WO2018076953A1 - 一种拍摄装置和方法 - Google Patents
一种拍摄装置和方法 Download PDFInfo
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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
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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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
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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
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- 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
- This document relates to, but is not limited to, the field of photographing technology, and in particular to a photographing apparatus and method.
- the data of the preview image and the final shooting data will use the same exposure parameters to achieve the same effect as seen.
- the exposure parameter of each preview frame is the sensitivity ISO400
- the exposure time is 1/100 second (S)
- the shooting is performed, and finally the photo with the same parameters is generated, so that the effect of the taken photo and the preview image is obtained. It is basically the same.
- Embodiments of the present invention provide a photographing apparatus and method, which can improve a preview experience of a user, and ensure that a preview image is consistent with a screen effect of photographing a photograph.
- An embodiment of the present invention provides a photographing apparatus, which includes: a first acquiring module and a photographing module;
- a first acquiring module configured to acquire a first shooting parameter of the preview image; wherein the first shooting parameter includes a first shutter speed;
- the photographing module is configured to photograph with a second photographing parameter including a second shutter speed, wherein the second shutter speed is less than the first shutter speed.
- the device further includes a computing module and a second acquiring module;
- a calculation module configured to calculate an exposure value of the preview image according to the first shooting parameter before the shooting module performs shooting
- the second obtaining module is configured to keep the exposure value unchanged to obtain the second shooting parameter.
- the first shutter speed refers to a shutter start speed of the shutter start time t1; t1 ⁇ 1/4s;
- the second shutter speed refers to the shutter start speed at which the shutter start time is t2; t2 ⁇ 1/4 s.
- the first shooting parameter further includes: a first aperture value and a first sensitivity
- the calculation module is configured to calculate an exposure value of the preview image according to the first shooting parameter by:
- the exposure value is calculated by substituting the first shutter level, the first aperture number, and the first photosensitive level into the following first calculation formula:
- EV is the exposure value
- F is the aperture number
- T is the shutter level
- I is the number of light levels.
- the number of photosensitive stages is a minimum number of levels.
- the second shooting parameter further includes: a second aperture value and a second sensitivity
- the second obtaining module is configured to obtain the second shooting parameter by keeping the exposure value unchanged as follows:
- a combination of one or more parameter combinations is used as the second shooting parameter.
- an embodiment of the present invention further provides a shooting method, where the method includes:
- the method further includes:
- the second shooting parameter is obtained while keeping the exposure value unchanged.
- the first shutter speed refers to a shutter start speed of the shutter start time t1; t1 ⁇ 1/4s;
- the second shutter speed refers to the shutter start speed at which the shutter start time is t2; t2 ⁇ 1/4 s.
- the first shooting parameter further includes: a first aperture value and a first sensitivity
- Calculating the exposure value of the preview image according to the first shooting parameter includes:
- EV is the exposure value
- F is the aperture number
- T is the shutter level
- I is the number of light levels.
- the number of photosensitive stages is a minimum number of levels.
- the second shooting parameter further includes: a second aperture value and a second sensitivity
- Keeping the exposure value unchanged to obtain the second shooting parameters includes:
- a combination of one or more parameter combinations is used as the second shooting parameter.
- an embodiment of the present invention further provides a mobile terminal, including:
- Memory set to store instructions
- the processor configured to execute the instructions, implements the following shooting steps:
- the photographing is performed using a second photographing parameter including a second shutter speed, wherein the second shutter speed is less than the first shutter speed.
- the processor is further configured to execute the instruction to implement the following shooting steps:
- the second shooting parameter is acquired while maintaining the exposure value.
- the first shooting parameter further includes: a first aperture value and a first sensitivity
- the processor is configured to implement an execution instruction to calculate an exposure value of the preview image according to the first shooting parameter by:
- the EV is an exposure value
- the F is an aperture number
- the T is a shutter level
- I is a photosensitive level.
- the number of photosensitive stages is a minimum number of stages.
- the second shooting parameter further includes: a second aperture value and a second sensitivity
- the processor is configured to implement the execution of the instruction to maintain the exposure value to obtain the second shooting parameter by:
- Any one of the one or more parameter combinations is combined as the second shooting parameter.
- an embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, and when the computer program is executed by the processor, the following steps are taken:
- the photographing is performed using a second photographing parameter including a second shutter speed, wherein the second shutter speed is less than the first shutter speed.
- the second shooting parameter is acquired while maintaining the exposure value.
- the first shooting parameter further includes: a first aperture value and a first sensitivity
- the computer program is executed by the processor to implement the step of calculating an exposure value of the preview image according to the first shooting parameter by:
- the EV is an exposure value
- the F is an aperture number
- the T is a shutter level
- I is a photosensitive level.
- the number of photosensitive stages is a minimum number of stages.
- the second shooting parameter further includes: a second aperture value and a second sensitivity
- the exposure value is maintained by the following manner Steps of obtaining the second shooting parameter:
- Any one of the one or more parameter combinations is combined as the second shooting parameter.
- the embodiment of the invention provides a photographing apparatus and method, and the apparatus comprises: a first acquiring module and a photographing module.
- the first acquiring module acquires a first shooting parameter of the preview image; wherein the first shooting parameter includes a first shutter speed; the shooting module performs shooting with a second shooting parameter including a second shutter speed, wherein the second shutter speed is smaller than the first shutter speed speed.
- FIG. 1 is a schematic structural diagram of hardware of an optional mobile terminal embodying various embodiments of the present invention
- FIG. 2 is a schematic diagram of a wireless communication system of the mobile terminal shown in FIG. 1;
- FIG. 3 is a block diagram showing the composition of a photographing apparatus according to an embodiment of the present invention.
- FIG. 4 is a flowchart of a photographing method according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of a photographing method according to an embodiment of the present invention.
- FIG. 1 is a schematic diagram showing the hardware structure of a mobile terminal embodying various embodiments of the present invention.
- the mobile terminal 100 may include a wireless communication unit 110, an A/V (Audio/Video) input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, an interface unit 170, a controller 180, and a power supply unit 190. and many more.
- Figure 1 illustrates a mobile terminal having various components, but it should be understood that not all illustrated components are required to be implemented. More or fewer components can be implemented instead. The elements of the mobile terminal will be described in detail below.
- Wireless communication unit 110 typically includes one or more components that permit radio communication between mobile terminal 100 and a wireless communication system or network.
- the wireless communication unit may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless internet module 113, a short-range communication module 114, and a location information module 115.
- the broadcast receiving module 111 receives at least one of a broadcast signal and broadcast related information from an external broadcast management server via a broadcast channel.
- the broadcast channel can include at least one of a satellite channel and a terrestrial channel.
- the broadcast management server may be a server that generates and transmits at least one of a broadcast signal and broadcast related information or a server that receives at least one of a previously generated broadcast signal and broadcast related information and transmits it to the terminal.
- the broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and the like.
- the broadcast signal may further include a broadcast signal combined with a TV or radio broadcast signal.
- the broadcast associated information may also be provided via a mobile communication network, and in this case, the broadcast associated information may be received by the mobile communication module 112.
- the broadcast signal may exist in various forms, for example, it may exist in the form of Digital Multimedia Broadcasting (DMB) Electronic Program Guide (EPG), Digital Video Broadcasting Handheld (DVB-H) Electronic Service Guide (ESG), and the like.
- the broadcast receiving module 111 can receive a signal broadcast by using various types of broadcast systems.
- the broadcast receiving module 111 can use forward link media (MediaFLO) by using, for example, multimedia broadcast-terrestrial (DMB-T), digital multimedia broadcast-satellite (DMB-S), digital video broadcast-handheld (DVB-H)
- MediaFLO forward link media
- DMB-T multimedia broadcast-terrestrial
- DMB-S digital multimedia broadcast-satellite
- DVD-H digital video broadcast-handheld
- the digital broadcasting system of the @) data broadcasting system, the terrestrial digital broadcasting integrated service (ISDB-T), and the like receives digital broadcasting.
- the broadcast receiving module 111 can be constructed as various broadcast systems suitable for providing broadcast signals as well as the above-described digital broadcast system. At least one of the broadcast signal and the broadcast associated information received via the broadcast receiving module 111 may be stored in the memory 160 (or other type of storage medium).
- the mobile communication module 112 transmits a radio signal to a base station (eg, an access point, a Node B, etc.) At least one of an external terminal and a server, and a radio signal received therefrom, or the mobile communication module 112 transmits a radio signal to at least one of a base station (eg, an access point, a Node B, etc.), an external terminal, and a server Or the mobile communication module 112 receives a radio signal from at least one of a base station (e.g., an access point, a Node B, etc.), an external terminal, and a server.
- a base station e.g, an access point, a Node B, etc.
- a base station e.g., an access point, a Node B, etc.
- Such radio signals may include voice call signals, video call signals, or various types of data transmitted and received according to at least one of text and multimedia messages, or various types of transmissions according to at least one of text and multimedia messages. Data, or various types of data received according to at least one of text and multimedia messages.
- the wireless internet module 113 supports wireless internet access of the mobile terminal.
- the module can be internally or externally coupled to the terminal.
- the wireless Internet access technologies involved in the module may include WLAN (Wireless LAN) (Wi-Fi), Wibro (Wireless Broadband), Wimax (Worldwide Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), etc. .
- the short range communication module 114 is a module that is configured to support short range communication.
- Some examples of short-range communication technologies include BluetoothTM, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wide Band (UWB), ZigbeeTM, and the like.
- the location information module 115 is a module configured to check or acquire location information of the mobile terminal.
- a typical example of a location information module is GPS (Global Positioning System).
- GPS Global Positioning System
- the GPS module 115 calculates distance information and accurate time information from three or more satellites and applies triangulation to the calculated information to accurately calculate three-dimensional current position information based on longitude, latitude, and altitude.
- the method for calculating position and time information uses three satellites and corrects the calculated position and time information errors by using another satellite.
- the GPS module 115 is capable of calculating speed information by continuously calculating current position information in real time.
- the A/V input unit 120 is arranged to receive an audio or video signal.
- the A/V input unit 120 may include a camera 121 and a microphone 1220 that processes image data of still pictures or video obtained by the image capturing device in a video capturing mode or an image capturing mode.
- the processed image frame can be displayed on the display unit 151.
- the image frames processed by the camera 121 may be stored in the memory 160 (or other storage medium) or transmitted via the wireless communication unit 110, and two or more cameras 1210 may be provided according to the configuration of the mobile terminal.
- the microphone 122 can receive sound via a microphone in an operation mode such as a telephone call mode, a recording mode, a voice recognition mode, and the like. Frequency data), and can process such sounds into audio data.
- the processed audio (voice) data can be converted to a format output that can be transmitted to the mobile communication base station via the mobile communication module 112 in the case of a telephone call mode.
- the microphone 122 can implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated during the process of receiving and transmitting audio signals.
- the user input unit 130 may generate key input data according to a command input by the user to control various operations of the mobile terminal.
- the user input unit 130 allows the user to input various types of information, and may include a keyboard, a pot, a touch pad (eg, a touch sensitive component that detects changes in resistance, pressure, capacitance, etc. due to contact), a scroll wheel , rocker, etc.
- a touch screen can be formed.
