KR100734726B1 - Image sensor and method for controlling brightness of image - Google Patents

Abstract

An image sensor and an image brightness adjusting method are provided to stably adjust image brightness and improve clearness of an image by adding a weight value to pixel data according to exposure time information for generating a current picture on a screen. A pixel array(110) is divided into a plurality of areas according to brightness of an image to generate a pixel value from a pixel in the areas. An image brightness adjusting part(180) adds a weight value to the pixel value by pixels and adjusts the brightness of the image. And the weight value corresponds to exposure time information of the pixel value currently read from the pixel array. The image brightness adjusting part includes a weight value providing part(181) for adding the weight value to the pixel value by the pixels, storage media for storing pixel values including the weight value by the areas, area representative value generating parts(183a,183b) for generating brightness representative values by using the stored pixel values, and an image representative value generating part(184) for generating a brightness representative value of the image by using the representative values.

Description

Image sensor and image brightness adjustment {IMAGE SENSOR AND METHOD FOR CONTROLLING BRIGHTNESS OF IMAGE}

1 shows a subject with backlight;

2 shows a subject with excessive front light;

3 is a view illustrating a window method using two regions.

4 is a diagram illustrating a segment method using two or more regions.

5 is a configuration diagram illustrating a configuration of an image sensor to which the window method according to the prior art is applied.

FIG. 6 is a diagram illustrating the configuration of an image sensor according to a first embodiment of the present invention; FIG.

FIG. 7 is a conceptual diagram illustrating a pixel area to which weights shown in FIG. 6 are added. FIG.

FIG. 8 is a conceptual diagram illustrating the weight shown in FIG. 7; FIG.

9 is a view illustrating the configuration of an image sensor according to a second embodiment of the present invention.

FIG. 10 is a configuration diagram showing the configuration of an image sensor according to Embodiment 3 of the present invention; FIG.

FIG. 11 is a diagram illustrating the configuration of an image sensor according to a fourth embodiment of the present invention; FIG.

12 is a configuration diagram showing the configuration of an image sensor according to a fifth embodiment of the present invention;

13 is a flowchart illustrating a method for adjusting image brightness according to an embodiment of the present invention.

14 is a flowchart illustrating a method of adjusting image brightness according to another embodiment of the present invention.

15 is a view showing an image taken by applying the window method according to the prior art.

16 is a view showing an image captured by applying the window method according to the present invention.

<Description of the symbols for the main parts of the drawings>

10, 110: pixel array

20, 120: low decoder

30, 130: column decoder

40, 140: analog line buffer

50, 150: PGA

60, 160: ADC

70, 170: DSP

71, 171: color correction unit

72, 172: color interpolator

73, 173: color space conversion unit

80, 180, 280: brightness control

81a, 81b, 182a, 182b, 282a, 282b: line buffer

82a, 82b: average value generator

83a, 83b, 181, 281, 284a, 284b: weight providing unit

84, 183a, 183b, 184, 283a, 283b, and 285: representative value generator

The present invention relates to a semiconductor design technology, and relates to an image sensor and an image brightness adjustment method.

Recently, the demand of digital cameras is exploding with the development of video communication using the Internet. Moreover, the demand for small camera modules increases as the popularity of mobile communication terminals such as PDAs equipped with cameras, International Mobile Telecommunications-2000 (IMT-2000), Code Division Multiple Access (CDMA) terminals, etc. increases. Doing.

The camera module basically includes an image sensor. In general, an image sensor refers to a device that converts an optical image into an electrical signal. As such an image sensor, a charge coupled device (hereinafter referred to as a CCD) and a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor are widely used.

An image sensor is indispensable for automatic control of light exposure, which acts like the iris of a human eye, and requires more intelligent and more efficient brightness control under various circumstances.

In the image sensor, as shown in FIG. 3, in order to adjust the brightness more efficiently for an environment requiring special exposure control such as the backlight shown in FIG. 1 or the excessive front light shown in FIG. For example, a window method of dividing into a central portion A and its peripheral area B and weighting each area as necessary, or a segment more precisely than the window method as shown in FIG. 4. A segmentation scheme using the average brightness value of each segment by dividing is proposed.

5 is a block diagram of an image sensor illustrated to explain a window method according to the related art.

Referring to FIG. 5, an image sensor according to the related art includes a pixel array 10, a row decoder 20, a column decoder 30, and an analog line buffer. 40, a variable amplifier 50 such as a programmable gain amplifier (PGA), an analog digital converter (hereinafter referred to as an ADC), and a digital signal process (hereinafter referred to as a DSP). 70 and a brightness controller 80.

