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WO2016011872A1 - Procédé et appareil de photographie d'une image et support de stockage informatique - Google Patents

Procédé et appareil de photographie d'une image et support de stockage informatique Download PDF

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Publication number
WO2016011872A1
WO2016011872A1 PCT/CN2015/082399 CN2015082399W WO2016011872A1 WO 2016011872 A1 WO2016011872 A1 WO 2016011872A1 CN 2015082399 W CN2015082399 W CN 2015082399W WO 2016011872 A1 WO2016011872 A1 WO 2016011872A1
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WO
WIPO (PCT)
Prior art keywords
image
output
output image
determined
abnormal
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Application number
PCT/CN2015/082399
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English (en)
Chinese (zh)
Inventor
魏强
崔小辉
苗雷
里强
谭焕清
Original Assignee
努比亚技术有限公司
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Application filed by 努比亚技术有限公司 filed Critical 努比亚技术有限公司
Publication of WO2016011872A1 publication Critical patent/WO2016011872A1/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
    • H04N23/70—Circuitry for compensating brightness variation in the scene

Definitions

  • the present invention relates to the field of imaging technology, and in particular, to an image capturing method, apparatus, and computer storage medium.
  • Star-track shooting refers to the shooting mode in which the shooting device captures the running trajectory of the star through continuous exposure for a long time.
  • the exposure time usually takes 20 to 60 minutes, and the photosensitive hardware capable of supporting long-time exposure is expensive.
  • professional camera devices such as SLR cameras are equipped with the aforementioned photosensitive hardware, and for digital cameras such as digital Cameras, mobile phones, tablets, etc. cannot be equipped with such expensive photosensitive hardware.
  • Embodiments of the present invention are directed to providing an image capturing method, apparatus, and computer storage medium, which aim to eliminate interference of abnormal bright spots on the star track shooting process and improve shooting results.
  • an embodiment of the present invention provides an image capturing method, including:
  • the image is collected and output every preset time to determine whether there is an abnormal bright spot in the output image
  • the base image synthesized for the first time is a first output image with no abnormal bright spots or a preset image.
  • the synthesizing the output image and the base image into a composite image includes:
  • the pixel of the base image at the same position is replaced with the pixel of the output image, and image synthesis is performed.
  • whether the abnormal output point in the image that is determined to be output includes:
  • whether the image of the outputted image has an area abnormality includes:
  • whether the image of the outputted image has an area abnormality includes:
  • the bright point of determining whether there is a track abnormality in the output image includes:
  • the bright point of determining whether there is a track abnormality in the output image includes:
  • the bright point of determining whether there is a track abnormality in the output image includes:
  • the determining the base image includes: using the output image of the first non-abnormal bright spot as the base image.
  • the embodiment of the invention simultaneously provides an image capturing device, which comprises an output module, a judging module, a synthesizing module and a display module, wherein:
  • the output module is configured to collect an image and output it every preset time
  • the determining module is configured to determine whether there is an abnormal bright spot in the image output by the output module; when it is determined that there is no abnormal bright spot in the output image, the output image is sent to the synthesizing module;
  • the synthesizing module is configured to determine a base image, synthesize the image sent by the judging module and the base image into a composite image, and use the composite image as a base image for the next synthesis;
  • the base image is the first output image with no abnormal bright spots or a preset image;
  • the display module is configured to display a composite image synthesized by the synthesis module.
  • the synthesizing module is configured to:
  • the pixel of the base image at the same position is replaced with the pixel of the output image, and image synthesis is performed.
  • the determining module is configured to:
  • the determining module is configured to:
  • the determining module is configured to:
  • the determining module is configured to:
  • the determining module is configured to:
  • the determining module is configured to:
  • the synthesizing module is configured to use the output image of the first non-abnormal bright spot as a base image.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are configured to execute the image capturing method according to the embodiment of the present invention.
