CN105657289A - Control method and device and electronic device - Google Patents

Abstract

The invention discloses a control method for controlling an imaging device, and the imaging device includes a synthesis module. In the control method, the face area in the preview image is first identified. Then identify the bright and dark parts of the face area. Then calculate the first contrast value of the light part and the dark part, and calculate a plurality of exposure compensation values according to the first contrast value. Finally, the imaging device is controlled to expose according to the exposure compensation value to obtain multiple material images. The composition module is used to perform HDR processing on multiple material images to obtain a composite image, and the second contrast value of the face area in the composite image is greater than or equal to the first predetermined value. In this way, a composite image is obtained through HDR processing. The overall brightness of the face image of the synthesized image is relatively balanced, the details of each area can be fully displayed, and there is still a certain contrast between the bright and dark parts of the face area, so the face can present a better three-dimensional and realistic sense . The invention also discloses a control device and an electronic device.

Description

Control method, control device and electronic device

technical field

The invention relates to photographing technology, in particular to a control method, a control device and an electronic device.

Background technique

The existing high dynamic range (high dynamic range, HDR) takes multiple frames of images with different exposure times, and then synthesizes the images, so that the bright and dark parts of the synthesized image are properly exposed, so that the details of the bright and dark parts can be presented at the same time. However, using the HDR function may cause other problems. For example, the reduced contrast may make the face less three-dimensional, and it is easy to lose the luster of the skin and highlight too many skin details. The user experience is poor.

Contents of the invention

Embodiments of the present invention aim to solve at least one of the technical problems existing in the prior art. Therefore, the embodiments of the present invention need to provide a control method, a control device and an electronic device.

The present invention provides a control method for controlling an imaging device, and the imaging device includes a synthesis module; the control method includes the following steps:

The first recognition step is to recognize the face area in the preview image;

The second identification step is to identify the bright part and dark part of the human face area;

A first calculation step, calculating a first contrast value between the bright part and the dark part and calculating a plurality of exposure compensation values according to the first contrast value; and

The first control step is to control the imaging device to expose according to the exposure compensation value to obtain multiple material images; the synthesis module is used to perform HDR processing on the multiple material images to obtain a composite image, in which the composite image The second contrast value of the face area is greater than or equal to a first predetermined value.

In this way, the synthesized image is obtained through HDR processing, and at the same time, a certain contrast value is ensured in the face area of the synthesized image. The overall brightness of the face image of the synthesized image is relatively balanced, and the details of each area can be fully displayed, and there is still a certain contrast between the bright and dark parts of the face area, so the face can present a better three-dimensional and realistic sense . Some problems of the prior art are solved.

In some embodiments, the control method includes:

The second calculation step is to calculate the area ratio of the human face area in the preview image; and

The first judging step is judging whether the area proportion is greater than the second threshold and smaller than the first threshold, and if so, enter the second identifying step.

In some embodiments, the control method includes:

The second control step is controlling the imaging device to expose and image when the area ratio is greater than or equal to the first threshold.

In some embodiments, the control method includes:

A third control step is to perform HDR processing according to a third contrast value of the preview image when the area ratio is less than or equal to the second threshold.

In some embodiments, the control method includes:

A second judging step, judging whether the first contrast value is smaller than a second predetermined value; and

The fourth control step is to control the imaging device to expose and form images when the first contrast value is smaller than a second predetermined value.

In some embodiments, the control method includes:

The third calculation step is to calculate the comprehensive brightness of the human face area;

an adjustment step, adjusting exposure according to the integrated brightness so that the integrated brightness of the preview image reaches a predetermined brightness value and obtaining an exposure reference value according to the current exposure, and the exposure compensation value is based on the exposure reference value as a basis; and

The first control step includes a control sub-step, the control sub-step controls the imaging device to expose according to the exposure reference value and the exposure compensation value to obtain the multiple material images.

