CN104810007A - Image processing circuit and method thereof - Google Patents

Abstract

An image processing circuit and method thereof. The image processing circuit includes a light sensor, an image control unit, a gamma curve lookup table, a backlight control unit, and an image processing unit. The light sensor senses the ambient light intensity and outputs an intensity signal. The image control unit receives the image signal and determines the image brightness value corresponding to the first image data of the image signal according to the intensity signal. The gamma curve lookup table outputs a brightness value signal corresponding to the image brightness value. The backlight control unit outputs a backlight brightness signal corresponding to the image brightness value. The image processing unit outputs second image data corresponding to the first image data according to the brightness value signal and the backlight brightness signal.

Description

Image processing circuit and method thereof

technical field

The present invention relates to a display technology, and in particular to an image processing circuit and its method.

Background technique

In order for the current electronic products to allow users to watch the images displayed on the screen under different ambient light sources, most electronic products are often equipped with a light sensor (Light Sensor) to sense changes in the ambient light sources around the electronic product. And adjust the backlight brightness of the screen. However, when the user's ambient light source is too strong (such as using electronic products outdoors), the specular reflection of the screen of the electronic product is stronger than the brightness of the image presented by the screen itself. Therefore, the user may only see the surrounding environment reflected by the screen, but cannot clearly see the picture displayed on the screen. Especially when the content of the picture to be displayed on the screen is relatively dark, the problem that the user cannot clearly see the picture will be even more serious. At present, the brightness of the backlight of the screen is increased to reduce the reflected light of the screen, but the above method consumes a lot of power and cannot make the picture clear. Therefore, how to prevent the display of images from being affected by ambient light has become a focus of display technology.

Contents of the invention

The invention provides an image processing circuit and its method, which can adaptively adjust the image brightness of the image signal according to the environmental light source to improve the image quality.

The image processing circuit of the present invention is applicable to electronic devices. The image processing circuit includes a light sensor, an image control unit, a gamma curve look-up table, a backlight control unit and an image processing unit. The light sensor is used for sensing ambient light intensity and outputting an intensity signal. The image control unit is coupled to the light sensor. The image control unit receives the image signal and determines the image brightness value corresponding to the first image data of the image signal according to the intensity signal. The gamma curve lookup table is coupled to the image control unit. The gamma curve lookup table is controlled by the image control unit to output a brightness value signal corresponding to the brightness value of the image. The backlight control unit is coupled to the image control unit. The backlight control unit is controlled by the image control unit to output a backlight brightness signal corresponding to the brightness value of the image. The image processing unit is coupled to the gamma curve look-up table and the backlight control unit. The image processing unit outputs second image data corresponding to the first image data according to the brightness value signal and the backlight brightness signal.

The image processing method of the present invention is suitable for electronic devices. The image processing method includes the following steps. The ambient light intensity is sensed and an intensity signal is output. The image signal is received and the image brightness value corresponding to the first image data of the image signal is determined according to the intensity signal. A brightness value signal corresponding to the brightness value of the image is output. Output a backlight brightness signal corresponding to the brightness value of the image. Outputting second image data corresponding to the first image data according to the brightness value signal and the backlight brightness signal.

Based on the above, the image processing circuit and method thereof of the present invention adaptively determine the image brightness value presented by the image signal according to the intensity of the ambient light source. In addition, the image processing circuit and method thereof of the present invention can increase the image quality displayed on the screen of the electronic device by adjusting the brightness of the backlight of the screen and the color saturation of the image signal. On the other hand, the image processing circuit and the method thereof of the present invention can determine the image brightness value of the image signal according to the different power operation conditions of the electronic device. In this way, the image processing circuit and the method thereof of the present invention can solve the problem that the user cannot clearly see the content displayed on the screen of the electronic device under strong light, and improve the quality of the screen displayed on the screen.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

FIG. 1 shows a schematic diagram of an image processing circuit according to an embodiment of the present invention;

2A to 2D respectively show a schematic diagram of adjusting the grayscale value of an image signal according to an embodiment of the present invention;

FIG. 3 shows a schematic diagram of brightness curves presented by an image signal under different ambient light sources according to an embodiment of the present invention;

FIG. 4 shows a schematic diagram of an image processing circuit according to another embodiment of the present invention;

FIG. 5 shows a flowchart of an image processing method according to an embodiment of the present invention;

Fig. 6 shows a flowchart of an image processing method according to another embodiment of the present invention.