  • An image capturing method, device and computer storage medium provided by an embodiment of the present invention first determine whether there is an abnormal bright spot in the image before performing image synthesis on the image outputted after the acquisition, and discard the currently output image if there is an abnormal bright spot. No synthesis, only images with no abnormal bright spots are screened for synthesis, to avoid the effect of abnormal highlights affecting the final composite image, eliminating the interference of abnormal highlights such as fireflies and airplanes on the star-track shooting process, improving the star-track shooting effect and improving The user experience.
  • FIG. 1 is a flow chart of an embodiment of an image capturing method of the present invention
  • FIG. 2 is a block diagram showing the structure of an image capturing apparatus of the present invention
  • Figure 3 is a block diagram showing the main electrical configuration of a camera of one embodiment of the present invention.
  • the image capturing method of the embodiment of the invention is mainly applied to the star-track shooting, that is, the motion trajectory of the shooting stars, and the formation of the motion trajectory is caused by the relative motion between the photographer and the shooting target, and thus can also be applied to similar motions.
  • the star-track shooting that is, the motion trajectory of the shooting stars
  • the formation of the motion trajectory is caused by the relative motion between the photographer and the shooting target, and thus can also be applied to similar motions.
  • Application scenario The following examples are described in detail by taking star track shooting as an example.
  • FIG. 1 is a flow chart of an embodiment of an image capturing method of the present invention. referring to FIG. 1, the image capturing method includes the following steps:
  • Step S101 Acquire an image and output it every preset time.
  • the photographing device collects and outputs the image by the camera at a preset time interval, and the preset time interval is the exposure time, for example, it can be set to 40 seconds (S) to 60S, 5S to 10S, and the like.
  • Step S102 determining whether there is an abnormal bright spot in the output image.
  • the abnormal bright spots that is, the highlights of non-stars, such as fireflies flying in front of the camera, airplanes flying in the sky, and the like.
  • the bright spot described in this embodiment refers to a pixel point whose brightness value is greater than a preset threshold.
  • the area occupied by the abnormal bright spot in the image is usually large, so the area of the bright spot in the image can be determined. Whether it is abnormal, to determine whether there is an abnormal bright spot in the image, that is, to identify the abnormal bright spot by the size of the area of the bright spot.
  • the approximate area occupied by the star in the image is known, and a threshold value is set according to the approximate area.
  • the bright point is determined.
  • Non-star highlights determine that there are unusual bright spots in the image.
  • the statistical value of the area of the normal bright spot ie, the bright spot of the star
  • the statistical value may be an image of the current output, an image of the past no abnormal bright spot, or an arithmetic mean of all the bright spot areas in the base image, and the weighting.
  • the preset threshold is set to be 20% to 50%.
  • the length of the abnormal bright spots in the image is longer than the length of the stars, so the abnormal bright spots can be identified by the track length of the bright points.
  • the approximate length of the trajectory of the star in the image is known, and a threshold value is set according to the approximate length; when it is determined that there is a bright point in the image whose track length is greater than a preset threshold, then it is determined The bright spot is not a bright spot of the star, and it is determined that there is an abnormal bright spot in the image.
  • the statistic value of the length of the normal bright point trajectory is first obtained, and the statistic value may be an image of the current output, an image of an abnormally bright spot that has been output in the past, or an arithmetic mean of the lengths of all the bright point trajectories in the base image, a weighted average value, and Number of bits, etc.; after obtaining the statistical value, when it is judged that there is a bright spot in the image that is outputted that the track length exceeds the statistical value by a preset threshold, Then, it is determined that the bright spot is not a bright spot of the star, and it is determined that there is an abnormal bright spot in the image; wherein the preset threshold is set to be 20% to 50%.
  • the running trajectory of the stars has a certain rule to follow, and the running trajectories of all the stars are roughly the same, it is also possible to identify the abnormal bright spots by the trajectory direction of the bright points.
  • the direction of the track of the normal bright spot is obtained, and the current output image, the image of the past no abnormal bright spot or the track direction of most bright spots in the base image is taken as the track direction of the normal bright spot; after obtaining the track direction of the normal bright spot, when It is judged that there is a bright point in the output image that deviates from the preset range of the normal bright point track direction, and then the bright point of the non-star is determined, and it is determined that there is an abnormal bright spot in the image, and the preset range is set to ⁇ 10%.
