WO2015180548A1

WO2015180548A1 - Method and device for implementing automatic shooting

Info

Publication number: WO2015180548A1
Application number: PCT/CN2015/077462
Authority: WO
Inventors: 赵蕴泽; 苗雷; 崔小辉
Original assignee: 努比亚技术有限公司
Priority date: 2014-05-30
Filing date: 2015-04-25
Publication date: 2015-12-03
Also published as: CN104125395A; WO2015180609A1

Abstract

The present invention relates to the technical field of digital imaging. Disclosed are a method and device for implementing automatic shooting. The method comprises: displaying the framing preview of a shot object; determining a current depth-of-field option; recognizing and tracking a human face in the framing preview; when the human face is recognized, determining whether a shooting condition satisfies a preset condition of the current depth-of-field option; and if the shooting condition satisfies the preset condition, locking a focal length and starting continuous shooting. By means of the method of the present invention, a recognizing unit is used to recognize the human face in the framing preview, it is determined whether the current shooting condition satisfies the preset condition of the current depth-of-field option according to the selection of the depth-of-field option by a user and the recognized human face, and if yes, the focal length is locked automatically and the continuous shooting is started so as to shoot a group of pictures for the user to choose, and the operations are very convenient.

Description

Method and device for realizing automatic shooting

Technical field

The present invention relates to the field of digital imaging technologies, and in particular, to a method and apparatus for implementing automatic shooting.

Background technique

With the development of digital cameras, image shooting has been popularized and applied in daily life, and people have become accustomed to taking various pictures or images at any time. During the shooting process, you can take pictures or images with different effects by adjusting the camera's parameters. However, for ordinary users, because they do not have professional shooting knowledge, it is difficult to obtain the desired shooting effect by adjusting the parameters of the camera.

In the prior art, the face recognition function can be turned on during the preview of the framing, and the user is prompted when the face is detected to help the user take a clear picture. Although this technology can help users to take clear pictures, but the position of the face changes slightly, it will affect the change of focal length. Although it can be manually focused, this operation is very cumbersome, and if the effect is not appropriate, each time All need to be re-photographed, affecting the user experience.

Summary of the invention

In view of this, the technical problem to be solved by the present invention is to provide a method and apparatus for realizing automatic shooting, which solves the defects that the prior art is cumbersome in the shooting process and affects the user experience.

The technical solution adopted by the present invention to solve the above technical problems is as follows:

According to an aspect of the present invention, a method for realizing automatic shooting is provided, comprising the steps of: displaying a framing preview of a subject; determining a current depth of field option; identifying and tracking a face in the framing preview; When the face is reached, it is determined whether the shooting condition reaches the preset condition of the current depth of field option; if the shooting condition reaches the preset condition, the focal length is locked and continuous shooting is started.

Providing a method as described above, the determining whether the shooting condition reaches a condition preset by the current depth of field option comprises: calculating an area of the area occupied by the recognized face; determining that the area is in the framing preview Whether the proportion is in accordance with the preset ratio in the current depth of field option; if the preset is met The ratio determines the conditions under which the shooting conditions are up to the current depth of field option.

Providing a method as described above, the determining whether the shooting condition reaches a condition preset by the current depth of field option comprises: calculating a distance of the lens from the object according to the recognized face; determining whether the distance meets the current The preset distance in the depth of field option; if the preset distance is met, it is confirmed that the shooting condition reaches the preset condition of the current depth of field option.

Provided is a method as described above, wherein calculating the distance of the lens from the subject includes:

Drive the lens to move and get two pictures;

Compare the two pictures and calculate the sharpness value;

Using the quadratic parabola to calculate the corresponding focal position corresponding to the maximum sharpness;

The distance of the lens from the subject is calculated based on the quasi-focus position.

Providing a method as described above, after the determining whether the shooting condition reaches a condition preset by the current depth of field option, the method further includes: prompting the user if the shooting condition does not reach a preset condition of the current depth of field option Adjust the distance between the lens and the subject.

Provided is a method as described above, after the focus is locked and the continuous shooting is started, the method further comprises: displaying a picture obtained by continuous shooting, prompting the user to select a satisfactory picture; and saving the selected picture after the user makes a selection .