The present invention also provides a control device for controlling an imaging device, and the imaging device includes a synthesis module; the control device includes:

A first identification module, configured to identify the face area in the preview image;

A second identification module connected to the first identification module, used to identify the bright and dark parts of the face area;

A first calculation module connected to the second identification module, configured to calculate a first contrast value between the bright part and the dark part and calculate a plurality of exposure compensation values according to the first contrast value; and

A first control module connected to the first calculation module, configured to control the exposure of the imaging device according to the exposure compensation value to obtain multiple material images; the synthesis module is used to perform HDR on the multiple material images processing to obtain a composite image, where the second contrast value of the face area in the composite image is greater than or equal to a first predetermined value.

In some embodiments, the control device includes:

The second calculation module is used to calculate the area ratio of the human face area in the preview image; and

The first judging module is used to judge whether the area ratio is greater than the second threshold and smaller than the first threshold; the second identification is used to judge whether the area ratio is smaller than the first threshold and larger than the second threshold Identify the bright part and dark part of the face area in real time;

In some embodiments, the control device includes:

The second control module is configured to control the exposure and imaging of the imaging device when the area ratio is greater than or equal to the first threshold.

In some embodiments, the control device includes:

A third control module, configured to perform HDR processing according to a third contrast value of the preview image when the area ratio is less than or equal to the second threshold.

In some embodiments, the control device includes:

A second judging module, configured to judge whether the first contrast value is smaller than a second predetermined value;

A fourth control module, configured to control the imaging device for exposure and imaging when the first contrast value is less than a second predetermined value.

In some embodiments, the control device includes:

The third calculation module is used to calculate the comprehensive brightness of the human face area; and

An adjustment module, configured to adjust exposure according to the integrated brightness so that the integrated brightness of the preview image reaches a predetermined brightness value and use the current exposure as an exposure reference value, and the exposure compensation value is based on the exposure the benchmark value is the benchmark; and

The first control module includes a control submodule, and the control submodule controls the imaging device to expose according to the exposure reference value and the exposure compensation value to obtain the multiple material images.

The present invention also provides an electronic device, in some embodiments, including an imaging device and the control device described in the above embodiments.

In some embodiments, the electronic device includes a mobile phone or a tablet computer.

In some embodiments, the imaging device includes a front-facing camera of the electronic device or the tablet computer.

Additional aspects and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention.

Description of drawings

The above and/or additional aspects and advantages of embodiments of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a schematic flowchart of a control method according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of functional modules of a control device and an electronic device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the principle of the control method according to the embodiment of the present invention.

Fig. 4 is a schematic diagram of the principle of the control method according to the embodiment of the present invention.

Fig. 5 is a schematic flowchart of a control method according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of functional modules of a control device and an electronic device according to an embodiment of the present invention.

Fig. 7 is a schematic flowchart of a control method in an embodiment of the present invention.

FIG. 8 is a schematic diagram of functional modules of a control device and an electronic device according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of a preview image according to an embodiment of the present invention.

Fig. 10 is a schematic flowchart of a control method in an embodiment of the present invention.

FIG. 11 is a schematic diagram of functional modules of a control device and an electronic device according to an embodiment of the present invention.

Fig. 12 is a schematic diagram of a preview image according to an embodiment of the present invention.

Fig. 13 is a schematic flowchart of a control method in an embodiment of the present invention.

FIG. 14 is a schematic diagram of the functional modules of the control device and the electronic device according to the embodiment of the present invention.

Fig. 15 is a schematic flowchart of a control method in an embodiment of the present invention.

FIG. 16 is a schematic diagram of the functional modules of the control device and the electronic device according to the embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, are only for explaining the embodiments of the present invention, and should not be construed as limiting the embodiments of the present invention.