- the sensing unit 140 detects the current state of the mobile terminal 100 (eg, the open or closed state of the mobile terminal 100), the location of the mobile terminal 100, the presence or absence of contact (ie, touch input) by the user with the mobile terminal 100, and the mobile terminal.
- the sensing unit 140 can sense whether the slide type phone is turned on or off.
- the sensing unit 140 can detect whether the power supply unit 190 provides power or whether the interface unit 170 is coupled to an external device.
- Sensing unit 140 may include proximity sensor 1410 which will be described below in connection with a touch screen.
- the interface unit 170 serves as an interface through which at least one external device can connect with the mobile terminal 100.
- the external device may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port configured to connect a device having an identification module, and an audio input/output. (I/O) port, video I/O port, headphone port, and more.
- the identification module may be stored to verify various information used by the user using the mobile terminal 100 and may include a User Identification Module (UIM), a Customer Identification Module (SIM), a Universal Customer Identity Module (USIM), and the like.
- the device having the identification module may take the form of a smart card, and thus the identification device may be connected to the mobile terminal 100 via a port or other connection device.
- the interface unit 170 may be arranged to receive input (eg, data information, power, etc.) from an external device and transmit the received input to one or more components within the mobile terminal 100 or may be configured to be at the mobile terminal and external device Transfer data between.
- the interface unit 170 may function as a path through which power is supplied from the base to the mobile terminal 100 or may be used as a transmission of various command signals allowing input from the base to the mobile terminal 100 The path to the terminal.
- Various command signals or power input from the base can be used as signals for identifying whether the mobile terminal is accurately mounted on the base.
- the output unit 150 is configured to provide an output signal (eg, an audio signal, a video signal, an alarm signal, a vibration signal, etc.) in at least one of visual, audio, and tactile.
- the output unit 150 may include a display unit 151, an audio output module 152, an alarm unit 153, and the like.
- the display unit 151 can display information processed in the mobile terminal 100. For example, when the mobile terminal 100 is in a phone call mode, the display unit 151 can display a user interface (UI) or a graphical user interface (GUI) related to a call or other communication (eg, text messaging, multimedia file download, etc.). When the mobile terminal 100 is in a video call mode or an image capturing mode, the display unit 151 may display at least one of a captured image and a received image, a UI or GUI showing a video or image and related functions, and the like.
- UI user interface
- GUI graphical user interface
- the display unit 151 can function as an input device and an output device.
- the display unit 151 may include at least one of a liquid crystal display (LCD), a thin film transistor LCD (TFT-LCD), an organic light emitting diode (OLED) display, a flexible display, a three-dimensional (3D) display, and the like.
- LCD liquid crystal display
- TFT-LCD thin film transistor LCD
- OLED organic light emitting diode
- a flexible display a three-dimensional (3D) display, and the like.
- 3D three-dimensional
- Some of these displays may be configured to be transparent to allow a user to view from the outside, which may be referred to as a transparent display, and a typical transparent display may be, for example, a TOLED (Transparent Organic Light Emitting Diode) display or the like.
- TOLED Transparent Organic Light Emitting Diode
- the mobile terminal 100 may include two or more display units (or other display devices), for example, the mobile terminal may include an external display unit (not shown) and an internal display unit (not shown) .
- the touch screen can be set to detect touch input pressure as well as touch input position and touch input area.
- the audio output module 152 may convert audio data received by the wireless communication unit 110 or stored in the memory 160 when the mobile terminal is in a call signal receiving mode, a call mode, a recording mode, a voice recognition mode, a broadcast receiving mode, and the like.
- the audio signal is output as sound.
- the audio output module 152 can provide audio output (eg, call signal reception sound, message reception sound, etc.) associated with a particular function performed by the mobile terminal 100.
- the audio output module 152 can include a speaker, a buzzer, and the like.
- the alarm unit 153 can provide an output to notify the mobile terminal 100 of the occurrence of an event. Typical events may include call reception, message reception, key signal input, touch input, and the like. In addition to audio or video output, the alert unit 153 can provide an output in a different manner to notify of the occurrence of an event. For example, the alarm unit 153 can provide an output in the form of vibrations, and when a call, message, or some other incoming communication is received, the alarm unit 153 can provide a tactile output (ie, vibration) to notify the user of it. By providing such a tactile output, the user is able to recognize the occurrence of various events even when the user's mobile phone is in the user's pocket. The alarm unit 153 can also provide an output of the notification event occurrence via the display unit 151 or the audio output module 152.
- the memory 160 may store a software program or the like for processing and control operations performed by the controller 180, or may temporarily store data (for example, a phone book, a message, a still image, a video, etc.) that has been output or is to be output. Moreover, the memory 160 can store data regarding vibrations and audio signals of various manners that are output when a touch is applied to the touch screen.
- the memory 160 may include at least one type of storage medium including a flash memory, a hard disk, a multimedia card, a card type memory (eg, SD or DX memory, etc.), a random access memory (RAM), a static random access memory ( SRAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), programmable read only memory (PROM), magnetic memory, magnetic disk, optical disk, and the like.
- the mobile terminal 100 can cooperate with a network storage device that performs a storage function of the memory 160 through a network connection.
- the controller 180 typically controls the overall operation of the mobile terminal. For example, the controller 180 performs the control and processing associated with voice calls, data communications, video calls, and the like. Additionally, the controller 180 can include a multimedia module 1810 that is configured to reproduce (or play back) multimedia data, and the multimedia module 1810 can be constructed within the controller 180 or can be configured to be separate from the controller 180. The controller 180 may perform a pattern recognition process to recognize a handwriting input or a picture drawing input performed on the touch screen as a character or an image.
- the power supply unit 190 receives external power or internal power under the control of the controller 180 and provides appropriate power required to operate the various components and components.
- the various embodiments described herein can be implemented in a computer readable medium using, for example, computer software, hardware, or any combination thereof.
- the embodiments described herein can Through the use of application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers
- controller the microprocessor
- implementations such as procedures or functions may be implemented with separate software modules that permit the execution of at least one function or operation.
- the software code can be implemented by a software application (or program) written in any suitable programming language, which
- the mobile terminal has been described in terms of its function.
- a slide type mobile terminal among various types of mobile terminals such as a folding type, a bar type, a swing type, a slide type mobile terminal, and the like will be described as an example. Therefore, the embodiment of the present invention can be applied to any type of mobile terminal, and is not limited to a slide type mobile terminal.
- the mobile terminal 100 as shown in FIG. 1 may be configured to operate using a communication system such as a wired and wireless communication system and a satellite-based communication system that transmits data via frames or packets.
- a communication system such as a wired and wireless communication system and a satellite-based communication system that transmits data via frames or packets.
- a communication system in which a mobile terminal is operable according to an embodiment of the present invention will now be described with reference to FIG.
- Such a communication system can use at least one of a different air interface and a physical layer.
- air interfaces used by communication systems include, for example, Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Universal Mobile Telecommunications System (UMTS) (in particular, Long Term Evolution (LTE)). ), Global System for Mobile Communications (GSM), etc.
- FDMA Frequency Division Multiple Access
- TDMA Time Division Multiple Access
- CDMA Code Division Multiple Access
- UMTS Universal Mobile Telecommunications System
- LTE Long Term Evolution
- GSM Global System for Mobile Communications
- the following description relates to a CDMA communication system, but such teachings are equally applicable to other types of systems.
- a CDMA wireless communication system can include a plurality of mobile terminals 100, a plurality of base stations (BS) 270, a base station controller (BSC) 275, and a mobile switching center (MSC) 280.
- the MSC 280 is configured to interface with a public switched telephone network (PSTN) 290.
- PSTN public switched telephone network
- the MSC 280 is also configured to interface with a BSC 275 that can be coupled to the base station 270 via a backhaul line.
- the backhaul line can be constructed in accordance with any of a number of well known interfaces including, for example, E1/T1, ATM, IP, PPP, Frame Relay, HDSL, ADSL, or xDSL. It will be appreciated that the system as shown in FIG. 2 may include multiple BSC 2750s.
- Each BS 270 can serve one or more partitions (or regions), by a multi-directional antenna or pointing to a specific Each of the sections covered by the directional antenna is radially away from the BS 270. Alternatively, each partition may be covered by two or more antennas that are set to receive diversity. Each BS 270 can be configured to support multiple frequency allocations, and each frequency allocation has a particular frequency spectrum (eg, 1.25 MHz, 5 MHz, etc.).
- BS 270 may also be referred to as a Base Transceiver Subsystem (BTS) or other equivalent terminology.
- BTS Base Transceiver Subsystem
- the term "base station” can be used to generally refer to a single BSC 275 and at least one BS 270.
- a base station can also be referred to as a "cell station.”
- each partition of a particular BS 270 may be referred to as a plurality of cellular stations.
- a broadcast transmitter (BT) 295 transmits a broadcast signal to the mobile terminal 100 operating within the system.
- a broadcast receiving module 111 as shown in FIG. 1 is provided at the mobile terminal 100 to receive a broadcast signal transmitted by the BT 295.
- GPS Global Positioning System
- the satellite 300 helps locate at least one of the plurality of mobile terminals 100.
- a plurality of satellites 300 are depicted, but it is understood that useful positioning information can be obtained using any number of satellites.
- the GPS module 115 as shown in Figure 1 is typically configured to cooperate with the satellite 300 to obtain desired positioning information. Instead of GPS tracking technology or in addition to GPS tracking technology, other techniques that can track the location of the mobile terminal can be used. Additionally, at least one GPS satellite 300 can selectively or additionally process satellite DMB transmissions.
- BS 270 receives reverse link signals from various mobile terminals 100.
- Mobile terminal 100 typically participates in calls, messaging, and other types of communications.
- Each reverse link signal received by a particular base station 270 is processed within a particular BS 270.
- the obtained data is forwarded to the relevant BSC 275.
- the BSC provides call resource allocation and coordinated mobility management functions including a soft handoff procedure between the BSs 270.
- the BSC 275 also routes the received data to the MSC 280, which provides additional routing services for interfacing with the PSTN 290.
- PSTN 290 interfaces with MSC 280, which forms an interface with BSC 275, and BSC 275 controls BS 270 accordingly to transmit forward link signals to mobile terminal 100.
- the data of the preview image and the final shooting data will use the same exposure parameters to achieve the same effect as seen.
- the exposure parameter of each preview frame is the sensitivity ISO400
- the exposure time is 1/100 second
- the shooting is performed, and finally the photo with the same parameters is generated.
- the effect of the photos taken and the preview images is basically the same.
- this process will have problems for long exposures. For example, if the current environment requires 8S to achieve a reasonable exposure time, then from the preview point of view, every 8S will refresh the interface, this long delay is waiting for shooting. The user will be a very bad user experience.
- the embodiment of the invention is based on three aspects closely related to the exposure effect of the picture: aperture, exposure time and ISO, and proposes a shooting method in which the shooting parameters of the preview image are different from the actual shooting parameters, that is, when obtaining the preview image, Improve the user experience, priority to ensure that the exposure time of the screen is short enough, in order to ensure that the last photograph taken has sufficient exposure value when capturing the final photograph, by aperture or ISO during shooting, or both The value is compensated, which also ensures the effect on the picture effect due to the shorter exposure time during actual shooting.
- an embodiment of the present invention provides a camera device 1, which includes a first acquisition module 01, a calculation module 02, a second acquisition module 03, and a capture module 04.
