CN104810007B - Image processing circuit and its method - Google Patents
Image processing circuit and its method Download PDFInfo
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- CN104810007B CN104810007B CN201410043796.9A CN201410043796A CN104810007B CN 104810007 B CN104810007 B CN 104810007B CN 201410043796 A CN201410043796 A CN 201410043796A CN 104810007 B CN104810007 B CN 104810007B
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Abstract
A kind of image processing circuit and its method.Described image process circuit includes optical sensor, image control unit, gamma curve look-up table, backlight control unit and graphics processing unit.Optical sensor sense ambient light intensity and output intensity signal.Image control unit receives picture signal, and determines the image brightness values corresponding to the first view data of picture signal according to strength signal.Gamma curve look-up table exports the brightness value signal of correspondence image brightness value.Backlight control unit exports the backlight illumination signal of correspondence image brightness value.Graphics processing unit is according to brightness value signal and the second view data of backlight illumination signal output the first view data of correspondence.
Description
Technical field
The invention relates to a kind of Display Technique, and in particular to a kind of image processing circuit and its method.
Background technology
Current electronic product in order to allow the user picture shown by screen can be watched under different environment light sources,
Therefore optical sensor can be often configured with most electronic product（Light Sensor）To sense around electronic product
Environment light source changes and adjusts the backlight illumination of screen.However, in the case that user is too strong in environment light source intensity（For example
Electronic product is used out of doors）, come than the brightness of image that screen is presented in itself due to the screen specular light of electronic product
By force.Therefore, user may only see the surrounding environment that screen is reflected, and cannot see the picture shown by screen clearly.It is special
It is not that the problem that user does not see Chu's picture can be more serious when screen image content to display is dark.Current,
It is to improve the backlight illumination of screen, to reduce the reflected light of screen, but the very power consumption of the above-mentioned practice and cannot becomes picture
Must understand.Therefore, how to make the display of picture is not influenceed a then emphasis as Display Technique by ambient light.
The content of the invention
The present invention provides a kind of image processing circuit and its method, can be according to environment light source accommodation picture signal
Brightness of image is lifting image quality.
Image processing circuit of the invention is applied to electronic installation.Described image process circuit includes optical sensor, image
Control unit, gamma curve look-up table, backlight control unit and graphics processing unit.Optical sensor is strong to sense ambient light
Degree and output intensity signal.Image control unit couples optical sensor.Image control unit receives picture signal and according to intensity
Image brightness values corresponding to first view data of signal deciding picture signal.Gamma curve look-up table couples image control list
Unit.Gamma curve look-up table is controlled by the brightness value signal that image control unit exports correspondence image brightness value.Backlight control list
Unit's coupling image control unit.Backlight control unit is controlled by the backlight illumination that image control unit exports correspondence image brightness value
Signal.Graphics processing unit couples gamma curve look-up table and backlight control unit.Graphics processing unit is according to brightness value signal
And the second view data of backlight illumination signal output the first view data of correspondence.
Image processing method of the invention is applied to electronic installation.Described image processing method comprises the following steps.Sensing
Ambient light intensity and output intensity signal.Receive picture signal and the first view data of picture signal is determined according to strength signal
Corresponding image brightness values.Export the brightness value signal of correspondence image brightness value.The backlight for exporting correspondence image brightness value is bright
Degree signal.According to brightness value signal and the second view data of backlight illumination signal output the first view data of correspondence.
Based on above-mentioned, image processing circuit of the invention and its method can adaptively be determined according to the intensity of environment light source
The image brightness values that picture signal is presented.In addition, image processing circuit of the invention and its method can be shielded by adjusting
The backlight illumination of curtain increases the image quality shown by the screen of electronic installation with the color saturation of picture signal.The opposing party
Face, image processing circuit of the invention and its method can determine image according to electronic installation under different electric power function situations
The image brightness values of signal.Consequently, it is possible to image processing circuit of the invention and its method can solve user be seen under high light
The problem of screen of electronic device display content is not known, and lifts the quality of on-screen displays.
It is that features described above of the invention and advantage can be become apparent, special embodiment below, and coordinate institute's accompanying drawings
It is described in detail below.
