CN104935815A - Method and device for taking pictures, camera and mobile terminal - Google Patents

Abstract

The invention provides a shooting method, a shooting device, a camera and a mobile terminal, suitable for the technical field of digital photograph. The shooting method comprises the steps that the practical size S of an object which is shot at present and the distance L between the shooting object and the camera are determined; the present focusing distance M of the camera is calculated according to the present zooming multiple, the aperture value and the screen pixel parameter Y1 of the camera; the coordinates X and Y of a touch position are obtained; an input shooting instruction is received; the practical focusing distance H is calculated according to S, L, X and Y as well as the screen pixel parameters X1 and Y1 of the camera; and the S, L, X, Y, M and H as well as the difference between M and H are recorded on a photograph. The values of parameters related to the quality of the photograph are recorded on the photograph, quality information is provided for professional photographers, and basis is provided for improving the shooting effects of the camera.

Description

Method and device for taking pictures, camera and mobile terminal

technical field

The invention belongs to the technical field of digital photography, and in particular relates to a method and device for taking pictures, a camera and a mobile terminal.

Background technique

The photos taken by current cameras can record some external information such as shooting time, size and geographical location, which can help users recall the scene where the photo was taken.

However, in the process of realizing the present invention, the inventors found that the cameras provided by the prior art have at least the following problems:

The photos taken by existing cameras cannot record the quality information of the photos, so it is inconvenient for professional photographers to adjust the photo effect and take better photos.

Contents of the invention

In view of this, the embodiment of the present invention provides a method and device for taking pictures, a camera and a mobile terminal to solve the problem that the pictures taken by the cameras provided by the prior art cannot record the quality information of the pictures, so it is inconvenient for professional photographers to adjust the pictures taken. effect, a matter of taking better photos.

In the first aspect, a method for taking pictures is provided, including:

determining the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera;

Calculate the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera;

Get the coordinates X and Y of the touch position;

Receive the input camera instruction;

According to the S, the L, the X, Y, and the camera's screen pixel parameters X1, Y1, calculate the actual focus distance H of the camera;

Record the S, the L, the X, Y, the M, the H and the difference between the M and H on a photograph.

With reference to the first aspect, in the first possible implementation of the first aspect, the calculation of the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera includes:

Obtain the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera;

According to the aperture value of the camera, the light input angle &;

Calculate the current focus distance M of the camera according to formula 1) and formula 2);

Wherein, formula 1) satisfies:

1/u+1/v=1/f

Formula 2) satisfies:

tan&=Y1/2v

Among them, u is the current focus distance M, f is the current zoom factor, v is the image distance, and Y1 is the screen pixel parameter of the camera.

In combination with the first aspect or the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, according to the S, the L, the X, Y, and the According to the screen pixel parameters X1 and Y1 of the camera, the actual focus distance H of the camera is calculated, including:

The actual focus distance H of the camera is calculated by formula 3), where formula 3) satisfies:

$\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1.

In a second aspect, a device for taking pictures is provided, including:

A determining unit, configured to determine the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera;

The first calculation unit is used to calculate the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera;

An acquisition unit, configured to acquire coordinates X and Y of the touch position;

a receiving unit, configured to receive an input photographing instruction;

The second calculation unit is used to calculate and obtain the actual focus of the camera according to the S, the L determined by the determination unit, the X, Y acquired by the acquisition unit, and the screen pixel parameters X1, Y1 of the camera distance H;

a recording unit, configured to record the S determined by the determination unit, the L, the X and Y acquired by the acquisition unit, the M calculated by the first calculation unit, the second calculation unit The calculated H and the difference between M and H are on the photo.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the first computing unit includes:

The obtaining module is used to obtain the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera;

A light-incoming angle calculation module, used to calculate the light-incoming angle according to the aperture value of the camera acquired by the acquisition module;

Calculation module, for calculating the current focus distance M of the camera according to formula 1) and formula 2);

Wherein, formula 1) satisfies:

1/u+1/v=1/f

Formula 2) satisfies:

tan&=Y1/2v

Among them, u is the current focus distance M, f is the current zoom factor, v is the image distance, and Y1 is the screen pixel parameter of the camera.