Explanation of reference signs:

100, 400: image processing circuit;

102, 402: light sensor;

403: Saturation lookup table;

104, 404: image control unit;

105, 405: image analysis unit;

106, 406: gamma curve lookup table;

108, 408: backlight control unit;

110, 410: image processing unit;

BL, BL1: backlight brightness signal;

BR, BR1: brightness value signal;

IA: image analysis signal;

IM, IM1: image signal;

IN: Intensity signal;

ID1, ID11: first image data;

ID2, ID21: second image data;

SA: saturation signal;

S502～S510, S602～S618: steps;

30, 32, 201-203, 211-213, 200, 210, 220, 230: curves.

Detailed ways

FIG. 1 shows a schematic diagram of an image processing circuit according to an embodiment of the present invention. The image processing circuit 100 is applicable to electronic devices such as a Smart phone, a Personal Digital Assistant (PDA) mobile phone, or a Tablet PC. The image processing circuit 100 includes a light sensor 102 , an image control unit 104 , an image analysis unit 105 , a gamma curve lookup table 106 , a backlight control unit 108 and an image processing unit 110 .

The light sensor 102 is used to sense the intensity of ambient light sources around the electronic device and output an intensity signal IN correspondingly, such as a photo diode (Photo Diode), a photoelectric crystal or other electronic components with a light sensing function. When the user uses the electronic device outdoors, the ambient light source sensed by the light sensor 102 is relatively strong, that is, the light sensor 102 senses a high-intensity light source; when the user uses the electronic device indoors, the light sensor 102 senses The ambient light source is relatively weak, that is, the light sensor 102 senses a low-intensity light source. Therefore, the light sensor 102 will output different intensity signals IN corresponding to different ambient light intensity.

The image analysis unit 105 analyzes the image distribution of the image signal IM after receiving the image signal IM (for example, it can be received by the input terminal of the electronic device), and correspondingly provides the image analysis signal IA to the image control unit 104 . Wherein, the image analysis signal IA is, for example, an image grayscale histogram (Histogram) of the image signal IM or a grayscale average value of the image analysis signal IA.

The image control unit 104 is coupled to the light sensor 102 to receive the intensity signal IN, and coupled to the image analysis unit 105 to receive the image analysis signal IA. In this embodiment, the image control unit 104 will determine the image processing method of the first image data ID1 of the image signal IM according to the intensity signal IN, for example, the image control unit 104 will use the intensity signal IN and/or image analysis according to the intensity signal IN The signal IA determines the image brightness value corresponding to the first image data ID1 of the image signal IM.

When the image control unit 104 uses the intensity signal IN to determine the image brightness value corresponding to the first image data ID1 of the image signal IM, the image control unit 104 will determine the image brightness value of the image data according to the just noticeable difference (JND for short). , that is, the image control unit 104 will adjust the brightness value corresponding to each gray-scale value according to the ambient light intensity, so that multiple low-brightness gray-scale values can be clearly identified, wherein the adjusted gray-scale value is each image data (such as ID1 ) corresponding to the brightness value of the image. Assuming that the grayscale value ranges from 0 to 255, the above-mentioned low brightness grayscale value may be a grayscale value within the grayscale value of 32 plus or minus 4 grayscales.

