CN109887468A - A kind of liquid crystal display dynamic light adjustment method based on image local feature - Google Patents
A kind of liquid crystal display dynamic light adjustment method based on image local feature Download PDFInfo
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Abstract
The present invention relates to technical field of liquid crystal display, and in particular to a kind of liquid crystal display dynamic light adjustment method based on image local feature.The following steps are included: A) input picture is analyzed；B subregion back light source brightness BL) is determinedx,y；C) BMA method simulation backlight distribution；D pixel compensation value) is determined；E dim factor K) is obtained according to determining backlight illuminationx,y, F) and according to dim factor generation backlight LED pulse-width control signal, it is sent into LED driving；G pixel adjustment signal) is obtained according to pixel compensation value, by adjustment signal input liquid crystal display panel LCD driving.The invention has the benefit that making regional area brightness be guaranteed, while details will not lose；The especially details of highlighted regional area and high contrast regional area will not lose；Whole image contrast is improved, is distorted small after light modulation, and fractional energy savings is high.
Description
Technical field
The present invention relates to technical field of liquid crystal display, and in particular to a kind of liquid crystal display dynamic based on image local feature
Light-dimming method.
Background technique
The backlight module of liquid crystal display is the main source of system energy consumption.When traditional liquid crystal display operation, backlight
With firm power output, this results in backlight to be always on always.When showing darker picture, since backlight is all lighted and liquid
Brilliant leakage problem causes the brightness of dark picture excessively high.This makes that the contrast of liquid crystal display is lower and power consumption is larger.And it moves
State dims algorithm can adjust the brightness of backlight, i.e., when showing darker picture, Ke Yishi according to the content of display image in real time
When the brightness for reducing backlight, or even when showing completely black picture, backlight is closed.Power consumption can be so reduced, contrast is promoted.
There are two solution, overall situation light modulation and local dimmings for dynamic light adjustment.Using the liquid crystal display of global dimming arrangement
Device structure is simple, but display effect is far away from local dimming effect.Local dimming needs backlight module being divided into independent control
Different zones, according to input picture feature respectively determine each region backlight size；It is not only able to effectively inhibit light leakage, mention
Contrast is risen, and liquid crystal display power consumption is greatly reduced.Subregion light modulation can be divided into two class of straight-down negative and side entering type, side entering type
Light adjusting system can be made more frivolous, but straight-down negative has better high dynamic range performance.This is mainly for straight-down negative subregion tune
Light.
Subregion dynamic light adjustment is to carry out sectional image processing to input picture, counts the characteristics of image of each subregion, thus
Go out the suitable backlight value of each subregion according to these feature calculations.And the backlight value of each subregion is determined by the LED light in subregion
It is fixed, it can be set to different brightness values in the LED light of synchronization different subregions, export different backlight intensities.Relative to
For the whole backlight control of overall situation light modulation, the determining backlight illumination of subregion light modulation has preferably counted the provincial characteristics of image
Value, it is ensured that preferably display effect and energy-saving effect.It can be by subregion according to placement location of the LED light source in backing structure
Light modulation is divided into two ways: the light modulation of straight-down negative subregion and side go out the light modulation of formula subregion.Present invention is generally directed in straight-down negative point
Area's light modulation.LED light source is located at the underface of liquid crystal display panel in the light modulation of straight-down negative subregion, by the LED for controlling each subregion
Brightness realize subregion light modulation.The key of dynamic light adjustment algorithm is accurately to extract the luminance information of picture material, so as to root
Suitable backlight corrected parameter is calculated according to luminance information.The reduction of backlight is beneficial to energy conservation, but excessively reduction can reduce figure
The display quality of picture.
Applicant has found Chinese patent CN103778898B, a kind of liquid crystal display LED backlight dynamic light adjustment by retrieval
Device, publication date are on July 6th, 2016, are and the immediate prior art of the application comprising: Central Control Module is used for
It receives picture signal and liquid crystal signal value and LED backlight gray value BL is obtained by dynamic light adjustment algorithm, liquid crystal signal value is sent
To liquid crystal driver module, LED backlight gray value BL is sent to LED drive module；Liquid crystal driver module is used for according to liquid crystal signal
The liquid crystal molecule deflection of value control liquid crystal display panel, liquid crystal display panel are divided into M × 1 rectangular sub-area；Subregion time-sequence control module
For all liquid crystal molecules when i-th of rectangular sub-area of liquid crystal display panel, according to liquid crystal signal value, by the ti time, all deflection is finished
LED commencing signal is sent afterwards to LED drive module；LED drive module is used for according to the driving of LED commencing signal and the i-th subregion pair
The LED backlight answered starts to shine, and fluorescent lifetime and corresponding LED backlight gray value are linear.Its dynamic light adjustment device can
Effectively to solve the problems, such as film flicker.But it not can solve backlight and display content disconnects, and backlight is caused to reduce display quality, thin
The problem of section is lost.