Brief description of the drawings
Fig. 1 shows a kind of schematic diagram of image processing circuit of one embodiment of the invention；
Fig. 2A~2D is shown respectively a kind of schematic diagram of adjustment picture signal grey decision-making of one embodiment of the invention；
Fig. 3 shows the brightness curve that a kind of picture signal of one embodiment of the invention is presented under different environment light sources
Schematic diagram；
Fig. 4 shows a kind of schematic diagram of image processing circuit of another embodiment of the present invention；
Fig. 5 shows a kind of flow chart of image processing method of one embodiment of the invention；
Fig. 6 shows a kind of flow chart of image processing method of another embodiment of the present invention.
Description of reference numerals：
100、400：Image processing circuit；
102、402：Optical sensor；
403：Saturation degree look-up table；
104、404：Image control unit；
105、405：Image analyzing unit；
106、406：Gamma curve look-up table；
108、408：Backlight control unit；
110、410：Graphics processing unit；
BL、BL1：Backlight illumination signal；
BR、BR1：Brightness value signal；
IA：Graphical analysis signal；
IM、IM1：Picture signal；
IN：Strength signal；
ID1、ID11：First view data；
ID2、ID21：Second view data；
SA：Saturation signal；
S502~S510, S602~S618：Step；
30th, 32,201~203,211~213,200,210,220,230：Curve.
Specific embodiment
Fig. 1 shows a kind of schematic diagram of image processing circuit of one embodiment of the invention.Image processing circuit 100 is applied to
Smart mobile phone（Smart phone）, personal digital assistant（Personal Digital Assistant, abbreviation PDA）Mobile phone or
Person's panel computer（Table PC）Deng electronic installation.Image processing circuit 100 includes optical sensor 102, image control unit
104th, image analyzing unit 105, gamma curve look-up table 106, backlight control unit 108 and graphics processing unit 110.
Optical sensor 102 is used for sensing the environment light source intensity around electronic installation and accordingly output intensity signal
IN, e.g. near-infrafed photodiodes（Photo Diode）, photoelectric crystal or other there is the electronic component of light sensation brake.When making
When user uses electronic installation out of doors, the environment light source that optical sensor 102 is sensed is stronger, i.e., optical sensor 102 is sensed
To the light source of high intensity；When user indoors use electronic installation when, the environment light source that optical sensor 102 is sensed compared with
Weak, i.e., optical sensor 102 senses low intensive light source.Therefore, optical sensor 102 can correspond to different environment light source intensity
And export different strength signal IN.
Image analyzing unit 105 receives picture signal IM（Can for example be received by the input of electronic installation）After can analyze
The image distribution of picture signal IM, and graphical analysis signal IA to image control unit 104 is accordingly provided.Wherein, image point
Analysis signal IA is, for example, the image gray-scale level histogram of picture signal IM（Histogram）Or the GTG of graphical analysis signal IA is average
Value.
Image control unit 104 couples optical sensor 102 with receiving intensity signal IN, coupling image analyzing unit 105 with
Receive graphical analysis signal IA.In the present embodiment, image control unit 104 can determine picture signal IM according to strength signal IN
The first view data ID1 image procossing mode, for example image control unit 104 can according to according to strength signal IN using strong
Degree signal IN and/or graphical analysis signal IA determines the image brightness values corresponding to the first view data ID1 of picture signal IM.
When image control unit 104 is determined corresponding to the first view data ID1 of picture signal IM using strength signal IN
Image brightness values when, image control unit 104 can be according to can recognize difference（JustNoticeable Difference, referred to as
JND）Determine that the image brightness values of view data, i.e. image control unit 104 can adjust each grey decision-making institute according to ambient light intensity
Corresponding brightness value, so as to multiple low-light level grey decision-makings can understand recognize, wherein the grey decision-making after adjustment is each picture number
According to（Such as ID1）Corresponding image brightness values.Assuming that grey decision-making scope is 0~255, then above-mentioned low-light level grey decision-making can be ash
Grey decision-making in positive and negative 4 GTG of rank value 32.
