WO2011069467A1 - Téléphone mobile doté d'un appareil photo intégré et d'une fonction de prévention des tremblements et procédé associé de prévention des tremblements lors d'un processus de prise de vues - Google Patents

Téléphone mobile doté d'un appareil photo intégré et d'une fonction de prévention des tremblements et procédé associé de prévention des tremblements lors d'un processus de prise de vues Download PDF

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Publication number
WO2011069467A1
WO2011069467A1 PCT/CN2010/079656 CN2010079656W WO2011069467A1 WO 2011069467 A1 WO2011069467 A1 WO 2011069467A1 CN 2010079656 W CN2010079656 W CN 2010079656W WO 2011069467 A1 WO2011069467 A1 WO 2011069467A1
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WO
WIPO (PCT)
Prior art keywords
mobile phone
jitter
camera
photographing
gravity sensor
Prior art date
Application number
PCT/CN2010/079656
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English (en)
Chinese (zh)
Inventor
钟日丽
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惠州Tcl移动通信有限公司
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Filing date
Publication date
Application filed by 惠州Tcl移动通信有限公司 filed Critical 惠州Tcl移动通信有限公司
Priority to ES10835502.5T priority Critical patent/ES2623803T3/es
Priority to US13/381,948 priority patent/US9167159B2/en
Priority to EP10835502.5A priority patent/EP2512110B1/fr
Publication of WO2011069467A1 publication Critical patent/WO2011069467A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681—Motion detection
    • H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/683—Vibration or motion blur correction performed by a processor, e.g. controlling the readout of an image memory
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0007—Movement of one or more optical elements for control of motion blur
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2217/00—Details of cameras or camera bodies; Accessories therefor
    • G03B2217/005—Blur detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/52—Details of telephonic subscriber devices including functional features of a camera