The pixel array 10 arranges N × M (N, M is a natural number) pixels so as to maximize the response to light, and detects information about an image coming from the outside and converts the signal into an electrical signal. The pixel array 10 is divided into a central portion A and a peripheral region B by a window method, and this division is controlled by a row address and a column address.

The row decoder 20 selects pixels for each row line of the pixels of the pixel array 10 according to a row address under the control of a timing controller (not shown).

The column decoder 30 selects pixel data read into the analog line buffer 40 for each column line according to the column address in response to the control of the timing controller.

The analog line buffer 40 receives and stores data of pixels selected for each row by the row decoder 20 and sequentially outputs each column line under the control of the column decoder 30. In addition, the analog line buffer 40 also performs a correlated double sampling function on the pixel data output from the pixel array 10.

The PGA 50 amplifies and outputs pixel data sequentially output from the analog line buffer 40 to a preset gain value.

The ADC 60 converts analog pixel data output from the PGA 50 into digital pixel data and outputs the digital pixel data.

The DSP 70 image-processes the digital pixel data output from the ADC 60. The DSP 70 includes a color correction unit 71, a color interpolation unit 72, and a color space conversion unit 73.

The color corrector 71 removes noise included in the digital pixel data output from the ADC 60.

The color interpolation unit 72 converts one-channel digital pixel data output from the color correction unit 71 into three-channel pixel data and outputs the three-channel pixel data. For example, three pixel data are generated in one pixel data.

The color space converter 73 converts the RGB pixel data output from the color interpolator 72 into YCbCr and outputs it.

The brightness controller 80 adjusts the brightness of Y output from the color space converter 73. The brightness controller 80 includes a storage medium 81a and 81b such as a line buffer, an average value generator 82a and 82b, a weight provider 83a and 83b, and a representative value generator 84. All.

The line buffers 81a and 81b store pixel data output from the color space converter 73, that is, Y data, in accordance with the areas A and B divided in a window manner. For example, the Y data of the A area is stored in the line buffer 81a, and the Y data of the B area is stored in the line buffer 81b.

The average value generators 82a and 82b calculate and store average values of Y data stored in the line buffers 81a and 81b, respectively. For example, the average value of the Y data stored in the line buffer 81a is generated in the average value generator 82a, and the average value of the Y data stored in the line buffer 81b is generated in the average value generator 82b.

The weight providing units 83a and 83b add weights to the average values generated from the average value generating units 82a and 82b. In this case, the weights are added with different values according to the average values of the regions A and B. For example, as shown in FIG. 1, in the case of a subject having backlight, a weight added to an average value of the area A is higher than a weight added to an average value of the area B, and an object having excessive front light shown in FIG. In this case, the weight added to the average value of the A region is lowered.

The representative value generating unit 84 generates the brightness representative value by dividing the average values of the weighted regions A and B by adding the average values to each other and dividing the sum of the weights added to the average values of the regions A and B.

As described above, the image brightness control method using the window method according to the prior art simply calculates the average brightness value of each window area (A, B), and then adds weights according to the window area, and from the value obtained by the weight addition You are creating a representative value.

However, this method does not take into account the position or brightness of the subject's screen, but only adds weights to the average brightness values of the randomly divided window areas. Therefore, it is impossible to finely adjust the brightness according to the position or the brightness of the subject's screen. May result. In some cases, it is necessary to vary the weight calculation, and thus there is a problem in that the exposure control cannot be completed in all cases.

Therefore, the present invention has been proposed to solve the above problems of the prior art, and an object thereof is to provide an image sensor capable of stably adjusting brightness.

In addition, another object of the present invention is to provide an image brightness adjusting method of an image sensor that can stably adjust image brightness even in all cases (position, brightness).

According to an aspect of the present invention, there is provided an apparatus including: a pixel array that is divided into a plurality of regions according to an image to generate pixel values from pixels in the region, and pixels that are currently read from the pixel array. It provides an image sensor including an image brightness control unit for adjusting the brightness of the image by adding a weight corresponding to the exposure time information of the value to the pixel value for each pixel.

In addition, according to another aspect of the present invention, a pixel is divided into a plurality of window regions according to an image, and the window region is further divided into a plurality of regions that are equally weighted. An image for adjusting the brightness of the image by adding a pixel array for generating a value and a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each of the plurality of regions to which the same weight is added; It provides an image sensor including a brightness controller.