When image control unit 104 determines the first view data ID1 institutes of picture signal IM using graphical analysis signal IA
During corresponding image brightness values, image control unit 104 can judge what picture signal IM was transmitted according to graphical analysis signal IA
Image type, to determine the processing mode of picture signal IM.For example, when image control unit 104 judges picture signal IM to pass
When sending a high-brghtness picture images, i.e. the most of correspondence high brightness grey decision-making of multiple images data of picture signal IM（Such as grey decision-making 171
~255）, then image control unit 104 can improve the luminance difference between high brightness grey decision-making, so that high-brghtness picture images become
Obtain clearly；When luminance picture during image control unit 104 judges picture signal IM for transmission one, i.e. the multiple of picture signal IM
Intensity gray scale value in the most of correspondence of view data（Such as grey decision-making 86~170）, brightness is grey during image control unit 104 can be improved
Luminance difference between rank value；When image control unit 104 judges picture signal IM for one low-luminosity picture of transmission, i.e.,
Intensity gray scale value in the most of correspondence of the multiple images data of picture signal IM（Such as grey decision-making 0~85）, image control unit 104
The luminance difference between low-light level grey decision-making can be improved.
Then, image control unit 104 can couple gamma curve look-up table 106 and backlight control unit 108, to control gal
The determined image brightness values corresponding with backlight control unit 108 of agate curve look-up table 106 and export brightness value signal BR respectively
And backlight illumination signal BL.The coupling gamma curve of graphics processing unit 110 look-up table 106 and backlight control unit 108, and according to
Correspond to the second view data ID2 of the first view data ID1 according to brightness value signal BR and backlight illumination signal BL outputs.Its
In, backlight illumination signal BL that image processing circuit 100 can be exported by backlight control unit 108 adjusts electronic installation
The brightness of backlight module, and the gamma curve corresponding to picture signal IM can be found by gamma curve look-up table 106, so that
Can see the content shown by the screen of electronic installation clearly under different environment light sources in user.
In an embodiment of the present invention, whether image processing circuit 100 can have external power supply to determine according to electronic installation
The tupe of picture signal IM, and the brightness adjustment mode of adjustment picture signal IM is determined according to corresponding tupe, with
Determine the image brightness values corresponding to adjustment picture signal IM.In other words, image processing circuit 100 can first judge electronic installation mesh
Before be to operate or operated according to external electric power according to electronic installation battery electric power in itself, further to determine image
The tupe of signal IM.
First, it is assumed that electronic installation does not have external power supply, i.e. electronic installation according to the battery electric power of itself to operate, now
Image processing circuit 100 is set as dc source pattern.Then, it is more than or equal to when optical sensor 102 senses ambient light intensity
First critical value（Such as 800lux）When, represent that user uses electronic installation, image control out of doors or close to the place of door and window
Unit processed 104 can find the gamma curve of the current strength signal IN of correspondence by controlling gamma curve look-up table 106, so that figure
After picture signal IM is adjusted（The picture signal that i.e. multiple second view data ID2 are constituted）With difference, i.e. image can be recognized
The meeting of control unit 104 determines the image brightness values corresponding to the first view data ID1 of picture signal IM according to strength signal IN,
So that the grey decision-making corresponding to the second view data ID2（Brightness value after adjusting）Different from the first view data ID1 institutes
Corresponding grey decision-making（I.e. original brightness value）.
Fig. 2A shows a kind of schematic diagram of adjustment picture signal grey decision-making of one embodiment of the invention.Refer to Fig. 1 and figure
2A, in this example, it is assumed that grey decision-making scope is 0~255, the corresponding inputs of transverse axis representative image signal IM of wherein Fig. 2A
Grey decision-making, the longitudinal axis of Fig. 2A represents the corresponding output grey decision-makings of picture signal IM after adjustment.Curve 200 represents not adjusted
Gamma curve,（I.e. original gamma curve）, curve 210,220 and 230 represent respectively environment light source intensity as 3000lux,
Gamma curve corresponding to 5000lux and 8000lux.According to above-mentioned, as the intensity of environment light source is stronger, picture signal IM
Need the amplitude of adjustment also bigger, so that low-light level grey decision-making（Such as in the range of positive and negative 4 GTG of grey decision-making 32）Can understand
Identification.