When the image control unit 104 uses the image analysis signal IA to determine the image brightness value corresponding to the first image data ID1 of the image signal IM, the image control unit 104 will judge the image type transmitted by the image signal IM according to the image analysis signal IA to determine The processing method of the image signal IM. For example, when the image control unit 104 judges that the image signal IM is to transmit a high-brightness image, that is, most of the multiple image data of the image signal IM correspond to high-brightness grayscale values (such as grayscale values 171-255), the image control unit 104 will increase the brightness difference between the high-brightness gray scale values, so that the high-brightness image becomes clear; Most of them correspond to the grayscale values of medium brightness (such as grayscale values 86-170), the image control unit 104 will increase the brightness difference between the grayscale values of medium brightness; when the image control unit 104 judges that the image signal IM is to transmit a low brightness In the case of an image, that is, most of the multiple image data of the image signal IM correspond to middle-brightness grayscale values (such as grayscale values 0-85), the image control unit 104 will increase the brightness difference between low-brightness grayscale values.

Next, the image control unit 104 is coupled to the gamma curve lookup table 106 and the backlight control unit 108 to control the gamma curve lookup table 106 and the backlight control unit 108 to output the brightness value signal BR and the backlight respectively corresponding to the determined image brightness value. Brightness signal BL. The image processing unit 110 is coupled to the gamma curve look-up table 106 and the backlight control unit 108 , and outputs the second image data ID2 corresponding to the first image data ID1 according to the brightness value signal BR and the backlight brightness signal BL. Wherein, the image processing circuit 100 can adjust the brightness of the backlight module of the electronic device through the backlight brightness signal BL output by the backlight control unit 108, and can find the gamma curve corresponding to the image signal IM through the gamma curve lookup table 106. , so that the user can clearly see the content displayed on the screen of the electronic device under different ambient light sources.

In an embodiment of the present invention, the image processing circuit 100 can determine the processing mode of the image signal IM according to whether the electronic device has an external power supply, and determine the brightness adjustment method of the image signal IM according to the corresponding processing mode, so as to determine the adjustment of the image signal Image brightness value corresponding to IM. In other words, the image processing circuit 100 can first determine whether the electronic device is currently operating based on the battery power of the electronic device itself or based on external power, so as to further determine the processing mode of the image signal IM.

First, assume that the electronic device has no external power supply, that is, the electronic device operates on its own battery power, and the image processing circuit 100 is set to a DC power supply mode. Next, when the light sensor 102 detects that the ambient light intensity is greater than or equal to the first critical value (for example, 800 lux), it means that the user is using the electronic device outdoors or near a door or window, and the image control unit 104 will look up the table by controlling the gamma curve 106 Find a gamma curve corresponding to the current intensity signal IN, so that the adjusted image signal IM (that is, the image signal composed of a plurality of second image data ID2) has a recognizable difference, that is, the image control unit 104 will according to the intensity signal IN determines the image brightness value corresponding to the first image data ID1 of the image signal IM, so that the gray scale value (that is, the adjusted brightness value) corresponding to the second image data ID2 is different from the gray value corresponding to the first image data ID1 Step value (that is, the original brightness value).

FIG. 2A shows a schematic diagram of adjusting the grayscale value of an image signal according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2A. In this embodiment, it is assumed that the grayscale value ranges from 0 to 255, wherein the horizontal axis in FIG. 2A represents the input grayscale value corresponding to the image signal IM, and the vertical axis in FIG. 2A represents the adjusted grayscale value. The output grayscale value corresponding to the image signal IM. Curve 200 represents the unadjusted gamma curve (ie, the original gamma curve), and curves 210 , 220 and 230 represent the gamma curves corresponding to ambient light intensity of 3000lux, 5000lux and 8000lux respectively. Based on the above, as the intensity of the ambient light source becomes stronger, the image signal IM needs to be adjusted to a greater extent, so that low-brightness grayscale values (for example, within the range of grayscale value 32 plus or minus 4 grayscales) can be clearly identified .