  • the brightness of the bright spot may also be used to identify the abnormal bright spot.
  • the bright spot is determined to be an abnormal bright spot.
  • the plurality of abnormal bright spot recognition methods may be combined to determine the abnormal bright spot to improve the accuracy.
  • step S103 When it is determined that there is an abnormal bright spot in the output image, the process proceeds to step S103; when it is determined that there is no abnormal bright spot in the currently output image, the process proceeds to step S104.
  • Step S103 Discard the output image.
  • step S102 If there is an abnormal bright spot in the currently output image, the image is discarded and not synthesized, so as not to affect the effect of the composite image. At the same time, returning to step S102, the detection of the next image output is continued.
  • Step S104 Determine a base image, synthesize the output image and the base image into a composite image, and use the composite image as a base image for the next synthesis.
  • the image is synthesized.
  • the base image is first determined.
  • the base image is the first image of the output without the abnormal bright spot or the preset image.
  • the output image is after the start of shooting
  • the output of the first image without abnormal highlights can be used as the base image before the shooting; or there is no preset image, the first image without abnormal highlights is not synthesized, when the output has no abnormal bright spots
  • the synthesis processing is performed only when two images are used, and at this time, the image of the first output without abnormal bright spots is used as the base image.
  • the composite image obtained by the previous synthesis is determined as the base image of the synthesis.
  • the photographing device determines whether the brightness of the pixel of the image outputted at the same position is greater than the brightness of the pixel of the base image; and determining whether the brightness of the pixel of the image outputted by the same position is greater than the pixel of the base image.
  • luminance pixels of the same position base image are replaced with pixels of the output image, image synthesis is performed, a composite image is generated, and the composite image is used as a base image for the next image synthesis.
  • Step S105 Display the composite image.
  • the composite image is displayed on the display screen in real time, and the process returns to step S102 to continue detecting the next image to be output, and preparing for the next image synthesis.
  • image acquisition and image synthesis are performed synchronously to facilitate the user to view the currently generated composite image in real time; before each image is acquired and image synthesis is performed, it is detected whether there is any image in the output image.
  • Abnormal bright spots if there are abnormal bright spots, discard the currently acquired images without synthesizing, and only combine the images with no abnormal bright spots and the base images to eliminate the images with abnormal bright spots, and prevent the images with abnormal bright spots from being synthesized.
  • the final composite image affects the quality of the photo, eliminating the interference of abnormal objects such as fireflies and airplanes on the star-track shooting process, and improving the shooting effect.
  • the image capturing apparatus may be a general digital camera such as a card camera, or may have Terminal devices such as mobile phones and tablet computers with camera functions.
  • the image capturing device includes an output module 21, a determining module 22, a synthesizing module 23, and a display module 24; among them,
  • the output module 21 is configured to collect images and output them every preset time; specifically, the images are collected by the camera at preset time intervals, and the preset time interval is an exposure time, for example, it can be set to 40S to 60S, 5S ⁇ 10S and so on.
  • the determining module 22 is configured to determine whether there is an abnormal bright spot in the image output by the output module 21; when it is determined that there is no abnormal bright spot in the output image, the output image is sent to the synthesizing module 23; When it is determined that there is an abnormal bright spot in the output image, the image is discarded;
  • the compositing module 23 is configured to determine a base image, synthesize the image sent by the determining module 22 and the base image into a composite image, and use the composite image as a base image for the next synthesis;
  • the base image is a first output image with no abnormal bright spots or a preset image;
  • the display module 24 is configured to display a composite image synthesized by the synthesis module 23.
  • the abnormal bright spots that is, non-star highlights, such as fireflies flying in front of the camera, airplanes flying in the sky, and the like.
  • the bright spot described in this embodiment refers to a pixel point whose brightness value is greater than a preset threshold.