Referring to FIGS. 1-4 , the control method according to the embodiment of the present invention can be used to control the imaging device 130 , and the imaging device 130 can include a synthesis module 131 . Referring to Figure 1, the control method may include the following steps:

Step S01, identifying the face area 210 in the preview image 200;

Step S02, identifying the bright part 211 and dark part 213 of the face area 210;

Step S03, calculating the first contrast value of the bright part 211 and the dark part 213 and calculating a plurality of exposure compensation values according to the contrast value; and

Step S04 , controlling the imaging device 130 to expose according to the exposure compensation value to obtain a plurality of material images 300 . The composition module 131 is used to perform HDR processing on multiple material images 300 to obtain a composite image 400, and the second contrast value of the face area 210 in the composite image 400 is greater than or equal to the first predetermined value.

Please refer to FIG. 2 , the control method of the embodiment of the present invention can be implemented by the control device 110 of the embodiment of the present invention. The control device 110 may include a first identification module 111 , a second identification module 112 , a first calculation module 113 and a first control module 114 . Step S01 can be implemented by the first identification module 111 , step S02 can be implemented by the second identification module 112 , step S03 can be implemented by the first calculation module 113 , and step S04 can be implemented by the first control module 114 .

That is to say, the first identification module 111 can be used to identify the face area 210 in the preview image 200 . The second identification module 112 can be used to identify the bright part 211 and the dark part 213 of the face area 210 . The first calculation module 113 can be used to calculate the first contrast value of the bright portion 211 and the dark portion 213 and calculate a plurality of exposure compensation values according to the contrast value. The first control module 114 can be used to control the exposure of the imaging device 130 according to the exposure compensation value to obtain a plurality of material images 300 .

The control method or the control device 110 of the embodiment of the present invention can be applied to the electronic device 100 of the embodiment of the present invention.

At present, many mobile phones, tablet computers and other devices that can take pictures are equipped with HDR (high dynamic range) photo taking function. The principle of HDR is to take multiple frames of images with different exposure times, and then synthesize the image 400, so that the bright part 211 and the dark part 213 of the synthesized image 400 are properly exposed, so that the details of the bright part 211 and the dark part 213 can be presented at the same time. However, when using the HDR function, especially for images with human faces, there may be other problems. For example, the reduction of light and dark contrast may make the face on the image less three-dimensional, and it is easy to make the skin lose its luster and highlight too many skin details. etc., poor user experience.

Please refer to FIG. 2 , the preview image 200 refers to the image generated by the image sensor of the imaging device 130 sensing external light before taking a picture, and the data of the image is temporarily stored in the cache. Do not press the camera button to take pictures. In the embodiment of the present invention, the face area 210 of the preview image 200 and the bright portion 211 and the dark portion 213 of the face area 210 are first identified, and then the first contrast value of the bright portion 211 and the dark portion 213 is calculated. The first contrast value can be the absolute value of the difference between the brightness values of the bright part 211 and the dark part 213, for example, the average brightness of the bright part 211 and the dark part 213 are respectively calculated and subtracted.

Then, the exposure compensation value is calculated according to the first contrast value. The limiting condition of the calculation is to ensure that the second contrast value of the face area 210 of the synthesized image 400 obtained after HDR synthesis of the photo obtained by using the above exposure compensation value is greater than or equal to the first predetermined value. value. The second contrast value may be the same as the first contrast value, that is, the brightness difference between the bright part 211 and the dark part 213 of the face area 210 of the synthetic image 400 is calculated using the same calculation method as the first contrast value. The second contrast value must be greater than a first predetermined value, so as to ensure that the bright part 211 and dark part 213 of the human face in the composite image 400 obtained after HDR processing still have a certain contrast, so that the human face still maintains a certain three-dimensional effect, and the composite The image 400 looks more realistic and comfortable.

The unit for measuring the exposure compensation value, the first contrast value and the second contrast value can be eV (ExposureValue). eV is a value that represents the light-passing ability of a photographic lens by combining the shutter speed value and the aperture value. Generally speaking, the higher the eV, the higher the value. The more light entering the imaging device 130 , the brighter the picture taken overall; the lower the eV, the less light entering the imaging device 130 , and the darker the picture taken overall. The exposure compensation value is a relative value to the reference image.