When the light sensor 102 detects that the ambient light intensity is less than the first critical value, it means that the user is using the electronic device indoors, that is, the user does not have the interference of ambient light, so the image control unit 104 will not process the first image data ID1. The brightness value is adjusted, that is, the grayscale value corresponding to the second image data ID2 (ie, the adjusted brightness value) is the same as the grayscale value corresponding to the first image data ID1 (ie, the original brightness value). For example, when the user uses the electronic device indoors where the ambient light is not strong, the user will not be able to see the screen clearly due to the interference of the ambient light. Therefore, in other words, the image processing circuit 100 does not process the image signal IM, but directly outputs it. Moreover, in order to save the power consumption of the electronic device, the image processing circuit 100 can be set to a low power consumption mode (such as a shutdown state, a sleep mode).

On the other hand, suppose the electronic device receives the external power, that is, the electronic device operates according to the power of the external power, and the image processing circuit 100 is set to the AC power mode. Next, when the light sensor 102 detects that the ambient light intensity is less than the first critical value, it means that the user is using the electronic device indoors, that is, the user is not disturbed by the ambient light. The brightness value of the image data ID1 is adjusted, but the image brightness value corresponding to the first image data ID1 of the image signal IM is determined according to the image analysis signal IA, so as to improve the image quality.

Further, the image processing circuit 100 can know the image type transmitted by the image signal IM from the image analysis signal IA provided by the image analysis unit 105, and can process the first image data ID1 of the image signal IM according to the image type of the image signal IM. The corresponding image brightness value is adjusted. 2B to 2D respectively show a schematic diagram of adjusting the gray scale value of an image signal according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2B-2D, wherein the horizontal axis of FIG. 2B-2D represents the input grayscale value corresponding to the image signal IM, and the vertical axis of FIG. 2B-2D represents the output grayscale value corresponding to the adjusted image signal IM. value. In FIGS. 2B-2D , curves 201 , 202 , and 203 represent unadjusted gamma curves, and curves 211 , 212 , and 213 represent adjusted gamma curves.

When the image signal IM is a high-brightness image, the image control unit 104 will determine the brightness value corresponding to the first image data ID1 of the image signal IM according to the curve 211, so that the image control unit 104 will increase multiple high-brightness values of the image signal IM The brightness difference between the grayscale values (such as grayscale values 171~255) makes the contrast of the high-brightness part of the image more obvious, thereby increasing the details of the high-brightness grayscale; when the image signal IM is a medium-brightness image, The image control unit 104 will determine the luminance value corresponding to the first image data ID1 of the image signal IM according to the curve 212, so that the image control unit 104 will increase a plurality of middle-brightness grayscale values of the image signal IM (such as a grayscale value of 86- 170) The brightness difference between each other makes the contrast of the mid-brightness part of the image more obvious, thereby increasing the details of the mid-brightness grayscale; when the image signal IM is a low-brightness image, the image control unit 104 will determine according to the curve 213 The brightness value corresponding to the first image data ID1 of the image signal IM, so that the image control unit 104 will increase the difference between multiple low-brightness grayscale values (such as grayscale values 0-85), so that the low-brightness in the image Part of the contrast is more obvious, thereby increasing the details of low-brightness grayscale.

When the light sensor 102 detects that the ambient light intensity is greater than or equal to the first critical value and smaller than the second critical value (for example, 2000lux), it means that the user is using the electronic device near the door or window, that is, the current ambient light source is affected by the outdoor light source. It changes continuously due to the influence of the light source in the room. At this time, due to the use environment of the electronic device moving from indoor to outdoor, for the smoothness of image display, the image processing circuit 100 may simultaneously consider the ambient light source and the image type of the image signal IM to determine the image signal processing method. That is to say, the image control unit 104 can determine the brightness value corresponding to the first image data ID1 of the image signal IM according to the intensity signal IN (corresponding to the ambient light source) and the image analysis signal IA (corresponding to the image type of the image signal IM). . Next, calculate the image gain value GAL corresponding to the luminance value determined according to the intensity signal IN and the image analysis signal IA to select the luminance value determined according to the intensity signal IN or the luminance value determined according to the image analysis signal IA as the first value of the image signal IM Image brightness value corresponding to image data ID1. Wherein, the image control unit 104 may use the brightness value corresponding to the larger image gain value GAL as the image brightness value corresponding to the first image data ID1 of the image signal IM.

