WO2015178534A1 - Appareil d'amélioration de la qualité d'image, appareil de photographie numérique muni de celui-ci, et procédé d'amélioration de la qualité d'image - Google Patents

Appareil d'amélioration de la qualité d'image, appareil de photographie numérique muni de celui-ci, et procédé d'amélioration de la qualité d'image Download PDF

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Publication number
WO2015178534A1
WO2015178534A1 PCT/KR2014/006631 KR2014006631W WO2015178534A1 WO 2015178534 A1 WO2015178534 A1 WO 2015178534A1 KR 2014006631 W KR2014006631 W KR 2014006631W WO 2015178534 A1 WO2015178534 A1 WO 2015178534A1
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Prior art keywords
image
light
area
image sensor
zrf
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PCT/KR2014/006631
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English (en)
Korean (ko)
Inventor
최학림
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(주)엠시스
최학림
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Publication of WO2015178534A1 publication Critical patent/WO2015178534A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation

Definitions

  • the present invention relates to an image quality improving apparatus, a digital photographing apparatus having the same, and a method for improving image quality, and more particularly, an image having excellent sharpness and color reproducibility even when there is an excessive brightness difference due to light saturation or lack of light in each region within a screen.
  • the present invention relates to a device for improving image quality, a digital photographing device having the same, and a method for improving image quality.
  • a digital camera projects an image onto an image sensor, which is a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), not a film, and captures a photo on a digital storage medium such as a memory card. Record it.
  • CCD Charge Coupled Device
  • CMOS Complementary Metal Oxide Semiconductor
  • Such a digital camera provides an auto white balance (AWB) function to the entire screen when there is a light saturation due to excessive brightness of light or vice versa due to excessive brightness of the light on the image sensor. We are trying to improve it. At this time, the saturation or lack of light in each area causes problems in the sharpness and color reproduction of the screen.
  • AOB auto white balance
  • the digital camera when a difference occurs between the visible light region and the sensor sensitivity region, the digital camera operates as a noise of light outside the actual visible region in one entire screen.
  • the band By adjusting the band appropriately to adjust the brightness of the light to increase the sharpness of the screen, and to distribute the color to take a picture or record a video.
  • the present invention is a ZRF (Zone collected Reduction Filter) installed between the lens unit and the image sensor when there is an excessive brightness difference due to light saturation or lack of light in each area in one screen
  • ZRF Zero collected Reduction Filter
  • Zone collected Reduction Filter having an LCD (Liquid Crystal Display) in which light transmittance is adjusted for each area divided into a plurality of regions by driving an active array and driving a unit cell;
  • An image processor which processes an image acquired by the image sensor as data;
  • a ZRF controller configured to calculate brightness of a plurality of divided regions of the image from the data processed by the image processor, and to control light transmittance of the region of the LCD to reduce the brightness difference between the regions in the image.
  • the ZRF may be installed to be biased toward the image sensor between the IR cut filter installed between the lens unit and the image sensor and the image sensor.
  • the ZRF includes glass attached to both sides of the LCD, and first and second polarizing plates for polarizing light in a direction orthogonal to each other on the exposed surfaces of the glass, respectively, and are normally white.
  • the ZRF controller is configured to minimize the control of the light transmittance of the area of the LCD when the brightness difference of a plurality of areas divided in the image from the data processed by the image processor is within a normal range, It is possible to avoid performing control of the transmittance.
  • the LCD may have an area corresponding to a plurality of pixels as one unit in the image sensor.
  • polarization regions may be uniformly or unevenly discontinuously formed in one direction, and a plurality of discontinuous arrangements of the polarization regions may be formed side by side.
  • the first and second polarizers may be formed of a wire grid polarizer.
  • the first and second polarizing plates are formed on the substrate of the light transmissive material so that the uneven parts made of a light-transmissive dielectric material or polymer are patterned in the uneven shape in one direction and side by side, and are inclined in the same direction for each inside of the grooves of the uneven parts.