When optical sensor 102 senses ambient light intensity less than the first critical value, represent that user indoors uses electricity
Sub-device, i.e. user do not have the interference of ambient light, therefore image control unit 104 will not be to the bright of the first view data ID1
Angle value is adjusted, i.e. grey decision-making corresponding to the second view data ID2（Brightness value after adjusting）With the first view data
Grey decision-making corresponding to ID1（That is, original brightness value）It is identical.For example, when user is in not strong indoor of environment light source
During using electronic installation, user would not see Chu's screen-picture because of the interference of ambient light.Therefore in other words, at image
Reason circuit 100 to picture signal IM treatment, and will not directly output it.Also, in order to save the electric power of electronic installation
Consumption, can be set as low power consumption pattern by image processing circuit 100（Such as off-mode, park mode）.
On the other hand, it is assumed that electronic installation receives external power supply, i.e. electronic installation to be come according to the electric power of external power supply
Running, now image processing circuit 100 is set as AC power pattern.Then, to sense ambient light intensity small for optical sensor 102
When the first critical value, represent that user does not have the interference of ambient light, therefore image using electronic installation, i.e. user indoors
Control unit 104 will not be adjusted according to strength signal IN to the brightness value of the first view data ID1, but can be according to image
Signal Analysis IA determines the image brightness values corresponding to the first view data ID1 of picture signal IM, to lift image quality.
Furthermore, it is understood that the graphical analysis signal IA that image processing circuit 100 can be provided by image analyzing unit 105 is obtained
Know the image type that picture signal IM is transmitted, and can be according to the image type of picture signal IM to the first of picture signal IM
Image brightness values corresponding to view data ID1 are adjusted.Fig. 2 B~2D is shown respectively a kind of tune of one embodiment of the invention
The schematic diagram of whole picture signal grey decision-making.Refer to Fig. 1 and Fig. 2 B~2D, the transverse axis representative image signal IM of wherein Fig. 2 B~2D
Corresponding input grey decision-making, the longitudinal axis of Fig. 2 B~2D represents the output grey decision-making corresponding to the picture signal IM after adjustment.
In Fig. 2 B~2D, curve 201,202,203 represents not adjusted gamma curve, and curve 211,212,213 represents adjusted
Gamma curve.
When picture signal IM is high-brghtness picture images, image control unit 104 can determine picture signal IM according to curve 211
The first view data ID1 corresponding to brightness value so that the multiple that image control unit 104 can improve picture signal IM is high
Intensity gray scale value（Such as grey decision-making 171~255）Luminance difference each other so that the contrast of high brightness part is more in image
Substantially, so increase high brightness GTG details performance；When picture signal IM is middle luminance picture, image control unit 104
Can be according to the brightness value corresponding to the first view data ID1 of the decision picture signal of curve 212 IM, so that image control unit
104 can improve as signal IM multiple in intensity gray scale value（Such as grey decision-making 86~170）Luminance difference each other so that figure
The contrast of middle brightness part is more obvious as in, and then the details of intensity gray scale is showed in increase；When picture signal IM is low bright
During degree image, image control unit 104 can be determined corresponding to the first view data ID1 of picture signal IM according to curve 213
Brightness value, so that image control unit 104 can improve the difference between multiple low-light level grey decision-makings（As grey decision-making 0~
85）So that the contrast of low-light level part is more obvious in image, and then increases the details performance of low-light level GTG.
When optical sensor 102 senses ambient light intensity more than or equal to the first critical value and less than the second critical value（For example
2000lux）When, represent that user is using electronic installation, i.e., current environment light source to be subject to by open air close to the place of door and window
Light source influence and persistently change with the light source of interior.Now, due to electronic installation use environment and indoor moving to family
Outward, for the flatness that image shows, image processing circuit 100 can be same by the image type of environment light source and picture signal IM
When it is taken into consideration, to determine the processing mode of picture signal.That is, image control unit 104 can be believed according to intensity respectively
Number IN（Corresponding to environment light source）With graphical analysis signal IA（Corresponding to the image type of picture signal IM）Determine picture signal
Brightness value corresponding to the first view data ID1 of IM.Then, basis strength signal IN and graphical analysis signal IA is determined
Determine the image gain value GAL corresponding to brightness value come selection gist strength signal IN determine brightness value or according to graphical analysis letter
Number IA determine brightness value as picture signal IM the first view data ID1 corresponding to image brightness values.Wherein, image control
Unit processed 104 can using the brightness value corresponding to image gain value GAL the greater as picture signal IM the first view data ID1
Corresponding image brightness values.