- the first obtaining module 01 is configured to acquire a first shooting parameter of the preview image; wherein the first shooting parameter comprises a first shutter speed.
- the user can know the picture effect of the photo to be taken by the preview image before taking the photo to determine whether to continue shooting.
- the preview image may be generated at the first shutter speed.
- the first shutter speed refers to a shutter start speed with a shutter start time of t1, and the time of the first shutter speed needs to be short enough to not bring a preview experience such as pause, delay or waiting for the user.
- Common shutter speed standards are: 1/1000 second, 1/500 second, 1/250 second, 1/125 second, 1/60 second, 1/30 second, 1/15 second, 1/8 second, 1/ 4 seconds, 1/2 second, and 1 second. Therefore, in order to achieve the foregoing objective, t1 ⁇ 1/4s may be selected.
- the first shutter speed may be set to a different value according to different application scenarios or different shooting habits of different users. The specific numerical value of the first shutter speed is not limited in the embodiment of the present invention.
- the calculation module 02 is configured to calculate an exposure value of the preview image according to the first shooting parameter before the shooting module 04 performs shooting.
- the user may determine a final preview image according to different screen images of the preview image, and take the final preview image as a standard.
- Shooting Since the main factor affecting the effect of the image picture is the exposure value, in order to make the picture effect of the actually taken photo consistent with the finalized preview image, it is necessary to ensure that the exposure is the same or similar to the preview image when the shooting is performed.
- the value is similar to the difference value of the exposure value is less than or equal to the preset difference threshold.
- the specific value of the difference threshold can be defined according to different application scenarios, such as according to the difference in the quality requirements of the photo. Here, a case where the exposure values are completely the same will be described as an example.
- the first shooting parameter is described in detail because the exposure value is calculated based on the first shooting parameter.
- the first shooting parameter further includes: a first aperture value and a first sensitivity.
- the photographing parameters of a photograph may include aperture, exposure time, and ISO information, and the information is three aspects closely related to the exposure effect of the screen.
- the aperture also called the focus ratio
- the aperture is the part of the camera that controls the aperture size of the lens to control the depth of field, the quality of the lens image, and the amount of light that is coordinated with the shutter.
- the expression aperture size is represented by the f value.
- the f-number of the aperture the focal length of the lens / the aperture of the aperture. The effect of the aperture on the photo: the larger the aperture, the larger the amount of light, the smaller the depth of field, the smaller the f-value.
- the complete range of aperture values are as follows: f1.0, f1.4, f2.0, f2.8, f4.0, f5.6, f8.0, f11, f16, f22, f32, f45, and f64. It is worth mentioning here that the smaller the aperture f value is, the larger the aperture is, the more the amount of light entering the same unit time, and the amount of light entering the upper level is exactly twice that of the next level, for example, the aperture is from f8. Adjusted to f5.6, the amount of light is doubled, we also said that the aperture opened up one level. The amount of light passing through f5.6 is twice that of f8.
- f2 is 16 times the f8 luminous flux, adjusted from f8 to f2, and the aperture is opened to four levels.
- the aperture f value is often between f2.8-f11.
- many digital cameras can make 1/3-level adjustments when adjusting the aperture. The smaller the value after f, the larger the aperture.
- the role of the aperture is to determine the mirror The amount of light entering the head, the larger the aperture, the more the amount of light entering; otherwise, the smaller. To put it simply, in the case where the shutter speed (or the exposure speed is inversely proportional to the exposure time), the smaller the aperture f value is, the larger the aperture is. The more the amount of light entering, the brighter the picture; the larger the aperture f is. The smaller the picture, the darker the picture.
- the exposure time is controlled by the shutter speed, which indicates the time the shutter stays open while the camera is shooting.
- the shorter the time the shorter the exposure time, and the longer the time, the longer the exposure time.
- the shutter speed represents the length of time in seconds or fractions of a second. Different camera manufacturers' fuselage will have different shutter speed starting ranges, and this range is also important. All single-lens reflex cameras have at least the following shutter speeds (maybe more): 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, and 1/1000 second. Through this series of shutter speeds, it is found that each shutter speed is half of the previous speed, but twice the latter. For example, 1/125 second is half of 1/60 second, but twice the 1/250 second.
- the shutter position of a Nikon camera includes: 1/8, 1/10, 1/13, 1/15, 1/20, 1/25, 1/30, 1/40, 1/50, and 1/ 60 seconds and so on. From 1/30 to 1/60 seconds is the first gear, and the same, from 1/20 to 1/40 and from 1/13 to 1/25 is also a gear.
- the shutter speed it also changes the way the moving object is recorded on the film. The faster the shutter speed, the sharper the moving object will appear on the film. Conversely, the slower the shutter speed, the more blurred the image of the moving object on the film.
- the shutter speed and the aperture size of the lens together determine the amount of light that reaches the film or sensor.
- the exposure is measured by the exposure value (EV value), which represents a half or double exposure.
- EV value exposure value
- the shutter speed of 1/250 second and the aperture size of f/8, 1/500 second and f/5.6, 1/125 second and f/11 Equal exposure combinations can achieve the same exposure value.
- the ISO is an index similar to film sensitivity.
- the ISO of a digital camera is achieved by adjusting the sensitivity of the photosensitive device or combining the photosensitive dots, that is, by increasing the light sensitivity of the photosensitive device or combining several Adjacent photosensitive points to achieve the purpose of improving ISO.
- the photosensitive device has a reaction capability, and the reaction capability is fixed.
- the ISO of the digital camera is improved in two ways: 1. Forcibly increase the brightness and contrast of each pixel; 2. Use multiple pixels. Work together to accomplish the task of just one pixel point. It can be seen that the loss of image quality after the digital camera is upgraded is very large. Especially when the area of the photosensitive device is small, the improvement of ISO is fatal to the picture quality. Therefore, generally, in the case where the quality of the camera's photosensitive device is not allowed, in order to ensure the image quality, the original ISO setting value will be maintained as much as possible, and the ISO will not be adjusted.
- the calculating module 02 is configured to calculate an exposure value of the preview image according to the first shooting parameter, including steps 101-102:
- the aperture value, the shutter speed, and the ISO are important for the exposure effect of the photo. Therefore, it is necessary to first obtain the first shutter speed and the first aperture from the first shooting parameter of the preview image. Value and first sensitivity.
- an exposure value is that the exposure value is a logarithmic scale system with a base of 2, Where f is the aperture value; t is the exposure time (in inverse proportion to the shutter speed) in seconds. Therefore, the calculation of the exposure value by the calculation module 02 can obtain the current exposure value on the basis of obtaining the first aperture value f and the first shutter speed 1/t by the above calculation formula.
- the exposure value is defined as follows: when the sensitivity is ISO 100, the aperture coefficient is F1, and the exposure time is 1 second, the exposure amount is defined as 0, and the exposure amount is decreased by one step (the shutter speed is reduced by half or the aperture is reduced).
- the EV value increases by one.
- the exposure value represents all camera aperture shutter combinations that give the same exposure.
- the aperture f/2.8, the EV value of the shutter 1/15 second is larger than the aperture f/8, and the EV value of the shutter 1/60 second.
- the calculation of the exposure value by the calculation module 02 can also be performed through a preset exposure value mapping table. The calculation scheme of the exposure table will be described in detail below.
- the preset exposure value mapping table may include various implementable shutter speeds, aperture values, and ISOs of the photographing terminal, and different shutter levels are set for different shutter speeds, and different shutter levels may be used. Corresponds to different shutter levels. Similarly, the preset exposure value mapping table also sets different aperture levels for different aperture values, different aperture levels correspond to different aperture levels; and different sensitivity levels are set for different ISOs, different The sensitivity level will correspond to different levels of sensitivity.
- Table 1 An embodiment of the preset exposure value mapping table is shown in Table 1. It should be noted that the following table only lists and parts. As the shutter speed, aperture value and ISO gradually increase or decrease, the corresponding shutter level, aperture level and photosensitive level will also increase accordingly. 1 or minus 1, not listed here.
- Shutter speed 1 1/2 1/4 1/8 1/15 1/30 1/60 1/125 1/250 1/500 1/1000 Shutter level T 0 1 2 3 4 5 6 7 8 9 10
- the corresponding level of the parameter may be obtained according to the exposure value mapping table, that is, Table 1. That is, the first shutter level, the first aperture number, and the first photosensitive level. For example, suppose the first shutter speed is 1/250 s, the first aperture value is f8, and the first sensitivity is 200; the first shutter level is 8, the first aperture number is 6, and the first photosensitive level is 1. .
- preset exposure value mapping table may be set to different forms according to different application scenarios or application habits, and is not limited to Table 1 above.
- the ISO is generally limited by the quality of the photosensitive device, if the photosensitive device is of poor quality, the image quality is affected when the ISO adjustment is performed. Therefore, it is possible to maintain the basis of ISO.
- Only the mapping table of shutter speed and aperture value is set, and the exposure value corresponding to different shutter speed and aperture value can be directly compared in the mapping table.
- this table is a map of the shutter speed, the aperture value, and the exposure value set with reference to ISO100. As long as the exposure value obtained under ISO100 can be selected according to the table, different shutter speeds and aperture values can be combined under the same exposure value.
- EV is the exposure value
- F is the aperture number
- T is the shutter level
- I is the number of light levels.
- the table 1 is taken as an example to describe how to calculate the exposure value according to the first shutter level, the first aperture number, and the first photosensitive level.
- an exposure value calculation formula that is, the above-described first calculation formula is also set, by which the obtained first shutter level, the first aperture number, and the first photosensitive level are performed.
- the addition is the exposure value corresponding to the first shooting parameter.
- the exposure value of the first shooting parameter calculated according to the embodiment of Table 1 is 15.
- the number of photosensitive stages is a minimum number of levels.
- Table 2 takes Table 2 as an example to explain how to obtain the exposure value corresponding to the first shooting parameter. It can be seen from Table 2 that when the first shutter speed is 1/250 s and the first aperture value is f8, the corresponding EV value in Table 2 is 14, since the embodiment of Table 2 is based on ISO 100, therefore, the calculated The corresponding number of ISOs or the corresponding EV value is not added to the EV value.
- the ISO photosensitive level map as shown in Table 1 or the ISO EV value comparison table that is, ISO When it is 100, the EV value is +0; when the ISO is 200, the EV value is +1; when the ISO is 400, the EV value is +2; when the ISO is 800, the EV value is +3; when the ISO is 1600, the EV value is 1600. +4; When the ISO is 3200, the EV value is +5; when the ISO is 6400, the EV value is +6.
- the exposure value corresponding to the first shooting parameter in the preview image can be calculated.
- the second acquisition module 03 is configured to maintain the exposure value unchanged to obtain the second shooting parameter having the second shutter speed.
- the image after calculating the exposure value of the preview image by the calculation module 02, in order to obtain the same image quality as the preview image and prolonging the exposure time, the image may be reduced while maintaining the calculated exposure value.
- a small shutter speed to obtain a second shooting parameter For example, the first shutter speed is converted to a second shutter speed.
- the second shutter speed refers to a shutter starting speed with a shutter starting time of t2; t2 ⁇ 1/4s.