  • White metal can be deposited.
  • the lens unit is incident light; An image sensor installed at the rear of the lens unit; A main control unit controlling the image acquired by the image sensor to be stored in a memory unit; And an image quality improvement unit installed to control the light transmittance irradiated to the image sensor so as to reduce the brightness difference between the regions in the image acquired by the image sensor.
  • the image quality improvement unit may further improve image quality according to an aspect of the present invention.
  • a digital photographing apparatus which is an apparatus, is provided.
  • the digital photographing apparatus may be any one of a portable digital camera, a CCTV camera, a camera of a portable electronic device, a web camera, a camera module of a vision inspector, and a camera module of a black box.
  • ZRF Zone collected Reduction Filter
  • the adjusting of the light transmittance may include extracting a light defective area as an area deviating from a predetermined brightness difference from the overall brightness among the areas of the image, and correcting it as an area contributing to the formation of the light defective area from the area of the image sensor.
  • An area may be extracted, and an area for transmitting light irradiated to the correction area among the areas of the LCD may be extracted as an adjustment area, and the light transmittance of the adjustment area may be adjusted in inverse proportion to the brightness of the light defective area.
  • the image quality improving apparatus when there is an excessive brightness difference due to light saturation or light deficiency for each region in one screen, a ZRF ( By adjusting the light transmittance for each part by Zone collected Reduction Filter, it is possible to obtain an image with excellent clarity and color reproducibility, and to reduce the resolution reduction effect of the digital photographing apparatus according to the screen brightness difference.
  • a ZRF By adjusting the light transmittance for each part by Zone collected Reduction Filter, it is possible to obtain an image with excellent clarity and color reproducibility, and to reduce the resolution reduction effect of the digital photographing apparatus according to the screen brightness difference.
  • FIG. 1 is a block diagram showing a digital photographing apparatus according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating ZRF in a digital photographing apparatus according to an embodiment of the present invention.
  • FIG. 4 is a plan view illustrating a second polarizing plate in a digital photographing apparatus according to an embodiment of the present invention.
  • FIG. 5 is a plan view illustrating another example of the first flat plate in the digital photographing apparatus according to the exemplary embodiment.
  • FIG. 6 is a plan view illustrating another example of the second flat plate in the digital photographing apparatus according to the exemplary embodiment of the present invention.
  • FIGS. 5 and 6 are cross-sectional views of FIGS. 5 and 6.
  • FIG 8 and 9 are conceptual views for explaining the operation of the image quality improving apparatus according to an embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a method of improving image quality according to an embodiment of the present invention.
  • FIG. 1 is a block diagram showing a digital photographing apparatus according to an embodiment of the present invention.
  • the lens unit 210 collects light to form an image on the image sensor 120.
  • the lens unit 210 may include a single lens or a plurality of lenses.
  • the image sensor 220 is installed at the rear of the lens unit 210 and may be formed of a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), and an image focused on a chip surface is charged on an individual element. Accumulated in packets, these packets are output and converted into video for display. Meanwhile, an IR cut filter 230 may be installed at the front of the image sensor 220 to be positioned behind the lens unit 210.
  • the IR cut filter 230 is a filter for blocking the infrared rays to improve the color sensor because the image sensor recognizes not only visible light but also infrared light, and reacts with light.
  • the main controller 240 controls the image acquired by the image sensor 220 to be stored as data in the memory unit 250 according to an operation signal or a predetermined process by the operation unit, and outputs the data to the outside through the display unit as necessary. Can be controlled.
  • the image quality improvement unit is installed to control the light transmittance irradiated to the image sensor 220 to reduce the brightness difference between the regions in the image obtained by the image sensor 220, which is an image quality improving apparatus according to an embodiment of the present invention ( 100). Therefore, the image quality improvement unit will be described instead with the image quality improvement apparatus 100 according to an embodiment of the present invention.
