment method and device for backlight luminance Download PDFInfo
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- CN103594061A CN103594061A CN201210293172.3A CN201210293172A CN103594061A CN 103594061 A CN103594061 A CN 103594061A CN 201210293172 A CN201210293172 A CN 201210293172A CN 103594061 A CN103594061 A CN 103594061A
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Abstract
Disclosed is a backlight adjustment method which includes: detecting a plurality of bright-area objects which have luminance values larger than a preset luminance value and areas larger than a preset area, from an image; calculating area weighted average luminance of all the bright-area objects; and adjusting the backlight luminance of the image at least according to the area weighted average luminance.
Description
Technical field
The present invention relates to backlight illumination adjustment technology.
Background technology
In order to save the power consumption of display panel and to take into account picture contrast, general normal employing dynamic backlight control technology (Content Adaptive Brightness Control, CABC) is adjusted picture brightness.The Main of this technology is to calculate adjustment parameter according to the image content showing, and described backlight module can be adjusted the number percent of backlight open according to described adjustment parameter, as shown in Figure 1.
Generally speaking, dynamic backlight control technology can be added up picture brightness, and decides aforementioned adjustment parameter with " average brightness " or " brightness maximal value ".Fig. 2 is the statistical graph of picture brightness in an example, adjusts the situation of backlight illumination in order to explanation according to picture " average brightness ".In this example, the brightness of picture pixel is between 1 ~ 25.Yet the pixel that is positioned at dark space (brightness is below 12) due to picture itself is more, so the average brightness 11 of picture integral body is lower than median 13.If as adjusting foundation backlight, total painting face is easily adjusted too secretly with this average brightness, make the highlights of picture divide 202 to seem that contrast is not enough.Fig. 3 is the statistical graph of picture brightness in another example, adjusts the situation of backlight illumination in order to explanation according to picture " brightness maximal value ".In this example, the brightness of picture pixel is also between 1 ~ 25.Although it is very few to be positioned at the pixel in clear zone in picture, because picture exists brightness maximal value, be 25 pixel, therefore, backlight illumination is adjusted get Tai Gao easily, has lost the original idea of saving the energy backlight.
Summary of the invention
The invention provides a kind of backlight brightness regulation method.Described method comprises: from image, detect brightness value and over default brightness and area, surpass a plurality of clear zones object of preset area; The area of described a plurality of clear zones object of take is weight, calculates the Area-weighted mean flow rate (area-weighted average brightness) of all clear zones object; And the backlight illumination of at least adjusting described image according to described Area-weighted mean flow rate.
The present invention also provides a kind of backlight illumination adjusting gear.Described device comprises: detecting unit, surpasses a plurality of clear zones object of preset area in order to detect brightness value from image over default brightness and area; Computing unit, is weight in order to take the area of described a plurality of clear zones object, calculates the Area-weighted mean flow rate of all clear zones object; And adjustment unit, in order at least to adjust according to described Area-weighted mean flow rate the backlight illumination that backlight shows described image.
Accompanying drawing explanation
Fig. 1 is the graph of a relation of adjusting parameter and backlight open number percent.
Fig. 2 is the statistical graph of picture brightness in an example, adjusts the situation of backlight illumination in order to explanation according to picture " average brightness ".
Fig. 3 is the statistical graph of picture brightness in an example, adjusts the situation of backlight illumination in order to explanation according to picture " brightness maximal value ".
Fig. 4 is the backlight brightness regulation method process flow diagram according to the embodiment of the present invention.
Fig. 5 A and Fig. 6 are the clear zone object schematic diagram in step S402 of the present invention.
Fig. 5 B is the picture of Fig. 5 A clear zone object schematic diagram under another embodiment.
Fig. 7 is the backlight illumination adjusting gear schematic diagram of the embodiment of the present invention.
[main element symbol description]
The highlights of 202 ~ picture divides;
400 ~ backlight brightness regulation method;
S402 ~ S406 ~ step;
700 ~ backlight illumination adjusting gear;
710 ~ detecting unit;
720 ~ computing unit;
730 ~ adjustment unit;
750 ~ backlight.
Embodiment
Below for introducing the preferred embodiments of the present invention.Each embodiment is in order to principle of the present invention to be described, but non-in order to limit the present invention.Scope of the present invention is when being as the criterion with accompanying claim.