  • the judging module 22 judges the image by determining whether the area of the bright spot in the image is abnormal. Whether there is an abnormal bright spot, that is, the abnormal bright spot is identified by the size of the area of the bright spot. For example, determining whether there is a bright spot whose area is larger than the preset value in the output image, or determining whether there is a bright spot in the output image that exceeds the statistical value of the area of the normal bright spot by a preset threshold; if yes, it is determined that the output image has The highlight of the area is abnormal.
  • the determining module 22 determines whether there is an abnormal bright spot in the image by determining whether the trajectory of the bright spot in the image is abnormal, that is, identifying the abnormal bright spot by the track length or/and the direction of the bright spot. For example, considering that the stars run slower, and the abnormal bright spots move relatively fast, the length of the abnormal bright spots in the image is longer than the length of the stars, so The abnormal bright spot is identified by the length of the track passing through the bright spot. Specifically, it can be determined whether there is a bright point whose track length is greater than a preset value in the output image, or whether the output image has a bright point whose track length exceeds the statistical value of the normal bright point track length by a preset threshold; if yes, the determination is performed.
  • the output image has bright spots with abnormal trajectories.
  • the determining module 22 first obtains the trajectory direction of the normal bright spot, and can use the current output image, the image of the past no abnormal bright spot or the trajectory direction of most bright points in the base image as the trajectory direction of the normal bright spot; and obtain the trajectory of the normal bright spot After the direction, when it is judged that there is a bright point in the output image that deviates from the preset range of the normal bright point track direction, it is determined that the bright spot is not a bright spot of the star, and it is determined that there is an abnormal bright spot in the image, and the preset range is set to ⁇ 10%. .
  • the determining module 22 may further identify the abnormal bright spot by using the brightness of the bright spot.
  • the determining module 22 may further identify the abnormal bright spot by using the brightness of the bright spot.
  • the determining is performed.
  • the highlight is an unusual highlight.
  • the determining module 22 may combine the plurality of abnormal bright spot recognition methods to determine the abnormal bright spot to improve the accuracy.
  • the synthesizing module 23 first determines the base image.
  • the base image is the first image of the output without the abnormal bright spot or the preset image. For example, if the output image is the first image with no abnormal bright spots output after the start of shooting, the image preset before shooting can be used as the base image; or there is no preset image, and the first image without abnormal highlights is not synthesized.
  • the synthesis processing is performed, and at this time, the image of the first output without the abnormal bright spot is used as the base image.
  • the composite image obtained by the previous synthesis is determined as the base image of the synthesis.
  • the synthesizing module 23 determines whether the brightness of the pixel of the image currently outputted at the same position is greater than the base image. The brightness of the pixel; if so, the pixel of the base image of the same position is replaced with the pixel of the output image, and image synthesis is performed accordingly, and a composite image is generated, and the composite image is used as a base image for the next image synthesis.
  • image acquisition and image synthesis are performed synchronously to facilitate the user to view the currently generated composite image in real time.
  • the image capturing device can be implemented by a digital camera, a device with a camera (such as a mobile phone, a tablet computer, a notebook computer, etc.), and an output module 21 and a determination module 22 in the imaging device.
  • the synthesis module 23 can be passed through a central processing unit (CPU), a digital signal processor (DSP) or a programmable gate array (FPGA) in the image capturing device. Field-Programmable Gate Array) is implemented; the display module 24 in the camera device can be implemented in a practical application by a display screen or display in the image capture device.
  • FIG. 6 is a block diagram showing the main electrical configuration of a camera of one embodiment of the present invention.
  • the photographic lens 101 is composed of a plurality of optical lenses for forming a subject image, and is a single focus lens or a zoom lens.
  • the photographic lens 101 can be moved in the optical axis direction by the lens driving unit 111, and controls the focus position of the taking lens 101 based on the control signal from the lens driving control unit 112, and also controls the focus distance in the case of the zoom lens.
  • the lens drive control circuit 112 performs drive control of the lens drive unit 111 in accordance with a control command from the microcomputer 107.
  • An imaging element 102 is disposed in the vicinity of a position where the subject image is formed by the photographing lens 101 on the optical axis of the photographing lens 101.