- the second shutter speed is slower than the first shutter speed, and when the shutter speed is lowered, the exposure time at the time of shooting is increased, thereby increasing the exposure amount. Therefore, in order to obtain the same image quality as the preview image, the shutter speed can be compensated by adjusting at least one of the aperture value and the ISO to keep the exposure value unchanged.
- the second shooting parameter further includes: a second aperture value and a second sensitivity.
- the calculation module 02 after calculating the exposure value of the preview image by the calculation module 02, if it is desired to keep the exposure value unchanged after the shutter speed is decreased to the second shutter speed, it is necessary to obtain A second aperture value and a second sensitivity corresponding to the second shutter speed are taken. Specifically, the second aperture value and the second sensitivity are acquired by the second acquisition module 03 described below.
- the second acquisition module 03 is configured to maintain the exposure value unchanged to obtain the second shooting parameter having the second shutter speed, including steps 201-204:
- the above Table 1 and Table 2 are also taken as an example.
- the shutter speed is reduced from the first shutter speed 1/250 s at the time of original preview to the second shutter speed 1 second at the time of shooting.
- Table 1 it can be seen that the second shutter speed corresponding to the second shutter speed is zero. If the second shutter speed is larger, 2 seconds, 4 seconds, 8 seconds, etc., the second shutter level is gradually decreased by one. For example, when the second shutter speed is 2 seconds, the second shutter level is -1; when the second shutter speed is 8 seconds, the second shutter level is -3. Other door opening speed values and so on, will not be described here.
- the exposure value and the second shutter level are known, and the sum of the second aperture number and the second photosensitive level can be obtained by the first calculation formula described above.
- the ISO value, the aperture value, and the second shutter speed described above are taken together as the second shooting parameter at the time of actual shooting.
- the photographing module 04 is configured to photograph with a second photographing parameter including a second shutter speed, wherein the second shutter speed is less than the first shutter speed.
- the actual shooting may be performed according to the second shooting parameter, and the photograph obtained by the shooting has the same exposure value as the preview image, and therefore, the photograph taken. Has basically the same picture effect as the preview image.
- the embodiment of the present invention further provides a shooting method, as shown in FIG. 4 and FIG. 5, it should be noted that any of the foregoing device embodiments is also applicable to the method embodiment of the present invention. Let me repeat.
- the method includes steps 301-302:
- the preview image may be generated at the first shutter speed.
- the method further includes:
- the exposure value of the preview image is calculated based on the first shooting parameter before the shooting is performed.
- the second shooting parameter is obtained while keeping the exposure value unchanged.
- the first shutter speed refers to a shutter start speed at which the shutter start time is t1; t1 ⁇ 1/4s.
- the second shutter speed refers to the shutter start speed at which the shutter start time is t2; t2 ⁇ 1/4 s.
- the first shooting parameter further includes: a first aperture value and a first sensitivity.
- Calculating the exposure value of the preview image according to the first shooting parameter includes:
- EV is the exposure value
- F is the aperture number
- T is the shutter level
- I is the number of light levels.
- the number of photosensitive stages is a minimum number of levels.
- the second shooting parameter further includes: a second aperture value and a second sensitivity.
- Keeping the exposure value unchanged to obtain the second shooting parameters includes:
- the sum of the second number of steps and the second number of light levels is obtained according to the first calculation formula and the second shutter level.
- a combination of one or more parameter combinations is used as the second shooting parameter.
- the embodiment of the invention provides a photographing apparatus and method, and the apparatus comprises: a first acquiring module and a photographing module.
- the first acquiring module acquires a first shooting parameter of the preview image; wherein the first shooting parameter includes a first shutter speed; the shooting module performs shooting with a second shooting parameter including a second shutter speed, wherein the second shutter speed is smaller than the first shutter speed speed.
- the embodiment of the invention further provides a mobile terminal, including:
- Memory set to store instructions
- the processor configured to execute the instructions, implements the following shooting steps:
- the photographing is performed using a second photographing parameter including a second shutter speed, wherein the second shutter speed is less than the first shutter speed.
- the processor is further configured to execute the instruction to implement the following shooting steps:
- the second shooting parameter is acquired while maintaining the exposure value.
- the first shooting parameter further includes: a first aperture value and a first sensitivity
- the processor is configured to implement an execution instruction to calculate an exposure value of the preview image according to the first shooting parameter by:
- the EV is an exposure value
- the F is an aperture number
- the T is a shutter level
- I is a photosensitive level.
- the number of photosensitive stages is a minimum number of stages.
- the second shooting parameter further includes: a second aperture value and a second sensitivity
- the processor is configured to implement the execution of the instruction to maintain the exposure value to obtain the second shooting parameter by:
- Any one of the one or more parameter combinations is combined as the second shooting parameter.
- the memory may be the memory 160 of the mobile terminal of FIG. 1; the processor may be disposed in the controller 180 of the mobile terminal of FIG.