In combination with the second aspect or the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the second calculation unit calculates the actual focus distance H of the camera through formula 3) , where formula 3) satisfies:

$\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1.

In a third aspect, a camera is provided, and the camera includes the device for taking pictures as described in the second aspect.

In a fourth aspect, a mobile terminal is provided, and the mobile terminal includes the camera as described in the third aspect.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the mobile terminal is a smart phone or a tablet computer.

In the embodiment of the present invention, when taking pictures, the actual size S of the object to be photographed, the distance L between the object to be photographed and the camera, the coordinates X and Y of the focus position, the current focus distance M, the actual focus distance H, and the difference between the current focus distance M and the actual The quality information of the difference between the focusing distance H is on the photos, which can provide some quality information to professional photographers, and provide a basis for professionals to improve the shooting effect of the camera, so as to better adjust the effect of taking pictures and take better pictures. Photo.

Description of drawings

Fig. 1 is the realization flowchart of the method embodiment of taking pictures of the present invention;

Fig. 2 is the structural block diagram of the device embodiment of photographing of the present invention;

Fig. 3 is a structural block diagram of a camera embodiment of the present invention;

Fig. 4 is a structural block diagram of an embodiment of a mobile terminal according to the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiment of the present invention, the actual size S of the object to be photographed, the distance L between the object to be photographed and the camera, the coordinates X and Y of the focus position, the current focus distance M, and the actual focus distance H are firstly obtained. The actual size S, the distance L between the subject and the camera, the coordinates X, Y of the focus position, the current focus distance M, the actual focus distance H, and the difference between the current focus distance M and the actual focus distance H, these quality information are on the photo .

The realization of the present invention is described in detail below in conjunction with specific embodiment:

Embodiment one

Fig. 1 shows the implementation process of the method for taking pictures provided by Embodiment 1 of the present invention, which is described in detail as follows:

In step S101, the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera are determined.

In the embodiment of the present invention, the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera can be obtained through intuitive measurement.

The actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera can also be obtained according to the following method:

Adjust the camera to the preview state, the camera automatically adjusts the zoom, and obtains the size and number of pixels of the photographed image obtained under the current zoom ratio, according to the size and number of pixels of the photographed image obtained under the current zoom ratio and the obtained under the condition of no zoom The size and number of pixels of the photographed image are obtained to obtain the actual size S of the current subject and the distance L between the current subject and the camera.

In step S102, the current focus distance M of the camera is calculated according to the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera.

In the embodiment of the present invention, first obtain the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera, then calculate the angle of light input according to the aperture value of the camera, and finally calculate according to formula 1) and formula 2) Get the current focus distance M of the camera.

Wherein, formula 1) satisfies:

1/u+1/v=1/f Formula 1)

Formula 2) satisfies:

tan&=Y1/2v formula 2)

Among them, u is the current focusing distance M, f is the current zoom factor, v is the image distance, Y1 is the camera’s screen pixel parameter, is the vertical parameter of the camera’s screen pixel, and is the maximum number of vertical pixels of the camera’s screen.

In step S103, coordinates X and Y of the touch position are acquired.

In the embodiment of the present invention, the user touches the focus position displayed on the camera screen, and the camera acquires the coordinates X and Y of the focus position.

In step S104, an input photographing instruction is received.

In the embodiment of the present invention, the user clicks the camera button to start taking pictures, and the camera can start taking pictures after obtaining the taking pictures instruction.

In step S105, the actual focus distance H of the camera is calculated according to the S, the L, the X, Y, and the camera's screen pixel parameters X1, Y1.