Referring to Fig. 4, for example, the first contrast value of the bright part 211 and the dark part 213 of the face area 210 of the preview image 200 is 4eV, the brightness value of the bright part 211 can be set as 2eV, and the dark part 213 is -2eV (that is, in the middle luminance as a benchmark), with the traditional HDR processing method, it is possible to generate a material image 300 with an exposure compensation value of -2eV in the bright part 211 and a material image 300 with an exposure compensation value of +2eV in the dark part 213, and a benchmark without exposure compensation The material images 310 are combined, so that the luminance values of the original bright part 211 and the original dark part 213 of the face area 210 of the obtained synthetic image 400 will be relatively close.

With the control method of the embodiment of the present invention, it is necessary to ensure that the face area 210 of the synthesized image 400 still has a certain contrast. For example, the first predetermined value is 1eV, and the exposure compensation value of the bright part 211 can be respectively generated as -1.5eV. For the material image 300 whose exposure compensation value of the material image 300 and the dark part 213 is +1.5eV, the brightness of the bright part 211 of the human face area 210 of the synthetic image 400 obtained through HDR processing and synthesis becomes 0.5eV, and the brightness of the dark part 213 is 0.5eV. When it becomes -0.5eV, the bright part 211 and the dark part 213 still have a contrast value of 1eV, which can meet the requirement of being greater than or equal to the first predetermined value. In this way, the overall brightness of the face image in the synthesized image 400 is relatively balanced, and the details of each area can be fully displayed, and there is still a certain contrast value between the bright part 211 and the dark part 213 of the face area 210, so the face can be presented better. Stereoscopic and realistic. The number of material images 300 in the embodiment of the present invention is not limited to 3, and may also be 5, 7, and so on.

Please refer to FIGS. 5-6. In some embodiments, the control method may include: step S05, calculating the area ratio of the face area 210 in the preview image 200; and

Step S06, judging whether the area ratio is greater than the first threshold and smaller than the second threshold, if so, proceed to step S02.

Step S05 can be realized by the second calculating module 115 in some embodiments, and step S06 can be realized by the first judging module 116 in some embodiments. That is to say, the second calculation module 115 is used to calculate the area ratio of the human face area 210 in the preview image 200 . The first judging module 116 is used for judging whether the area proportion is smaller than the first threshold and larger than the second threshold. The second identification module 112 is used for identifying the bright part 211 and the dark part 213 of the face area 210 when the area ratio is smaller than the first threshold and larger than the second threshold.

That is to say, when the ratio of the area of the face area 210 to the entire preview image 200 falls within a certain range, the HDR processing method in the embodiment of the present invention is adopted. In this way, different processing methods are adopted for different situations of each preview image 200 , so that an image more in line with user needs can be obtained.

Referring to Figures 7-9, in this embodiment, the control method may include:

Step S07 , controlling the imaging device 130 to expose and image when the area ratio is greater than or equal to the first threshold.

Step S07 may be implemented by the second control module 117 in some embodiments, that is, the second control module 117 is configured to control the imaging device 130 to expose and image when the area ratio is greater than or equal to the first threshold.

Please refer to FIG. 9 in conjunction, that is to say, if the area ratio of the face area 210 is too large, greater than a first threshold (such as 0.8), or even almost covers the entire preview image 200, HDR synthesis (including traditional HDR processing) will not be performed. mode and the HDR processing mode of the control method of the embodiment of the present invention). Since the synthesized image 400 obtained after HDR processing will more fully display the details of each area, and even highlight too many skin details, which cannot meet the user's aesthetic requirements, so the ordinary exposure method can be used to expose and take photos.

Referring to Figures 10-12, in some embodiments, the control method may include:

Step S08 , when the area ratio is less than or equal to the second threshold, HDR processing is performed according to the third contrast value of the preview image 200 .