- the embodiment of the invention further provides a computer readable storage medium, on which a computer program is stored, and when the computer program is executed by the processor, the following steps are taken:
- the photographing is performed using a second photographing parameter including a second shutter speed, wherein the second shutter speed is less than the first shutter speed.
- the second shooting parameter is acquired while maintaining the exposure value.
- the first shooting parameter further includes: a first aperture value and a first sensitivity
- the computer program is executed by the processor to implement the step of calculating an exposure value of the preview image according to the first shooting parameter by:
- the EV is an exposure value
- the F is an aperture number
- the T is a shutter level
- I is a photosensitive level.
- the number of photosensitive stages is a minimum number of stages.
- the second shooting parameter further includes: a second aperture value and a second sensitivity
- the step of maintaining the exposure value to obtain the second shooting parameter is implemented by:
- Any one of the one or more parameter combinations is combined as the second shooting parameter.
- Computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules, or other data. , removable and non-removable media.
- Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridge, magnetic tape, magnetic disk storage or other magnetic storage device, or may Any other medium used to store the desired information and that can be accessed by the computer.
- communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media.
- a modulated data signal such as a carrier wave or other transport mechanism
- the embodiment of the invention improves the preview experience of the user, and ensures that the preview image is consistent with the picture effect of taking the photo.
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Abstract
一种拍摄装置和方法,该装置包括:第一获取模块和拍摄模块。第一获取模块设置为获取预览图像的第一拍摄参数;其中第一拍摄参数包括第一快门速度;拍摄模块设置为采用包括第二快门速度的第二拍摄参数进行拍摄,其中,第二快门速度小于第一快门速度。
Description
本文涉及但不限于拍摄技术领域,尤其涉及一种拍摄装置和方法。
目前,在具有拍摄功能的终端进行拍摄时,预览图像的数据及最终的拍摄数据会采用相同的曝光参数,以实现所见与所得效果一致的目的。例如,在相机预览时,每一预览帧的曝光参数为感光度ISO400、曝光时间为1/100秒(S),然后进行拍摄,最后生成同样参数的照片,这样拍摄的照片和预览图像的效果是基本一致的。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提出一种拍摄装置和方法,能够提高用户的预览体验,并且保障预览图像与拍摄照片的画面效果保持一致。
本发明实施例提供了一种拍摄装置,该装置包括:第一获取模块和拍摄模块;
第一获取模块,设置为获取预览图像的第一拍摄参数;其中第一拍摄参数包括第一快门速度;
拍摄模块,设置为采用包括第二快门速度的第二拍摄参数进行拍摄,其中,第二快门速度小于第一快门速度。
可选地,该装置还包括计算模块和第二获取模块;
计算模块,设置为在拍摄模块进行拍摄之前根据第一拍摄参数计算预览图像的曝光值;
第二获取模块,设置为保持该曝光值不变获取第二拍摄参数。
可选地,
第一快门速度是指快门启动时间为t1的快门启动速度;t1<1/4s;
第二快门速度是指快门启动时间为t2的快门启动速度;t2≥1/4s。
可选地,第一拍摄参数还包括:第一光圈值和第一感光度;
计算模块设置为通过如下方式实现根据第一拍摄参数计算预览图像的曝光值:
根据预设的曝光值映射表获取第一快门速度对应的第一快门级数、第一光圈值对应的第一光圈级数以及第一感光度对应的第一感光级数;
将第一快门级数、第一光圈级数和第一感光级数代入以下第一计算式计算所述曝光值:
EV=F+T+I;
其中,EV为曝光值,F为光圈级数,T为快门级数,I为感光级数。
可选地,感光级数为最小级数。
可选地,第二拍摄参数还包括:第二光圈值和第二感光度;
第二获取模块设置为通过如下方式实现保持曝光值不变获取第二拍摄参数:
根据预设的曝光值映射表获取第二快门速度对应的第二快门级数;
根据第一计算式和第二快门级数获取第二光圈级数与第二感光级数之和;
根据预设的曝光值映射表以及第二光圈级数与第二感光级数之和获取第二光圈值和第二感光度的一个或多个参数组合;
将一个或多个参数组合中的任意一个参数组合作为第二拍摄参数。
此外,本发明实施例还提供了一种拍摄方法,该方法包括:
获取预览图像的第一拍摄参数;其中第一拍摄参数包括第一快门速度;
采用包括第二快门速度的第二拍摄参数进行拍摄,其中,第二快门速
度小于第一快门速度。
可选地,该方法还包括:
在进行拍摄之前根据第一拍摄参数计算预览图像的曝光值;
保持该曝光值不变获取第二拍摄参数。
可选地,
第一快门速度是指快门启动时间为t1的快门启动速度;t1<1/4s;
第二快门速度是指快门启动时间为t2的快门启动速度;t2≥1/4s。
可选地,第一拍摄参数还包括:第一光圈值和第一感光度;
根据第一拍摄参数计算预览图像的曝光值包括:
根据预设的曝光值映射表获取第一快门速度对应的第一快门级数、第一光圈值对应的第一光圈级数以及第一感光度对应的第一感光级数;
将第一快门级数、第一光圈级数和第一感光级数代入以下第一计算式计算曝光值:
EV=F+T+I;
其中,EV为曝光值,F为光圈级数,T为快门级数,I为感光级数。
可选地,感光级数为最小级数。
可选地,第二拍摄参数还包括:第二光圈值和第二感光度;
保持曝光值不变获取第二拍摄参数包括:
根据预设的曝光值映射表获取第二快门速度对应的第二快门级数;
根据第一计算式和第二快门级数获取第二光圈级数与第二感光级数之和;
根据预设的曝光值映射表以及第二光圈级数与第二感光级数之和获取第二光圈值和第二感光度的一个或多个参数组合;
将一个或多个参数组合中的任意一个参数组合作为第二拍摄参数。
此外,本发明实施例还提供了一种移动终端,包括:
存储器,设置为存储指令;
处理器,设置为执行所述指令,实现如下的拍摄步骤:
获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;
采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
可选的,所述处理器还设置为执行所述指令,实现如下的拍摄步骤:
在进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;
保持所述曝光值不变获取所述第二拍摄参数。
可选的,所述第一拍摄参数还包括:第一光圈值和第一感光度;
所述处理器,是设置为通过如下方式实现执行指令实现根据所述第一拍摄参数计算所述预览图像的曝光值的步骤:
根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;
将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:
EV=F+T+I;
其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
可选的,所述感光级数为最小级数。
可选的,所述第二拍摄参数还包括:第二光圈值和第二感光度;
所述处理器,是设置为通过如下方式实现执行指令实现保持所述曝光值不变获取所述第二拍摄参数的步骤:
根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;
根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;
根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;
将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
此外,本发明实施例还提供了一种计算机可读存储介质,其上存储有计算机程序,所述计算机程序被处理器执行时实现下述拍摄的步骤:
获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;
采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
可选的,所述计算机程序被处理器执行时还实现下述拍摄的步骤:
在进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;
保持所述曝光值不变获取所述第二拍摄参数。
可选的,所述第一拍摄参数还包括:第一光圈值和第一感光度;
所述计算机程序被处理器执行时通过如下方式实现根据所述第一拍摄参数计算所述预览图像的曝光值的步骤:
根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;
将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:
EV=F+T+I;
其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
可选的,所述感光级数为最小级数。
可选的,所述第二拍摄参数还包括:第二光圈值和第二感光度;
所述计算机程序被处理器执行时通过如下方式实现保持所述曝光值不
变获取所述第二拍摄参数的步骤:
根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;
根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;
根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;
将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
本发明实施例提出了一种拍摄装置和方法,该装置包括:第一获取模块和拍摄模块。第一获取模块获取预览图像的第一拍摄参数;其中第一拍摄参数包括第一快门速度;拍摄模块采用包括第二快门速度的第二拍摄参数进行拍摄,其中,第二快门速度小于第一快门速度。通过本发明实施例的方案,能够提高用户的预览体验,并且保障预览图像与拍摄照片的画面效果保持一致。
在阅读并理解了附图和详细描述后,可以明白其他方面。
附图概述
图1为实现本发明各个实施例一个可选的移动终端的硬件结构示意图;
图2为如图1所示的移动终端的无线通信系统示意图;
图3为本发明实施例的拍摄装置组成框图;
图4为本发明实施例的拍摄方法流程图;
图5为本发明实施例的拍摄方法示意图。
图1为实现本发明各个实施例的移动终端的硬件结构示意。
移动终端100可以包括无线通信单元110、A/V(音频/视频)输入单元120、用户输入单元130、感测单元140、输出单元150、存储器160、接口单元170、控制器180和电源单元190等等。图1示出了具有各种组件的移动终端,但是应理解的是,并不要求实施所有示出的组件。可以替代地实施更多或更少的组件。将在下面详细描述移动终端的元件。
无线通信单元110通常包括一个或多个组件,其允许移动终端100与无线通信系统或网络之间的无线电通信。例如,无线通信单元可以包括广播接收模块111、移动通信模块112、无线互联网模块113、短程通信模块114和位置信息模块115中的至少一个。