The determination method of the image gain value GAL will be described below, please refer to FIG. 3 . FIG. 3 shows a schematic diagram of brightness curves of an image signal under different ambient light sources according to an embodiment of the present invention. Please refer to Figure 3, the horizontal axis of Figure 3 represents the ambient light source (unit is lux), and the vertical axis of Figure 3 represents the brightness (unit is nit) corresponding to a specific grayscale value (such as grayscale value 32). Curve 30 represents the original brightness curve of a specific gray scale value (eg gray scale value 32), and curve 32 represents the adjusted brightness curve of the specific gray scale value (eg gray scale value 32). The relationship between curves 30 and 32 corresponds to the following formula:

(OGA/OGM)GAL=(OGA'/OGM)

Among them, OGM is the maximum grayscale value of the image signal IM (for example: grayscale value 255), OGA is any grayscale value of the image signal IM (such as low brightness grayscale value 32) and is not equal to the maximum grayscale value (such as 255 ), OGA' is the adjusted grayscale value of the image signal IM (eg curve 32 ).

On the other hand, when the light sensor 102 detects that the ambient light intensity is greater than or equal to the second critical value, it means that the user is using the electronic device outdoors, and the image control unit 104 will control the gamma curve lookup table 106 to find the corresponding current intensity signal The gamma curve of IN, so that the adjusted image signal IM (that is, the image signal composed of a plurality of second image data ID2) has a recognizable difference, that is, the image control unit 104 will determine the first image signal IM according to the intensity signal IN The image brightness value corresponding to an image data ID1, so that the grayscale value corresponding to the second image data ID2 (ie, the adjusted brightness value) is different from the grayscale value corresponding to the first image data ID1 (ie, the original brightness value) value).

It can be known from the above description that when the electronic device operates according to the external power, the image control unit 104 will determine the image of the image signal IM according to the magnitude relationship between the ambient light intensity sensed by the light sensor 102 and the first critical value and the second critical value. Brightness value. In another embodiment of the present invention, when the electronic device operates according to external power, the image control unit 104 may determine the image brightness value of the image signal IM regardless of the magnitude relationship between the ambient light intensity and the first critical value and the second critical value. In other words, the image control unit 104 can find the brightness value (corresponding to the first brightness reference value) corresponding to the first image data ID1 of the image signal IM according to the intensity signal IN, and the image control unit 104 will find the image signal IM according to the image analysis signal IA The luminance value corresponding to the first image data ID1 of the image signal IM (corresponding to the second luminance reference value), and then according to the first luminance reference value and the second luminance reference value to determine the final luminance value corresponding to the first image data ID1 of the image signal IM .

In this embodiment, the image control unit 104 can set the image brightness value of the image signal IM as the sum of the first brightness reference value and the second brightness reference value. In other embodiments, the image control unit 104 may set the image brightness value of the image signal IM as the sum of the first brightness reference value and the second brightness reference value multiplied by the weight value respectively. It should be noted that the weight setting of the first brightness reference value and the second brightness reference value can be adjusted according to actual needs.

Fig. 4 shows a schematic diagram of an image processing circuit according to another embodiment of the present invention. The image processing circuit 400 includes a light sensor 402 , a saturation lookup table 403 , an image control unit 404 , an image analysis unit 405 , a gamma curve lookup table 406 , a backlight control unit 408 and an image processing unit 410 . Wherein, for the working methods of the light sensing 402, the image control unit 404, the image analysis unit 405, the gamma curve lookup table 406, the backlight control unit 408 and the image processing unit 410, please refer to the light sensor 102, the image processing circuit 100 in FIG. The image control unit 104 , the image analysis unit 105 , the gamma curve lookup table 106 , the backlight control unit 108 and the image processing unit 110 will not be repeated here.