The deciding means of image gain value GAL are will be described below, Fig. 3 is refer to.Fig. 3 shows the one of one embodiment of the invention
Plant the brightness curve schematic diagram that picture signal is presented under different environment light sources.Fig. 3 is refer to, the transverse axis of Fig. 3 represents ring
Environmental light source（Unit is lux）, the longitudinal axis of Fig. 3 represents specific grey-scale value（Such as grey decision-making 32）Corresponding brightness（Unit is nit）.
Curve 30 represents specific grey-scale value（Such as grey decision-making 32）Original brightness curve, curve 32 represents specific grey-scale value（Such as grey decision-making
32）Brightness curve after adjustment.Wherein relation of the curve 30 with 32 is for corresponding following equation：
(OGA/OGM)GAL=(OGA'/OGM)
Wherein, OGM is the maximum gray value of picture signal IM（For example：Grey decision-making 255）, OGA is appointing for picture signal IM
Meaning grey decision-making（Such as low-light level grey decision-making 32）And it is not equal to maximum gray value（Such as 255）, OGA' is the adjustment of picture signal IM
Grey decision-making（Such as curve 32）.
On the other hand, when optical sensor 102 senses ambient light intensity more than or equal to the second critical value, user is represented
Electronic installation is used out of doors, and image control unit 104 can be current strong by controlling gamma curve look-up table 106 to find correspondence
The gamma curve of degree signal IN, so that after picture signal IM is adjusted（The image letter that i.e. multiple second view data ID2 are constituted
Number）First picture number of picture signal IM can be determined according to strength signal IN with difference, i.e. image control unit 104 can be recognized
According to the image brightness values corresponding to ID1, so that the grey decision-making corresponding to the second view data ID2（Brightness value after adjusting）
Different from the grey decision-making corresponding to the first view data ID1（I.e. original brightness value）.
As shown in the above description, when electronic installation is operated according to external electric power, image control unit 104 can be passed according to light
Ambient light intensity that sensor 102 is sensed and the magnitude relationship of the first critical value and the second critical value determine picture signal IM
Image brightness values.In an alternative embodiment of the invention, when electronic installation is operated according to external electric power, image control unit
104 can not consider the magnitude relationship of ambient light intensity and the first critical value and the second critical value to determine the image of picture signal IM
Brightness value.In other words, image control unit 104 can find the first view data ID1 of picture signal IM according to strength signal IN
Corresponding brightness value（The first brightness reference value of correspondence）, and image control unit 104 can be looked for according to graphical analysis signal IA
To picture signal IM the first view data ID1 corresponding to brightness value（Corresponding to the second brightness reference value）, then according to first
Brightness reference value and the second brightness reference value determine the final brightness value corresponding to the first view data ID1 of picture signal IM.
In the present embodiment, the image brightness values of picture signal IM can be set as the first brightness by image control unit 104
The summation of reference value and the second brightness reference value.In other embodiments, image control unit 104 can be by the figure of picture signal IM
Image brightness value is set as that the first brightness reference value is multiplied by the summation after weighted value respectively with the second brightness reference value.It is noticeable
It is that the first brightness reference value can be adjusted with the weighted value setting of the second brightness reference value according to actual demand.
Fig. 4 shows a kind of schematic diagram of image processing circuit of another embodiment of the present invention.Image processing circuit 400 includes
Optical sensor 402, saturation degree look-up table 403, image control unit 404, image analyzing unit 405, gamma curve look-up table
406th, backlight control unit 408 and graphics processing unit 410.Wherein, light sensing 402, image control unit 404, image point
The working method of analysis unit 405, gamma curve look-up table 406, backlight control unit 408 and graphics processing unit 410 please join
Examine optical sensor 102, image control unit 104, the image analyzing unit 105, gamma curve in Fig. 1 image processing circuits 100
Look-up table 106, backlight control unit 108 and graphics processing unit 110, do not repeat herein.