In order to make up the deficiency of known dynamic backlight control technology, the present invention also provides a kind of and take picture object " area " as basic backlight brightness regulation method and device.Below the various embodiment of accompanying drawing explanation backlight brightness regulation method of the present invention will be coordinated.Backlight brightness regulation method
Fig. 4 is the backlight brightness regulation method process flow diagram according to the embodiment of the present invention.Backlight brightness regulation method 400 of the present invention comprises: in step S402, detect brightness value and over default brightness and area, surpass a plurality of clear zones object of preset area from image; In step S404, the area of described a plurality of clear zones object of take is weight, calculates the Area-weighted mean flow rate of all clear zones object; And in step S406, at least according to described Area-weighted mean flow rate, adjust the backlight illumination of described image.
Fig. 5 A is object schematic diagram in clear zone in step S402 of the present invention.For example, backlight brightness regulation method of the present invention can first define default brightness, and the brightness value 13 of Fig. 1 of for example take is default brightness; Define in addition preset area, for example 1% of the image total area.Step 402 of the present invention can detect brightness value and over aforementioned default brightness and area, surpass the clear zone object of aforementioned preset area, for example the clear zone object 502 in Fig. 1 in image 500.It should be noted that default brightness in this embodiment and preset area only for convenience of description, the present invention needn't be limited with this numerical value.
Fig. 5 B is the picture of Fig. 5 A clear zone object schematic diagram under another embodiment.In certain embodiments, in order to make the picture of brightness complexity, be convenient to calculate, can be as shown in Figure 5 B, first whole picture is subdivided into a plurality of blocks (wherein each block has the pixel of similar number), the number of pixels that again brightness in described block is surpassed to aforementioned " default brightness " is considered as " the clear zone area " of described block, and when described " clear zone area " is greater than aforementioned " preset area ", begin described whole block to be considered as clear zone object.Therefore, will there is two clear zone objects 522 and 524(but must note in the picture of Fig. 5 A in the embodiment of Fig. 5 B, and both areas are not identical).When picture brightness changes complicated, object shape when trifling, can adopt this mode reasonably to define " clear zone object ".
In certain embodiments, step S402 of the present invention will detect a plurality of clear zones object respectively with different brightness and different area, for example the clear zone object 602 in Fig. 6 image 600 and clear zone object 604.Wherein, the brightness value of clear zone object 602 is B1, and area is A1; And the brightness value of clear zone object 604 is B2, area is A2.Afterwards, the present invention will carry out step S404: the area of described a plurality of clear zones object of take is weight, calculates the Area-weighted mean flow rate of all clear zones object.In an embodiment, step S404 will calculate described Area-weighted mean flow rate Bavg according to following formula:
Bavg=(B1×A1+B2×A2)/(A1+A2)。
It is example that this embodiment be take two clear zone objects 602 and 604, and in having the actual example of more than two clear zone object, the account form of Area-weighted brightness can also this be analogized.
Finally, in step S406, the present invention will at least adjust the backlight illumination of described image according to described Area-weighted mean flow rate.Generally speaking, because human vision sense organ tendency is noted the larger object of area in picture, therefore, the present invention be take the area of object and as basis, is adjusted backlight illumination and can obtain quite desirable effect.
The present invention is not limited only to according to Area-weighted mean flow rate, adjust merely the backlight illumination of image.In other words, in certain embodiments, when adjusting the backlight illumination of described image according to Area-weighted mean flow rate as mentioned before, the present invention still can adjust according to dynamic backlight control technology the backlight illumination (way of backlight illumination that wherein, dynamic backlight control technology is adjusted described image is nothing more than the overall brightness mean value according to image, brightness maximal value or according to both various linearities or nonlinear combination) of described image.In particular, in certain embodiments, according to described Area-weighted mean flow rate, adjusting the degree of image backlight illumination (anticipates, account for the proportion of final adjustment parameter, for example 0.6), for example, be special ratios (being 3:2) with adjusting according to dynamic backlight control technology between the degree (this means, account for the proportion of final adjustment parameter, 0.4) of image backlight illumination.
Backlight illumination adjusting gear
Except aforesaid backlight brightness regulation method, the present invention also provides a kind of backlight illumination adjusting gear.Fig. 7 is the backlight illumination adjusting gear schematic diagram of the embodiment of the present invention.In an embodiment, backlight illumination adjusting gear 700 can independently operate or be integrated among image processor (not shown), and object is being adjusted the backlight illumination of backlight 750.Backlight illumination adjusting gear 700 of the present invention comprises detecting unit 710, computing unit 720 and adjustment unit 730, and wherein, each element can be carried out respectively each step of aforementioned backlight brightness regulation method 400 of the present invention.In particular, described detecting unit 710 can detect brightness value and surpasses a plurality of clear zones object that default brightness and area surpass preset area from image.Described computing unit 720 can described a plurality of clear zones object area be weight, calculate the Area-weighted mean flow rate of all clear zones object.Described adjustment unit 730 can at least adjust according to described Area-weighted mean flow rate the backlight illumination that backlight 750 shows described image.