广播接收模块111经由广播信道从外部广播管理服务器接收广播信号和广播相关信息中至少一种。广播信道可以包括卫星信道和地面信道中至少一种。广播管理服务器可以是生成并发送广播信号和广播相关信息中至少一种的服务器或者接收之前生成的广播信号和广播相关信息中至少一种并且将其发送给终端的服务器。广播信号可以包括TV广播信号、无线电广播信号、数据广播信号等等。而且,广播信号可以进一步包括与TV或无线电广播信号组合的广播信号。广播相关信息也可以经由移动通信网络提供,并且在该情况下,广播相关信息可以由移动通信模块112来接收。广播信号可以以各种形式存在,例如,其可以以数字多媒体广播(DMB)的电子节目指南(EPG)、数字视频广播手持(DVB-H)的电子服务指南(ESG)等等的形式而存在。广播接收模块111可以通过使用各种类型的广播系统接收信号广播。特别地,广播接收模块111可以通过使用诸如多媒体广播-地面(DMB-T)、数字多媒体广播-卫星(DMB-S)、数字视频广播-手持(DVB-H),前向链路媒体(MediaFLO@)的数据广播系统、地面数字广播综合服务(ISDB-T)等等的数字广播系统接收数字广播。广播接收模块111可以被构造为适合提供广播信号的各种广播系统以及上述数字广播系统。经由广播接收模块111接收的广播信号和广播相关信息中至少一种可以存储在存储器160(或者其它类型的存储介质)中。
移动通信模块112将无线电信号发送到基站(例如,接入点、节点B等
等)、外部终端以及服务器中的至少一个以及从其接收无线电信号,或者移动通信模块112将无线电信号发送到基站(例如,接入点、节点B等等)、外部终端以及服务器中的至少一个,或者移动通信模块112从基站(例如,接入点、节点B等等)、外部终端以及服务器中的至少一个接收无线电信号。这样的无线电信号可以包括语音通话信号、视频通话信号、或者根据文本和多媒体消息中至少一种发送和接收的各种类型的数据,或者根据文本和多媒体消息中至少一种发送的各种类型的数据,或者根据文本和多媒体消息中至少一种接收的各种类型的数据。
无线互联网模块113支持移动终端的无线互联网接入。该模块可以内部或外部地耦接到终端。该模块所涉及的无线互联网接入技术可以包括WLAN(无线LAN)(Wi-Fi)、Wibro(无线宽带)、Wimax(全球微波互联接入)、HSDPA(高速下行链路分组接入)等等。
短程通信模块114是设置为支持短程通信的模块。短程通信技术的一些示例包括蓝牙TM、射频识别(RFID)、红外数据协会(IrDA)、超宽带(UWB)、紫蜂TM等等。
位置信息模块115是设置为检查或获取移动终端的位置信息的模块。位置信息模块的典型示例是GPS(全球定位系统)。根据当前的技术,GPS模块115计算来自三个或更多卫星的距离信息和准确的时间信息并且对于计算的信息应用三角测量法,从而根据经度、纬度和高度准确地计算三维当前位置信息。当前,用于计算位置和时间信息的方法使用三颗卫星并且通过使用另外的一颗卫星校正计算出的位置和时间信息的误差。此外,GPS模块115能够通过实时地连续计算当前位置信息来计算速度信息。
A/V输入单元120设置为接收音频或视频信号。A/V输入单元120可以包括相机121和麦克风1220,相机121对在视频捕获模式或图像捕获模式中由图像捕获装置获得的静态图片或视频的图像数据进行处理。处理后的图像帧可以显示在显示单元151上。经相机121处理后的图像帧可以存储在存储器160(或其它存储介质)中或者经由无线通信单元110进行发送,可以根据移动终端的构造提供两个或更多相机1210。麦克风122可以在电话通话模式、记录模式、语音识别模式等等运行模式中经由麦克风接收声音(音
频数据),并且能够将这样的声音处理为音频数据。处理后的音频(语音)数据可以在电话通话模式的情况下转换为可经由移动通信模块112发送到移动通信基站的格式输出。麦克风122可以实施各种类型的噪声消除(或抑制)算法以消除(或抑制)在接收和发送音频信号的过程中产生的噪声或者干扰。
用户输入单元130可以根据用户输入的命令生成键输入数据以控制移动终端的各种操作。用户输入单元130允许用户输入各种类型的信息,并且可以包括键盘、锅仔片、触摸板(例如,检测由于被接触而导致的电阻、压力、电容等等的变化的触敏组件)、滚轮、摇杆等等。特别地,当触摸板以层的形式叠加在显示单元151上时,可以形成触摸屏。
感测单元140检测移动终端100的当前状态,(例如,移动终端100的打开或关闭状态)、移动终端100的位置、用户对于移动终端100的接触(即,触摸输入)的有无、移动终端100的取向、移动终端100的加速或减速移动和方向等等,并且生成用于控制移动终端100的操作的命令或信号。例如,当移动终端100实施为滑动型移动电话时,感测单元140可以感测该滑动型电话是打开还是关闭。另外,感测单元140能够检测电源单元190是否提供电力或者接口单元170是否与外部装置耦接。感测单元140可以包括接近传感器1410将在下面结合触摸屏来对此进行描述。
接口单元170用作至少一个外部装置与移动终端100连接可以通过的接口。例如,外部装置可以包括有线或无线头戴式耳机端口、外部电源(或电池充电器)端口、有线或无线数据端口、存储卡端口、设置为连接具有识别模块的装置的端口、音频输入/输出(I/O)端口、视频I/O端口、耳机端口等等。识别模块可以是存储用于验证用户使用移动终端100的各种信息并且可以包括用户识别模块(UIM)、客户识别模块(SIM)、通用客户识别模块(USIM)等等。另外,具有识别模块的装置(下面称为"识别装置")可以采取智能卡的形式,因此,识别装置可以经由端口或其它连接装置与移动终端100连接。接口单元170可以设置为接收来自外部装置的输入(例如,数据信息、电力等等)并且将接收到的输入传输到移动终端100内的一个或多个元件或者可以设置为在移动终端和外部装置之间传输数据。
另外,当移动终端100与外部底座连接时,接口单元170可以用作允许通过其将电力从底座提供到移动终端100的路径或者可以用作允许从底座输入的各种命令信号通过其传输到移动终端的路径。从底座输入的各种命令信号或电力可以用作用于识别移动终端是否准确地安装在底座上的信号。输出单元150被构造为以视觉、音频和触觉中至少一种方式提供输出信号(例如,音频信号、视频信号、警报信号、振动信号等等)。输出单元150可以包括显示单元151、音频输出模块152、警报单元153等等。
显示单元151可以显示在移动终端100中处理的信息。例如,当移动终端100处于电话通话模式时,显示单元151可以显示与通话或其它通信(例如,文本消息收发、多媒体文件下载等等)相关的用户界面(UI)或图形用户界面(GUI)。当移动终端100处于视频通话模式或者图像捕获模式时,显示单元151可以显示捕获的图像和接收的图像中至少一种、示出视频或图像以及相关功能的UI或GUI等等。
同时,当显示单元151和触摸板以层的形式彼此叠加以形成触摸屏时,显示单元151可以用作输入装置和输出装置。显示单元151可以包括液晶显示器(LCD)、薄膜晶体管LCD(TFT-LCD)、有机发光二极管(OLED)显示器、柔性显示器、三维(3D)显示器等等中的至少一种。这些显示器中的一些可以被构造为透明状以允许用户从外部观看,这可以称为透明显示器,典型的透明显示器可以例如为TOLED(透明有机发光二极管)显示器等等。根据特定想要的实施方式,移动终端100可以包括两个或更多显示单元(或其它显示装置),例如,移动终端可以包括外部显示单元(未示出)和内部显示单元(未示出)。触摸屏可设置为检测触摸输入压力以及触摸输入位置和触摸输入面积。
音频输出模块152可以在移动终端处于呼叫信号接收模式、通话模式、记录模式、语音识别模式、广播接收模式等等模式下时,将无线通信单元110接收的或者在存储器160中存储的音频数据转换音频信号并且输出为声音。而且,音频输出模块152可以提供与移动终端100执行的特定功能相关的音频输出(例如,呼叫信号接收声音、消息接收声音等等)。音频输出模块152可以包括扬声器、蜂鸣器等等。
警报单元153可以提供输出以将事件的发生通知给移动终端100。典型的事件可以包括呼叫接收、消息接收、键信号输入、触摸输入等等。除了音频或视频输出之外,警报单元153可以以不同的方式提供输出以通知事件的发生。例如,警报单元153可以以振动的形式提供输出,当接收到呼叫、消息或一些其它进入通信(incomingcommunication)时,警报单元153可以提供触觉输出(即,振动)以将其通知给用户。通过提供这样的触觉输出,即使在用户的移动电话处于用户的口袋中时,用户也能够识别出各种事件的发生。警报单元153也可以经由显示单元151或音频输出模块152提供通知事件的发生的输出。
存储器160可以存储由控制器180执行的处理和控制操作的软件程序等等,或者可以暂时地存储己经输出或将要输出的数据(例如,电话簿、消息、静态图像、视频等等)。而且,存储器160可以存储关于当触摸施加到触摸屏时输出的各种方式的振动和音频信号的数据。
存储器160可以包括至少一种类型的存储介质,所述存储介质包括闪存、硬盘、多媒体卡、卡型存储器(例如,SD或DX存储器等等)、随机访问存储器(RAM)、静态随机访问存储器(SRAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、可编程只读存储器(PROM)、磁性存储器、磁盘、光盘等等。而且,移动终端100可以与通过网络连接执行存储器160的存储功能的网络存储装置协作。
控制器180通常控制移动终端的总体操作。例如,控制器180执行与语音通话、数据通信、视频通话等等相关的控制和处理。另外,控制器180可以包括设置为再现(或回放)多媒体数据的多媒体模块1810,多媒体模块1810可以构造在控制器180内,或者可以构造为与控制器180分离。控制器180可以执行模式识别处理,以将在触摸屏上执行的手写输入或者图片绘制输入识别为字符或图像。
电源单元190在控制器180的控制下接收外部电力或内部电力并且提供操作各元件和组件所需的适当的电力。
这里描述的各种实施方式可以以使用例如计算机软件、硬件或其任何组合的计算机可读介质来实施。对于硬件实施,这里描述的实施方式可以
通过使用特定用途集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理装置(DSPD)、可编程逻辑装置(PLD)、现场可编程门阵列(FPGA)、处理器、控制器、微控制器、微处理器、被设计为执行这里描述的功能的电子单元中的至少一种来实施,在一些情况下,这样的实施方式可以在控制器180中实施。对于软件实施,诸如过程或功能的实施方式可以与允许执行至少一种功能或操作的单独的软件模块来实施。软件代码可以由以任何适当的编程语言编写的软件应用程序(或程序)来实施,软件代码可以存储在存储器160中并且由控制器180执行。
至此,己经按照其功能描述了移动终端。下面,为了简要起见,将描述诸如折叠型、直板型、摆动型、滑动型移动终端等等的各种类型的移动终端中的滑动型移动终端作为示例。因此,本发明实施例能够应用于任何类型的移动终端,并且不限于滑动型移动终端。
如图1中所示的移动终端100可以被构造为利用经由帧或分组发送数据的诸如有线和无线通信系统以及基于卫星的通信系统来操作。
现在将参考图2描述其中根据本发明实施例的移动终端能够操作的通信系统。
这样的通信系统可以使用不同的空中接口和物理层中至少一种。例如,由通信系统使用的空中接口包括例如频分多址(FDMA)、时分多址(TDMA)、码分多址(CDMA)和通用移动通信系统(UMTS)(特别地,长期演进(LTE))、全球移动通信系统(GSM)等等。作为非限制性示例,下面的描述涉及CDMA通信系统,但是这样的教导同样适用于其它类型的系统。
参考图2,CDMA无线通信系统可以包括多个移动终端100、多个基站(BS)270、基站控制器(BSC)275和移动交换中心(MSC)280。MSC280被构造为与公共电话交换网络(PSTN)290形成接口。MSC280还被构造为与可以经由回程线路耦接到基站270的BSC275形成接口。回程线路可以根据若干己知的接口中的任一种来构造,所述接口包括例如E1/T1、ATM,IP、PPP、帧中继、HDSL、ADSL或xDSL。将理解的是,如图2中所示的系统可以包括多个BSC2750。
每个BS270可以服务一个或多个分区(或区域),由多向天线或指向特定
方向的天线覆盖的每个分区放射状地远离BS270。或者,每个分区可以由设置为分集接收的两个或更多天线覆盖。每个BS270可以被构造为支持多个频率分配,并且每个频率分配具有特定频谱(例如,1.25MHz,5MHz等等)。
分区与频率分配的交叉可以被称为CDMA信道。BS270也可以被称为基站收发器子系统(BTS)或者其它等效术语。在这样的情况下,术语"基站"可以用于笼统地表示单个BSC275和至少一个BS270。基站也可以被称为"蜂窝站"。或者,特定BS270的各分区可以被称为多个蜂窝站。
如图2中所示,广播发射器(BT)295将广播信号发送给在系统内操作的移动终端100。如图1中所示的广播接收模块111被设置在移动终端100处以接收由BT295发送的广播信号。在图2中,示出了几个全球定位系统(GPS)卫星300。卫星300帮助定位多个移动终端100中的至少一个。
在图2中,描绘了多个卫星300,但是理解的是,可以利用任何数目的卫星获得有用的定位信息。如图1中所示的GPS模块115通常被构造为与卫星300配合以获得想要的定位信息。替代GPS跟踪技术或者在GPS跟踪技术之外,可以使用可以跟踪移动终端的位置的其它技术。另外,至少一个GPS卫星300可以选择性地或者额外地处理卫星DMB传输。
作为无线通信系统的一个典型操作,BS270接收来自各种移动终端100的反向链路信号。移动终端100通常参与通话、消息收发和其它类型的通信。特定基站270接收的每个反向链路信号被在特定BS270内进行处理。获得的数据被转发给相关的BSC275。BSC提供通话资源分配和包括BS270之间的软切换过程的协调的移动管理功能。BSC275还将接收到的数据路由到MSC280,其提供用于与PSTN290形成接口的额外的路由服务。类似地,PSTN290与MSC280形成接口,MSC与BSC275形成接口,并且BSC275相应地控制BS270以将正向链路信号发送到移动终端100。
基于上述可选的移动终端硬件结构以及通信系统,提出本发明方法各个实施例。
目前,在具有拍摄功能的终端进行拍摄时,预览图像的数据及最终的拍摄数据会采用相同的曝光参数,以实现所见与所得效果一致的目的。例
如,在相机预览时,每一预览帧的曝光参数为感光度ISO400、曝光时间为1/100秒,然后进行拍摄,最后生成同样参数的照片。这样拍摄的照片和预览图像的效果是基本一致的。但是这个过程对于长曝光来说就会存在问题,例如,如果当前环境要达到合理的曝光效果时间需要8S,那么从预览角度来看,每8S才会刷新一次界面,这个超长延迟对于等待拍摄的用户来说会是很差的用户体验。本发明实施例基于与画面的曝光效果紧密相关的三个方面:光圈、曝光时间以及ISO,提出了一种预览图像的拍摄参数与实际拍摄参数不同的拍摄方法,即在获得预览图像时,为了提高用户体验感,优先保障画面的曝光时间足够短,在获取最终的拍摄照片时,为了保障最后拍摄的照片具有足够的曝光值,在拍摄时通过光圈或者是ISO,或者是两者配合对曝光值进行补偿,也保证了实际拍摄时因为曝光时间变短而对画面效果造成的影响。
如图3所示,本发明实施例提出了一种拍摄装置1,该装置包括:第一获取模块01、计算模块02、第二获取模块03和拍摄模块04。
第一获取模块01,设置为获取预览图像的第一拍摄参数;其中第一拍摄参数包括第一快门速度。