By image processing circuit 400 compared with image processing circuit 100, saturation is further comprises in image processing circuit 400
Degree look-up table 403.Saturation degree look-up table 403 is coupled to image control unit 404, and exports saturation degree corresponding to image brightness values
Signal SA.Graphics processing unit 410 can be according to brightness value signal BR1, backlight illumination signal BL1 and saturation signal SA output
Corresponding to the second view data ID21 of the first view data ID11 of picture signal IM1.In this embodiment, image procossing list
Unit 410 exports the second view data ID21 according to saturation signal SA, and the second view data is set with according to saturation signal SA
Saturation degree corresponding to ID21.
Fig. 5 shows a kind of flow chart of image processing method of one embodiment of the invention.Fig. 5 is refer to, in the present embodiment
In, image processing method comprises the following steps.Sense ambient light intensity and output intensity signal（Step S502）.Receive image letter
Number and according to strength signal determine picture signal the first view data corresponding to image brightness values（Step S504）.Output is right
Answer the brightness value signal of image brightness values（Step S506）.Export the backlight illumination signal of correspondence image brightness value（Step
S508）.According to brightness value signal and the second view data of backlight illumination signal output the first view data of correspondence（Step
S510）.Wherein, the order of above-mentioned steps S502~S510 is to illustrate that the embodiment of the present invention is not limited.Also, it is above-mentioned
The details of step S502~S510 can refer to described in the embodiment of Fig. 1, Fig. 2A to Fig. 2 D and Fig. 4.
Fig. 6 shows a kind of flow chart of image processing method of another embodiment of the present invention.Wherein, during Fig. 6 can be considered Fig. 5
The detail flowchart of step S504.Fig. 6 is refer to, in the present embodiment, image processing method comprises the following steps.Judge electronics
Whether device is operated according to the electric power of battery（Step S602）.When electronic installation is operated according to the electric power of battery, that is, walk
Whether the judged result of rapid S602 is "Yes", then judge ambient light intensity less than the first critical value（Step S604）.Work as ambient light
When intensity is more than or equal to the first critical value, i.e., the judged result of step S604 is "No", then according to strength signal adjustment image letter
Number the first view data corresponding to image brightness values so that the second view data be different from the first view data（Step
S606）.When ambient light intensity is less than the first critical value, i.e., the judged result of step S604 is "Yes", then do not adjust image letter
Number the first view data corresponding to image brightness values so that the second view data is identical with the first view data（Step
S608）.
On the other hand, when electronic installation is operated according to external electric power, i.e. the judged result of step S602 is
Whether "No", then judge ambient light intensity less than the first critical value（Step S610）.When ambient light intensity is less than the first critical value
When, i.e., the judged result of step S610 is "Yes", then according to the first view data institute of graphical analysis signal deciding picture signal
Corresponding image brightness values（Step S612）.When ambient light intensity is more than or equal to the first critical value, i.e. the judgement of step S610
Whether result is "No", then judge ambient light intensity less than the second critical value（Step S614）.When ambient light intensity is more than or equal to
First critical value and during less than the second critical value, i.e., the judged result of step S614 is "Yes", then according to strength signal and image
Signal Analysis distinguish one of corresponding image gain value selection intensity signal and graphical analysis signal, and according to selection
Image brightness values corresponding to first view data of strength signal and graphical analysis signal deciding picture signal（Step S616）.
When ambient light intensity is more than or equal to the second critical value, i.e., the judged result of step S614 is "No", then determined according to strength signal
Determine the image brightness values corresponding to the first view data of picture signal（Step S618）.Wherein, above-mentioned steps S602~S618
Order be to illustrate, the embodiment of the present invention is not limited.Also, the details of above-mentioned steps S602~S618 can refer to figure
1st, described in the embodiment of Fig. 2A to Fig. 2 D and Fig. 4.