  • the imaging element 102 functions as an imaging unit that captures a subject image and acquires captured image data.
  • Photodiodes constituting each pixel are two-dimensionally arranged in a matrix on the imaging element 102. Each photodiode generates a photoelectric conversion current corresponding to the amount of received light, and the photoelectric conversion current is charged by a capacitor connected to each photodiode.
  • the front surface of each pixel is provided with a Bayer array of RGB color filters.
  • the imaging element 102 is connected to an imaging circuit 103 that performs charge accumulation control and image signal readout control in the imaging element 102, and performs waveform shaping after reducing the reset noise of the read image signal (analog image signal). Further, gain improvement or the like is performed to obtain an appropriate signal level.
  • the imaging circuit 103 is connected to the A/D conversion unit 104, which performs analog-to-digital conversion on the analog image signal, and outputs a digital image signal (hereinafter referred to as image data) to the bus 199.
  • image data a digital image signal
  • the bus 199 is a transmission path for transmitting various data read or generated inside the camera.
  • the A/D conversion unit 104 is connected to the bus 199, and an image processor 105, a JPEG processor 106, a microcomputer 107, a SDRAM (Synchronous DRAM) 108, and a memory interface (hereinafter referred to as a memory I/F) are connected. 109. LCD (Liquid Crystal Display) driver 110.
  • the image processor 105 performs various kinds of images such as OB subtraction processing, white balance adjustment, color matrix calculation, gamma conversion, color difference signal processing, noise removal processing, simultaneous processing, edge processing, and the like on the image data based on the output of the imaging element 102. deal with.
  • the JPEG processor 106 compresses the image data read out from the SDRAM 108 in accordance with the JPEG compression method. Further, the JPEG processor 106 performs decompression of JPEG image data for image reproduction display. At the time of decompression, the file recorded on the recording medium 115 is read, and after the compression processing is performed in the JPEG processor 106, the decompressed image data is temporarily stored in the SDRAM 108 and displayed on the LCD 116. Further, in the present embodiment, the JPEG method is adopted as the image compression/decompression method. However, the compression/decompression method is not limited thereto, and other compression/decompression methods such as MPEG, TIFF, and H.264 may be used.
  • the microcomputer 107 functions as a control unit of the entire camera, and collectively controls various processing sequences of the camera.
  • the microcomputer 107 is connected to the operation unit 113 and the flash memory 114.
  • the operation unit 113 includes but not limited to a physical button or a virtual button, the entity or virtual
  • the button can be used as a power button, a camera button, an edit button, a dynamic image button, a reproduction button, a menu button, a cross button, an OK button, a delete button, an enlargement button, and the like, and various operation buttons such as various input buttons, and the like.
  • the operating state of the operating member is not limited to a physical button or a virtual button, the entity or virtual
  • the button can be used as a power button, a camera button, an edit button, a dynamic image button, a reproduction button, a menu button, a cross button, an OK button, a delete button, an enlargement button, and the like, and various operation buttons such as various input buttons, and the like.
  • the detection result is output to the microcomputer 107.
  • a touch panel is provided on the front surface of the LCD 116 as a display portion, and the touch position of the user is detected, and the touch position is output to the microcomputer 107.
  • the microcomputer 107 executes various processing sequences corresponding to the operation of the user based on the detection result of the operation member from the operation unit 113. (Similarly, this place can be changed to the computer 107 to execute various processing sequences corresponding to the user's operation based on the detection result of the touch panel on the front of the LCD 116.)
  • the flash memory 114 stores programs for executing various processing sequences of the microcomputer 107.
  • the microcomputer 107 performs overall control of the camera in accordance with the program. Further, the flash memory 114 stores various adjustment values of the camera, and the microcomputer 107 reads out the adjustment value, and performs control of the camera in accordance with the adjustment value.
  • the SDRAM 108 is an electrically rewritable volatile memory for temporarily storing image data or the like.
  • the SDRAM 108 temporarily stores image data output from the A/D conversion unit 104 and image data processed in the image processor 105, the JPEG processor 106, and the like.