In the embodiment of the present invention, the actual focus distance H of the camera can be calculated by formula 3), where formula 3) satisfies:

$h=\sqrt{L^2+{(x_1/Y_1*\sqrt{{(x-x_1/2)}^2+{(Y-Y_1/2)}^2})}^2}$ Formula 3)

Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1.

In step S106, record the S, the L, the X, Y, the M, the H, and the difference between the M and the H on the photo.

In the embodiment of the present invention, the current focus distance M and the actual focus distance H can be calculated according to step S102 and step S104, first calculate the difference between the current focus distance M and the actual focus distance H, and then record the value determined in step S101 The actual size S, the distance L, the coordinates X and Y of the touch position obtained in step S103, the current focus distance M and the actual focus distance H calculated in steps S102 and S104, and the distance between the current focus distance M and the actual focus distance H The difference is in the photo, which can provide some quality information to professional photographers, and provide a basis for professionals to improve the shooting effect of the camera, so as to better adjust the effect of taking pictures and take better photos.

Preferably, the above-mentioned parameter values recorded on the photo can be saved in the storage unit of the camera.

In this embodiment, when taking pictures, record the actual size S of the subject, the distance L between the subject and the camera, the coordinates X, Y of the focus position, the current focus distance M, the actual focus distance H, and the current focus distance M and the actual focus distance The quality information of the difference between H is on the photo, which can provide some quality information for professional photographers, and provide a basis for professionals to improve the shooting effect of the camera, so as to better adjust the effect of taking pictures and take better photos The invention overcomes the problem that the photos taken by the cameras provided by the prior art cannot record the quality information of the photos, so it is inconvenient for professional photographers to adjust the photo effects and take better photos.

It should be understood that in the embodiment of the present invention, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, rather than the implementation process of the embodiment of the present invention. constitute any limitation.

Those of ordinary skill in the art can understand that all or part of the steps in the methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the corresponding program can be stored in a computer-readable storage medium. Media, such as ROM/RAM, magnetic disk or optical disk, etc.

Embodiment two

FIG. 2 shows a specific structural block diagram of the photographing device provided by Embodiment 2 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown. The photographing device 2 may be a software unit, a hardware unit, or a combination of software and hardware built in the camera, and the photographing device 2 includes: a determination unit 21, a first calculation unit 22, an acquisition unit 23, a receiving unit 24, a second Two calculating unit 25 and recording unit 26 .

Wherein, the determining unit 21 is configured to determine the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera;

The first calculation unit 22 is used to calculate the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera;

An acquisition unit 23, configured to acquire coordinates X and Y of the touch position;

A receiving unit 24, configured to receive an input photographing instruction;

The second calculation unit 25 is used to calculate the actual camera's actual value according to the S, the L determined by the determination unit, the X and Y acquired by the acquisition unit, and the camera's screen pixel parameters X1 and Y1. Focusing distance H;

A recording unit 26, configured to record the S determined by the determination unit, the L, the X and Y acquired by the acquisition unit, the M calculated by the first calculation unit, the second calculation The H calculated by the unit and the difference between the M and H are shown on the photo.

Specifically, the first calculation unit 22 includes:

The obtaining module is used to obtain the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera;

A light-incoming angle calculation module, used to calculate the light-incoming angle according to the aperture value of the camera acquired by the acquisition module;

Calculation module, for calculating the current focus distance M of the camera according to formula 1) and formula 2);

Wherein, formula 1) satisfies:

1/u+1/v=1/f

Formula 2) satisfies:

tan&=Y1/2v

Among them, u is the current focus distance M, f is the current zoom factor, v is the image distance, and Y1 is the screen pixel parameter of the camera.

Specifically, the second calculation unit 25 calculates the actual focus distance H of the camera through formula 3), wherein formula 3) satisfies:

$\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1.

The photographing device provided by the embodiment of the present invention can be applied in the aforementioned first corresponding method embodiment. For details, refer to the description of the aforementioned first embodiment, which will not be repeated here.