Step S08 can be implemented by the third control module 118 of the control device 110 in some embodiments, that is, the third control module 118 can be used to perform HDR processing according to the contrast value of the preview image 200 when the area ratio is less than or equal to the second threshold.

Please refer to FIG. 12 in conjunction, that is to say, if the area ratio of the face area 210 is too small, less than a second threshold (such as 0.04), the face is no longer the subject of the entire preview image 200, and the human body may Or the surrounding scenery is the main body of the preview image 200. People generally do not pay too much attention to the details of the face when viewing or appreciating this image. The third contrast value of 200 is subjected to HDR processing to obtain multiple material images 300 with different exposures, and then HDR synthesis is performed to obtain a composite image 400 . In this way, when the human face is not very conspicuous, more attention is paid to the overall presentation effect of the preview image 200, which meets the user's aesthetic needs, improves the intelligence of the imaging device 130, and improves user experience.

Referring to Figures 13-14, in some embodiments, the control method may include:

Step S09, judging whether the first contrast value is smaller than a second predetermined value; and

Step S10 , controlling the imaging device 130 to expose and image when the first contrast value is smaller than the second predetermined value.

Step S09 can be implemented by using the second judging module 119 of some implementations, and step S10 can be implemented by using the fourth control module 121 of some implementations. That is, the second judging module 119 is used to judge whether the first contrast value is smaller than the second predetermined value. The fourth control module 121 can be used for controlling the exposure and imaging of the imaging device 130 when the first contrast value is smaller than the second predetermined value.

That is to say, if the first contrast value of the face area 210 of the preview image 200 is too small, less than a second predetermined value, it is not necessary to use the HDR processing method of the control method of the embodiment of the present invention for processing. For example, if the second predetermined value is adjusted to 1.3eV, when the first contrast value is less than 1.3eV, it means that the brightness contrast between the bright part 211 and the dark part 213 of the face area 210 is not very strong, and it means that the face in the preview image 200 is stereoscopic. The sense of reality may not be strong in the first place. If HDR processing is performed, it will further weaken its three-dimensional sense and sense of reality, and cause other problems.

Moreover, in the control method of the embodiment of the present invention, the second contrast value of the synthesized image 400 is required to be greater than or equal to the first predetermined value (such as 1eV). Therefore, there is little room for exposure compensation of the material image 300 subjected to HDR processing. In some implementations, the second predetermined value may be the same as the first predetermined value, such as both being 1 eV.

Referring to Figures 15-16, in some embodiments, the control method may include:

Step S11, calculating the integrated brightness of the face area 210; and

Step S12, adjust the exposure according to the integrated brightness so that the integrated brightness of the preview image 200 reaches a predetermined brightness value and obtain an exposure reference value according to the current exposure, and the exposure compensation value is based on the exposure reference value;

Step S04 may include step S0401. Step S0401 controls the imaging device 130 to expose according to the exposure reference value and the exposure compensation value to obtain a plurality of material images 300 .

Step S11 , step S12 and step S0401 can be implemented by the control device 110 in some embodiments. Wherein S11 can be realized by the third calculation module 122 of the control device 110 , step S12 can be realized by the adjustment module 123 of the control device 110 , and step S0401 can be realized by the control sub-module 1141 of the first control module 114 of the control device 110 .

That is, the third calculation module 122 can be used to calculate the comprehensive brightness of the face area 210 . The adjustment module 123 can be used to adjust the exposure according to the integrated brightness so that the integrated brightness of the preview image 200 reaches a predetermined brightness value, and the current exposure is used as the exposure reference value, and the exposure compensation value is based on the exposure reference value. The first control module 114 includes a control sub-module 1141 capable of controlling the sub-module 1141 to control the imaging device 130 to expose according to the exposure reference value and the exposure compensation value to obtain a plurality of material images 300 .