In addition, the present invention according to another aspect for achieving the above object of the present invention, is divided into a plurality of window region according to the image, the window region from the pixel divided into a plurality of region to add the same weight again A brightness of the image is adjusted by adding a pixel array generating a pixel value and a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each of the plurality of regions to which the same weight is added. An image sensor including an image brightness controller is provided.

According to still another aspect of the present invention, there is provided a pixel array which is divided into a plurality of areas according to an image to generate pixel values from pixels in the area, and reads the pixel values. An analog line buffer, a variable amplifier for adjusting a gain of the pixel value output from the analog line buffer, an analog digital converter for outputting an analog pixel value output from the variable amplifier, as a digital signal, An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to the exposure time information of the pixel value currently read from the analog-to-digital converter to the pixel value for each pixel, and to the pixel value output from the image brightness controller. Providing an image sensor including a digital signal processor for processing a digital image The.

In addition, the present invention according to another aspect for achieving the above object of the present invention, is divided into a plurality of window region according to the image, the window region from the pixel divided into a plurality of region to add the same weight again A pixel array for generating pixel values, an analog line buffer for reading out the pixel values, a variable amplifier for adjusting the gain of the pixel values output from the analog line buffer, and an analog pixel output from the variable amplifier An analog-to-digital converter that outputs a value as a digital signal, and a weight corresponding to exposure time information of the pixel value currently read out from the analog-digital converter, by adding the same weight to the pixel value for each of the plurality of regions to which the same weight is applied An image brightness controller for adjusting brightness, and the image brightness controller With respect to the output pixel value provides an image sensor including a digital signal processor for processing the digital image.

According to still another aspect of the present invention, there is provided a pixel array which is divided into a plurality of areas according to an image to generate pixel values from pixels in the area, and reads the pixel values. Is an analog line buffer, a variable amplifier for adjusting a gain of the pixel value output from the analog line buffer, an analog to digital converter for outputting an analog pixel value output from the variable amplifier and a digital signal; A color correction unit for removing noise of the digital pixel values output from the converter, a color interpolation unit performing color interpolation on the pixel values output from the color correction unit, and exposure of pixel values currently read from the color interpolation unit. Brightness of the image is added by adding a weight corresponding to time information to the pixel value for each pixel. And the image brightness adjusting unit for adjusting a, and provides an image sensor including a color space conversion of converting the pixel values output from the image brightness adjusting portion as YCbCr.

In addition, the present invention according to another aspect for achieving the above object of the present invention, is divided into a plurality of window region according to the image, the window region from the pixel divided into a plurality of region to add the same weight again A pixel array for generating pixel values, an analog line buffer for reading out the pixel values, a variable amplifier for adjusting the gain of the pixel values output from the analog line buffer, and an analog pixel output from the variable amplifier An analog-to-digital converter for outputting the value as a digital signal, a color correction unit for removing noise of the digital pixel value output from the analog-to-digital converter, and a color interpolation for performing color interpolation on the pixel value output from the color correction unit. Corresponding to exposure time information of a pixel value currently read from the executive part and the color interpolation part. An image brightness controller configured to adjust the brightness of the image by adding the weighted value to the pixel value for each of the plurality of regions to which the same weight is added, and a color space conversion unit for converting the pixel value output from the image brightness controller into YCbCr. It provides an image sensor including a portion.

According to still another aspect of the present invention, there is provided a pixel array which is divided into a plurality of areas according to an image to generate pixel values from pixels in the area, and reads the pixel values. Is an analog line buffer, a variable amplifier for adjusting a gain of the pixel value output from the analog line buffer, an analog to digital converter for outputting an analog pixel value output from the variable amplifier and a digital signal; A color correction unit for removing noise of the digital pixel value output from the converter, a color interpolation unit performing color interpolation on the pixel value output from the color correction unit, and a pixel value output from the color interpolation unit as YCbCr. The exposure of the color space conversion unit to be converted and the pixel value currently read from the color space conversion unit. It provides an image sensor including an image brightness control unit for adjusting the brightness of the image by adding a weight corresponding to the liver information to the pixel value for each pixel.

In addition, the present invention according to another aspect for achieving the above object of the present invention, is divided into a plurality of window region according to the image, the window region from the pixel divided into a plurality of region to add the same weight again A pixel array for generating a pixel value, an analog line buffer for reading out the pixel value, a variable amplifier for adjusting the gain of the pixel value output from the analog line buffer, and an analog pixel output from the variable amplification unit An analog-to-digital converter for outputting the value as a digital signal, a color correction unit for removing noise of the digital pixel value output from the analog-to-digital converter, and a color interpolation for performing color interpolation on the pixel value output from the color correction unit. A color space for converting pixel values output from the interpolation section and the color interpolation section into YCbCr. An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to the exposure time information of the pixel value currently read from the color space converter to the pixel value for each of the plurality of regions to which the same weight is added. It provides an image sensor that includes.

