CN105306806A - Mobile terminal and photographing method thereof - Google Patents
Mobile terminal and photographing method thereof Download PDFInfo
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- CN105306806A CN105306806A CN201410822953.6A CN201410822953A CN105306806A CN 105306806 A CN105306806 A CN 105306806A CN 201410822953 A CN201410822953 A CN 201410822953A CN 105306806 A CN105306806 A CN 105306806A
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Abstract
The invention belongs to the field of mobile terminals, and provides a mobile terminal and a photographing method thereof. In the embodiment of the invention, by obtaining exposure parameters of a front camera and a back area of a mobile terminal in a current environment and ambient brightness detected by a photosensitive sensor to calculate the brightness of a current scene to be photographed, determining a brightness level of the scene brightness according to the scene brightness and a preset brightness level threshold, and photographing the current scene to be photographed according to a preset frame number corresponding to the brightness level, the quality of a photo photographed at low brightness can be improved, the processing time of noise reduction and synthesis of the photographed photo can be effectively controlled, and the user experience is enhanced.
Description
Technical field
The invention belongs to field of mobile terminals, a kind of method particularly relating to mobile terminal and take pictures.
Background technology
Popular along with smart mobile phone is simultaneously along with user uses taking photograph of intelligent mobile phone more and more frequent in low light situations, also more and more higher to the effect requirements of low-light (level).Low-illumination scene due to its photoenvironment poor, the effect color representation power under normal picture taking mode is poor, and noise is comparatively large, and picture overall brightness is also lower.Therefore increasing algorithm application is in low-illumination scene, such as single frames denoising, single frames luminance raising.Along with the lifting of processor ability, increasing multiframe algorithm is applied in low-illumination scene gradually, multiframe denoising, and multiframe promotes brightness etc.Multiple image is all fixed value herein, as long as enter night scene mode just determine that taking fixing frame number image synthesizes.
But, in the pattern that existing low-light (level) is taken pictures, the multiframe composition algorithm Problems existing of fixing frame number is: in some scene, does not need so much two field picture to carry out synthesizing and also can get a desired effect, but spend the longer time to carry out algorithm compose operation, bring bad experience to user; Some extreme scenes is inadequate due to multiframe data again, causes synthesizing rear image effect and fails to reach user's expection.
Summary of the invention
The object of the present invention is to provide a kind of method that mobile terminal is taken pictures, be intended to solve effect when current mobile terminal adopts when low-light (level) is taken pictures anchor-frame to carry out shooting photomontage to scene undesirable or take a long time, bring the problem of bad experience to user.
In order to solve the problems of the technologies described above, the present invention is achieved in that
The method that mobile terminal is taken pictures, described mobile terminal comprises front-facing camera, post-positioned pick-up head and light sensor, said method comprising the steps of:
The exposure parameter of described front-facing camera and described post-positioned pick-up head and the ambient brightness of described light sensor detection under acquisition current environment;
Current scene brightness to be captured is calculated according to described exposure parameter and described ambient brightness;
Determine the gray scale of described scene brightness according to described scene brightness and predetermined luminance level threshold, and according to the default frame number corresponding with described gray scale, current scene to be captured is taken pictures.
Another object of the present invention is to provide a kind of mobile terminal, comprise front-facing camera, post-positioned pick-up head and light sensor, described mobile terminal also comprises:
Acquiring unit, the ambient brightness that exposure parameter and described light sensor for described front-facing camera under obtaining current environment and described post-positioned pick-up head detect;
Computing unit, for calculating current scene brightness to be captured according to described exposure parameter and described ambient brightness;
Determining unit, for determining the gray scale of described scene brightness according to described scene brightness and predetermined luminance level threshold;
Photographing unit, for taking pictures to current scene to be captured according to the default frame number corresponding with described gray scale.