Comparing the image processing circuit 400 with the image processing circuit 100 , the image processing circuit 400 also includes a saturation lookup table 403 . The saturation lookup table 403 is coupled to the image control unit 404 and outputs a saturation signal SA corresponding to the brightness value of the image. The image processing unit 410 outputs the second image data ID21 corresponding to the first image data ID11 of the image signal IM1 according to the brightness value signal BR1 , the backlight brightness signal BL1 and the saturation signal SA. In this embodiment, the image processing unit 410 outputs the second image data ID21 according to the saturation signal SA, so as to set the saturation corresponding to the second image data ID21 according to the saturation signal SA.

Fig. 5 shows a flowchart of an image processing method according to an embodiment of the present invention. Please refer to FIG. 5 , in this embodiment, the image processing method includes the following steps. Sensing ambient light intensity and outputting an intensity signal (step S502 ). An image signal is received and an image brightness value corresponding to the first image data of the image signal is determined according to the intensity signal (step S504 ). Outputting a brightness value signal corresponding to the brightness value of the image (step S506 ). Outputting a backlight brightness signal corresponding to the brightness value of the image (step S508 ). Outputting second image data corresponding to the first image data according to the brightness value signal and the backlight brightness signal (step S510 ). Wherein, the above sequence of steps S502 to S510 is used to illustrate the embodiment of the present invention and is not limited thereto. Moreover, the details of the above steps S502-S510 can be referred to the embodiment in FIG. 1 , FIG. 2A-FIG. 2D and FIG. 4 .

Fig. 6 shows a flowchart of an image processing method according to another embodiment of the present invention. Wherein, FIG. 6 can be regarded as a detailed flowchart of step S504 in FIG. 5 . Referring to FIG. 6, in this embodiment, the image processing method includes the following steps. It is determined whether the electronic device operates according to the power of the battery (step S602 ). When the electronic device operates on the power of the battery, that is, the determination result of step S602 is “Yes”, it is determined whether the ambient light intensity is less than the first threshold (step S604 ). When the ambient light intensity is greater than or equal to the first critical value, that is, the judgment result of step S604 is "No", the image brightness value corresponding to the first image data of the image signal is adjusted according to the intensity signal, so that the second image data is different from The first image data (step S606). When the ambient light intensity is less than the first critical value, that is, the judgment result of step S604 is "Yes", the image brightness value corresponding to the first image data of the image signal is not adjusted so that the second image data is consistent with the first image data. Same (step S608).

On the other hand, when the electronic device operates according to the external power, that is, the determination result of step S602 is "No", it is determined whether the ambient light intensity is less than the first critical value (step S610 ). When the ambient light intensity is less than the first critical value, that is, the determination result of step S610 is "Yes", the image brightness value corresponding to the first image data of the image signal is determined according to the image analysis signal (step S612 ). When the ambient light intensity is greater than or equal to the first critical value, that is, the judgment result of step S610 is "No", it is judged whether the ambient light intensity is smaller than the second critical value (step S614 ). When the ambient light intensity is greater than or equal to the first critical value and less than the second critical value, that is, the judgment result of step S614 is "Yes", then the intensity signal and the image analysis signal are selected according to the image gain values corresponding to the intensity signal and the image analysis signal respectively. One of them, and determine the image brightness value corresponding to the first image data of the image signal according to the selected intensity signal and the image analysis signal (step S616 ). When the ambient light intensity is greater than or equal to the second critical value, that is, the determination result of step S614 is "No", the image brightness value corresponding to the first image data of the image signal is determined according to the intensity signal (step S618 ). Wherein, the above sequence of steps S602 to S618 is for illustration, and the embodiment of the present invention is not limited thereto. Moreover, the details of the above steps S602-S618 can be referred to the embodiment in FIG. 1 , FIG. 2A-FIG. 2D and FIG. 4 .

