WO2016119301A1

WO2016119301A1 - Terminal, and image capturing method and device

Info

Publication number: WO2016119301A1
Application number: PCT/CN2015/075559
Authority: WO
Inventors: 康雄
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2015-01-30
Filing date: 2015-03-31
Publication date: 2016-08-04
Also published as: CN104601892A

Abstract

Disclosed are a terminal, and image capturing method and device, for addressing the problem in which image definition cannot be kept while a captured object is enlarged when capturing an image or a video in a current zoom mode, the terminal comprising a first imaging head and a second imaging head. The method comprises: obtaining a focusing parameter of a first preview image received by the current first imaging head, and calculating a focusing angle according to the focusing parameter; adjusting a capturing angle of the second imaging head according to the focusing angle, and controlling the first imaging head and the second imaging head to obtain the image based on the identical view-finding image; calculating similarity of the identical image content comprised in the image obtained by the two imaging heads, and adjusting the capturing angle of the second imaging head according to the similarity obtained by calculation, such that the similarity of the identical image content comprised in the image obtained by the two imaging heads is equal to a preset value; and controlling the second imaging head to capture the image based on a current view-finding range, such that the method improves the definition of the image obtained by capturing.

Description

Terminal, image capturing method and device

This application claims priority to Chinese Patent Application No. 201510050058.1, entitled "A Terminal, Image Shooting Method and Apparatus" on January 30, 2015, the entire contents of which are incorporated herein by reference. In the application.

Technical field

The present invention relates to the field of communications, and in particular, to a terminal, an image capturing method and apparatus.

Background technique

During the shooting of photos or videos, the photographer will use the zoom mode when he wants to get a clearer subject. Most shooting devices use digital zoom to simply enlarge the original image. The principle is that the image data of the captured image is interpolated by an arithmetic unit in the photographing device, thereby magnifying the object in the image to achieve the effect of zooming, that is, the method only enlarges the view image, and the image clarity is not It will change, and even the image will be enlarged, resulting in a decrease in the sharpness of the picture. In addition, in the process of image enlargement, the noise of the image is also significantly enlarged, which seriously affects the quality of the captured image. It can be seen that taking a photo with a conventional zoom method cannot ensure the sharpness of the image while enlarging the subject.

Summary of the invention

The invention provides a terminal, an image capturing method and a device, which are used for solving the problem that the image is captured in the existing zoom mode or the video cannot ensure the sharpness of the image while the subject is enlarged.

According to an aspect of the present invention, there is provided an image capturing method, the terminal comprising a first camera and a second camera, the method comprising: acquiring a focusing parameter of a first preview image received by a current first camera, according to the adjustment The focus parameter calculates a focus angle, calculates a focus angle according to the focus parameter, adjusts a photographing angle of the second camera according to the focus angle, and controls the first camera and the second camera to acquire a second preview image and a third preview image based on the same view image. Calculating a similarity between the second preview image and the same image content included in the third preview image, adjusting a shooting angle of the second camera according to the calculated similarity, and including the second preview image and the third preview image The similarity of the same image content is equal to the preset value, and the second camera is controlled to take an image based on the current viewing range.

The obtaining a focusing parameter of the first preview image received by the current first camera, and calculating the focusing angle according to the focusing parameter, includes: acquiring a central pixel coordinate corresponding to the to-be-focused image area in the first preview image Calculating the orientation and angle of the offset of the center pixel coordinate with respect to the center of the first preview image, and determining the focus angle according to the orientation and angle of the offset of the center pixel coordinate with respect to the center of the first preview image.

Wherein, the second camera is connected to the pan/tilt via the pan-tilt axis, and the pan-tilt is fixedly connected with the terminal, and the shooting angle of the second camera is adjusted according to the focusing angle, including: controlling the pan-tilt axis to drive the second camera to rotate according to the focusing angle, The shooting angle of the second camera is made equal to the focusing angle.

The method further includes: after adjusting the shooting angle of the second camera such that the similarity between the second preview image and the same image content included in the third preview image is equal to the preset value, simultaneously displaying the first preview image and the second Preview the image.