In embodiments of the present invention, the ambient brightness detected by exposure parameter and the light sensor of mobile terminal front-facing camera and post-positioned pick-up head under acquisition current environment is to calculate current scene brightness to be captured, the gray scale of described scene brightness is determined according to described scene brightness and predetermined luminance level threshold, and according to the default frame number corresponding with described gray scale, current scene to be captured is taken pictures, the quality of photo when low-light level is taken pictures can be improved, effectively can control again the processing time of the photo of shooting being carried out to noise reduction synthesis, improve the experience of user.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method that mobile terminal that the embodiment of the present invention provides is taken pictures;
Fig. 2 is the flow chart of the method that mobile terminal that first embodiment of the invention provides is taken pictures;
Fig. 3 is the flow process of the method that mobile terminal that second embodiment of the invention provides is taken pictures;
Fig. 4 is the frame construction drawing of the mobile terminal that the embodiment of the present invention provides;
Fig. 5 is the frame construction drawing of the mobile terminal that third embodiment of the invention provides;
Fig. 6 is the frame construction drawing of the mobile terminal that fourth embodiment of the invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below in conjunction with specific embodiment, specific implementation of the present invention is described in detail:
The flow process of the method that the mobile terminal that Fig. 1 shows the embodiment of the present invention to be provided is taken pictures, for convenience of explanation, only list the part relevant to the embodiment of the present invention, details are as follows:
Embodiments provide a kind of method that mobile terminal is taken pictures, for when low-light level is taken pictures, treat photographed scene according to the gray scale setting frame number corresponding with this gray scale of scene to be captured to take, and according to preset algorithm photomontage, this mobile terminal (mobile phone, panel computer, electronic reader etc.) comprises front-facing camera, post-positioned pick-up head and light sensor, and the method specifically comprises the following steps:
S100, the exposure parameter of this front-facing camera and this post-positioned pick-up head and the ambient brightness of this light sensor detection under acquisition current environment.In the present embodiment, this exposure parameter comprises time for exposure and exposure gain, the mode obtaining the exposure parameter of this front-facing camera and the exposure parameter of this post-positioned pick-up head is: control this front-facing camera and take a frame image data respectively with this post-positioned pick-up head, exposure parameter (time for exposure and exposure gain) corresponding is with it obtained, the light sensor ambient brightness that then direct-detection is current from a frame image data of shooting.
S200, calculates current scene brightness to be captured according to this exposure parameter and this ambient brightness.In the present embodiment, because the ambient brightness of the exposure parameter of this front-facing camera and the exposure parameter of this post-positioned pick-up head and the detection of this light sensor may exist inconsistent situation, calculate according to the ambient brightness that default formula and the exposure parameter of this front-facing camera, the exposure parameter of this post-positioned pick-up head and this light sensor detect to determine current (reality) scene brightness to be captured.
It should be noted that, the exposure parameter of this front-facing camera and the exposure parameter of post-positioned pick-up head can not directly be used for calculating, but calculate current (reality) scene brightness to be captured according to the ambient brightness of the exposure parameter of this front-facing camera and each self-corresponding ambient brightness of the exposure parameter of this post-positioned pick-up head and the detection of this light sensor.In addition, the quantity of the front-facing camera of mobile terminal and the quantity of post-positioned pick-up head are not defined as 1, can be respectively multiple (in embodiments of the present invention, multiplely refer to more than 2 or 2), when the quantity of front-facing camera is multiple, the exposure parameter of front-facing camera is the mean value of the exposure parameter of each front-facing camera, and when the quantity of post-positioned pick-up head is multiple, the exposure parameter of post-positioned pick-up head is the mean value of the exposure parameter of each post-positioned pick-up head.
S300, determines the gray scale of this scene brightness according to this scene brightness and predetermined luminance level threshold.
Calculate in the present embodiment step S200 and obtain current (reality) scene brightness to be captured, then judge (reality) scene brightness whether should reach brightness corresponding to default low-light level exposal model according to the luminance threshold preset, if reached, then enter default low-light level exposal model, the gray scale of this scene brightness is determined according to this scene brightness and predetermined luminance level threshold, if when current (reality) scene brightness to be captured does not reach brightness corresponding to default low-light level exposal model, according to initial (dispatching from the factory) frame number, current scene to be captured is taken pictures.
S400, takes pictures to current scene to be captured according to the default frame number corresponding with this gray scale.In the present embodiment, different gray scale correspondences has preset different frame numbers, after determining gray scale, namely according to the default frame number corresponding with this gray scale, current scene to be captured is taken, obtaining the view data of the default frame number corresponding with this gray scale, then exporting preservation according to presetting (synthesis and noise reduction) algorithm photomontage.