  • the memory interface 109 is connected to the recording medium 115, and performs control for writing image data and a file header attached to the image data to the recording medium 115 and reading from the recording medium 115.
  • the recording medium 115 is, for example, a recording medium such as a memory card that can be detachably attached to the camera body.
  • the recording medium 115 is not limited thereto, and may be a hard disk or the like built in the camera body.
  • the LCD driver 110 is connected to the LCD 116, and stores image data processed by the image processor 105 in the SDRAM.
  • the image data stored in the SDRAM is read and displayed on the LCD 116, or the image data stored in the JPEG processor 106 is compressed.
  • the JPEG processor 106 reads the compressed image data of the SDRAM, decompresses it, and displays the decompressed image data on the LCD 116.
  • the LCD 116 is disposed on the back surface of the camera body or the like to perform image display.
  • the LCD116 is provided A touch panel that detects a user's touch operation.
  • the liquid crystal display panel (LCD 116) is disposed as the display portion.
  • the present invention is not limited thereto, and various display panels such as an organic EL may be employed.
  • the image capturing apparatus of the present invention first determines whether there is an abnormal bright spot in the image before performing image synthesis on the image to be output and output. If there is an abnormal bright spot, the image that is currently output is discarded, and only the abnormal bright spot is selected.
  • the images are synthesized to avoid the effects of abnormal highlights affecting the final composite image, eliminating the interference of abnormal objects such as fireflies and airplanes on the star-track shooting process, improving the shooting effect and improving the user experience.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner such as: multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored or not executed.
  • the coupling, or direct coupling, or communication connection of the components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may be electrical, mechanical or other forms. of.
  • the units described above as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit;
  • the unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the readable storage medium when executed, executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: a mobile storage device, a read-only memory (ROM), a random access memory (Various media that can store program code, such as RAM (Random Access Memory), disk or optical disk.
  • ROM read-only memory
  • RAM Random Access Memory
  • the above-described integrated unit of the present invention may be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a standalone product.
  • the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes various media that can store program codes, such as a mobile storage device, a ROM, a RAM, a magnetic disk, or an optical disk.
  • the embodiment of the invention is synchronously performed by image acquisition and image synthesis, so as to facilitate the user to view the currently generated composite image in real time; before each image is output and the image is synthesized, it is detected whether there is an abnormal bright spot in the output image, if any If the abnormal highlight is present, the currently acquired image will not be synthesized, and only the image with no abnormal highlights will be combined with the base image, thereby eliminating the image with abnormal highlights and preventing the image with abnormal highlights from being synthesized into the final composite image. It affects the quality of photos, eliminates the interference of abnormal objects such as fireflies and airplanes on the star-track shooting process, and improves the shooting effect.

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Abstract

L'invention concerne un procédé et un appareil de photographie d'une image, ainsi qu'un support de stockage informatique. Le procédé de photographie d'une image comprend les étapes consistant à : collecter une image et la sortir à chaque instant préréglé ; déterminer s'il existe un point brillant anormal dans l'image de sortie ; si tel n'est pas le cas, déterminer une image de base, synthétiser l'image de sortie et l'image de base en une image de synthèse et utiliser l'image de synthèse au titre de l'image de base pour la prochaine synthèse ; et afficher l'image de synthèse synthétisée selon un processus de photographie.
PCT/CN2015/082399 2014-07-22 2015-06-25 Procédé et appareil de photographie d'une image et support de stockage informatique WO2016011872A1 (fr)

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CN201410350273.9A CN104113692B (zh) 2014-07-22 2014-07-22 图像拍摄方法和装置

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CN104113692B (zh) * 2014-07-22 2015-11-25 努比亚技术有限公司 图像拍摄方法和装置
KR20170014556A (ko) * 2015-07-30 2017-02-08 삼성전자주식회사 이동체를 촬영하는 방법 및 촬영 장치.
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CN112130946B (zh) * 2020-09-22 2024-03-26 西安宇视信息科技有限公司 一种飞机信息展示方法、装置、电子设备和存储介质
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