In sum, image processing circuit of the invention and its method can be according to the electric power operating mode of electronic installation and rings
The intensity of border light adaptively determines the image brightness values that picture signal is presented.On the other hand, image procossing electricity of the invention
Road and its method can be bright by the backlight for adjusting screen under different environment light sources according to the recognized difference of picture signal
Degree increases image quality with the color saturation of picture signal.Consequently, it is possible to image processing circuit of the invention and its method
Can solve the problems, such as that user does not see Chu's screen of electronic device display content under high light, and simultaneously lift on-screen displays
Quality.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
Modified with to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (13)
1. a kind of image processing circuit, it is characterised in that suitable for an electronic installation, including：
One optical sensor, is used to sense an ambient light intensity and one strength signal of output；
One image control unit, couples the optical sensor, and receives a picture signal, and the image control unit is believed according to the intensity
Number determine the image brightness values corresponding to one first view data of the picture signal；
One gamma curve look-up table, couples the image control unit, and is controlled by image control unit output to should image
One brightness value signal of brightness value；
One backlight control unit, couples the image control unit, and be controlled by image control unit output to should image it is bright
One backlight illumination signal of angle value；And
One graphics processing unit, couples the gamma curve look-up table and the backlight control unit, with according to the brightness value signal and
The backlight illumination signal output to should the first view data one second view data,
Wherein, when the ambient light intensity is operated more than or equal to the electric power of one first critical value and the electronic installation one battery of foundation
When, the image control unit determines that the image corresponding to first view data of the picture signal is bright according to the strength signal
Angle value, and second view data is different from first view data, when the ambient light intensity less than first critical value and
When the electronic installation is operated according to the electric power of the battery, the image control unit determines the picture signal according to the strength signal
The image brightness values corresponding to first view data, and second view data is identical with first view data, when
When the ambient light intensity is operated more than or equal to first critical value and the electronic installation according to the electric power of the battery, the image control
Unit improves the difference between multiple low-light level grey decision-makings.
2. image processing circuit according to claim 1, it is characterised in that also include：
One saturation degree look-up table, couples the image control unit, and be controlled by image control unit output to should image it is bright
One saturation signal of angle value,
Wherein, the graphics processing unit exports correspondence according to the brightness value signal, the backlight illumination signal and the saturation signal
Second view data of first view data.
3. image processing circuit according to claim 1, it is characterised in that also include：
One image analyzing unit, receives the picture signal, to analyze an image distribution of the picture signal, and accordingly provides one
Graphical analysis signal,
Wherein, the image control unit is according to the strength signal or first figure of the graphical analysis signal deciding picture signal
The image brightness values as corresponding to data.
4. image processing circuit according to claim 3, it is characterised in that when the ambient light intensity is critical less than one first
Value and when the electronic installation is operated according to an external electric power, the image control unit is according to the graphical analysis signal deciding image
The image brightness values corresponding to first view data of signal, when the ambient light intensity is more than or equal to first critical value,
When being operated according to the external electric power less than one second critical value and the electronic installation, the image control unit is according to the strength signal
And the graphical analysis signal distinguish corresponding image gain value select the strength signal and the graphical analysis signal wherein it
One, and corresponding to first view data of the strength signal according to selection and the graphical analysis signal deciding picture signal
The image brightness values, when the ambient light intensity is transported more than or equal to second critical value and the electronic installation according to the external electric power
When making, the image control unit determines the image corresponding to first view data of the picture signal according to the strength signal
Brightness value.
5. image processing circuit according to claim 4, it is characterised in that the image gain value is to be determined according to following formula：
(OGA/OGM)GAL=(OGA'/OGM)
Wherein, OGM is a maximum gray value, and OGA is any grey decision-making and is not equal to the maximum gray value, and OGA' is adjusted
Grey decision-making, GAL is the image gain value.
6. image processing circuit according to claim 4, it is characterised in that when the graphical analysis signal represents that the image is believed
During number for a high-brghtness picture images, the image control unit improves the difference between multiple high brightness grey decision-makings, when the image
Signal Analysis represent the picture signal in one during luminance picture, the image control unit improve multiple in intensity gray scale value each other
Between difference, when the graphical analysis signal represent the picture signal be a low-luminosity picture when, the image control unit improve
Difference between multiple low-light level grey decision-makings.