As previous embodiment, the present invention is not limited only to according to Area-weighted mean flow rate, adjust merely the backlight illumination of image.In other words, in certain embodiments, when adjusting the backlight illumination of described image according to Area-weighted mean flow rate as mentioned before, the present invention still can adjust according to dynamic backlight control technology the backlight illumination (way of backlight illumination that wherein, dynamic backlight control technology is adjusted described image is nothing more than the overall brightness mean value according to image, brightness maximal value or according to both various linearities or nonlinear combination) of described image.In particular, in certain embodiments, according to described Area-weighted mean flow rate, adjusting the degree of image backlight illumination (anticipates, account for the proportion of final adjustment parameter, for example 0.6), for example, be special ratios (being 3:2) with adjusting according to dynamic backlight control technology between the degree (this means, account for the proportion of final adjustment parameter, 0.4) of image backlight illumination.The feature of backlight illumination adjusting gear of the present invention is consistent with effect and the aforesaid backlight brightness regulation method of the present invention, and for saving space, its details will repeat no more.
Though the present invention discloses as above with preferred embodiment; so it is not in order to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (8)
1. a backlight brightness regulation method, comprising:
From image, detect brightness value and over default brightness and area, surpass a plurality of clear zones object of preset area;
The area of described a plurality of clear zones object of take is weight, calculates the Area-weighted mean flow rate of all clear zones object; And
At least according to described Area-weighted mean flow rate, adjust the backlight illumination of described image.
2. backlight brightness regulation method according to claim 1, also comprises:
According to dynamic backlight control technology, adjust the backlight illumination of described image simultaneously.
3. backlight brightness regulation method according to claim 2, wherein dynamic backlight control technology comprises: the backlight illumination of adjusting described image according to the mean value of the overall brightness of described image; Or the maximal value of the overall brightness of the described image of foundation is adjusted the backlight illumination of described image; Or above combination.
4. backlight brightness regulation method according to claim 2, wherein, adjust the degree of the backlight illumination of described image according to described Area-weighted mean flow rate, and according to dynamic backlight control technology, adjust between the degree of backlight illumination of described image and be special ratios.
5. a backlight illumination adjusting gear, comprising:
Detecting unit, surpasses a plurality of clear zones object of preset area in order to detect brightness value from image over default brightness and area;
Computing unit, is weight in order to take the area of described a plurality of clear zones object, calculates the Area-weighted mean flow rate of all clear zones object; And
Adjustment unit, in order at least to adjust according to described Area-weighted mean flow rate the backlight illumination that backlight shows described image.
6. backlight illumination adjusting gear according to claim 5, wherein said backlight illumination adjusting gear is also in order to adjust the backlight illumination of described image simultaneously according to dynamic backlight control technology.
7. backlight illumination adjusting gear according to claim 6, wherein dynamic backlight control technology comprises: the backlight illumination of adjusting described image according to the mean value of the overall brightness of described image; Or the maximal value of the overall brightness of the described image of foundation is adjusted the backlight illumination of described image; Or above combination.
8. backlight illumination adjusting gear according to claim 6, wherein, adjust the degree of the backlight illumination of described image according to described Area-weighted mean flow rate, and according to dynamic backlight control technology, adjust between the degree of backlight illumination of described image and be special ratios.
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| CN201210293172.3A CN103594061A (en) | 2012-08-17 | 2012-08-17 | Adjustment method and device for backlight luminance |
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| CN107818762A (en) * | 2016-09-14 | 2018-03-20 | 上海顺久电子科技有限公司 | A kind of subregion method for controlling backlight thereof and picture processing chip |
| CN107886904A (en) * | 2016-09-29 | 2018-04-06 | 上海顺久电子科技有限公司 | Backlight subarea control method and device |
| CN107886905A (en) * | 2016-09-29 | 2018-04-06 | 上海顺久电子科技有限公司 | Backlight subarea control method and device |
| CN107909970A (en) * | 2017-12-29 | 2018-04-13 | 晨星半导体股份有限公司 | Display device and its corresponding local dimming driving method |
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Application publication date: 20140219 |