  • the image quality improving apparatus 100 may include a zone collected reduction filter (ZRF), an image processor 120, and a ZRF controller 130.
  • ZRF zone collected reduction filter
  • the ZRF 110 is installed between the lens unit 210 and the image sensor 220, transmits the light passing through the lens unit 210 to the image sensor 220, and is configured in a pixel manner.
  • an LCD (Liquid Crystal Display) 111 (shown in FIG. 2) has an active array and an optical transmittance is adjusted for each area divided into a plurality of regions by unit cell driving.
  • the LCD 111 is composed of a plurality of pixels whose transmittance is adjusted.
  • the active array is controlled by the ZRF control unit 130, and may be a power supply circuit for supplying the power required for driving to each of the unit cells consisting of a single or multiple pixels, the size of the voltage for each of the unit cells, The application time is adjusted. Therefore, the LCD 111 may adjust the light transmittance of the pixel by the magnitude of the voltage applied by the ZRF controller 130, the application time of the voltage, and the like.
  • a region may be one unit in which light transmittance is adjusted by the ZRF controller 130, may be formed of one or a plurality of pixels, and a partition may be set by the ZRF controller 130.
  • the ZRF 110 moves toward the image sensor 220 between the IR cut filter 230 and the image sensor 220. Can be installed to strike.
  • each area of the LCD 111 may be configured to correspond to a plurality of pixels in the image sensor 220, which is just one example and may be configured to correspond to a single pixel in the image sensor 220.
  • each of the first and second flat plate plates 114 and 115 may be polarized in the X-axis and Y-axis directions, for example, but is not limited thereto. For example, it may have a polarization degree of 0.8 ⁇ 0.96.
  • the first and second polarizing plates 114 and 115 may be, for example, discontinuously formed in the polarization regions 114a and 115a, that is, regions in which light is polarized, in an equal width or length in one direction, and the polarization regions 114a and 115a. Discontinuous arrays of can be formed in plural alongside.
  • the first and second polarizing plates 114 and 115 may have uneven width or length in one direction, as well as a single polarization area as a whole.
  • the patterning of the uneven parts 116a and 117a may be formed using a unit process for manufacturing a semiconductor, such as a photo process or an etching process.
  • a plurality of rows of concave-convex shapes consisting of grooves and protrusions corresponding to the concave-convex portions 116a and 117a are formed in plural to correspond to the concave-convex portions 116a and 117a as in this embodiment, or as another example. It may be formed in a single side to be formed side by side so that a plurality of uneven parts 116a, 117a in the width direction.
  • the image processor 120 may process the image acquired by the image sensor 220 as data for calculating brightness for each of a plurality of divided regions, and output the data to the ZRF controller 130.
  • the ZRF controller 130 calculates the brightness of a plurality of divided regions of the image from the data processed by the image processor 120, and adjusts the light transmittance of the region of the LCD 111 to reduce the brightness difference between the regions in the image. To control.
  • the ZRF 110 is configured to be normally white, so that when no voltage is applied, light may be transmitted to have maximum luminance.
  • the ZRF controller 130 may be configured such that the brightness difference of the area divided into a plurality of regions by arbitrary setting from the data processed by the image processor 120 may be reduced to a normal range, for example, deterioration in image quality.
  • the control of the light transmittance of the area of the LCD 111 may be minimized, or the control of the light transmittance may not be performed.
  • the minimum step may refer to a step of minimizing the change in the light transmittance when the light transmittance of the area of the LCD 111 is set to a plurality of steps. In this case, the brightness difference between the areas in the image may be generated. The area of the LCD 111 corresponding to the area may be performed.
  • the ZRF controller 130 extracts a light defective area from a region of an image acquired by the image sensor 220 and deviates from a predetermined brightness difference compared to the overall brightness.
  • the correction region is extracted as a region contributing to the formation of the light
  • the region which transmits the light irradiated to the correction region is extracted as the adjustment region
  • the light transmittance of the adjustment region is inversely proportional to the brightness of the light defective region.