在本发明实施例中,用户在拍摄照片之前会通过预览图像了解即将拍摄的照片的画面效果,以确定是否继续拍摄。为了快速生成该预览图像,提高正在等待拍摄的用户的预览体验,可以以第一快门速度生成该预览图像。
可选地,该第一快门速度是指快门启动时间为t1的快门启动速度,该第一快门速度的时间需要足够短,不会为用户带来停顿、延迟或等待等预览体验。常见的快门速度的标准有:1/1000秒、1/500秒、1/250秒、1/125秒、1/60秒、1/30秒、1/15秒、1/8秒、1/4秒、1/2秒和1秒。因此,为了达到前述目的,可以选择t1<1/4s,当然,在不同的实施例中,还可以根据不同的应用场景或者不同用户的不同拍摄习惯将该第一快门速度设置为不同的数值,在本发明实施例中对于第一快门速度的具体数值不做限制。
计算模块02,设置为在拍摄模块04进行拍摄之前根据第一拍摄参数计算预览图像的曝光值。
在本发明实施例中,以第一快门速度获取一张或多张预览图像以后,用户可以根据不同的预览图像的画面效果确定一张最终的预览图像,并以该最终的预览图像为准进行拍摄。由于影响图像画面效果的主要因素就是曝光值,因此,为了使得实际拍摄的照片的画面效果与最终确定的预览图像的画面效果一致,需要保证在进行拍摄时具有与该预览图像相同或相似的曝光值,该相似是指曝光值的差异值小于或等于预设的差异阈值,该差异阈值的具体数值可以根据不同的应用场景自行定义,如根据对照片质量要求的高低不同进行定义。这里,以曝光值完全相同的情况为例进行说明。为了拍摄出与预览图像具有相同画面效果的照片,需要首先获得该预览图像的曝光值,该工作由计算模块02完成。在通过计算模块02计算曝光值之前,先对第一拍摄参数进行详细介绍,因为曝光值是基于第一拍摄参数进行计算的。
可选地,第一拍摄参数还包括:第一光圈值和第一感光度。
在本发明实施例中,一个照片的拍摄参数中可以包含光圈、曝光时间以及ISO信息,而这些信息是与画面的曝光效果紧密相关的三个方面。
光圈,也叫焦比,是照相机上用来控制镜头孔径大小的部件,以控制景深、镜头成像质素、以及和快门协同控制进光量。有时也表示光圈值的概念。表达光圈大小用f值表示,对于已经制造好的镜头,不能随意改变镜头的直径,但是可以通过在镜头内部加入多边形或者圆型,并且面积可变的孔状光栅来达到控制镜头通光量,这个装置就叫做光圈,光圈的f值=镜头的焦距/光圈口径。光圈对照片的影响:光圈越大进光量越大,景深越小,f值越小。完整的光圈值系列如下:f1.0、f1.4、f2.0、f2.8、f4.0、f5.6、f8.0、f11、f16、f22、f32、f45以及f64。这里值得一提的是光圈f值越小,通光孔径越大,在同一单位时间内的进光量便越多,而且上一级的进光量刚好是下一级的两倍,例如光圈从f8调整到f5.6,进光量便多一倍,我们也说光圈开大了一级。f5.6的通光量是f8的两倍。同理,f2是f8光通量的16倍,从f8调整到f2,光圈开大了四级。对于消费型数码相机而言,光圈f值常常介于f2.8-f11。此外许多数码相机在调整光圈时,可以做1/3级的调整。f后面的数值越小,光圈越大。光圈的作用在于决定镜
头的进光量,光圈越大,进光量越多;反之,则越小。简单的说就是,在快门速度(或称曝光速度,与曝光时间成反比)不变的情况下,光圈f数值越小光圈越大,进光量越多,画面比较亮;光圈f数值越大光圈越小,画面比较暗。
曝光时间由快门速度控制,快门速度表示相机进行拍摄的时候快门保持开启状态的时间。该时间越短,曝光时间越短,该时间越长,曝光时间越长。快门速度通过秒或几分之一秒来表示时间的长短。不同的相机生产厂家的机身会有不同的快门速度起始范围,这个范围也是很重要的。所有的单镜头反光照相机至少都有以下的快门速度(也许会更多):1、1/2、1/4、1/8、1/15、1/30、1/60、1/125、1/250、1/500、和1/1000秒。通过该一系列的快门速度会发现,每一个快门速度都是前一个速度的一半,而是后一个的两倍。例如,1/125秒是1/60秒的一半,而是1/250秒的两倍。它们都相差一挡,每一挡都相差一半或一倍的时间。从1/125秒到1/250秒移动了一挡(时间减半),到1/500秒又移动一挡(再次减半),到1/1000秒就移动了三挡。当相机设置为某种特定的自动曝光模式时,大多数相机可以实现“无级”的快门速度。也就是说,快门速度可以被电子装置决定并设置为任何快门速度,而不受固定的挡位的限制。但即使相机被设置为这种模式,“减半”和“加倍”的概念依然存在。在最近几年新上市相机中,大部分相机的快门速度可以进行1/3挡的增减。例如,某Nikon相机的快门挡位包括:1/8、1/10、1/13、1/15、1/20、1/25、1/30、1/40、1/50、和1/60秒等等。从1/30到1/60秒是一挡,同样的,从1/20到1/40和从1/13到1/25也是一档。当你改变了快门速度时,同时也改变了运动物体被记录在底片上的方式。快门速度越快,运动物体就会在底片呈现更清晰的影象,反之,快门速度越慢,运动的物体在底片上呈现的影象就越模糊。
快门速度和镜头的光圈大小一起决定光到达胶片或传感器的量。通常,曝光是通过曝光值(EV值)衡量的,表示减半或者加倍的曝光。有多个不同的快门速度和光圈组合能达到相同的曝光:快门速度减半就会将曝光值提高1EV,光圈再加倍(即光圈值减半)就会将曝光值提高2EV。这样,1/250秒的快门速度与f/8的光圈大小、1/500秒与f/5.6、1/125秒与f/11
等曝光组合都能达到相同的曝光值。
ISO是一种类似于胶卷感光度的指标,实际上,数码相机的ISO是通过调整感光器件的灵敏度或者合并感光点来实现的,也就是说是通过提升感光器件的光线敏感度或者合并几个相邻的感光点来达到提升ISO的目的。感光器件都有一个反应能力,这个反应能力是固定不变的,提升数码相机的ISO是通过两种方式实现的:1、强行提高每个像素点的亮度和对比度;2、使用多个像素点共同完成原来只要一个像素点来完成的任务。由此可见,数码相机提升ISO以后对画质的损失是很大的,尤其感光器件面积较小时,提升ISO对于画质来说是致命的。因此,一般在相机的感光器件质量不允许的情况下,为了保证画质,都会尽量保持ISO最初的设置值,不对ISO进行调整。
基于上述介绍,下面详细介绍计算模块02如何通过第一拍摄参数计算预览图像的曝光值。
计算模块02设置为根据第一拍摄参数计算预览图像的曝光值包括步骤101-102:
101、根据预设的曝光值映射表获取第一快门速度对应的第一快门级数、第一光圈值对应的第一光圈级数以及第一感光度对应的第一感光级数。
在本发明实施例中,基于以上介绍可知,光圈值、快门速度和ISO对于照片的曝光效果至关重要,因此,需要首先从预览图像的第一拍摄参数中获取第一快门速度、第一光圈值和第一感光度。
在本发明实施例中,对于曝光值(Exposure Value,EV)的一种定义是:曝光值是一个以2为底的对数刻度系统,其中f是光圈值;t是曝光时间(与快门速度成反比),单位秒。因此,计算模块02对曝光值的计算可以通过上述计算式,在获得第一光圈值f和第一快门速度1/t的基础上获取当前的曝光值。另外,由于曝光值的另一种定义为:当感光度为ISO 100、光圈系数为F1、曝光时间为1秒时,曝光量定义为0,曝光量减少一档(快门速度减少一半或者光圈缩小一档),EV值增加1。曝光值代表能够给出同样曝光的所有相机光圈快门组合。快门速度越低,光圈越大,则通光时间和面积就越大,即曝光值越大。例如光圈f/2.8,快门1/15
秒的EV值比光圈f/8,快门1/60秒的EV值大。基于上述原理,计算模块02对曝光值的计算还可以通过一个预设的曝光值映射表进行,下面将对曝光表的计算方案做详细介绍。
在本发明实施例中,该预设的曝光值映射表可以包含拍摄终端的各个可实施的快门速度、光圈值以及ISO,并且为不同的快门速度设置了不同的快门等级,不同的快门等级会对应不同的快门级数。同理,该预设的曝光值映射表中还为不同的光圈值设置了不同的光圈等级,不同的光圈等级会对应不同的光圈级数;并且为不同的ISO设置了不同的感光等级,不同的感光等级会对应不同的感光级数。该预设的曝光值映射表的一个实施例如表1所示。需要说明的是,下述表格仅列出了与部分内容,随着快门速度、光圈值和ISO的逐渐增加或减小,对应的快门级数、光圈级数和感光级数也会相应的加1或减1,在此不一一列举。
表1
快门速度 | 1 | 1/2 | 1/4 | 1/8 | 1/15 | 1/30 | 1/60 | 1/125 | 1/250 | 1/500 | 1/1000 |
快门级数T | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
光圈值 | 1 | 1.4 | 2 | 2.8 | 4 | 5.6 | 8 | 11 | 16 | 22 | 32 |
光圈级数F | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
ISO | 100 | 200 | 400 | 800 | 1600 | 3200 | 6400 |
感光级数I | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
在本发明实施例中,获取了第一拍摄参数中的第一快门速度、第一光圈值和第一感光度以后,便可以根据曝光值映射表,即表1获取上述参数相应的级数,即第一快门级数、第一光圈级数以及第一感光级数。例如,假设第一快门速度为1/250s,第一光圈值为f8,第一感光度为200;则第一快门级数为8,第一光圈级数为6,第一感光级数为1。
需要说明的是,该预设的曝光值映射表可以根据不同的应用场景或者应用习惯等设置成不同的形式,不限于上述的表1。
在其它实施例中,由于ISO一般受限于感光器件质量,如果感光器件质量较差,在进行ISO调节时会影响画质。因此,可以保持ISO不变的基
础上仅设置快门速度与光圈值的映射表,并且该映射表中可以直接对照出不同的快门速度与光圈值所对应的曝光值。如表2所示,该表为以ISO100为基准时设置的快门速度、光圈值和曝光值三者的映射表。只要在ISO100下获得的曝光值,都可以根据该表在相同的曝光值下选择不同的快门速度与光圈值组合。
102、将第一快门级数、第一光圈级数和第一感光级数代入以下第一计算式计算所述曝光值:
EV=F+T+I;
其中,EV为曝光值,F为光圈级数,T为快门级数,I为感光级数。
在本发明实施例中,首先以表1为例进行说明如何根据第一快门级数、第一光圈级数和第一感光级数计算曝光值。这里,在表1的基础上,还设置了曝光值得计算公式,即上述的第一计算式,通过该计算式对获取的第一快门级数、第一光圈级数和第一感光级数进行相加即是第一拍摄参数对应的曝光值。例如,在上述实施例中获取第一快门级数8、第一光圈级数6、第一感光级数1以后,则EV=8+6+1=15。所以,根据表1实施例计算的第一拍摄参数的曝光值为15。
表2
可选地,感光级数为最小级数。
在本发明实施例中,上述的第一计算式中包含I主要是考虑到在某些相机或拍摄终端的感光器件质量比较好时,可以通过调节ISO的数值例如
200、400、800等,从而获得不同的曝光量,并且也不会影响拍摄照片的质量,但是,由于对一般的相机或拍摄终端来说,对ISO的调节通常会破坏画质。因此,为了保证照片的画质,一般尽量保持ISO不变,通常保持为最小值,即ISO为100。则在进行EV值计算时,一般选择I=0。
下面以表2为例进行说明如何获取第一拍摄参数对应的曝光值。通过表2可知,当第一快门速度为1/250s,第一光圈值为f8时,表2中对应的EV值为14,由于表2实施例是以ISO100为基础的,因此,计算出的该EV值中未加入ISO的对应级数或对应EV值。在其它实施例中,如果在表2的基础上想要加入ISO的影响因素,可以预先设置如表1中所示的ISO的感光级数映射表,或者ISO的EV值对照表,即当ISO为100时,EV值+0;当ISO为200时,EV值+1;当ISO为400时,EV值+2;当ISO为800时,EV值+3;当ISO为1600时,EV值+4;当ISO为3200时,EV值+5;当ISO为6400时,EV值+6。例如,上述实施例计算出的EV值为14,如果在ISO为100时该EV值仍为14,在ISO为200时,该EV值+1=15。
通过上述的两种实施例方案,便可以计算出预览图像中第一拍摄参数对应的曝光值。
第二获取模块03,设置为保持曝光值不变获取具有第二快门速度的第二拍摄参数。
在本发明实施例中,通过计算模块02计算出预览图像的曝光值以后,为了获得与预览图像相同的画质,并且延长曝光时间,可以在保持计算出的曝光值不变的基础上,减小快门速度,从而获得第二拍摄参数。例如,将第一快门速度变换为第二快门速度。可选地,第二快门速度是指快门启动时间为t2的快门启动速度;t2≥1/4s。该第二快门速度慢于第一快门速度,在降低快门速度时,会增加拍摄时的曝光时间,从而增加曝光量。因此,为了获得与预览图像相同的画质,可以通过调整光圈值和ISO中至少一种对快门速度进行补偿,以保持曝光值不变。
可选地,第二拍摄参数还包括:第二光圈值和第二感光度。
在本发明实施例中,通过计算模块02计算出预览图像的曝光值以后,如果想要在快门速度降为第二快门速度以后保持该曝光值不变,则需要获
取与该第二快门速度相对应的第二光圈值和第二感光度。具体通过下述的第二获取模块03获取该第二光圈值和第二感光度。
第二获取模块03设置为保持曝光值不变获取具有第二快门速度的第二拍摄参数包括步骤201-204:
201、根据预设的曝光值映射表获取第二快门速度对应的第二快门级数。
在本发明实施例中,同样以上述的表1和表2为例进行说明,例如,假设在拍摄时快门速度由原来预览时的第一快门速度1/250s降为第二快门速度1秒,则在表1中可知该第二快门速度对应的第二快门级数为0。如果第二快门速度更大,为2秒、4秒、8秒等,则该第二快门级数依次逐渐减1。例如,当第二快门速度为2秒时,第二快门级数为-1;当第二快门速度为8秒时,第二快门级数为-3。其他开门速度数值依此类推,在此不做赘述。
202、根据第一计算式和第二快门级数获取第二光圈级数与第二感光级数之和。
在本发明实施例中,已知曝光值和第二快门级数,则通过上述的第一计算式便可以获得第二光圈级数与第二感光级数之和。例如,假设EV=8,第二快门级数为-1,即T=-1,则根据第一计算式EV=F+T+I可知,F+I=EV-T=9。
203、根据预设的曝光值映射表以及第二光圈级数与第二快门级数之和获取第二光圈值和第二感光度的一个或多个参数组合。
在本发明实施例中,通过表1可以获得多个F+I=9的组合,例如,ISO为200(I=1),光圈值为16(F=8);ISO为100(I=0),光圈值为22(F=9)。
需要说明的是,受相机本身性能的限制,自身光圈和ISO的数值仅有几个选择,因此所得的EV值也受限制,因此在具体拍摄时,还需要根据自身相机的性能对快门速度进行相应的调整。另外,通过表2也可以看出,不同的快门速度和光圈值能够达到的最大EV值时有限制的,在对相机进行调节时可以根据不同的快门速度和光圈值对应的EV值限制范围进行调节。