The present embodiment is when low-light level is taken pictures, treat photographed scene according to the frame number corresponding with the gray scale of current scene to be captured to take, and according to preset algorithm noise reduction photomontage, the processing time of noise reduction and photomontage determines according to frame number, both improve the quality of photo, increase according to actual frame number again or shorten the processing time of noise reduction and synthesis, there will not be the problem using anchor-frame to take pictures to cause photographic quality not good or waste processing time as existing mobile terminal, promote the experience of user.
Embodiment one:
As first preferred embodiment of the invention, in step s 200, when user selects this post-positioned pick-up head to take, calculate current scene brightness F1 to be captured according to following (presetting) formula:
Wherein, A represents ambient brightness that the exposure parameter of this post-positioned pick-up head is corresponding, B represents the ambient brightness that the exposure parameter of this front-facing camera is corresponding, C represents the ambient brightness that this light sensor detects, E represents predetermined luminance difference limen value, and the unit of A and B and C is cd/m2 (candela every square metre).
It should be noted that: when user selects this post-positioned pick-up head to take (when detecting that post-positioned pick-up head is opened), based on the ambient brightness that the exposure parameter of post-positioned pick-up head is corresponding, carry out calculating current scene brightness F1 to be captured according to above-mentioned default formula.
As shown in Figure 2, as first preferred embodiment of the invention, when user selects this post-positioned pick-up head to take, step S400 comprises the following steps:
S401, obtains the default frame number corresponding with this gray scale;
S402, controls this post-positioned pick-up head and takes current scene according to this default frame number, and according to the view data photomontage of preset algorithm by this default frame number of shooting.
In the present embodiment step S401-S402, the specific embodiment of corresponding the is step S400 when user selects this post-positioned pick-up head to take, this preset algorithm is used for carrying out noise reduction and synthesis process to the view data of the default frame number of shooting.
Embodiment two:
As first preferred embodiment of the invention, the embodiment of step S200 is:
When user selects this front-facing camera to take, calculate current scene brightness F2 to be captured according to following formula:
Wherein, A represents ambient brightness that the exposure parameter of this post-positioned pick-up head is corresponding, B represents the ambient brightness that the exposure parameter of this front-facing camera is corresponding, C represents that the ambient brightness that this light sensor detects, E represent predetermined luminance difference limen value, and the unit of A and B and C is cd/m2.
The present embodiment is corresponding with embodiment one, difference is that user adopts front-facing camera to carry out taking (when detecting that front-facing camera is opened), based on the ambient brightness that the exposure parameter of front-facing camera is corresponding, carry out calculating current scene brightness F2 to be captured according to above-mentioned default formula.
As shown in Figure 3, as second preferred embodiment of the invention, when user selects this front-facing camera to take, step S400 comprises the following steps:
S403, obtains the default frame number corresponding with this gray scale;
S404, controls this front-facing camera and takes current scene according to this default frame number, and according to the view data photomontage of preset algorithm by this default frame number of shooting.
The specific embodiment of what the present embodiment step S403 to S404 was corresponding the is step S400 when user selects this front-facing camera to take.
Fig. 4 shows the frame structure of the mobile terminal that the embodiment of the present invention provides, and for convenience of explanation, only list the part relevant to the embodiment of the present invention, details are as follows:
The mobile terminal that the embodiment of the present invention provides, comprises front-facing camera, post-positioned pick-up head and light sensor, also comprises acquiring unit 100, computing unit 200, determining unit 300 and photographing unit 400;
In the present embodiment, the ambient brightness that acquiring unit 100 detects for the exposure parameter and this light sensor obtaining this front-facing camera and this post-positioned pick-up head under current environment, this exposure parameter comprises time for exposure and exposure gain; Computing unit 200 is for calculating current scene brightness to be captured according to this exposure parameter and this ambient brightness; Determining unit 300 is for determining the gray scale of this scene brightness according to this scene brightness and predetermined luminance level threshold; Photographing unit 400 is for taking pictures to current scene to be captured according to the default frame number corresponding with this gray scale.