The principle of HDR processing is to use an image with medium brightness as a reference image, and capture an image that is brighter and darker than this image as the material image 300, such as the material image 300 with an exposure compensation value of +2eV and an exposure compensation value of Footage image 300 for -2eV.

Usually, the exposure is adjusted so that the overall brightness of the preview image 200 is 18 shades of gray (ie, neutral gray) and the captured image is used as the reference image. However, in this embodiment, the exposure is not adjusted according to the brightness of the entire preview image 200, but only according to the comprehensive brightness (such as the average brightness) of the human face region 210 so that the overall brightness of the human face region 210 reaches a predetermined brightness value (such as 18 shades of gray). In this way, it is beneficial to improve the look and feel of the face area 210, and helps to meet the aesthetic needs of users, especially selfie users.

The exposure compensation values (+2eV, -2eV, etc.) of other material images 300 are based on the exposure reference value corresponding to this reference material image 310, and then exposed according to the exposure reference value and multiple exposure compensation values to obtain Multiple material images 300, and then HDR synthesis. It can be understood that the brightness of the human face region 210 of the finally obtained synthetic image 400 should fluctuate up and down at a predetermined brightness value (such as 18-degree gray), so that the brightness of the human face region 210 is suitable, which is helpful to satisfy the user's particular needs. It is the aesthetic needs of selfie users.

Please refer to FIG. 2 , the electronic device 100 according to the embodiment of the present invention may include an imaging device 130 and the control device 110 in the above embodiment.

In some embodiments, the electronic device 100 may include a mobile phone or a tablet computer. Wherein, the imaging device 130 may be a front camera of the electronic device 100 or a tablet computer.

Mobile phones or tablet computers are convenient and easy to carry, and are currently widely used camera devices. Moreover, mobile phones or tablet computers are widely equipped with front cameras and rear cameras at the same time. Front cameras are widely used by users to take selfies. For the scenery around the face, it is suitable to use the control method, the control device 110 or the electronic device 100 of the embodiment of the present invention to take pictures at this time.

For other unexpanded parts of the electronic device 100 in the embodiment of the present invention, reference may be made to the corresponding parts of the control device 110 or the control method in the above embodiment, and will not be elaborated here.

In describing the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front ", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiment of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific configuration and operation, and therefore should not be construed as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the embodiments of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a It is a detachable connection, or an integral connection; it can be mechanically connected, it can be electrically connected, or it can communicate with each other; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components or two components interaction relationship. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention according to specific situations.

In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, and may also include the first and second features. The second features are not in direct contact but through another feature between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "below" and "under" the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is less horizontal than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or reference letters in different instances, such repetition is for simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. . In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize the use of other processes and/or the use of other materials.

In the description of this specification, reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples" or "some examples" etc. Specific features, structures, materials, or features described in an embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For use with instruction execution systems, devices, or devices (such as computer-based systems, systems including processors, or other systems that can fetch instructions from instruction execution systems, devices, or devices and execute instructions), or in conjunction with these instruction execution systems, devices or equipment for use. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, since the program can be read, for example, by optically scanning the paper or other medium, followed by editing, interpretation or other suitable processing if necessary. processing to obtain the program electronically and store it in computer memory.

It should be understood that each part of the embodiments of the present invention may be implemented by hardware, software, firmware or a combination thereof. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processor, each unit may physically exist separately, or two or more units may be integrated into a module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (15)