  • the overall brightness is the brightness of the whole image by the grade or numerical value
  • the brightness degree of each image area is determined by the grade or the numerical value and averaged, or other methods of calculating and determining the brightness difference.
  • the predetermined brightness difference may mean that an allowable range of the brightness difference between some or all areas and any one area is represented by a grade or a numerical value.
  • the ZRF controller 130 may include light corresponding to light saturation in an area of an image acquired by the image sensor 220, for example, an area that is excessively brighter than the overall brightness due to a subject emitting strong light. Defect area is extracted, and the correction area 222 is extracted as an area contributing to the formation of the light defective area from the areas 221 and 222 of the image sensor 220, and the correction area is selected from the areas 111a and 111b of the LCD 111. An area through which light irradiated at 222 is transmitted may be extracted as the adjustment area 111b, and the light transmittance of the adjustment area 111b may be adjusted to be lowered at a ratio set according to the brightness of the light defective area.
  • the light defective area, the correction area 222, and the adjustment area 111b may be composed of a single area or a plurality of areas among the areas partitioned by the setting in the corresponding object.
  • the ZRF controller 130 may have a light deficiency corresponding to a light shortage as an area that is excessively dark compared to the overall brightness due to a dark subject caused by backlight, for example, in an area of an image acquired by the image sensor 220.
  • the region is extracted, and the correction region 222 is extracted as an area contributing to the formation of the light defective region among the regions 221 and 222 of the image sensor 220, and the correction region (from the regions 111a and 111b of the LCD 111).
  • the area for transmitting the light irradiated to 222 may be extracted as the adjustment area 111b, and the light transmittance of the adjustment area 111b may be adjusted to be set at a ratio set according to the brightness of the light defective area.
  • the image quality improving method according to an embodiment of the present invention is a method using the image quality improving apparatus 100 according to an embodiment of the present invention, and the ZRF 110 and the image processing unit 120 of the image quality improving apparatus 100 described above. Since the configuration of the ZRF control unit 130 and the like and the embodiments thereof are applied in the same manner, a description of these configurations will be omitted.
  • an image is acquired from an image sensor 220 in which light is irradiated through the lens unit 210 and a zone collected reduction filter (ZRF) 110. (S11). Then, the image acquired by the image sensor 220 is processed by the image processor 120 as data (S12).
  • the ZRF controller 130 calculates the brightness of a plurality of divided regions of the image from the data processed by the image processor 120 (S13). When the CFR controller 130 calculates the brightness for each region of the image, the CFR controller 130 controls the light transmittance for a plurality of regions divided by the LCD 111 of the ZRF 110 to reduce the brightness difference between the regions in the image (S14).
  • step S14 the light transmittance is adjusted by the ZRF controller 130 to extract a light defective area from the area of the image acquired by the image sensor 220 as an area deviating from a predetermined brightness difference compared to the overall brightness.
  • the correction region is extracted from the region of the sensor 220 as a region contributing to the formation of the light defective region, and the region transmitting the light irradiated to the correction region from the region of the LCD 111 is extracted as the adjusting region.
  • the light transmittance can be adjusted in inverse proportion to the brightness of the light defective area. A detailed description thereof has been given above with reference to FIGS. 8 and 9.
  • the image can be obtained again by the image sensor 220, before the light transmittance is corrected by the LCD 111 in advance, even in situations such as light saturation or light shortage At the same time, it is possible to obtain images with excellent color reproduction.
  • the digital photographing apparatus having the same, and the image quality improving method according to the present invention, if there is an excessive brightness difference due to light saturation or light deficiency for each region in one screen, it is installed between the camera lens and the image sensor.