It should be noted that, front-facing camera is eliminated in embodiment of the present invention Fig. 4, post-positioned pick-up head and light sensor, but actual is exist, wherein, front-facing camera is arranged at the first surface (front/one side) for mainly operating of mobile terminal, post-positioned pick-up head is arranged at second (one side of the back side/non-principal operation) of mobile terminal, light sensor is arranged at the first surface of mobile terminal or second, mainly be arranged at first surface, when the quantity of light sensor is multiple, the ambient brightness C that light sensor detects is the mean value of the ambient brightness that each light sensor detects.
The embodiment of the present invention is corresponding with the embodiment of the method that above-mentioned mobile terminal is taken pictures, and its operation principle and mode are all corresponding to be suitable for, and is not just repeating here.
Embodiment three:
As third preferred embodiment of the invention, computing unit 200 specifically for:
When user selects this post-positioned pick-up head to take, calculate current scene brightness F1 to be captured according to following formula:
Wherein, A represents ambient brightness that the exposure parameter of this post-positioned pick-up head is corresponding, B represents the ambient brightness that the exposure parameter of this front-facing camera is corresponding, C represents that the ambient brightness that this light sensor detects, E represent predetermined luminance difference limen value, and the unit of A and B and C is cd/m2.
As shown in Figure 5, as third preferred embodiment of the invention, photographing unit 400 comprises the first acquisition subelement 401, first and takes subelement 402 and the first synthon unit 403;
In embodiments of the present invention, first subelement 401 is obtained for obtaining the default frame number corresponding with this gray scale; First shooting subelement 402 is taken current scene according to this default frame number for controlling this post-positioned pick-up head; First synthon unit 403 is for according to the view data photomontage of this default frame number of preset algorithm by shooting.
Third embodiment of the invention is corresponding with the first embodiment, and its operation principle and mode are all corresponding to be suitable for, and is not just repeating here.
Embodiment four:
As four preferred embodiment of the invention, computing unit 200 specifically for:
When user selects this front-facing camera to take, calculate current scene brightness F2 to be captured according to following formula:
Wherein, A represents ambient brightness that the exposure parameter of this post-positioned pick-up head is corresponding, B represents the ambient brightness that the exposure parameter of this front-facing camera is corresponding, C represents that the ambient brightness that this light sensor detects, E represent predetermined luminance difference limen value, and the unit of A and B and C is cd/m2.
As shown in Figure 6, as four preferred embodiment of the invention, photographing unit 400 comprises the second acquisition subelement 404, second and takes subelement 405 and the second synthon unit 406;
In the present embodiment, second subelement 404 is obtained for obtaining the default frame number corresponding with this gray scale; Second shooting subelement 405 is taken current scene according to this default frame number for controlling this front-facing camera; Second synthon unit 406 is for according to the view data photomontage of this default frame number of preset algorithm by shooting.
Fourth embodiment of the invention is corresponding with the second embodiment, and its operation principle and mode are all corresponding to be suitable for, and is not just repeating here.
In embodiments of the present invention, the ambient brightness detected by exposure parameter and the light sensor of mobile terminal front-facing camera and post-positioned pick-up head under acquisition current environment is to calculate current scene brightness to be captured, the gray scale of described scene brightness is determined according to described scene brightness and predetermined luminance level threshold, and according to the default frame number corresponding with described gray scale, current scene to be captured is taken pictures, the quality of photo when low-light level is taken pictures can be improved, effectively can control again the processing time of the photo of shooting being carried out to noise reduction synthesis, improve the experience of user.
It will be appreciated by those skilled in the art that the unit comprised for above-described embodiment is carry out dividing according to function logic, but be not limited to above-mentioned division, as long as corresponding function can be realized; In addition, the concrete title of each functional unit, also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
Those of ordinary skill in the art it is also understood that, the all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, described storage medium, comprises ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a mobile terminal method of taking pictures, described mobile terminal comprises front-facing camera, post-positioned pick-up head and light sensor, it is characterized in that, said method comprising the steps of:
The exposure parameter of described front-facing camera and described post-positioned pick-up head and the ambient brightness of described light sensor detection under acquisition current environment;
Current scene brightness to be captured is calculated according to described exposure parameter and described ambient brightness;
Determine the gray scale of described scene brightness according to described scene brightness and predetermined luminance level threshold, and according to the default frame number corresponding with described gray scale, current scene to be captured is taken pictures.