1. A control method, for controlling an imaging device, characterized in that, the imaging device comprises a synthesis module; the control method comprises the following steps: The first recognition step is to recognize the face area in the preview image; The second identification step is to identify the bright part and dark part of the human face area; A first calculation step, calculating a first contrast value between the bright part and the dark part and calculating a plurality of exposure compensation values according to the first contrast value; and The first control step is to control the imaging device to expose according to the exposure compensation value to obtain multiple material images; the synthesis module is used to perform HDR processing on the multiple material images to obtain a composite image, in which the composite image The second contrast value of the face area is greater than or equal to a first predetermined value. 2. The control method according to claim 1, characterized in that, the control method comprises: a second calculation step, calculating the area ratio of the human face area in the preview image; and The first judging step is judging whether the area proportion is greater than the second threshold and smaller than the first threshold, and if so, enter the second identifying step. 3. The control method according to claim 2, characterized in that, the control method comprises: The second control step is controlling the imaging device to expose and image when the area ratio is greater than or equal to the first threshold. 4. control method as claimed in claim 3 is characterized in that, described control method comprises: A third control step is to perform HDR processing according to a third contrast value of the preview image when the area ratio is less than or equal to the second threshold. 5. The control method according to claim 1, characterized in that, the control method comprises: A second judging step, judging whether the first contrast value is smaller than a second predetermined value; and The fourth control step is to control the imaging device to expose and form images when the first contrast value is smaller than a second predetermined value. 6. The control method according to claim 1, characterized in that, the control method comprises: The third calculation step is to calculate the comprehensive brightness of the human face area; an adjustment step, adjusting exposure according to the integrated brightness so that the integrated brightness of the preview image reaches a predetermined brightness value and obtaining an exposure reference value according to the current exposure, and the exposure compensation value is based on the exposure reference value as a basis; and The first control step includes a control sub-step, the control sub-step controls the imaging device to expose according to the exposure reference value and the exposure compensation value to obtain the multiple material images. 7. A control device for controlling an imaging device, characterized in that, the imaging device includes a synthesis module; the control device includes: A first identification module, configured to identify the face area in the preview image; A second identification module connected to the first identification module, used to identify the bright and dark parts of the face area; A first calculation module connected to the second identification module, configured to calculate a first contrast value between the bright part and the dark part and calculate a plurality of exposure compensation values according to the first contrast value; and A first control module connected to the first calculation module, configured to control the exposure of the imaging device according to the exposure compensation value to obtain multiple material images; the synthesis module is used to perform HDR on the multiple material images processing to obtain a composite image, where the second contrast value of the face area in the composite image is greater than or equal to a first predetermined value. 8. The control device according to claim 7, characterized in that, the control device comprises: a second calculation module, configured to calculate the area ratio of the human face area in the preview image; and The first judging module is used to judge whether the area ratio is greater than the second threshold and smaller than the first threshold; the second identification is used to judge whether the area ratio is smaller than the first threshold and larger than the second threshold Identify the bright part and dark part of the face area at the same time. 9. The control device according to claim 8, wherein the control device comprises: The second control module is configured to control the exposure and imaging of the imaging device when the area ratio is greater than or equal to the first threshold. 10. The control device of claim 8, wherein the control device comprises: A third control module, configured to perform HDR processing according to a third contrast value of the preview image when the area ratio is less than or equal to the second threshold. 11. The control device of claim 7, wherein the control device comprises: A second judging module, configured to judge whether the first contrast value is smaller than a second predetermined value; A fourth control module, configured to control the imaging device for exposure and imaging when the first contrast value is less than a second predetermined value. 12. The control device of claim 1, wherein the control device comprises: The third calculation module is used to calculate the comprehensive brightness of the human face area; and An adjustment module, configured to adjust exposure according to the integrated brightness so that the integrated brightness of the preview image reaches a predetermined brightness value and use the current exposure as an exposure reference value, and the exposure compensation value is based on the exposure the benchmark value is the benchmark; and The first control module includes a control submodule, and the control submodule controls the imaging device to expose according to the exposure reference value and the exposure compensation value to obtain the multiple material images. 13. An electronic device, comprising an imaging device and the control device according to any one of claims 7-12. 14. The electronic device according to claim 13, wherein the electronic device comprises a mobile phone or a tablet computer. 15. The electronic device according to claim 14, wherein the imaging device comprises a front camera of the electronic device or the tablet computer.