According to another aspect of the present invention, an image capturing apparatus is provided. The terminal includes a first camera and a second camera. The device includes: an acquiring module, configured to acquire a tone of a first preview image received by the current first camera. The focus parameter calculates a focus angle according to the focus parameter; the control module is configured to adjust the photographing angle of the second camera according to the focus angle, and control the first camera and the second camera to obtain the second preview image and the third preview based on the same view image An image capturing module is configured to calculate a similarity between the second preview image and the same image content included in the third preview image, and adjust a shooting angle of the second camera according to the calculated similarity, so that the second preview image and the second preview image The similarity of the same image content included in the three preview images is equal to a preset value, and the second camera is controlled to capture an image based on the current viewing range.

The obtaining module includes: an acquiring unit, configured to acquire a central pixel coordinate corresponding to the to-be-focused image area in the first preview image; and a calculating unit, configured to calculate an orientation of the offset of the central pixel coordinate relative to the center of the first preview image And an angle, the focus angle is determined according to an orientation and an angle of the offset of the center pixel coordinate with respect to the center of the first preview image.

The second camera is connected to the pan/tilt via the pan-tilt shaft, and the pan-tilt is fixedly connected with the terminal. The control module is configured to control the pan-tilt shaft to rotate the second camera according to the focusing angle, so that the shooting angle of the second camera is equal to the adjustment. Focal angle.

Further, the device further includes: a display module, configured to adjust a shooting angle of the second camera such that a similarity between the second preview image and the same image content included in the third preview image is equal to a preset After the value, the first preview image and the second preview image are displayed in synchronization.

According to still another aspect of the present invention, a terminal is provided, including: a terminal includes a first camera and a second camera; and a controller, configured to acquire a focus adjustment parameter of the first preview image currently received by the first camera, according to The focusing parameter calculates a focusing angle; adjusting the shooting angle of the second camera according to the focusing angle, controlling the first camera and the second camera to acquire the second preview image and the third preview image based on the same framing image; calculating the second preview image and the second Comparing the similarity of the same image content included in the preview image, adjusting the shooting angle of the second camera according to the calculated similarity, so that the similarity between the second preview image and the same image content included in the third preview image is equal to the pre- Set a value to control the second camera to capture an image based on the current viewing range.

Wherein, the second camera is connected to the pan/tilt via the pan-tilt rotating shaft, and the pan-tilt is fixedly connected with the terminal, and the pan-tilt drives the second camera to rotate according to the received control signal of the controller, so that the shooting angle of the second camera is equal to the focusing angle.

Wherein, the second camera is provided with a telescope.

According to the technical solution of the present invention, when the focusing parameter is acquired, the shooting angle of the second camera of the terminal is determined according to the focusing parameter, and the same image content is obtained from the preview image acquired by the second camera and the preview image acquired by the first camera. The similarity to continue to adjust the shooting angle of the second camera, improving the sharpness of the image obtained by focusing shooting.

DRAWINGS

1 is a flow chart of a method for image capturing according to Embodiment 1 of the present invention;

2 is an effect diagram of a preview image acquired by two cameras using a terminal according to Embodiment 1 of the present invention;

3 is a schematic diagram of a preview image acquired by a terminal according to Embodiment 2 of the present invention;

4 is a schematic structural view of a camera according to Embodiment 3 of the present invention;

FIG. 5 is a schematic diagram showing the operation of image capturing according to Embodiment 3 of the present invention; FIG.

Fig. 6 is a block diagram showing the configuration of an image pickup apparatus according to a fourth embodiment of the present invention.

detailed description

In order to solve the problem of taking a picture or video with the existing zoom method, you cannot zoom in on the subject. The present invention provides a terminal, an image capturing method and an apparatus. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing an image capturing method according to a first embodiment of the present invention. The method may be applied to a terminal, the terminal includes a first camera and a second camera, and the zoom magnification of the second camera is greater than a zoom factor of the first camera. In this embodiment, the image side of the second camera is used. Set up a telescope to achieve a larger zoom factor. As shown in Figure 1, the method includes the following processing:

Step 101: Acquire a focusing parameter of the first preview image received by the current first camera, and calculate a focusing angle according to the focusing parameter;

The focusing parameter obtained in this step may specifically be a focus signal input by the user based on the input device of the terminal, for example, a focus signal input by touching the display screen input or the focus button.