Summary of the invention
The technical problem to be solved by the present invention is there is display quality in LED display backlight adjusting method in the prior art
Low details is distorted serious technical problem.Propose a kind of liquid crystal display dynamic light adjustment method based on image local feature.This
Light-dimming method of the application based on local feature in correspondence image region then utilizes image local area pixel in correspondence image region
The larger feature of point correlation, overcoming global light-dimming method to a certain degree causes backlight to decline regional area luminance shortage, carefully
The shortcomings that section is lost, the comprehensive balance for promoting both energy consumption and picture quality.
In order to solve the above technical problems, the technical solution used in the present invention are as follows: a kind of liquid based on image local feature of
Crystalline substance shows dynamic light adjustment method, comprising the following steps: A) image is inputted into on-site programmable gate array FPGA, and it is converted into gray scale
Image I；B) according to the subregion of direct-light type LED backlight mould group, the subregion I of corresponding gray level image I is obtainedx,y, x, y >=1；C) make
With slip window sampling, the feature of each sectional image block is extracted；D) according to the feature of each sectional image block, each subregion is set
The initial backlight value BL_initial of image blockx,yWith offset BL_compensationx,y, by initial backlight value and offset
Sum as backlight value BLx,y；E) according to the backlight value BL of each subregionx,y, determine the dim factor of the subregion backlight module
Kx,y；F) according to subregion dim factor Kx,yThe pulsewidth modulation pwm signal of backlight LED in each subregion backlight module is set, and
It is sent into the LED drive module of corresponding backlight module；G the brightness for) estimating each pixel of image to be processed, utilizes liquid crystal compensation
Algorithm obtains the brightness adjusting signal of each pixel, is sent into liquid crystal control module.
Preferably, the feature for extracting each sectional image block in step C includes: to extract each subregion gray level image block
Ix,yMaximum local gray level mean value MAX (Avg (Ix,y(i, j))), most generous local difference MAX (σ (Ix,y(i, j))) and most
High-gray level value MAX (Ix,y), wherein (i, j) indicates subregion Ix,yThe coordinate of middle pixel.
Preferably, in step D, initial backlight value BL_initialx,y=MAX (Avg (Ix,y(i,j)))；Offset Its
In, β is regulatory factor, β >=0, for adjusting the amplitude size of contrast metric control initial backlight compensation.
Preferably, determining dim factor K in step Ex,yMethod are as follows:Wherein, n is ash
Spend the bit wide of image I, usually 8, unit bit.
Preferably, the size of the window of the slip window sampling used in step C, is determined by input picture feature
, size is (2k+1) × (2k+1) pixel, wherein empirical parameter k is positive integer, and value is set manually.The value of k is smaller
Image local feature can be more extracted, but will increase calculation amount.
Preferably, the brightness of each pixel of image to be processed is estimated in step G using backlight light mixing processing method.
Preferably, the backlight light mixing processing method is light spread function method or fuzzy-method of diffusion.
Preferably, liquid crystal compensation algorithm is linearly or nonlinearly backoff algorithm in step G.
Substantial effect of the invention is: in the case that image grayscale is unevenly distributed in correspondence image region, based on pair
The dim factor K that the local mean value and local variance of each gray level image block obtainx,yLocal office feature in correspondence image region
Light modulation is so that regional area brightness is guaranteed, while details will not lose；Especially highlighted regional area and high contrast
The details of regional area will not lose；Whole image contrast is improved, is distorted small after light modulation, and fractional energy savings is high.
Detailed description of the invention
Fig. 1 is one dynamic light adjustment method flow diagram of embodiment.
Fig. 2 is one device schematic block diagram of embodiment.
Fig. 3 is one image block schematic diagram of embodiment and backlight module subregion schematic diagram.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, a specific embodiment of the invention is further described in detail.
Embodiment one:
A kind of liquid crystal display dynamic light adjustment method based on image local feature, as shown in Figure 1, the think of of the present embodiment method
Road is as follows: A) input picture is analyzed；B subregion back light source brightness BL) is determinedx,y；C) BMA method simulation backlight distribution；D) really
Determine pixel compensation value；E dim factor K) is obtained according to determining backlight illuminationx,y；F backlight LED arteries and veins) is generated according to dim factor
Width control signal, is sent into LED driving；
G pixel adjustment signal) is obtained according to pixel compensation value, by adjustment signal input liquid crystal display panel LCD driving.