Provided is a method as described above, before the determining a current depth of field option, the method further comprising: setting a current depth of field option according to a user's selection.

According to another aspect of the present invention, there is provided an apparatus for realizing automatic shooting, the apparatus comprising: a display unit configured to display a framing preview of a subject; and a processing unit configured to display a framing preview when the display unit displays Determining a current depth of field option; the identifying unit is configured to identify and track a face in the framing preview when the framing preview is displayed by the display unit; the processing unit is further configured to recognize at the identifying unit In the case of a human face, it is determined whether the shooting condition reaches a condition preset by the current depth of field option; and the photographing unit is configured to lock the focal length and start continuous shooting when the processing unit determines that the shooting condition reaches a preset condition.

Providing an apparatus as described above, wherein the processing unit is further configured to calculate an area of an area occupied by the recognized face, and determine whether the proportion of the area in the framing preview conforms to a current depth of field option The preset ratio, and when the ratio meets the preset ratio, confirm that the shooting condition reaches the preset condition of the current depth of field option.

Providing an apparatus as described above, the processing unit, according to the recognized face, calculating a distance of the lens from the object to be photographed, determining whether the distance meets a preset distance in the current depth of field option, and at the distance When the preset distance is met, confirm that the shooting conditions reach the preset conditions of the current depth of field option.

Provided is a device as described above, wherein the processing unit is further configured to: drive the lens to move, acquire two images; compare the two images to calculate a sharpness value; and use a quadratic parabola to calculate a corresponding standard a focal position; the distance of the lens from the subject is calculated based on the quasi-focus position.

Provided is the apparatus as described above, wherein the processing unit is further configured to prompt the user to adjust a distance between the lens and the object to be photographed when it is determined that the shooting condition does not reach a condition preset by the current depth of field option.

Providing the device as described above, the display unit is further configured to: after the shooting unit starts continuous shooting, display a picture obtained by continuous shooting, prompting the user to select a satisfactory picture; the processing unit is further configured to After the user makes a selection, the selected picture is saved.

There is provided an apparatus as described above, wherein the processing unit sets a current depth of field option according to a user's selection when previewing the scene or turning on the camera.

The method and device for realizing automatic shooting according to the present invention can identify the face in the framing preview, and then determine whether the current shooting condition satisfies the current depth of field according to the user's selection of the depth of field option and the recognized face. The preset condition of the option, if it is satisfied, automatically locks the focal length, starts continuous shooting, and takes a set of pictures for the user to select. If not, the user can be prompted to make corresponding adjustments. Therefore, the user can obtain an image with an ideal shooting effect without repeated focusing, and the operation is very convenient, which improves the user experience.

DRAWINGS

1 is a schematic block diagram of an apparatus for implementing automatic shooting according to an embodiment of the present invention;

Figure 2 is a schematic view of depth of field;

FIG. 3 is a flowchart of a method for implementing automatic shooting according to an embodiment of the present invention;

FIG. 4 is a flowchart of another method for implementing automatic shooting according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in order to make the present invention. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1 , an embodiment of the present invention provides an apparatus for implementing automatic shooting, where the apparatus includes:

The display unit 101 is configured to display a framing preview of the subject.

The processing unit 102 is configured to determine a current depth of field option when the display unit 101 displays the framing preview. Specifically, the current depth of field option can be set by the processing unit 102 according to the user's selection. The depth of field options include: foreground depth, medium depth of field, or deep depth of field, which is selected by the user through the menu when the camera is turned on, or through the menu when previewing is performed.

The recognition unit 103 is configured to recognize and track the face in the framing preview when the display unit 101 displays the framing preview.

At this time, the processing unit 102 is further configured to determine, when the recognition unit 103 recognizes a human face, whether the shooting condition reaches a condition preset by the current depth of field option. Specifically, the processing unit 102 determines whether the current shooting condition reaches a condition preset by the current depth of field option.

Specifically, there is a permissible circle of confusion around the focus, and the distance between the two circles is called the depth of field. Please refer to Figure 2, which is a depth of field diagram, where

Deep prospects:

Back depth:

Depth of field:

δ is the allowable circle diameter, f is the lens focal length, F is the shooting aperture value of the lens, and L is the shooting distance.