Specifically, this step can calculate the focusing angle in the following manner:

Obtaining a central pixel coordinate corresponding to the to-be-focused image area in the first preview image, first determining an image area to be focused, which may be a center point pixel coordinate for zooming in a portion of the preview image, if the user inputs through the touch screen Focusing the signal, then obtaining a corresponding center pixel coordinate based on the touch signal input by the user;

Calculating an orientation and an angle of the offset of the center pixel coordinate with respect to the center of the first preview image, and determining the focus according to an orientation and an angle of the offset of the center pixel coordinate with respect to a center of the first preview image angle. Specifically, calculating a vertical offset angle of the center pixel coordinate with respect to the center of the first preview image and a horizontal offset angle, the obtained vertical offset angle and the horizontal offset angle are focus angles; specifically, due to the known image The coordinates of a certain pixel point can calculate the horizontal offset angle and the vertical offset angle of the pixel point coordinate with respect to the center of the image, and the horizontal offset angle corresponding to each pixel point coordinate and the vertical offset can be stored in advance. When the angle is shifted, when the offset angle information corresponding to the coordinates of a certain pixel point needs to be acquired, the pixel point coordinate can be used as an index for searching.

Step 102: Adjust a shooting angle of the second camera according to the focusing angle, and control the first camera and the second camera to acquire the second preview image and the third preview image based on the same framing image;

The second camera in this embodiment may be specifically connected to the pan/tilt via the pan-tilt axis, and the pan-tilt is fixedly connected to the terminal. Based on this, the shooting angle of the second camera is adjusted according to the focus angle, including: The pan head rotation is controlled according to the focus angle to drive the second camera to rotate, so that the shooting angle of the second camera is equal to the focusing angle, and the horizontal offset angle and the vertical offset angle calculated according to step 101.

Step 103: Calculate a similarity between the second preview image and the same image content included in the third preview image, and adjust a shooting angle of the second camera according to the calculated similarity, so that the second preview image and the third preview image are in the second preview image. The similarity of the same image content included is equal to the preset value;

In this step 103, the similarity of the same image content part in the second preview image and the third preview image may be calculated by using the image difference operation in the prior art, and the greater the calculated result, the similarity of the image is illustrated. The lower the degree is, in the case that the calculated similarity reaches the preset similarity value, preferably, the second preview image and the third preview image may be simultaneously displayed on the terminal, and the same display screen may be simultaneously displayed on the same display screen. a second preview image and a third preview image, so that the user can view the contrast effect of the two through the terminal, FIG. 2 is an effect diagram of the preview image acquired by the two cameras of the terminal according to Embodiment 1 of the present invention, from the figure It can be seen that the subject obtained by the focus image area of the second preview image is clearer.

Step 104: Control the second camera to capture an image based on the current viewing range.

The embodiment of the invention realizes the function of amplifying a part of the photographed picture by a common camera and a rotatable camera, and improves the sharpness of the enlarged image.

Example 2

This embodiment is the same as the basic implementation principle of the foregoing Embodiment 1. The image capturing method provided by the present invention is described in detail below by disclosing more technical details. It should be noted that the present embodiment is only a preferred embodiment of the present invention. The embodiments are not intended to limit the invention.

The image capturing method of this embodiment may specifically include the following processing:

A camera of the terminal works normally to realize normal preview/photo/recording functions;

3 is a schematic diagram of a preview image acquired by a terminal according to Embodiment 2 of the present invention. During a preview process, a zoom request of a user is detected by an input device, and a pixel point coordinate corresponding to a specific position that needs to be enlarged is acquired (x, y ), as shown in FIG. 3, calculating an offset angle of m(x, y) with respect to a center point of the preview image, wherein the vertical angle can be calculated according to m(x, y) and the total size (W, H) of the image, Specifically, the calculation can be performed by using α=arctan((W/2-x)/(H/2)-y), wherein A and B are images obtained by photographing the subject using the second camera and the first camera, and the level is The offset angle needs to be calculated according to an index of a predetermined offset radius and a horizontal offset angle. Preferably, Obtaining the horizontal offset angle and the vertical offset angle corresponding to the pixel point m according to the manner described in the first embodiment, the correspondence between the pixel point coordinates and the offset angle is specifically determined in the first embodiment. Introduced, not repeated here.

The pan/tilt is adjusted according to the obtained horizontal offset angle and the vertical offset angle, so that the second camera is aimed at the target shooting area, and the second camera preview function is turned on to display the preview image acquired by the second camera.

Comparing the similarity between the image of the region near the m(x, y) of the first camera and the preview image of the second camera by the image similarity comparison module, and fine-tuning the pan/tilt until the value of the similarity reaches a preset value, stopping the gimbal mobile.