  • ZRF Zero collected Reduction Filter
  • the light is installed between the lens unit and the image sensor and transmits the light passing through the lens unit to irradiate the image sensor, is configured in a pixel manner, the unit cell by placing an active array (active array) Zone collected Reduction Filter (ZRF) having an LCD (Liquid Crystal Display) in which light transmittance is adjusted for each area partitioned by driving;
  • An image processor which processes an image acquired by the image sensor as data;
  • a ZRF controller configured to calculate brightness of a plurality of divided regions of the image from the data processed by the image processor, and to control light transmittance of the region of the LCD to reduce the brightness difference between the regions in the image.
  • An image quality improving device is provided.
  • the ZRF may be installed to be biased toward the image sensor between the IR cut filter installed between the lens unit and the image sensor and the image sensor.
  • the ZRF includes glass attached to both sides of the LCD, and first and second polarizing plates for polarizing light in a direction orthogonal to each other on the exposed surfaces of the glass, respectively, and are normally white.
  • the ZRF controller is configured to minimize the control of the light transmittance of the area of the LCD when the brightness difference of a plurality of areas divided in the image from the data processed by the image processor is within a normal range, It is possible to avoid performing control of the transmittance.
  • the LCD may have an area corresponding to a plurality of pixels as one unit in the image sensor.
  • polarization regions may be uniformly or unevenly discontinuously formed in one direction, and a plurality of discontinuous arrangements of the polarization regions may be formed side by side.
  • the first and second polarizers may be formed of a wire grid polarizer.
  • the first and second polarizing plates are formed on the substrate of the light transmissive material so that the uneven parts made of a light-transmissive dielectric material or polymer are patterned in the uneven shape in one direction and side by side, and are inclined in the same direction for each inside of the grooves of the uneven parts.
  • White metal can be deposited.
  • the ZRF controller extracts a light failure region as a region that deviates from a predetermined brightness difference from the overall brightness among the regions of the image, and extracts a correction region as a region that contributes to the formation of the light failure region among the regions of the image sensor. And extracting, as an adjusting region, a region that transmits light irradiated to the correction region from the area of the LCD, and adjusting the light transmittance of the adjusting region to be inversely proportional to the brightness of the light defective region.
  • the lens unit is incident light; An image sensor installed at the rear of the lens unit; A main control unit controlling the image acquired by the image sensor to be stored in a memory unit; And an image quality improvement unit installed to control the light transmittance irradiated to the image sensor so as to reduce the brightness difference between the regions in the image acquired by the image sensor.
  • the image quality improvement unit may further improve image quality according to an aspect of the present invention.
  • a digital photographing apparatus which is an apparatus, is provided.
  • the digital photographing apparatus may be any one of a portable digital camera, a CCTV camera, a camera of a portable electronic device, a web camera, a camera module of a vision inspector, and a camera module of a black box.
  • ZRF Zone collected Reduction Filter
  • the adjusting of the light transmittance may include extracting a light defective area as an area deviating from a predetermined brightness difference from the overall brightness among the areas of the image, and correcting it as an area contributing to the formation of the light defective area from the area of the image sensor.
  • An area may be extracted, and an area for transmitting light irradiated to the correction area among the areas of the LCD may be extracted as an adjustment area, and the light transmittance of the adjustment area may be adjusted in inverse proportion to the brightness of the light defective area.
  • the present invention is industrially applicable to digital photographing apparatus.