Definitions

  • the invention relates to the field of a mobile phone with a photographing function and an anti-shake method in the photographing process thereof. More specifically, the improvement relates to a camera phone with anti-shake function and an anti-shake method in photographing.
  • the anti-shake design of the analog digital camera will not only greatly increase the technical cost of the mobile phone, but also the size and size of the mobile phone will largely limit the technical application of the digital camera, so that the anti-shake effect of the mobile phone camera is always unsatisfactory.
  • the object of the present invention is to provide a camera phone with anti-shake function and an anti-shake method in photographing, which can realize an anti-shake effect on a mobile phone at a low cost, and is particularly suitable for use in a smart phone. on.
  • An anti-shake method for a mobile phone in photographing includes the following steps:
  • the jitter level of the mobile phone is detected by the gravity sensor module on the mobile phone;
  • step A specifically includes:
  • A1 starting the anti-shake operation mode of the gravity sensor module by pressing and holding a shutter button on the mobile phone;
  • A2 detecting a jitter vector occurring in each direction when photographing, and calculating an absolute value of the sum of the jitter vectors
  • A3. Determine the jitter level at the time of photographing according to the calculated absolute value.
  • step A further comprises sampling the jitter data detected by the gravity sensor module a plurality of times, and taking an average value thereof for determining a jitter level.
  • the anti-shake method further comprising: before the step A:
  • step C specifically includes:
  • step C further comprises: sampling the displacement vector generated by the jitter during the sampling process a plurality of times, and taking an average value thereof for performing image sharpening processing.
  • a camera phone with anti-shake function includes a central processing unit located on the main board of the mobile phone and a camera module disposed on the outer casing of the mobile phone; the central processor loads a driver program of the camera module for pressing Taking a picture of the image when the shutter button is pressed on the mobile phone; wherein the mobile phone further includes a gravity sensor module and an image post-processing module; the central processor loads a driver of the gravity sensor module for detecting the a jitter level when the mobile phone is photographed to control an exposure time of the camera module during photographing; the central processing unit runs an image processing software program of the image post-processing module for combining the displacement vector generated by the jitter to the blurred The image is sharpened.
  • the gravity sensor module further includes a working register, wherein the central processor sets a data value in the working register, so that the gravity sensor module is in an anti-shake operation mode.
  • the gravity sensor module is a first-class interface device, and the driver of the gravity sensor module is an independent streaming interface driver.
  • the camera module is a first-class interface device, and the driver of the camera module is an independent streaming interface driver.
  • the invention provides a camera phone with anti-shake function and an anti-shake method in photographing, and adopts a gravity sensor and an image post-processing technology to control the exposure time according to the jitter level detected when the phone is photographed.
  • FIG. 2 is a flow chart showing the working process of a gravity sensor (g-sensor) according to the present invention
  • FIG. 4 is a block diagram of a streaming interface driver design of a camera in the present invention.
  • FIG. 5 is a block diagram of a flow interface drive design of a gravity sensor (g-sensor) according to the present invention.
  • FIG. 6 is a hardware block diagram of a camera module in the present invention.
  • Figure 7 is a hardware block diagram of a g-sensor module in the present invention.
  • One embodiment of the anti-shake method of the mobile phone in the photographing of the present invention includes the following steps:
  • Step S101 pressing a shutter of a camera on a mobile phone
  • Step S102 Before entering the photographing period, the gravity sensor (g-sensor) on the mobile phone detects the degree of jitter during photographing and determines the jitter level; the so-called photographing period refers to the time period before the photographing exposure after the shutter is pressed;
  • Step S103 The camera controls the exposure time according to the jitter level
  • Steps S104a and S104b on the one hand, the camera performs photographing according to the specified exposure time; on the other hand, g-sensor calculates a displacement vector generated by the jitter during the exposure time (ie, during photographing) for the camera to read;
  • Step S105 After entering the photographing stage, the camera reads the displacement vector, and according to the analysis result of the image blurring condition, the image processing software is used to perform image compensation processing for clearing the image; the so-called photographing late period refers to the time when only the image processing is completed after the photographing exposure. segment.
  • step S102 since the detection of the shake level is obtained in the period before the exposure after the shutter is pressed, the photographing is not affected.
  • the exposure time may be further divided into several levels according to the jitter level, and the higher the jitter level, the shorter the exposure time; and before step S102, the correspondence table of the jitter level and the exposure time may be preset to facilitate the table lookup. Determine the exposure time.
  • step S104a the method for instantaneously capturing a plurality of photos and extracting feature points may be used to analyze the blur condition of the image for the compensation processing of the back end; the feature points extracted here may be the same feature points in multiple photos, As used in existing digital cameras, it is well known in the art.
  • the accuracy can be improved by multi-sampling and then averaging.
  • the invention utilizes the high-precision g-sensor accurate three-dimensional space induction, high-precision gravity acceleration detection, high real-time performance and the like, and can detect the gravity acceleration value of the space three axes, thereby detecting the jitter occurring in all directions. And calculate the severity of the jitter, that is, the jitter level.
  • the exposure time is controlled differently when taking pictures; therefore, different jitter levels are specified for different jitter levels, and the camera takes different exposure times to take photos at different jitter levels, thereby flexibly preventing shake.
  • the jitter level is the main parameter used by the camera to control the shutter speed. It is mainly determined by the absolute value of the sum of the gravity acceleration vectors of the three axes of space. The larger the absolute value of the gravity acceleration occurs in a certain direction, the jitter level. The higher the parameter is obtained before the start of the exposure after the shutter is pressed; after the shutter is pressed, the g-sensor starts to work, and the gravitational acceleration values of the x, y, and z axes can be calculated.
  • the vector sum of the gravitational accelerations occurring in a certain direction, and then the absolute value is calculated; the method of averaging by multiple sampling can obtain more accurate results; the setting method of the jitter level is: first set some threshold thresholds Then, the calculated absolute value of the gravitational acceleration in a certain direction is compared with the threshold threshold to obtain the jitter level; since the jitter level is achieved by detecting the severity of the jitter, the severity of the jitter It is also detected by the spatial three-dimensional coordinates. The calculation of the jitter displacement vector is also to calculate the vector in a certain direction through the spatial three-dimensional coordinates. Shift.
  • Step S201 initializing an I2C driver
  • Step S202 initializing the g-sensor working parameter, and the g-sensor driver is loaded during the system startup process