Simultaneously display the preview of the first camera and the preview image of the second camera to view the zoom shooting effect.

Example 3

The embodiment provides a terminal, the terminal includes the following components: a first camera and a second camera, the second camera is rotatably connected to the terminal, and the controller is configured to acquire the first preview image currently received by the first camera. Focusing parameter, calculating a focusing angle according to the focusing parameter; adjusting a shooting angle of the second camera according to the focusing angle, controlling the first camera and the second camera to acquire the second preview image and the third preview image based on the same view image; Comparing the similarity between the preview image and the same image content included in the third preview image, adjusting the shooting angle of the second camera according to the calculated similarity, so that the second preview image is similar to the same image content included in the third preview image The degree is equal to the preset value, and the second camera is controlled to capture an image based on the current viewing range, wherein the relationship between the components is as follows: the first camera and the second camera are fixed on the terminal by the fixed base, and the two are placed side by side on the fixed base. Camera, one of which is fixed and the other fixed by the gimbal The base is equipped with a telescope-effect lens. The power interface, data transmission interface and pan/tilt control interface of the two cameras are reserved on the base to facilitate docking with other devices, and the movement of the pan/tilt shaft is adjusted through the pan/tilt control interface. , you can control the angle of the second camera.

The terminal may further include a device for displaying an image, such as a display screen or the like, and a device for acquiring input information, such as a mouse, a keyboard, a touch screen, and the like.

4 is a schematic structural view of a camera according to Embodiment 3 of the present invention. As shown in Figure 4, the second camera is connected to the pan/tilt via the pan-tilt shaft, and the pan-tilt is fixedly connected to the terminal, and the pan-tilt is controlled according to the received controller. The signal driving the second camera to rotate, so that the shooting angle of the second camera is equal to the focusing angle, wherein the second camera is provided with a telephoto camera, so that the user can see a clear and enlarged preview image, the first camera and The second camera can be connected to the terminal through a fixed base.

FIG. 5 is a schematic diagram of a working principle of taking a picture using a terminal according to Embodiment 3 of the present invention. As shown in FIG. 5, the processor is responsible for receiving image data of the dual camera and simultaneously displaying it in the display module, and simultaneously controlling the camera through the interface. status. The processor can control the rotation of the gimbal through the pan/tilt control interface. The user interacts with the processor through the input device to send instructions such as focusing. An image similarity comparison module is integrated in the processor, and the module may be an image processing related hardware device or a software simulation module for measuring the similarity between the two images.

Example 4

Embodiment 4 of the present invention provides an image capturing device, which may be used to implement the image capturing method described above, and the device may specifically be a functional module in the terminal.

6 is a block diagram showing the structure of an image capturing apparatus according to Embodiment 4 of the present invention. The apparatus can be applied to a photographing terminal. The photographing terminal includes a first camera and a second camera. As shown in FIG. 6, the apparatus 50 includes the following components:

The obtaining module 51 is configured to acquire a focusing parameter of the first preview image received by the current first camera, and calculate a focusing angle according to the focusing parameter;

The control module 52 is configured to adjust a shooting angle of the second camera according to the focusing angle, and control the first camera and the second camera to acquire the second preview image and the third preview image based on the same framing image;

The photographing module 53 is configured to calculate a similarity between the second preview image and the same image content included in the third preview image, and adjust a photographing angle of the second camera according to the calculated similarity, so that the second preview image and the third preview image The similarity of the same image content contained in the preview image is equal to a preset value; controlling the second camera to capture an image based on the current viewing range.

The obtaining module 51 may specifically include the following components:

An acquiring unit, configured to acquire a central pixel coordinate corresponding to the to-be-focused image area in the first preview image;

a calculating unit, configured to calculate an orientation and an angle of the offset of the central pixel coordinate with respect to the center of the first preview image, according to an offset of the central pixel coordinate with respect to a center of the first preview image The orientation and angle determine the focus angle. Specifically, the vertical offset angle of the center pixel coordinate with respect to the center of the first preview image and the horizontal offset angle may be calculated, and the obtained vertical offset angle and the horizontal offset angle are the focus angles.

Further, the device further includes: a display module, configured to: after adjusting a shooting angle of the second camera, so that the similarity between the second preview image and the same image content included in the third preview image is equal to a preset value, A preview image and a second preview image.

While the preferred embodiments of the present invention have been disclosed for purposes of illustration, those skilled in the art will recognize that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.