  • IR cut filter 240 main control unit

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Blocking Light For Cameras (AREA)
  • Studio Devices (AREA)

Abstract

La présente invention concerne un appareil d'amélioration de la qualité d'image, un appareil de photographie numérique muni de celui-ci, et un procédé d'amélioration de la qualité d'image, l'appareil d'amélioration de la qualité d'image comportant: un filtre de réduction à collecte par zones (ZRF) qui est disposé entre une unité d'objectif et un capteur d'image pour laisser une lumière ayant pénétré dans l'unité d'objectif pénétrer dans et être irradiée sur le capteur d'image, et qui est doté d'un affichage à cristaux liquides (LCD) pour lequel le taux de pénétration de la lumière pour chaque zone issue d'une partition multiple est régulé; une unité de traitement d'image servant à traiter une image acquise par le capteur d'image pour obtenir des données; et une unité de commande de ZRF servant à calculer, au moyen des données traitées par l'unité de traitement d'image, la luminosité de la pluralité de zones en lesquelles l'image a été partitionnée, et à réguler le taux de pénétration de la lumière dans les zones du LCD de façon à réduire le différentiel de luminosité entre les zones de l'image. Selon la présente invention, s'il existe un différentiel de luminosité excessif en raison d'une saturation lumineuse excessive ou d'une lumière insuffisante dans chaque zone au sein d'un seul écran, alors en régulant le taux de pénétration de la lumière pour chaque partie au moyen d'un ZRF disposé entre l'unité d'objectif et le capteur d'image, une image présentant une reproduction des couleurs et une netteté exceptionnelles peut être acquise.
PCT/KR2014/006631 2014-05-21 2014-07-22 Appareil d'amélioration de la qualité d'image, appareil de photographie numérique muni de celui-ci, et procédé d'amélioration de la qualité d'image WO2015178534A1 (fr)

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KR1020140060776A KR101592407B1 (ko) 2014-05-21 2014-05-21 화질 개선 장치, 이를 가지는 디지털 촬영 장치 및 화질 개선 방법
KR10-2014-0060776 2014-05-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113596293A (zh) * 2021-07-08 2021-11-02 维沃移动通信（杭州）有限公司 摄像模组和电子设备
WO2022253300A1 (fr) * 2021-06-04 2022-12-08 简伟明 Appareil et procédé de commande de génération d'image basés sur un appareil à cristaux liquides lcd

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JP2000092383A (ja) * 1998-09-16 2000-03-31 Konica Corp 画像入力装置、画像入力方法、透過フィルタ調整方法、透過フィルタ測定方法及び画像出力方法
JP2005167465A (ja) * 2003-12-01 2005-06-23 Fuji Photo Film Co Ltd デジタルカメラ及びデジタルカメラの撮像方法
KR100708938B1 (ko) * 2005-11-07 2007-04-17 삼성전기주식회사 액정 광량 조절장치 및 이를 이용한 카메라 모듈 및 액정광량 조절장치를 이용한 카메라
JP2012095219A (ja) * 2010-10-28 2012-05-17 Canon Inc 撮像装置およびその制御方法
US20130300986A1 (en) * 2012-05-11 2013-11-14 Industry-Academic Cooperation Foundation Yonsei University Wire grid polarizer and method for fabricating thereof, liquid crystal display panel and liquid crystal display device having the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000092383A (ja) * 1998-09-16 2000-03-31 Konica Corp 画像入力装置、画像入力方法、透過フィルタ調整方法、透過フィルタ測定方法及び画像出力方法
JP2005167465A (ja) * 2003-12-01 2005-06-23 Fuji Photo Film Co Ltd デジタルカメラ及びデジタルカメラの撮像方法
KR100708938B1 (ko) * 2005-11-07 2007-04-17 삼성전기주식회사 액정 광량 조절장치 및 이를 이용한 카메라 모듈 및 액정광량 조절장치를 이용한 카메라
JP2012095219A (ja) * 2010-10-28 2012-05-17 Canon Inc 撮像装置およびその制御方法
US20130300986A1 (en) * 2012-05-11 2013-11-14 Industry-Academic Cooperation Foundation Yonsei University Wire grid polarizer and method for fabricating thereof, liquid crystal display panel and liquid crystal display device having the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022253300A1 (fr) * 2021-06-04 2022-12-08 简伟明 Appareil et procédé de commande de génération d'image basés sur un appareil à cristaux liquides lcd
CN113596293A (zh) * 2021-07-08 2021-11-02 维沃移动通信（杭州）有限公司 摄像模组和电子设备

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