According to another aspect of the present invention, there is provided an image sensor including a pixel array that is divided into a plurality of areas according to an image, and generates and outputs pixel values from pixels in the area. An image brightness adjusting method comprising: reading a pixel value from the pixel array, adding a weight corresponding to exposure time information of a pixel value currently read from the pixel array, to the pixel value for each pixel; Calculating the brightness representative value of each region using the weighted pixel value, and calculating the brightness representative value of the image using the brightness representative value of each region. Provide a method.

In addition, the present invention according to another aspect for achieving the above object of the present invention, is divided into a plurality of window regions according to the image, the window region from the pixels divided into a plurality of regions to add the same weight again An image brightness adjustment method of an image sensor including a pixel array generating and outputting pixel values, the method comprising: reading a pixel value from the pixel array and corresponding to exposure time information of a pixel value currently read from the pixel array; Adding a weight to the pixel value for each of the plurality of regions to which the same weight is added; calculating a representative brightness value for each window region by using the pixel value to which the weight is added; Calculating a brightness representative value of the image using the brightness representative value. It provides image brightness control method of the paper sensor.

The present invention adds the weight of brightness for each pixel according to exposure time information, calculates the brightness representative value for each area, and calculates the brightness representative value for the entire image using the calculated brightness representative value for each area. Allow exposure control to work efficiently.

On the other hand, the exposure time information described below is collectively including the exposure time information and the gain value (PGA or digital gain value). That is, the exposure time information includes exposure time information and a gain value. The reason is that in order to know the illumination condition to which the image sensor is currently exposed, information on gain value as well as exposure time information is required.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. In addition, parts denoted by the same reference numerals throughout the specification represent the same elements performing the same function.

Example 1

6 is a block diagram illustrating the configuration of an image sensor according to Embodiment 1 of the present invention.

Referring to FIG. 6, in the image sensor according to the first exemplary embodiment of the present invention, a brightness controller 180 is provided at a rear end of the ADC 160 to perform brightness adjustment on pixel data output from the ADC 160. .

The brightness controller 180 may include a weight providing unit 181 for adding a brightness weight to the pixel-specific data output from the ADC 160, and the area-specific (A, B) data output from the weight providing unit 181. Representative value generating unit 183a for generating brightness representative values for the respective areas (A, B) by using the data stored in the line buffers, that is, the storage media 182a and 182b and the line buffers 182a and 182b, respectively. 183b and a representative value generator 184 for generating a representative value of the overall image brightness by using the representative values for each region output from the respective region representative values generators 183a and 183b.

The weight provider 181 adds different weights for each pixel according to exposure time information for each pixel. One such example is shown in FIG. 7. As shown in FIG. 7, the pixels have different brightnesses because they have different exposure times, and in order to correspond thereto, weights are added differently for each pixel. An example of the weight is shown in FIG. 8. Meanwhile, as the information including the exposure time information and the gain value, when the exposure time is changed, the gain value also changes correspondingly. In this case, the exposure time depends on the environment.

The line buffers 182a and 182b store pixel data to which weights are added from the weight providing unit 181 as areas A and B, respectively. For example, pixel data to which the weight of the A region is added is stored in the line buffer 182a, and data of the B region is stored in the line buffer 182b.

The representative value generators 183a and 183b generate the representative values for each region by dividing the pixel data for each region (A, B) stored in the line buffers 182a and 182b by the weight added from the weight provider 181. do. That is, the representative value generator 183a generates the representative value of the region A by dividing pixel data of the region A stored in the line buffer 182a by the sum of the weights provided by the weight providing unit 181. 183b generates a representative value of the B region by dividing the pixel data of the B region stored in the line buffer 182b by the sum of the weights provided by the weight providing unit 181.

The representative value generator 184 generates a representative value of the entire image from the representative values output from the representative value generators 183a and 183b for each region. The representative value of the entire image thus generated is output to the DSP 170.

The representative value output from the representative value generator 184 is interpolated through the color interpolator 172 after the noise is removed through the color corrector 171, and converted into YCbCr data through the color space converter 173. Is converted.