Claims

An image capturing method, wherein the terminal comprises a first camera and a second camera, the method comprising:

Obtaining a focusing parameter of the first preview image received by the current first camera, and calculating a focusing angle according to the focusing parameter;

Adjusting a shooting angle of the second camera according to the focusing angle, and controlling the first camera and the second camera to acquire a second preview image and a third preview image based on the same framing image;

Calculating a similarity between the second preview image and the same image content included in the third preview image, and adjusting a shooting angle of the second camera according to the calculated similarity, so that the second preview image is The similarity of the same image content included in the third preview image is equal to a preset value, and the second camera is controlled to capture an image based on the current viewing range.
The method of claim 1, wherein the acquiring a focus parameter of the first preview image received by the current first camera, and calculating the focus angle according to the focus parameter comprises:

Obtaining a central pixel coordinate corresponding to the to-be-focused image area in the first preview image;

Calculating an orientation and an angle of the offset of the center pixel coordinate with respect to the center of the first preview image, and determining the focus according to an orientation and an angle of the offset of the center pixel coordinate with respect to a center of the first preview image angle.
The method according to claim 1, wherein the second camera is connected to the pan/tilt head through a pan-tilt axis, the pan-tilt is fixedly connected to the terminal, and the second camera is adjusted according to the focus angle The shooting angle includes:

Controlling, by the focusing angle, the pan/tilt axis to rotate the second camera, so that a shooting angle of the second camera is equal to the focusing angle.
The method according to any one of claims 1 to 3, wherein the second camera comprises a telescope, the method further comprising:

After adjusting the shooting angle of the second camera such that the similarity between the second preview image and the same image content included in the third preview image is equal to a preset value, the first preview image and the The second preview image is described.
An image capturing device, wherein the terminal comprises a first camera and a second a camera, the device comprising:

An acquiring module, configured to acquire a focusing parameter of the first preview image received by the current first camera, and calculate a focusing angle according to the focusing parameter;

a control module, configured to adjust a shooting angle of the second camera according to the focus angle, and control the first camera and the second camera to acquire a second preview image and a third preview image based on the same view image;

a photographing module, configured to calculate a similarity between the second preview image and the same image content included in the third preview image, and adjust a shooting angle of the second camera according to the calculated similarity, so that the The similarity between the second preview image and the same image content included in the third preview image is equal to a preset value, and the second camera is controlled to capture an image based on the current framing range.
The device of claim 5, wherein the obtaining module comprises:

An acquiring unit, configured to acquire a central pixel coordinate corresponding to the to-be-focused image area in the first preview image;

a calculating unit, configured to calculate an orientation and an angle of the offset of the central pixel coordinate with respect to the center of the first preview image, according to an orientation and an angle of the center pixel coordinate with respect to an offset of the first preview image center The focus angle is determined.
The device according to claim 5 or 6, wherein the second camera is connected to the cloud platform through a pan-tilt shaft, the pan-tilt is fixedly connected to the terminal, and the control module is configured to adjust the focus according to the An angle control of the pan/tilt axis drives the second camera to rotate, so that a shooting angle of the second camera is equal to the focusing angle.
The device according to any one of claims 5 to 7, wherein the second camera comprises a telescope, the device further comprising:

a display module, configured to: after adjusting a shooting angle of the second camera, so that a similarity between the second preview image and the same image content included in the third preview image is equal to a preset value, A preview image and the second preview image.
A terminal, comprising:

The terminal includes a first camera and a second camera;

a controller, configured to acquire a focusing parameter of the first preview image currently received by the first camera, and calculate a focusing angle according to the focusing parameter;

Adjusting a shooting angle of the second camera according to the focusing angle, and controlling the first camera and the second camera to acquire a second preview image and a third preview image based on the same framing image;

Calculating a similarity between the second preview image and the same image content included in the third preview image, and adjusting a shooting angle of the second camera according to the calculated similarity, so that the second preview image is The similarity of the same image content included in the third preview image is equal to a preset value, and the second camera is controlled to capture an image based on the current viewing range.
The terminal according to claim 9, wherein the second camera is connected to the cloud platform through a pan-tilt axis, and the pan-tilt is fixedly connected to the terminal, and the pan-tilt is driven according to a control signal of the received controller. The second camera is rotated such that a shooting angle of the second camera is equal to the focusing angle.
The terminal according to claim 9 or 10, characterized in that the second camera is provided with a telescope.