It can be seen from the calculation formula of the above depth of field that the depth of field is related to the lens using aperture, lens focal length, shooting distance, and image quality requirements (expressed as the size of the allowable circle of confusion).

Therefore, when the processing unit 102 determines whether the shooting condition reaches the preset condition of the current depth of field option, the processing unit 102 can adopt two methods:

Method 1: Calculate the area of the area occupied by the recognized face, and determine the area in the framing Whether the proportion occupied in the preview conforms to the preset ratio in the current depth of field option, and when the ratio meets the preset ratio, confirm that the shooting condition reaches the preset condition of the current depth of field option;

Method 2, according to the recognized face, after recognizing the face, tracking the face and simultaneously calculating the distance of the lens from the object by using the focusing algorithm, and determining whether the distance meets the preset distance in the current depth of field option, and When the distance meets the preset distance, it is confirmed that the shooting condition reaches a condition preset by the current depth of field option.

When focusing is achieved, the lens can be moved by controlling the motor. First, the motor drives the lens to move a large displacement to obtain two images. Then, the two images are compared frame by frame to calculate the sharpness value, and then the quadratic parabola is used to calculate. The corresponding motor position at the maximum sharpness can also be calculated 2-3 times to calculate the quasi-focal position more accurately. At this time, the second displacement is much smaller than the first displacement, usually only the first 1/3 to 1/4 of the time. Then calculate the distance of the lens from the subject according to the position of the focus.

In a practical application, if the processing unit 102 determines that the shooting condition does not reach the preset condition of the current depth of field option, the user may be prompted to adjust the distance between the lens and the object until the shooting condition reaches the current condition. Depth of field options preset conditions.

The apparatus further includes a photographing unit 104 configured to lock the focal length and initiate continuous shooting when the processing unit 102 determines that the photographing condition reaches a preset condition.

In an actual application, after the shooting unit 104 starts continuous shooting, the display unit 101 may also be configured to display a picture acquired by continuous shooting to prompt the user to select a satisfactory picture, and the processing unit 102 saves the selected after the user makes a selection. Selected picture. At this time, the unselected pictures can be deleted directly to save storage space.

The device for realizing automatic shooting in this embodiment can identify the face in the framing preview by using the recognition unit, and then determine whether the current shooting condition satisfies the current depth of field option according to the user's selection of the depth of field option and the recognized face. The preset condition, if it is satisfied, automatically locks the focal length, starts continuous shooting, and takes a group of pictures to select a total of users. If not, the user can be prompted to make corresponding adjustments. Therefore, the user can obtain an image with an ideal shooting effect without repeated focusing, and the operation is very convenient, which improves the user experience.

The present invention provides a method for implementing automatic shooting based on the above embodiments. Referring to FIG. 3, the method flow includes:

S201. The display unit displays a framing preview of the object to be photographed;

S202. The processing unit determines a current depth of field option.

Specifically, the current depth of field option can be set according to the user's choice, including: foreground depth, medium depth of field, or deep depth of field.

S203. The identification unit identifies and tracks a face in the framing preview.

S204. When the recognition unit recognizes the human face, the processing unit determines whether the shooting condition meets a preset condition of the current depth of field option;

Specifically, determining whether the shooting condition meets the preset condition of the current depth of field option may be performed in the following two ways:

Method 1: Calculate the area of the area occupied by the recognized face;

Determining whether the proportion of the area in the framing preview conforms to a preset ratio in the current depth of field option;

If the preset ratio is met, it is confirmed that the shooting condition reaches the preset condition of the current depth of field option.

Method 2: Calculate the distance of the lens from the object according to the recognized face;

Determining whether the distance meets a preset distance in a current depth of field option;

If the preset distance is met, it is confirmed that the shooting condition reaches the preset condition of the current depth of field option.

S205. If the shooting condition reaches a preset condition, the shooting unit locks the focal length and starts continuous shooting.