As described above, the image sensor according to the first exemplary embodiment of the present invention adds a weight corresponding to the exposure time information to the pixel-specific data output from the ADC 160, and thus, from the color space converter 173. The brightness of the Y data that is finally transformed can be adjusted, where the Y data is obtained by conversion of weighted RGB data.

Example 2

9 is a block diagram illustrating the configuration of an image sensor according to a second embodiment of the present invention.

9, the image sensor according to the second embodiment of the present invention has the same configuration as that of the first embodiment, but the brightness controller 180 is not positioned behind the ADC 160, but rather the DSP 170. It is located in the rear end of the color corrector 171. Thus, by controlling the brightness by adding weight to the pixel data from which the unnecessary noise is removed by the color correction unit 171, the effect of the noise can be minimized as compared with the first embodiment.

Example 3

10 is a block diagram illustrating the configuration of an image sensor according to Embodiment 3 of the present invention.

Referring to FIG. 10, the image sensor according to the third exemplary embodiment has the same configuration as that of the second exemplary embodiment, but the brightness controller 180 is not positioned at the rear end of the color corrector 171, but the color beams are not. It is located at the rear end of the liver 172. This makes the brightness adjustment as fine as that.

Example 4

11 is a block diagram illustrating the configuration of an image sensor according to Embodiment 4 of the present invention.

Referring to FIG. 11, the image sensor according to the fourth embodiment of the present invention has the same configuration as that of the third embodiment, but the brightness controller 180 is not positioned at the rear end of the color interpolator 172, but the color space is a color space. It is located at the rear end of the converter 173. As a result, since the brightness is adjusted for the Y data rather than the RGB data, the brightness can be simplified.

Example 5

12 is a block diagram illustrating the configuration of an image sensor according to a fifth embodiment of the present invention.

12, the image sensor according to Embodiment 5 of the present invention has the same configuration as that of Embodiment 1. As shown in FIG. However, in the brightness controller 280, weight providing units 284a and 284b are further added. That is, the weight corresponding to the exposure time information is added to the pixel data for each pixel output from the ADC 160 for each pixel, and the weighted pixel data is added to the area buffers 282a and 282b for each region. Save each. Then, the representative values for the pixel data for each region stored in the line buffers 282a and 282b are respectively calculated through the representative value generators 283a and 283b, and then weighted again for each calculated representative value for each region. do. Except for the weight providing units 284a and 284b, the structure is the same as that of the first embodiment.

Meanwhile, the brightness controller 280 described in Embodiment 5 may be used instead of the brightness controller 180 of Embodiments 2 to 4.

Hereinafter, a method of adjusting image brightness of the image sensor will be described with reference to FIG. 13.

Referring to FIG. 13, first, an image (frame) is divided (S131). That is, the pixel array 110 is divided into window regions A and B. FIG. In this case, two or more divided regions may be provided.

Thereafter, pixel data of the divided window areas A and B is read out (S132).

Thereafter, a weight corresponding to the light exposure time information is added to each pixel data of each pixel of the window areas A and B (S133). As shown in FIG. 7, the pixels included in the five more finely divided pixel regions 0 to 4 are weighted with different code values. The range of each area can be increased or decreased according to the exposure time information for generating the current screen. Alternatively, it may be fixed within a certain range. The number of regions can be increased or reduced as needed. In each region, the corresponding pixel data is added to or subtracted from the current code value by the corresponding weight (code value) to add weight. In this case, the weight of each region may be simply added or subtracted by an offset value, or more complicatedly, may be multiplied or divided by a specific weight value for each region.

Thereafter, the brightness representative value for each window area is calculated (S134). That is, the representative value is calculated by using pixel data with weights for each window area.

Thereafter, the overall image brightness representative value is calculated using the representative value for each window region (S135).

14 is a flowchart illustrating a method of adjusting image brightness of another image sensor.

FIG. 14 is a step of adding a weight to the representative value of each region once again after calculating the brightness representative value of each region in the image brightness adjustment method of FIG. 13 and before calculating the image representative value using the representative value of each region ( S145) is further included. Other steps are the same as in FIG.

Hereinafter, the effects of the prior art and the present invention will be compared with reference to FIGS. 15 and 16.

FIG. 15 illustrates a conventional technique of simply calculating an average value of each window area (area divided into a center part and a peripheral area) and calculating a representative value by adding weights (center part: peripheral area = 4: 1 ratio) according to the window area. 16 is a diagram obtained through the present invention in which a weight is added to each pixel data (pixel value) according to exposure time information for generating a current screen.