7. image processing circuit according to claim 3, it is characterised in that when the electronic installation is transported according to an external electric power
When making, the image control unit determines one first corresponding to first view data of the picture signal according to the strength signal
Brightness reference value, according to the graphical analysis signal deciding picture signal first view data corresponding to one second brightness
Reference value, and determine being somebody's turn to do corresponding to first view data according to first brightness reference value and second brightness reference value
Image brightness values, the wherein image brightness values are that first brightness reference value and second brightness reference value are multiplied by a weight respectively
Summation after value.
8. a kind of image processing method, it is characterised in that suitable for an electronic installation, the method comprises the following steps：
Sense an ambient light intensity and one strength signal of output；
Receive a picture signal and the figure corresponding to one first view data of the picture signal is determined according to the strength signal
Image brightness value；
Export to should image brightness values a brightness value signal；
Export to should image brightness values a backlight illumination signal；And
According to the brightness value signal and the backlight illumination signal output to should the first view data one second view data,
Wherein, the step of the image brightness values corresponding to first view data of the picture signal is determined according to the strength signal
Suddenly include：
When the ambient light intensity is operated more than or equal to the electric power of one first critical value and the electronic installation one battery of foundation, foundation
The strength signal determines the image brightness values corresponding to first view data of the picture signal, and second picture number
According to different from first view data；And
It is strong according to this when the ambient light intensity is less than first critical value and the electronic installation is operated according to the electric power of the battery
Spend the image brightness values corresponding to first view data of the signal deciding picture signal, and the second view data phase
It is same as first view data.
9. the image processing method according to claim 8, it is characterised in that also include：
Export to should image brightness values a saturation signal, and according to the brightness value signal, the backlight illumination signal and should
Saturation signal output to should the first view data second view data.
10. image processing method according to claim 8, it is characterised in that also include：
The picture signal is received, to analyze an image distribution of the picture signal, and a graphical analysis signal is accordingly provided；With
And
According to the strength signal or the graphical analysis signal deciding picture signal first view data corresponding to the figure
Image brightness value.
11. image processing methods according to claim 10, it is characterised in that according to the strength signal or the graphical analysis
The step of image brightness values corresponding to first view data of the signal deciding picture signal, includes：
When the ambient light intensity is less than one first critical value and electronic installation foundation one external electric power running, according to the image
Signal Analysis determine the image brightness values corresponding to first view data of the picture signal；
When the ambient light intensity is more than or equal to first critical value, less than one second critical value and the electronic installation is external according to this
When electric power is operated, distinguish corresponding image gain value according to the strength signal and the graphical analysis signal and select the strength signal
One of and the graphical analysis signal, and the strength signal and the graphical analysis signal deciding image letter according to selection
Number first view data corresponding to the image brightness values；And
When the ambient light intensity is more than or equal to second critical value and the electronic installation is operated according to the external electric power, foundation should
Strength signal determines the image brightness values corresponding to first view data of the picture signal.
12. image processing methods according to claim 11, it is characterised in that according to the graphical analysis signal deciding figure
The step of image brightness values as corresponding to first view data of signal, includes：
When it is a high-brghtness picture images that the graphical analysis signal represents the picture signal, improve multiple high brightness grey decision-makings each other it
Between difference；
When the graphical analysis signal represents the picture signal for luminance picture in, improve in multiple intensity gray scale value each other it
Between difference；And
When it is a low-luminosity picture that the graphical analysis signal represents the picture signal, improve multiple low-light level grey decision-makings each other it
Between difference.
13. image processing methods according to claim 10, it is characterised in that according to the strength signal or the graphical analysis
The step of image brightness values corresponding to first view data of the signal deciding picture signal, includes：
When the electronic installation is operated according to an external electric power, first image of the picture signal is determined according to the strength signal
One first brightness reference value corresponding to data, according to first picture number of this this graphical analysis signal deciding picture signal
According to one second corresponding brightness reference value, and according to first brightness reference value and second brightness reference value determine this
The image brightness values corresponding to one view data.
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