The method for realizing automatic shooting in this embodiment can identify the face in the framing preview, and then determine whether the current shooting condition satisfies the current depth of field option preset according to the user's selection of the depth of field option and the recognized face. The condition, if it is satisfied, automatically locks the focal length, starts continuous shooting, and takes a group of pictures. Therefore, the user can obtain an image with an ideal shooting effect without repeated focusing, and the operation is very convenient, which improves the user experience.

Referring to FIG. 4, the present invention provides another method for realizing automatic shooting based on the above two embodiments. The method is exemplified by a device for automatically shooting on a mobile terminal, and the method includes:

S301. When the rear camera of the mobile terminal is turned on, set the current depth of field option to the shallow depth of field option according to the user's selection.

Specifically, in this embodiment, after the user turns on the rear camera, the user selects a shallow depth of field through the menu. Option.

When the user selects the shallow depth of field option, the rear camera needs to be closer to the subject to obtain a shallow depth of field effect. In this embodiment, the distance of the subject from the rear camera is determined by the size of the area occupied by the face in the framing. The preset condition of the shallow depth of field option is the proportion of the area of the face in the framing preview. Because the depth of field is a range value, the preset condition is also a range value, and the specific value is set according to the configuration of the rear camera.

S302. Display a current framing preview.

S303. Identify a face in the framing preview.

S304. Calculate an area of the area occupied by the recognized face.

S305. Determine whether the proportion of the area in the framing preview meets a preset ratio in the current depth of field option. If yes, go to step S307, otherwise step S306.

S306, prompting the user to adjust the distance between the rear camera and the object to be photographed, and executing step S302.

S307, lock the focal length and start continuous shooting.

S308. Display a picture obtained by continuous shooting, and prompt the user to select a satisfactory picture.

S309. Save the selected picture according to the user's selection, and delete the unselected picture.

It should be noted that, in practical applications, even if the subject is in a non-stationary scene, such as shooting a player in a bicycle race, the sporting child can also obtain a better photo through the scheme. For the medium depth option and the deep depth option, the principle is the same as that of the embodiment, and details are not described herein again.

The method for realizing automatic shooting in this embodiment can identify the face in the framing preview, and then determine whether the current shooting condition satisfies the current depth of field option preset according to the user's selection of the depth of field option and the recognized face. The condition, if it is satisfied, automatically locks the focal length, starts continuous shooting, and takes a group of pictures to select a total of users. If not, the user can be prompted to adjust the shooting distance accordingly. Therefore, the user can obtain an image with an ideal shooting effect without repeated focusing, and the operation is very convenient, which improves the user experience.

The preferred embodiments of the present invention have been described above with reference to the drawings, and are not intended to limit the scope of the invention. Any modification or equivalent substitution made by those skilled in the art without departing from the scope and spirit of the invention And improvements are intended to be included within the scope of the invention.

Industrial applicability

The method and device for realizing automatic shooting can identify the face in the framing preview, and then determine whether the current shooting condition satisfies the current depth of field option preset according to the user's selection of the depth of field option and the recognized face. The condition, if it is satisfied, automatically locks the focal length, starts continuous shooting, and takes a group of pictures to select a total of users. If not, the user can be prompted to adjust the shooting distance accordingly. Therefore, the user can obtain a picture with an ideal shooting effect without repeated focusing, and the operation is very convenient and industrially practical.

Claims

A method for realizing automatic shooting, comprising the following steps:

Display a framing preview of the subject;

Determine the current depth of field option;

Identifying and tracking the face in the framing preview;

When the face is recognized, it is determined whether the shooting condition reaches the preset condition of the current depth of field option;

If the shooting condition reaches the preset condition, the focal length is locked and continuous shooting is initiated.
The method for realizing automatic shooting according to claim 1, wherein the determining whether the shooting condition reaches a preset condition of the current depth of field option comprises:

Calculating the area of the area occupied by the recognized face;

Determining whether the proportion of the area in the framing preview conforms to a preset ratio in the current depth of field option;

If the preset ratio is met, it is confirmed that the shooting condition reaches the preset condition of the current depth of field option.
The method for realizing automatic shooting according to claim 1, wherein the determining whether the shooting condition reaches a preset condition of the current depth of field option comprises:

Calculating the distance of the lens from the subject according to the recognized face;

Determining whether the distance meets a preset distance in a current depth of field option;