It can be seen that the screen shown in FIG. 16 has better clarity than FIG. 15.

Although the technical spirit of the present invention has been described in detail in the preferred embodiments, it should be noted that the above-described embodiments are for the purpose of description and not of limitation. In addition, it will be understood by those skilled in the art that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, according to the present invention, the image brightness is stably adjusted by adding weight to each pixel data (pixel value) according to the exposure time information for generating the current screen, thereby stably adjusting the image brightness to improve the sharpness of the image quality. Can be improved.

Claims (34)

delete A pixel array divided into a plurality of areas according to brightness of an image to generate pixel values from pixels in the area; And An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each pixel, The image brightness adjusting unit, A weight providing unit to add a weight corresponding to the exposure time information of the currently read pixel value for each pixel; A storage medium for storing the pixel value added with the weight by the weight providing unit for each area; And An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; And An image representative value generator which generates the brightness representative value of the image by using the representative value for each region Image sensor comprising a. A pixel array divided into a plurality of areas according to brightness of an image to generate pixel values from pixels in the area; And An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each pixel, The image brightness adjusting unit, A first weight providing unit to add a weight corresponding to the exposure time information of the currently read pixel value for each pixel; A storage medium configured to store pixel values weighted by the first weight providing unit for each area; An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; A second weight providing unit to add a weight to the representative value for each region; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each region to which weight is added through the second weight providing unit; Image sensor comprising a. delete A pixel array configured to generate pixel values from pixels divided into a plurality of window areas according to brightness of the image, wherein the window areas are divided into a plurality of areas to which the same weight is added; And And an image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each of the plurality of regions to which the same weight is added. The image brightness adjusting unit, A weight providing unit for adding a weight corresponding to the exposure time information of the currently read pixel value to each of a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the weight providing unit for each window area; And A representative value generator for each window region for generating a brightness representative value using pixel values stored for each window region in the storage medium; And An image representative value generation unit generating a brightness representative value of the image by using the representative value for each window region. Image sensor comprising a. A pixel array configured to generate pixel values from pixels divided into a plurality of window areas according to brightness of the image, wherein the window areas are divided into a plurality of areas to which the same weight is added; And And an image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each of the plurality of regions to which the same weight is added. The image brightness adjusting unit, A first weight providing unit configured to add a weight corresponding to the exposure time information of the currently read pixel value for each of a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the first weight providing unit for each window area; An area representative value generator for generating brightness representative values for each window area by using pixel values stored for each window area in the storage medium; A second weight providing unit to add a weight to the representative value for each window area; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each window region to which the weight is added through the second weight providing unit; Image sensor comprising a. The method according to any one of claims 2, 3, 5 and 6, Wherein the weight is an offset value of a digital code value or a pixel value currently being read. A pixel array divided into a plurality of areas according to brightness of an image to generate pixel values from pixels in the area; An analog line buffer reading the pixel value; A variable amplifier configured to adjust a gain of the pixel value output from the analog line buffer; An analog-digital converter for outputting an analog pixel value output from the variable amplifier as a digital signal; An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to exposure time information of a pixel value currently read from the analog-to-digital converter to the pixel value for each pixel; And A digital signal processor that processes a digital image with respect to the pixel value output from the image brightness controller. Image sensor comprising a. The method of claim 8, The image brightness adjusting unit, A weight providing unit to add a weight corresponding to the exposure time information of the currently read pixel value for each pixel; A storage medium for storing the pixel value added with the weight by the weight providing unit for each area; And An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; And An image representative value generator which generates the brightness representative value of the image by using the representative value for each region Image sensor comprising a. The method of claim 8, The image brightness adjusting unit, A first weight providing unit to add a weight corresponding to the exposure time information of the currently read pixel value for each pixel; A storage medium configured to store pixel values weighted by the first weight providing unit for each area; An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; A second weight providing unit to add a weight to the representative value for each region; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each region to which weight is added through the second weight providing unit; Image sensor comprising a. A pixel array configured to generate pixel values from pixels divided into a plurality of window areas according to brightness of the image, wherein the window areas are divided into a plurality of areas to which the same weight is added; And An analog line buffer reading the pixel value; A variable amplifier configured to adjust a gain of the pixel value output from the analog line buffer; An analog-digital converter for outputting an analog pixel value output from the variable amplifier as a digital signal; An image brightness controller configured to adjust a brightness of the image by adding a weight corresponding to exposure time information of a pixel value currently read from the