Specific steps are as follows:
A image) is inputted into on-site programmable gate array FPGA, and is converted into gray level image I.
B) according to the subregion of direct-light type LED backlight mould group, the subregion I of corresponding gray level image I is obtainedx,y, x, y >=1.
C) use slip window sampling, extract the feature of each sectional image block, the size of the window of slip window sampling, be by
What input picture feature determined, size is (2k+1) × (2k+1) pixel, wherein empirical parameter k is positive integer, and value is by people
Work setting.Window is from each subregion gray level image block Ix,yThe upper left corner start to be moved horizontally to the upper right corner, and stride is 1 picture
Element；Window moves 1 pixel still further below, continues to move horizontally, and stride is 1 pixel；Above-mentioned window movement law is repeated, until
Window traverses entire subregion gray level image block Ix,y, the gray level image block I for including in each window is sought respectivelyx,yThe ash of (i, j)
Spend mean value Avg (Ix,y(i, j)) and variances sigma (Ix,y(i, j)), i.e. gray level image block Ix,yLocal mean value and local variance；Comparison
Obtain each subregion gray level image block Ix,yMaximum gray average MAX (Avg (Ix,y(i, j))), maximum variance value MAX (σ (Ix,y
(i, j))) and maximum gradation value MAX (Ix,y)。
D) according to the feature of each sectional image block, the initial backlight value BL_initial of each sectional image block is setx,y
With offset BL_compensationx,y, using initial backlight value and the sum of offset as backlight value BLx,y。
E) according to the backlight value BL of each subregionx,y, determine the dim factor K of the subregion backlight modulex,y, determine light modulation because
Sub- Kx,yMethod are as follows:Wherein, n is the bit wide of gray level image I, general value 8, unit bit.
F) according to subregion dim factor Kx,yThe pulsewidth modulation pwm letter of backlight LED in each subregion backlight module is set
Number, and it is sent into the LED drive module of corresponding backlight module.
G the brightness for) estimating each pixel of image to be processed, when utilization dynamic light adjustment method changes back light source brightness
Afterwards, it needs to compensate liquid crystal pixel, maintains brightness of image constant.A kind of scheme is to accurately calculate back by light spread function
Light projection to each pixel light luminance, then with this offset value calculation size.However, being needed with light spread function method
Between between the quantity of optical thin film between the distance between known single led brightness, LED, backlight and liquid crystal, optical thin film
Away from etc..Usual this method is not only complicated for operation, but also operand and complexity are high, do not have operability.Another scheme
It is fuzzy-diffusion method (Blur Mask Approach, BMA), this method can carry out backlight matrix using low-pass filter
Filtering, by multiple extension and low-pass filtering it is fuzzy after, simulate with the distribution of practical backlight closely as a result, and with
This determines pixel compensation value.(7) liquid crystal compensation algorithm is utilized, the compensated adjustment signal of each pixel is obtained, is sent into liquid
Crystal panel (LCD) driving, adjusts the aperture of the liquid crystal pixel of liquid crystal display panel (LCD), reaches the mesh for adjusting each pixel brightness
's.The liquid crystal compensation algorithm is using linear compensation method or non-linear compensation method.
As shown in Fig. 2, one device schematic block diagram of embodiment, the hardware system of the design include flash memory (Flash
Memory), synchronized SRAM (SSRAM), field programmable gate array (FPGA), LED drive module, liquid crystal display panel
LCD drive module, liquid crystal display panel LCD, backlight module.Image source is stored in flash memory (Flash memory), synchronize it is static with
Machine memory SSRAM is used for the caching of data during dynamic light adjustment.Image is analyzed in FPGA and runs this programme design
Algorithm, generate backlight control signal and LCD Controlling signal.Control signal input liquid crystal display panel LCD driving is driven with LED
The LED backlight for controlling liquid crystal display panel control liquid crystal display panel LCD and backlight module shows image.
Referring to Fig. 3, (b) indicate this example backlight module, be divided into 6*11 subregion, each subregion have one it is individually controllable
LED backlight.(a) indicate at the scene in programmable gate array (FPGA), image according to the partitioning scenario of backlight module also by
Accordingly it is divided into 6*11 subregion, the coordinate representation (x, y) of each subregion.In each subregion, as sliding window slides, obtain
Different regional areas, regional area coordinate representation are (i, j).So the mean value table of the regional area (i, j) of subregion (x, y)
It is shown as Avg (Ix,y(i,j)).The variance of the regional area (i, j) of subregion (x, y) is expressed as σ (Ix,y(i,j)).Subregion (x, y)
Maximum gradation value is expressed as MAX (Ix,y)。
It is special compared with method of the invention has been carried out image displaying quality with the error modification method being most widely used at present
The image for not having chosen different scenes in 4 has carried out emulation testing, and referring to Fig. 3, direct-light type LED backlight mould group is 6 × 11 subregions,
Input picture is also accordingly divided into 6 × 11 subregions；What emulation experiment carried out in Matlab R2014a environment, all tests
The resolution ratio of image is 1920*1080, this evaluation scheme has evaluated different scenes image after applying two kinds of light modulation algorithms respectively
The PSNR value for showing image, to measure the image displaying quality winding level after this algorithm process；It is shown in Table 1.