  • Step S203 the creating thread waits for the camera to start taking photos, and sets the anti-shake working state of the g-sensor;
  • Step S204 determining whether the camera shutter is pressed to start photographing, if yes, proceeding to step S205, otherwise continuing to wait;
  • Step S205 Calculate the jitter level in the early stage of photographing, and notify the camera of the anti-shake level;
  • Step S206 calculating a jitter vector displacement, that is, a displacement amount and a direction of the mobile phone during exposure of the photograph;
  • Step S207 waiting for the camera to read the jitter vector displacement after the photographing, and performing post-processing of the image
  • Step S208 determining whether the vector displacement of the current photograph is read, and ending the workflow of the g-sensor, otherwise continuing to wait.
  • the image is analyzed by instantaneously taking multiple photos and extracting feature points, and the blur condition of the image is analyzed, and then the displacement vector generated by the jitter is calculated by g-sensor, according to the previous
  • the jitter vector displacement is the main parameter for the back-end processing of the image. This parameter can know which direction the amount of displacement is dithered when photographing, and then compensate the image according to the displacement amount to realize the back-end processing of the image.
  • the displacement vector refers to the amount of displacement in a certain direction caused by the jitter during the photographing period, that is, during the calculation, the following parameters are needed in the calculation process: the g-sensor's gravitational acceleration value in three axes, and the length of the jitter ( That is, the exposure time); according to these parameters, the displacement vector generated by the jitter can be calculated by a specific algorithm; when the three-axis gravity acceleration value is obtained, the method of multi-sampling and then taking the average value can also be used. The value is more accurate.
  • the overall software communication workflow mainly includes the following aspects: interface call, parameter transfer and data sharing
  • the anti-shake design two methods are mainly used to achieve anti-shake: one method is to increase the sensitivity of the camera after detecting the jitter by g-sensor (High ISO), which increases the shutter speed (reduces the exposure time) and makes the shutter speed exceed the safety shutter to avoid jitter. This method changes the shutter speed, which not only improves the camera's jitter, but also captures moving objects better.
  • Another method is to calculate the amount of jitter by g-sensor, and then analyze and process the obtained image after taking the picture, that is, software displacement compensation for the blurred image taken in the case of jitter, the displacement is g -sensor calculates the jitter displacement vector, which belongs to the backend processing.
  • independent streaming interface driver can be used to build the overall software framework, ie in win On the mobile platform, the Camera driver and the g-sensor driver are designed as independent streaming interface drivers, and their corresponding I2C drivers are designed to communicate with the PXA310. These drivers are loaded during system startup, which can form a clear
  • the hierarchical structure as shown in Figures 4 and 5, facilitates system management.
  • the communication between each module adopts a specific interface, and the data sharing is through a registry, an event or a memory, etc., through these methods, the hierarchical design and the interface call can be made clear, and each module is The communication between the two is stable and efficient.
  • a camera phone with an anti-shake function includes a central processing unit on a main board of the mobile phone and a camera module disposed on the outer casing of the mobile phone; the central processor loads a driver of the camera module for Taking a picture of the image when the shutter button on the mobile phone is pressed; wherein the mobile phone further includes a gravity sensor module and an image post-processing module; the central processor loads a driver of the gravity sensor module for The jitter level of the mobile phone when the camera is photographed is detected in the early stage of the photographing to control the exposure time of the camera module during the photographing process; the central processor runs the software program of the image post-processing module for combining in the late photographing The displacement vector generated by the jitter compensates the blurred image.
  • the gravity sensor module further includes a working register, and the central processor sets a data value in the working register for causing the gravity sensor module to be in an anti-shake operation mode.
  • the gravity sensor module is a first-class interface device
  • the driver of the gravity sensor module is a stand-alone streaming interface driver
  • the camera module is a first-class interface device
  • the camera module The driver is a standalone streaming interface driver.
  • the PXA310 high-performance MCU Take the PXA310 high-performance MCU as an example.
  • the I2C interface is used for communication between the CPU and CAMERA.
  • the CPU sends a command to CAMERA through the I2C interface.
  • the CIF interface is used for receiving the CAMERA data by the PXA310.
  • the gravity sensor module as shown in FIG. 7, the PXA310 and the gravity sensor module mainly pass the I2C interface, the CPU is the master, the g-sensor is the slave, and the CPU is set by the g-sensor.
  • the working register is placed in different working modes, and then by reading the gravity acceleration value of the XYZ three axes, and then using a specific algorithm for analysis and calculation, the displacement vector generated by the mobile phone can be calculated, thereby obtaining various kinds of anti-shake required. parameter.
  • the small size: the high-end g-sensor and camera two modules are very small, for the mobile phone is very sensitive to the size of the electronic products, the benefits are self-evident, the traditional mobile phone camera anti-shake is mainly Working hard on the camera, but that would cause the size of the head to become very large, which is largely limited by the size of the phone. This method effectively avoids the bottleneck of increasing the size of the camera, so that the camera anti-shake can be easily realized without changing the volume of the mobile phone.
  • the high-end g-sensor is used to accurately detect the jitter, and then the camera is double-anti-shake in the pre-photographing and post-photographing, respectively, and the camera can be effectively anti-shake for different periods of time, thus ensuring the protection.
  • the accuracy of the high-end g-sensor is much higher than that of the general sensor, and the jitter when taking pictures is very subtle, so the accuracy requirement for the sensor is very high, and the high-end g-sensor High precision further ensures the anti-shake effect.
  • the stability is good: use the "streaming interface driver" of smart phone communication to combine g-sensor and camera, each module uses a specific interface for communication, data sharing is through the registry, events or memory Therefore, the hierarchical design and interface call are clear, and the communication between modules is efficient and stable.
  • the cost is low: the high-end g-sensor equipped with the mobile phone itself (not used to take anti-shake), the high-end g-sensor has enough spare time to do the camera anti-shake on the basis of other work, on the one hand, it can be fully
  • the role of the high-end g-sensor does not require additional hardware costs for camera anti-shake, so that effective anti-shake can be achieved without increasing hardware costs.
  • the anti-shake is separated from the various performances of the mobile phone camera.
  • the hardware configuration of the mobile phone is very flexible;
  • the software can flexibly control the high-end g-sensor and camera through software, so that the anti-shake can be flexibly controlled by software.
  • the anti-shake can be flexibly controlled by software.
  • the function of the software configuration is very small.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)
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Abstract