2. method according to claim 1, is characterized in that, the described step according to described exposure parameter and the current scene brightness to be captured of described ambient brightness calculating comprises:
When user selects described post-positioned pick-up head to take, calculate current scene brightness F1 to be captured according to following formula:
Wherein, A represents ambient brightness that the exposure parameter of described post-positioned pick-up head is corresponding, B represents that the ambient brightness that the exposure parameter of described front-facing camera is corresponding, C represent that the ambient brightness that described light sensor detects, E represent predetermined luminance difference limen value.
3. method according to claim 2, is characterized in that, the described basis default frame number corresponding with described gray scale comprises the following steps the step that current scene is taken:
Obtain the default frame number corresponding with described gray scale;
Control described post-positioned pick-up head to take current scene according to described default frame number, and according to the view data photomontage of preset algorithm by the described default frame number of shooting.
4. method according to claim 1, is characterized in that, the described step according to described exposure parameter and the current scene brightness to be captured of described ambient brightness calculating comprises:
When user selects described front-facing camera to take, calculate current scene brightness F2 to be captured according to following formula:
Wherein, A represents ambient brightness that the exposure parameter of described post-positioned pick-up head is corresponding, B represents that the ambient brightness that the exposure parameter of described front-facing camera is corresponding, C represent that the ambient brightness that described light sensor detects, E represent predetermined luminance difference limen value.
5. method according to claim 4, is characterized in that, the described basis default frame number corresponding with described gray scale comprises the following steps the step that current scene is taken:
Obtain the default frame number corresponding with described gray scale;
Control described front-facing camera to take current scene according to described default frame number, and according to the view data photomontage of preset algorithm by the described default frame number of shooting.
6. a mobile terminal, comprises front-facing camera, post-positioned pick-up head and light sensor, it is characterized in that, described mobile terminal also comprises:
Acquiring unit, the ambient brightness that exposure parameter and described light sensor for described front-facing camera under obtaining current environment and described post-positioned pick-up head detect;
Computing unit, for calculating current scene brightness to be captured according to described exposure parameter and described ambient brightness;
Determining unit, for determining the gray scale of described scene brightness according to described scene brightness and predetermined luminance level threshold;
Photographing unit, for taking pictures to current scene to be captured according to the default frame number corresponding with described gray scale.
7. mobile terminal according to claim 1, is characterized in that, described computing unit specifically for:
When user selects described post-positioned pick-up head to take, calculate current scene brightness F1 to be captured according to following formula:
Wherein, A represents ambient brightness that the exposure parameter of described post-positioned pick-up head is corresponding, B represents that the ambient brightness that the exposure parameter of described front-facing camera is corresponding, C represent that the ambient brightness that described light sensor detects, E represent predetermined luminance difference limen value.
8. mobile terminal according to claim 7, is characterized in that, described photographing unit comprises:
First obtains subelement, for obtaining the default frame number corresponding with described gray scale;
First shooting subelement, takes current scene according to described default frame number for controlling described post-positioned pick-up head;
First synthon unit, for according to the view data photomontage of described default frame number of preset algorithm by shooting.
9. mobile terminal according to claim 1, is characterized in that, described computing unit specifically for:
When user selects described front-facing camera to take, calculate current scene brightness F2 to be captured according to following formula:
Wherein, A represents ambient brightness that the exposure parameter of described post-positioned pick-up head is corresponding, B represents that the ambient brightness that the exposure parameter of described front-facing camera is corresponding, C represent that the ambient brightness that described light sensor detects, E represent predetermined luminance difference limen value.
10. mobile terminal according to claim 9, is characterized in that, described photographing unit comprises:
Second obtains subelement, for obtaining the default frame number corresponding with described gray scale;
Second shooting subelement, takes current scene according to described default frame number for controlling described front-facing camera;
Second synthon unit, for according to the view data photomontage of described default frame number of preset algorithm by shooting.
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