Table 1
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (8)
1. a kind of liquid crystal display dynamic light adjustment method based on image local feature, which is characterized in that
The following steps are included:
A image) is inputted into on-site programmable gate array FPGA, and is converted into gray level image I；
B) according to the subregion of direct-light type LED backlight mould group, the subregion I of corresponding gray level image I is obtainedX, y, x, y >=1；
C slip window sampling) is used, the feature of each sectional image block is extracted；
D) according to the feature of each sectional image block, the initial backlight value BL_initial of each sectional image block is setX, yAnd benefit
Repay value BL_compensationX, y, using initial backlight value and the sum of offset as backlight value BLX, y；
E) according to the backlight value BL of each subregionX, y, determine the dim factor K of the subregion backlight moduleX, y；
F) according to subregion dim factor KX, yThe pulsewidth modulation pwm signal of backlight LED in each subregion backlight module is set, and
It is sent into the LED drive module of corresponding backlight module；
G) estimate that the brightness of each pixel of image to be processed obtains the brightness of each pixel using liquid crystal compensation algorithm
Adjustment signal is sent into liquid crystal control module.
2. a kind of liquid crystal display dynamic light adjustment method based on image local feature according to claim 1, feature exist
In,
The feature that each sectional image block is extracted in step C includes: to extract each subregion gray level image block IX, yMaximum part
Gray average MAX (Avg (IX, y(i, j))), most generous local difference MAX (σ (IX, y(i, j))) and maximum gradation value MAX
(IX, y), wherein (i, j) indicates subregion IX, yThe coordinate of middle pixel.
3. a kind of liquid crystal display dynamic light adjustment method based on image local feature according to claim 2, feature exist
In,
In step D, initial backlight value BL_initialX, y=MAX (Avg (IX, y(i, j)))；
Offset Wherein, β is regulatory factor, β >=0, for adjusting contrast metric control initial backlight compensation
Amplitude size.
4. a kind of liquid crystal display dynamic light adjustment method based on image local feature according to claim 2 or 3, feature
It is,
In step E, dim factor K is determinedX, yMethod are as follows:
Wherein, n is the bit wide of gray level image I.
5. a kind of liquid crystal display dynamic light adjustment method based on image local feature according to claim 1 or 2 or 3,
It is characterized in that,
The size of the window of the slip window sampling used in step C is determined by input picture feature, and size is (2k+
1) × (2k+1) pixel, wherein empirical parameter k is positive integer, and value is set manually.
6. a kind of liquid crystal display dynamic light adjustment method based on image local feature according to claim 1 or 2 or 3,
It is characterized in that,
The brightness of each pixel of image to be processed is estimated in step G using backlight light mixing processing method.
7. a kind of liquid crystal display dynamic light adjustment method based on image local feature according to claim 6, feature exist
In,
The backlight light mixing processing method is light spread function method or fuzzy-method of diffusion.
8. a kind of liquid crystal display dynamic light adjustment method based on image local feature according to claim 1 or 2 or 3,
It is characterized in that,
Liquid crystal compensation algorithm is linearly or nonlinearly backoff algorithm in step G.
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| CN115035865B (en) * | 2022-05-05 | 2024-05-17 | 石家庄市京华电子实业有限公司 | Light valve assembly partition dimming method based on LED backlight |
| CN114822424A (en) * | 2022-06-06 | 2022-07-29 | 深圳市帝晶光电科技有限公司 | Low-power-consumption MINI LED display screen based on FPGA |
| CN115240606A (en) * | 2022-07-30 | 2022-10-25 | 福州大学 | Dynamic dimming method for twice backlight correction area based on maximum value method |
| CN115657367A (en) * | 2022-10-19 | 2023-01-31 | 长春希达电子技术有限公司 | High-partition dynamic dimming method for LED backlight module |
| CN115657367B (en) * | 2022-10-19 | 2024-01-05 | 长春希达电子技术有限公司 | High-partition dynamic dimming method for LED backlight module |
| CN116168652A (en) * | 2022-12-26 | 2023-05-26 | 武汉Tcl集团工业研究院有限公司 | Image display method, device, electronic equipment and computer readable storage medium |
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