If the preset distance is met, it is confirmed that the shooting condition reaches the preset condition of the current depth of field option.
The method of realizing automatic shooting according to claim 3, wherein the calculating the distance of the lens from the subject includes calculating a distance of the lens from the subject using a focusing algorithm.
The method of realizing automatic shooting according to claim 3, wherein the calculating the distance of the lens from the object to be photographed comprises:

Drive the lens to move and get two pictures;

Compare the two pictures and calculate the sharpness value;

Using the quadratic parabola to calculate the corresponding focal position corresponding to the maximum sharpness;

The distance of the lens from the subject is calculated based on the quasi-focus position.
The method for realizing automatic shooting according to claim 1, wherein the step of determining whether the shooting condition reaches a condition preset by the current depth of field option further comprises:

Prompting the user to adjust the mirror if the shooting condition does not reach the preset condition of the current depth of field option The distance between the head and the subject.
The method for realizing automatic shooting according to claim 1, wherein the step of locking the focal length and starting the continuous shooting further comprises:

Display the picture obtained by continuous shooting, prompting the user to select a satisfactory picture;

After the user makes a selection, the selected picture is saved.
The method of implementing automatic shooting according to claim 1, wherein the step of determining a current depth of field option further comprises: setting a current depth of field option according to a user's selection.
The method of implementing automatic shooting according to claim 1, wherein the method further comprises: setting a current depth of field option according to a user's selection when the camera is turned on.
The method of implementing automatic shooting according to claim 1, wherein the depth of field option is foreground depth, medium depth of field, or deep depth of field.
A device for realizing automatic shooting, comprising:

a display unit configured to display a framing preview of the subject;

a processing unit configured to determine a current depth of field option when the display unit displays a framing preview;

a recognition unit configured to identify and track a face in the framing preview when the framing preview is displayed by the display unit;

The processing unit is further configured to determine, when the recognition unit recognizes a human face, whether the shooting condition meets a preset condition of the current depth of field option;

The photographing unit is configured to lock the focal length and start continuous shooting when the processing unit determines that the photographing condition reaches a preset condition.
The apparatus for realizing automatic shooting according to claim 11, wherein the processing unit is configured to: calculate an area of an area occupied by the recognized face, and determine whether a ratio of the area in the framing preview is Matches the preset ratio in the current depth of field option, and confirms that the shooting condition reaches the preset condition of the current depth of field option when the ratio meets the preset ratio.
The apparatus for realizing automatic shooting according to claim 11, wherein the processing unit is configured to: calculate a distance of the lens from the object according to the recognized face, and determine whether the distance meets the current depth of field option Set the distance, and when the distance meets the preset distance, confirm that the shooting condition reaches the preset condition of the current depth of field option.
The apparatus for realizing automatic shooting according to claim 13, wherein said processing unit is provided Set to: Use the focus algorithm to calculate the distance of the lens from the subject.
The apparatus for realizing automatic shooting according to claim 13, wherein the processing unit is configured to: drive the lens movement to acquire two pictures; compare the two pictures to calculate a sharpness value; and calculate the sharpness by using a quadratic parabola The maximum focal position corresponding to the target; the distance of the lens from the subject is calculated according to the reference focal position.
The apparatus for realizing automatic shooting according to claim 11, wherein the processing unit is further configured to prompt the user to adjust the lens and be photographed when it is determined that the shooting condition does not reach a condition preset by the current depth of field option. The distance between objects.
The apparatus for realizing automatic shooting according to claim 11, wherein

The display unit is further configured to: after the shooting unit starts continuous shooting, display a picture obtained by continuous shooting, prompting the user to select a satisfactory picture;

The processing unit is further configured to save the selected picture after the user makes a selection.
The apparatus for realizing automatic shooting according to claim 11, wherein the processing unit is further configured to: set a current depth of field option according to a user's selection when the framing preview is performed.
The apparatus for realizing automatic shooting according to claim 11, wherein the processing unit is further configured to set a current depth of field option according to a user's selection when the camera is turned on.
The apparatus for realizing automatic shooting according to claim 11, wherein the depth of field option is foreground depth, medium depth of field or deep depth of field.