analog-to-digital converter to the pixel value for each of the plurality of regions to which the same weight is added; And A digital signal processor that processes a digital image with respect to the pixel value output from the image brightness controller. Image sensor comprising a. The method of claim 11, The image brightness adjusting unit, A weight providing unit for adding a weight corresponding to the exposure time information of the currently read pixel value to each of a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the weight providing unit for each window area; And A representative value generator for each window region for generating a brightness representative value using pixel values stored for each window region in the storage medium; And An image representative value generation unit generating a brightness representative value of the image by using the representative value for each window region. Image sensor comprising a. The method of claim 11, The image brightness adjusting unit, A first weight providing unit configured to add a weight corresponding to the exposure time information of the currently read pixel value for each of a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the first weight providing unit for each window area; An area representative value generator for generating brightness representative values for each window area by using pixel values stored for each window area in the storage medium; A second weight providing unit to add a weight to the representative value for each window area; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each window region to which the weight is added through the second weight providing unit; Image sensor comprising a. The method according to claim 12 or 13, The digital signal processing unit, A color corrector which removes noise from pixel values output from the image brightness controller; A color interpolation unit which performs color interpolation on the pixel value output from the color correction unit; And A color space converter for converting pixel values output from the color interpolator into YCbCr. Image sensor comprising a. The method of claim 14, Wherein the weight is an offset value of a digital code value or a pixel value currently being read. A pixel array divided into a plurality of areas according to brightness of an image to generate pixel values from pixels in the area; An analog line buffer reading the pixel value; A variable amplifier configured to adjust a gain of the pixel value output from the analog line buffer; An analog-digital converter for outputting an analog pixel value output from the variable amplifier as a digital signal; A color correction unit for removing noise of a digital pixel value output from the analog to digital converter; A color interpolation unit which performs color interpolation on the pixel value output from the color correction unit; An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to exposure time information of a pixel value currently read from the color interpolator to the pixel value for each pixel; And A color space converter for converting the pixel value output from the image brightness controller into YCbCr Image sensor comprising a. The method of claim 16, The image brightness adjusting unit, A weight providing unit for adding a weight corresponding to the exposure time information of the pixel value currently read from the color interpolation unit for each pixel; A storage medium for storing the pixel value added with the weight by the weight providing unit for each area; And An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; And An image representative value generator which generates the brightness representative value of the image by using the representative value for each region Image sensor comprising a. The method of claim 16, The image brightness adjusting unit, A first weight providing unit for adding a weight corresponding to the exposure time information of the pixel value currently read from the color interpolation unit for each pixel; A storage medium configured to store pixel values weighted by the first weight providing unit for each area; An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; A second weight providing unit to add a weight to the representative value for each region; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each region to which weight is added through the second weight providing unit; Image sensor comprising a. A pixel array configured to generate pixel values from pixels divided into a plurality of window areas according to brightness of the image, wherein the window areas are divided into a plurality of areas to which the same weight is added; And An analog line buffer reading the pixel value; A variable amplifier configured to adjust a gain of the pixel value output from the analog line buffer; An analog-digital converter for outputting an analog pixel value output from the variable amplifier as a digital signal; A color correction unit for removing noise of a digital pixel value output from the analog to digital converter; A color interpolation unit which performs color interpolation on the pixel value output from the color correction unit; An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to the exposure time information of the pixel value currently read from the color interpolator to the pixel value for each of the plurality of regions to which the same weight is added; And A color space converter for converting the pixel value output from the image brightness controller into YCbCr Image sensor comprising a. The method of claim 19, The image brightness adjusting unit, A weight providing unit for adding a weight corresponding to the exposure time information of the pixel value currently read from the color interpolation unit for each of a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the weight providing unit for each window area; And A representative value generator for each window region for generating a brightness representative value using pixel values stored for each window region in the storage medium; And An image representative value generation unit generating a brightness representative value of the image by using the representative value for each window region. Image sensor comprising a. The method of claim 19, The image brightness adjusting unit, A first weight providing unit that adds a weight corresponding to exposure time information of a pixel value currently read from the color interpolation unit for each of a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the first weight providing unit for each window area; An area representative value generator for generating brightness representative values for each window area by using pixel values stored for each window area in the storage medium; A second weight providing unit to add a weight to the representative value for each window area; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each window region to which the weight is added through the second weight providing unit; Image sensor comprising a. The method according to any one of claims 16 to 21, Wherein the weight is an offset value of a digital code value or a pixel value currently being