204、将一个或多个参数组合中的任意一个参数组合作为第二拍摄参
数。
在本发明实施例中,通过上述步骤获得光圈值和ISO的多个参数组合之后,拍摄者可以根据自身的相机性能确定一个合适的组合参数,例如,ISO为200(I=1),光圈值为16(F=8)。并将该ISO值,光圈值和上述的第二快门速度一起作为实际拍摄时的第二拍摄参数。
拍摄模块04,设置为采用包括第二快门速度的第二拍摄参数进行拍摄,其中,第二快门速度小于第一快门速度。
在本发明实施例中,根据以上方案获取第二拍摄参数以后,便可以根据该第二拍摄参数进行实际拍摄了,此时拍摄获得的照片跟预览图像具有相同的曝光值,因此,拍摄的照片具有与预览图像基本相同的画面效果。
本发明实施例还提供了一种拍摄方法,如图4、图5所示,需要说明的是,上述的装置实施例中的任何实施例同样适用于本发明的方法实施例中,在此不再赘述。该方法包括步骤301-302:
301、获取预览图像的第一拍摄参数;其中第一拍摄参数包括第一快门速度。
可选的,步骤301之前,为了快速生成该预览图像,提高正在等待拍摄的用户的预览体验,可以以第一快门速度生成该预览图像。
302、采用包括第二快门速度的第二拍摄参数进行拍摄,其中,第二快门速度小于第一快门速度。
可选地,该方法还包括:
在进行拍摄之前根据第一拍摄参数计算预览图像的曝光值。
保持该曝光值不变获取第二拍摄参数。
可选地,
第一快门速度是指快门启动时间为t1的快门启动速度;t1<1/4s。
第二快门速度是指快门启动时间为t2的快门启动速度;t2≥1/4s。
可选地,第一拍摄参数还包括:第一光圈值和第一感光度。
根据第一拍摄参数计算预览图像的曝光值包括:
根据预设的曝光值映射表获取第一快门速度对应的第一快门级数、第一光圈值对应的第一光圈级数以及第一感光度对应的第一感光级数。
将第一快门级数、第一光圈级数和第一感光级数代入以下第一计算式计算曝光值:
EV=F+T+I;
其中,EV为曝光值,F为光圈级数,T为快门级数,I为感光级数。
可选地,感光级数为最小级数。
可选地,第二拍摄参数还包括:第二光圈值和第二感光度。
保持曝光值不变获取第二拍摄参数包括:
根据预设的曝光值映射表获取第二快门速度对应的第二快门级数。
根据第一计算式和第二快门级数获取第二圈级数与第二感光级数之和。
根据预设的曝光值映射表以及第二光圈级数与第二感光级数之和获取第二光圈值和第二感光度的一个或多个参数组合。
将一个或多个参数组合中的任意一个参数组合作为第二拍摄参数。
本发明实施例提出了一种拍摄装置和方法,该装置包括:第一获取模块和拍摄模块。第一获取模块获取预览图像的第一拍摄参数;其中第一拍摄参数包括第一快门速度;拍摄模块采用包括第二快门速度的第二拍摄参数进行拍摄,其中,第二快门速度小于第一快门速度。通过本发明实施例的方案,能够提高用户的预览体验,并且保障预览图像与拍摄照片的画面效果保持一致。
本发明实施例还提供了一种移动终端,包括:
存储器,设置为存储指令;
处理器,设置为执行所述指令,实现如下的拍摄步骤:
获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;
采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
可选的,所述处理器,还设置为执行所述指令,实现如下的拍摄步骤:
在进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;
保持所述曝光值不变获取所述第二拍摄参数。
可选的,所述第一拍摄参数还包括:第一光圈值和第一感光度;
所述处理器,是设置为通过如下方式实现执行指令实现根据所述第一拍摄参数计算所述预览图像的曝光值的步骤:
根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;
将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:
EV=F+T+I;
其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
可选的,所述感光级数为最小级数。
可选的,所述第二拍摄参数还包括:第二光圈值和第二感光度;
所述处理器,是设置为通过如下方式实现执行指令实现保持所述曝光值不变获取所述第二拍摄参数的步骤:
根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;
根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;
根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;
将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
所述存储器可为图1所述移动终端的存储器160;所述处理器可设置在图1所述移动终端的控制器180中。
本发明实施例还提供了一种计算机可读存储介质,其上存储有计算机程序,所述计算机程序被处理器执行时实现下述拍摄的步骤:
获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;
采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
可选的,所述计算机程序被处理器执行时还实现下述拍摄的步骤:
在进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;
保持所述曝光值不变获取所述第二拍摄参数。
可选的,所述第一拍摄参数还包括:第一光圈值和第一感光度;
所述计算机程序被处理器执行时通过如下方式实现根据所述第一拍摄参数计算所述预览图像的曝光值的步骤:
根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;
将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:
EV=F+T+I;
其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
可选的,所述感光级数为最小级数。
可选的,所述第二拍摄参数还包括:第二光圈值和第二感光度;
所述计算机程序被处理器执行时通过如下方式实现保持所述曝光值不变获取所述第二拍摄参数的步骤:
根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;
根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;
根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;
将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
需要说明的是,在本文中,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
上述本发明实施例序号仅仅为了描述,不代表实施例的优劣。
本领域普通技术人员可以理解,上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中,在以上描述中提及的功能模块/单元之间的划分不一定对应于物理单元的划分;例如,一个物理组件可以具有多个功能,或者一个功能或步骤可以由若干物理组件合作执行。某些组件或所有组件可以被实施为由处理器,如数字信号处理器或微处理器执行的软件,或者被实施为硬件,或者被实施为集成电路,如专用集成电路。这样的软
件可以分布在计算机可读介质上,计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的,术语计算机存储介质包括用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于RAM、ROM、EEPROM、闪存或其他存储器技术、CD-ROM、数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。此外,本领域技术人员公知的是,通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据,并且可包括任何信息递送介质。以上仅为本发明的可选实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。
本发明实施例提高了用户的预览体验,并且保障预览图像与拍摄照片的画面效果保持一致。
Claims (20)
- 一种拍摄装置,所述装置包括:第一获取模块和拍摄模块;所述第一获取模块,设置为获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;所述拍摄模块,设置为采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
- 如权利要求1所述的拍摄装置,其中,所述装置还包括计算模块和第二获取模块;所述计算模块,设置为在所述拍摄模块进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;所述第二获取模块,设置为保持所述曝光值不变获取所述第二拍摄参数。
- 如权利要求2所述的拍摄装置,其中,所述第一拍摄参数还包括:第一光圈值和第一感光度;所述计算模块设置为通过如下方式实现根据所述第一拍摄参数计算所述预览图像的曝光值:根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:EV=F+T+I;其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
- 如权利要求3所述的拍摄装置,其中,所述感光级数为最小级数。
- 如权利要求3或4所述的拍摄装置,其中,所述第二拍摄参数还包括:第二光圈值和第二感光度;所述第二获取模块设置为通过如下方式实现保持所述曝光值不变获取所述第二拍摄参数:根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
- 一种拍摄方法,所述方法包括:获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
- 如权利要求6所述的拍摄方法,其中,所述方法还包括:在进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;保持所述曝光值不变获取所述第二拍摄参数。
- 如权利要求7所述的拍摄方法,其中,所述第一拍摄参数还包括:第一光圈值和第一感光度;所述根据所述第一拍摄参数计算所述预览图像的曝光值包括:根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:EV=F+T+I;其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
- 如权利要求8所述的拍摄方法,其中,所述感光级数为最小级数。
- 如权利要求7或8所述的拍摄方法,其中,所述第二拍摄参数还包括:第二光圈值和第二感光度;所述保持所述曝光值不变获取所述第二拍摄参数包括:根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
- 一种移动终端,包括:存储器,设置为存储指令;处理器,设置为执行所述指令,实现如下的拍摄步骤:获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
- 如权利要求11所述的移动终端,其中,所述处理器还设置为执行所述指令,实现如下的拍摄步骤:在进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;保持所述曝光值不变获取所述第二拍摄参数。
- 如权利要求12所述的移动终端,其中,所述第一拍摄参数还包括:第一光圈值和第一感光度;所述处理器,是设置为通过如下方式实现执行指令实现根据所述第一拍摄参数计算所述预览图像的曝光值的步骤:根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:EV=F+T+I;其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
- 如权利要求13所述的移动终端,其中,所述感光级数为最小级数。
- 如权利要求12或13所述的移动终端,其中,所述第二拍摄参数还包括:第二光圈值和第二感光度;所述处理器,是设置为通过如下方式实现执行指令实现保持所述曝光值不变获取所述第二拍摄参数的步骤:根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
- 一种计算机可读存储介质,其上存储有计算机程序,所述计算机程序被处理器执行时实现下述拍摄的步骤:获取预览图像的第一拍摄参数;其中所述第一拍摄参数包括第一快门速度;采用包括第二快门速度的第二拍摄参数进行拍摄,其中,所述第二快门速度小于所述第一快门速度。
- 如权利要求16所述的存储介质,其中,所述计算机程序被处理器执行时还实现下述拍摄的步骤:在进行拍摄之前根据所述第一拍摄参数计算所述预览图像的曝光值;保持所述曝光值不变获取所述第二拍摄参数。
- 如权利要求17所述的存储介质,其中,所述第一拍摄参数还包括:第一光圈值和第一感光度;所述计算机程序被处理器执行时通过如下方式实现根据所述第一拍摄参数计算所述预览图像的曝光值的步骤:根据预设的曝光值映射表获取所述第一快门速度对应的第一快门级数、所述第一光圈值对应的第一光圈级数以及所述第一感光度对应的第一感光级数;将所述第一快门级数、所述第一光圈级数和所述第一感光级数代入以下第一计算式计算所述曝光值:EV=F+T+I;其中,所述EV为曝光值,所述F为光圈级数,所述T为快门级数,I为感光级数。
- 如权利要求18所述的存储介质,其中,所述感光级数为最小级数。
- 如权利要求17或18所述的存储介质,所述第二拍摄参数还包括:第二光圈值和第二感光度;所述计算机程序被处理器执行时通过如下方式实现保持所述曝光值不变获取所述第二拍摄参数的步骤:根据所述预设的曝光值映射表获取所述第二快门速度对应的第二快门级数;根据所述第一计算式和所述第二快门级数获取第二光圈级数与第二感光级数之和;根据所述预设的曝光值映射表以及所述第二光圈级数与所述第二感光级数之和获取所述第二光圈值和所述第二感光度的一个或多个参数组合;将所述一个或多个参数组合中的任意一个参数组合作为所述第二拍摄参数。
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