La présente invention se rapporte à un téléphone mobile doté d'un appareil photo intégré et d'une fonction de prévention des tremblements et à un procédé associé de prévention des tremblements lors d'un processus de prise de vues. Le procédé comprend les étapes suivantes consistant à : détecter un niveau de tremblement lorsqu'un téléphone mobile prend des photos au moyen d'un capteur de gravité monté sur le téléphone mobile; commander le temps de pose du téléphone mobile lors du processus de prise de vues selon le niveau de tremblement détecté et prendre des photos au moyen d'un module d'appareil photo monté sur le téléphone mobile selon le temps de pose; et effectuer un traitement net sur une image floue en utilisant un programme de logiciel de traitement d'image en combinaison avec un vecteur de déplacement généré par les tremblements. Le procédé réalise à moindre coût une fonction de prise de vues avec un effet idéal empêchant les tremblements sur le téléphone mobile, et convient particulièrement pour être utilisé sur un téléphone mobile intelligent sur lequel est monté un capteur de gravité haut de gamme.
PCT/CN2010/079656 2009-12-11 2010-12-10 Téléphone mobile doté d'un appareil photo intégré et d'une fonction de prévention des tremblements et procédé associé de prévention des tremblements lors d'un processus de prise de vues WO2011069467A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES10835502.5T ES2623803T3 (es) 2009-12-11 2010-12-10 Teléfono móvil con cámara con una función de antivibración y método de antivibración para uso por un teléfono móvil con cámara en la captura de imagen.
US13/381,948 US9167159B2 (en) 2009-12-11 2010-12-10 Camera mobile phone with anti-shaking function and anti-shaking method for use by the camera mobile phone in image capturing
EP10835502.5A EP2512110B1 (fr) 2009-12-11 2010-12-10 Téléphone mobile doté d'un appareil photo intégré et d'une fonction de prévention des tremblements et procédé associé de prévention des tremblements lors d'un processus de prise de vues

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200910188891.7 2009-12-11
CN2009101888917A CN101729665B (zh) 2009-12-11 2009-12-11 一种具有防抖功能的拍照手机及其在拍照中的防抖方法

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WO2011069467A1 true WO2011069467A1 (fr) 2011-06-16

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US (1) US9167159B2 (fr)
EP (1) EP2512110B1 (fr)
CN (1) CN101729665B (fr)
ES (1) ES2623803T3 (fr)
WO (1) WO2011069467A1 (fr)

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CN101729665B (zh) 2013-10-02
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