read. A pixel array divided into a plurality of areas according to brightness of an image to generate pixel values from pixels in the area; An analog line buffer reading the pixel value; A variable amplifier configured to adjust a gain of the pixel value output from the analog line buffer; An analog-digital converter for outputting an analog pixel value output from the variable amplifier as a digital signal; A color correction unit for removing noise of a digital pixel value output from the analog to digital converter; A color interpolation unit which performs color interpolation on the pixel value output from the color correction unit; A color space converting unit converting the pixel value output from the color interpolation unit into YCbCr; And An image brightness controller to adjust the brightness of the image by adding a weight corresponding to the exposure time information of the pixel value currently read from the color space converter to the pixel value for each pixel Image sensor comprising a. The method of claim 23, The image brightness adjusting unit, A weight providing unit for adding a weight corresponding to the exposure time information of the pixel value currently read from the color space conversion unit for each pixel; A storage medium for storing the pixel value added with the weight by the weight providing unit for each area; And An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; And An image representative value generator which generates the brightness representative value of the image by using the representative value for each region Image sensor comprising a. The method of claim 23, The image brightness adjusting unit, A first weight providing unit for adding a weight corresponding to the exposure time information of the pixel value currently read from the color space conversion unit for each pixel; A storage medium configured to store pixel values weighted by the first weight providing unit for each area; An area representative value generator for generating brightness representative values using pixel values stored in each area in the storage medium; A second weight providing unit to add a weight to the representative value for each region; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each region to which weight is added through the second weight providing unit; Image sensor comprising a. A pixel array configured to generate pixel values from pixels divided into a plurality of window areas according to brightness of the image, wherein the window areas are divided into a plurality of areas to which the same weight is added; And An analog line buffer reading the pixel value; A variable amplifier configured to adjust a gain of the pixel value output from the analog line buffer; An analog-digital converter for outputting an analog pixel value output from the variable amplifier as a digital signal; A color correction unit for removing noise of a digital pixel value output from the analog to digital converter; A color interpolation unit which performs color interpolation on the pixel value output from the color correction unit; A color space converting unit converting the pixel value output from the color interpolation unit into YCbCr; And An image brightness controller configured to adjust the brightness of the image by adding a weight corresponding to the exposure time information of the pixel value currently read from the color space converter to the pixel value for each of the plurality of regions to which the same weight is added; Image sensor comprising a. The method of claim 26, The image brightness adjusting unit, A weight providing unit for adding a weight corresponding to the exposure time information of the pixel value currently read from the color space conversion unit for each of a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the weight providing unit for each window area; And A representative value generator for each window region for generating a brightness representative value using pixel values stored for each window region in the storage medium; And An image representative value generation unit generating a brightness representative value of the image by using the representative value for each window region. Image sensor comprising a. The method of claim 27, The image brightness adjusting unit, A first weight providing unit configured to add a weight corresponding to exposure time information of a pixel value currently read out from the color space conversion unit by a plurality of regions to which the same weight is added; A storage medium configured to store pixel values weighted by the first weight providing unit for each window area; An area representative value generator for generating brightness representative values for each window area by using pixel values stored for each window area in the storage medium; A second weight providing unit to add a weight to the representative value for each window area; And An image representative value generating unit generating a brightness representative value of the image by using the representative value for each window region to which the weight is added through the second weight providing unit; Image sensor comprising a. The method according to any one of claims 23 to 28, Wherein the weight is an offset value of a digital code value or a pixel value currently being read. delete In the image brightness adjustment method of the image sensor comprising a pixel array divided into a plurality of areas according to the brightness of the image to generate and output a pixel value from the pixels of the area, Reading pixel values from the pixel array; Adding a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each pixel; Calculating a brightness representative value of each area by using the pixel value to which the weight is added; And Adding weights to the brightness representative values for each area; And Calculating a brightness representative value of the image using the brightness representative value of each region; Image brightness adjustment method of the image sensor comprising a. delete A method of controlling an image brightness of an image sensor including a pixel array which is divided into a plurality of window areas according to the brightness of an image, and the window area generates and outputs pixel values from pixels divided into a plurality of areas to which the same weight is added. To Reading pixel values from the pixel array; Adding a weight corresponding to exposure time information of a pixel value currently read from the pixel array to the pixel value for each of a plurality of regions to which the same weight is added; Calculating a brightness representative value for each window area by using the pixel value to which the weight is added; Adding weights to the brightness representative values for each window area; And Calculating a brightness representative value of the image using the brightness representative value of each window region; Image brightness adjustment method of the image sensor comprising a. The method of claim 31 or 33, And the weighting value is an offset value of a digital code value or a currently read pixel value.

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