Embodiment three

FIG. 3 shows a specific structural block diagram of a camera provided by Embodiment 3 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown. The camera 3 may be a software unit, a hardware unit, or a combination of software and hardware built into the mobile terminal. The camera 3 includes the photographing device 2 described in Embodiment 2, and the photographing device 2 includes: a determination unit 21, The first computing unit 22 , the acquiring unit 23 , the receiving unit 24 , the second computing unit 25 and the recording unit 26 .

Wherein, the determining unit 21 is configured to determine the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera;

The first calculation unit 22 is used to calculate the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera;

An acquisition unit 23, configured to acquire coordinates X and Y of the touch position;

A receiving unit 24, configured to receive an input photographing instruction;

The second calculation unit 25 is used to calculate the actual camera's actual value according to the S, the L determined by the determination unit, the X and Y acquired by the acquisition unit, and the camera's screen pixel parameters X1 and Y1. Focusing distance H;

A recording unit 26, configured to record the S determined by the determination unit, the L, the X and Y acquired by the acquisition unit, the M calculated by the first calculation unit, the second calculation The H calculated by the unit and the difference between the M and H are shown on the photo.

Specifically, the first computing unit 22 includes:

The obtaining module is used to obtain the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera;

A light-incoming angle calculation module, used to calculate the light-incoming angle according to the aperture value of the camera acquired by the acquisition module;

Calculation module, for calculating the current focus distance M of the camera according to formula 1) and formula 2);

Wherein, formula 1) satisfies:

1/u+1/v=1/f

Formula 2) satisfies:

tan&=Y1/2v

Among them, u is the current focus distance M, f is the current zoom factor, v is the image distance, and Y1 is the screen pixel parameter of the camera.

Specifically, the second calculation unit 25 calculates the actual focus distance H of the camera through formula 3), wherein formula 3) satisfies:

$\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1.

The camera provided by the embodiment of the present invention can be applied in the foregoing first corresponding method embodiment. For details, refer to the description of the foregoing first embodiment, which will not be repeated here.

Embodiment Four

FIG. 4 shows a specific structural block diagram of a mobile terminal provided by Embodiment 4 of the present invention. For ease of description, only parts related to the embodiment of the present invention are shown. The mobile terminal 4 can be a smart phone or a tablet computer, and includes the camera 3 described in the third embodiment, the camera 3 includes the device 2 for taking pictures described in the second embodiment, and the device 2 for taking pictures includes: a determination unit 21, The first computing unit 22 , the acquiring unit 23 , the receiving unit 24 , the second computing unit 25 and the recording unit 26 .

Wherein, the determining unit 21 is configured to determine the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera;

The first calculation unit 22 is used to calculate the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera;

An acquisition unit 23, configured to acquire coordinates X and Y of the touch position;

A receiving unit 24, configured to receive an input photographing instruction;

The second calculation unit 25 is used to calculate the actual camera's actual value according to the S, the L determined by the determination unit, the X and Y acquired by the acquisition unit, and the camera's screen pixel parameters X1 and Y1. Focusing distance H;

A recording unit 26, configured to record the S determined by the determination unit, the L, the X and Y acquired by the acquisition unit, the M calculated by the first calculation unit, the second calculation The H calculated by the unit and the difference between the M and H are shown on the photo.

Specifically, the first computing unit 22 includes:

The obtaining module is used to obtain the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera;

A light-incoming angle calculation module, used to calculate the light-incoming angle according to the aperture value of the camera acquired by the acquisition module;

Calculation module, for calculating the current focus distance M of the camera according to formula 1) and formula 2);

Wherein, formula 1) satisfies:

1/u+1/v=1/f

Formula 2) satisfies:

tan&=Y1/2v

Among them, u is the current focus distance M, f is the current zoom factor, v is the image distance, and Y1 is the screen pixel parameter of the camera.