To sum up, the image processing circuit and method thereof of the present invention adaptively determine the image brightness value presented by the image signal according to the power operation mode of the electronic device and the intensity of ambient light. On the other hand, the image processing circuit and the method thereof of the present invention increase the image quality by adjusting the brightness of the backlight of the screen and the color saturation of the image signal under different ambient light sources according to the identifiable difference of the image signal. In this way, the image processing circuit and the method thereof of the present invention can solve the problem that the user cannot clearly see the content displayed on the screen of the electronic device under strong light, and improve the quality of the screen displayed on the screen.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (15)

1. an image processing circuit, is characterized in that, is applicable to an electronic installation, comprises:

One optical sensor, in order to sense an ambient light intensity and to export a strength signal;

One image control unit, couples this optical sensor, and receives a picture signal, and this image control unit determines the image brightness values corresponding to one first view data of this picture signal according to this strength signal;

One gamma curve look-up table, couples this image control unit, and is controlled by this image control unit and exports should a brightness value signal of image brightness values;

One backlight control unit, couples this image control unit, and is controlled by this image control unit and exports should a backlight illumination signal of image brightness values; And

One graphics processing unit, couples this gamma curve look-up table and this backlight control unit, to export should one second view data of the first view data according to this brightness value signal and this backlight illumination signal.

2. image processing circuit according to claim 1, is characterized in that, also comprises:

One saturation degree look-up table, couples this image control unit, and is controlled by this image control unit and exports should a saturation signal of image brightness values,

Wherein, this graphics processing unit exports should this second view data of the first view data according to this brightness value signal, this backlight illumination signal and this saturation signal.

3. image processing circuit according to claim 1, it is characterized in that, when this ambient light intensity is more than or equal to one first critical value and the electric power of this electronic installation foundation one battery operates, this image control unit determines this image brightness values corresponding to this first view data of this picture signal according to this strength signal, and this second view data is different from this first view data, when this ambient light intensity be less than this first critical value and this electronic installation according to this battery electric power running time, this image control unit determines this image brightness values corresponding to this first view data of this picture signal according to this strength signal, and this second view data is identical with this first view data, when this ambient light intensity be more than or equal to this first critical value and this electronic installation according to this battery electric power running time, this image control unit improves multiple low-light level grey decision-making difference each other.

4. image processing circuit according to claim 1, is characterized in that, also comprises:

One image analyzing unit, receives this picture signal, to analyze an image distribution of this picture signal, and provides a graphical analysis signal accordingly,

Wherein, this image control unit according to this strength signal or this this picture signal of graphical analysis signal deciding this first view data corresponding to this image brightness values.

5. image processing circuit according to claim 4, it is characterized in that, when this ambient light intensity is less than one first critical value and this electronic installation operates according to an external electric power, this image control unit according to this this picture signal of graphical analysis signal deciding this first view data corresponding to this image brightness values, when this ambient light intensity is more than or equal to this first critical value, be less than one second critical value and this electronic installation operates according to this external power time, this image control unit selects one of them of this strength signal and this graphical analysis signal according to the image gain value that this strength signal and this graphical analysis signal are corresponding respectively, and according to this strength signal of selection and this image brightness values corresponding to this first view data of this this picture signal of graphical analysis signal deciding, when this ambient light intensity is more than or equal to this second critical value and this electronic installation operates according to this external power, this image control unit determines this image brightness values corresponding to this first view data of this picture signal according to this strength signal.

6. image processing circuit according to claim 5, is characterized in that, this image gain value is determine 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 this maximum gray value, and OGA' is adjusted grey decision-making, and GAL is this image gain value.

7. image processing circuit according to claim 5, it is characterized in that, when this graphical analysis signal represents that this picture signal is a high-brghtness picture images, this image control unit improves multiple high brightness grey decision-making difference each other, when this graphical analysis signal represents that this picture signal is luminance picture in, this image control unit improves multiple middle intensity gray scale values difference each other, when this graphical analysis signal represents that this picture signal is a low-luminosity picture, this image control unit improves multiple low-light level grey decision-making difference each other.

8. image processing circuit according to claim 4, it is characterized in that, when this electronic installation is according to an external power running, this image control unit determines one first brightness reference value corresponding to this first view data of this picture signal according to this strength signal, according to this this picture signal of graphical analysis signal deciding this first view data corresponding to one second brightness reference value, and determine this image brightness values corresponding to this first view data according to this first brightness reference value and this second brightness reference value, wherein this image brightness values is the summation after this first brightness reference value and this second brightness reference value are multiplied by a weighted value respectively.

9. an image processing method, is characterized in that, be applicable to an electronic installation, the method comprises the following steps:

Sense an ambient light intensity and export a strength signal;

Receive a picture signal and determine the image brightness values corresponding to one first view data of this picture signal according to this strength signal;

Export should a brightness value signal of image brightness values;

Export should a backlight illumination signal of image brightness values; And

Export should one second view data of the first view data according to this brightness value signal and this backlight illumination signal.

10., according to the image processing method described in claim 9, it is characterized in that, also comprise:

Export should a saturation signal of image brightness values, and export should this second view data of the first view data according to this brightness value signal, this backlight illumination signal and this saturation signal.

11. image processing methods according to claim 9, is characterized in that, determine that the step of this image brightness values corresponding to this first view data of this picture signal comprises according to this strength signal:

When this ambient light intensity is more than or equal to one first critical value and the electric power of this electronic installation foundation one battery operates, determine this image brightness values corresponding to this first view data of this picture signal according to this strength signal, and this second view data is different from this first view data; And

When this ambient light intensity be less than this first critical value and this electronic installation according to this battery electric power running time, determine this image brightness values corresponding to this first view data of this picture signal according to this strength signal, and this second view data is same as this first view data.

12. image processing methods according to claim 9, is characterized in that, also comprise:

Receive this picture signal, to analyze an image distribution of this picture signal, and provide a graphical analysis signal accordingly; And

According to this strength signal or this this picture signal of graphical analysis signal deciding this first view data corresponding to this image brightness values.

13. image processing methods according to claim 12, is characterized in that, according to this strength signal or this this picture signal of graphical analysis signal deciding this first view data corresponding to the step of this image brightness values comprise:

When this ambient light intensity be less than one first critical value and this electronic installation according to one external electric power running time, according to this this picture signal of graphical analysis signal deciding this first view data corresponding to this image brightness values;

When this ambient light intensity is more than or equal to this first critical value, be less than one second critical value and this electronic installation operates according to this external power time, one of them of this strength signal and this graphical analysis signal is selected according to the image gain value that this strength signal and this graphical analysis signal are corresponding respectively, and according to this image brightness values corresponding to this first view data of this strength signal selected and this this picture signal of graphical analysis signal deciding; And

When this ambient light intensity is more than or equal to this second critical value and this electronic installation operates according to this external power, determine this image brightness values corresponding to this first view data of this picture signal according to this strength signal.

14. image processing methods according to claim 13, is characterized in that, according to this this picture signal of graphical analysis signal deciding this first view data corresponding to the step of this image brightness values comprise:

When this graphical analysis signal represents that this picture signal is a high-brghtness picture images, improve multiple high brightness grey decision-making difference each other;

When this graphical analysis signal represents that this picture signal is luminance picture in, improve multiple middle intensity gray scale values difference each other; And

When this graphical analysis signal represents that this picture signal is a low-luminosity picture, improve multiple low-light level grey decision-making difference each other.

15. image processing methods according to claim 12, is characterized in that, according to this strength signal or this this picture signal of graphical analysis signal deciding this first view data corresponding to the step of this image brightness values comprise:

When this electronic installation is according to an external power running, one first brightness reference value corresponding to this first view data of this picture signal is determined according to this strength signal, according to this this this picture signal of graphical analysis signal deciding this first view data corresponding to one second brightness reference value, and determine this image brightness values corresponding to this first view data according to this first brightness reference value and this second brightness reference value.