Specifically, the second calculation unit 25 calculates the actual focus distance H of the camera through formula 3), wherein formula 3) satisfies:

$\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1.

The mobile terminal provided by the embodiment of the present invention can be applied in the foregoing first corresponding method embodiment. For details, refer to the description of the foregoing first embodiment, which will not be repeated here.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (9)

1. A method for taking pictures, characterized in that, comprising: determining the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera; Calculate the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera; Get the coordinates X and Y of the touch position; Receive the input camera instruction; According to the S, the L, the X, Y, and the camera's screen pixel parameters X1, Y1, calculate the actual focus distance H of the camera; Record the S, the L, the X, Y, the M, the H and the difference between the M and H on a photograph. 2. The method according to claim 1, wherein the calculating the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera comprises: Obtain the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera; According to the aperture value of the camera, the light input angle &; Calculate the current focus distance M of the camera according to formula 1) and formula 2); Wherein, formula 1) satisfies: 1/u+1/v=1/f Formula 2) satisfies: tan&=Y1/2v Among them, u is the current focus distance M, f is the current zoom factor, v is the image distance, and Y1 is the screen pixel parameter of the camera. 3. The method according to claim 1 or 2, characterized in that, according to said S, said L, said X, Y and the screen pixel parameters X1, Y1 of said camera, the actual Focusing distance H, including: The actual focus distance H of the camera is calculated by formula 3), where formula 3) satisfies: $\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$ Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1. 4. A device for taking pictures, characterized in that it comprises: A determining unit, configured to determine the actual size S of the current object to be photographed and the distance L between the current object to be photographed and the camera; The first calculation unit is used to calculate the current focus distance M of the camera according to the current zoom factor of the camera, the aperture value of the camera, and the screen pixel parameter Y1 of the camera; An acquisition unit, configured to acquire coordinates X and Y of the touch position; a receiving unit, configured to receive an input photographing instruction; The second calculation unit is used to calculate and obtain the actual focus of the camera according to the S, the L determined by the determination unit, the X, Y acquired by the acquisition unit, and the screen pixel parameters X1, Y1 of the camera distance H; a recording unit, configured to record the S determined by the determination unit, the L, the X and Y acquired by the acquisition unit, the M calculated by the first calculation unit, the second calculation unit The calculated H and the difference between M and H are on the photo. 5. The device according to claim 4, wherein the first computing unit comprises: The obtaining module is used to obtain the current zoom factor of the camera, the aperture value of the camera and the screen pixel parameter Y1 of the camera; A light-incoming angle calculation module, used to calculate the light-incoming angle according to the aperture value of the camera acquired by the acquisition module; Calculation module, for calculating the current focus distance M of the camera according to formula 1) and formula 2); Wherein, formula 1) satisfies: 1/u+1/v=1/f Formula 2) satisfies: tan&=Y1/2v Among them, u is the current focus distance M, f is the current zoom factor, v is the image distance, and Y1 is the screen pixel parameter of the camera. 6. The device according to claim 4 or 5, wherein the second calculation unit calculates the actual focus distance H of the camera through formula 3), wherein formula 3) satisfies: $\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$ Among them, S is the actual size of the current shooting object, L is the distance between the current shooting object and the camera, X, Y are the coordinates of the focus position, X1, Y1 are the screen pixel parameters of the camera, and are the horizontal parameters and the vertical direction of the screen pixels of the camera The parameters are the maximum number of pixels in the horizontal and vertical directions of the camera's screen, and the actual length and width of the subject are X2 and Y2 respectively, where X2*Y2=S, X2/Y2=X1/Y1. 7. A camera, characterized in that the camera comprises the device for taking pictures according to any one of claims 4 to 6. 8. A mobile terminal, characterized in that the mobile terminal comprises the camera according to claim 7. 9. The mobile terminal according to claim 8, wherein the mobile terminal is a smart phone or a tablet computer.