WO2017020382A1 - 拍照控制方法、拍照控制装置及终端 - Google Patents

拍照控制方法、拍照控制装置及终端 Download PDF

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WO2017020382A1
WO2017020382A1 PCT/CN2015/088480 CN2015088480W WO2017020382A1 WO 2017020382 A1 WO2017020382 A1 WO 2017020382A1 CN 2015088480 W CN2015088480 W CN 2015088480W WO 2017020382 A1 WO2017020382 A1 WO 2017020382A1
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current scene
camera
mode
black
photographing
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PCT/CN2015/088480
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English (en)
French (fr)
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张旭
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宇龙计算机通信科技(深圳)有限公司
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Publication of WO2017020382A1 publication Critical patent/WO2017020382A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene

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  • the present invention relates to the field of terminal technologies, and in particular, to a photographing control method, a photographing control device, and a terminal.
  • digital cameras of different precision have been integrated on many electronic devices.
  • digital cameras are mostly integrated in notebook computers, and digital cameras are integrated into digital cameras or tablets in personal digital assistants and smart phones.
  • the backlighting scene detection is often performed during the photographing process.
  • the backlighting scene detection can generally be implemented by hardware and software. Although the backlighting scene can be detected, there are still some shortcomings:
  • sensors are generally used for detection, but the cost of the sensor is relatively high;
  • the invention is based on at least one of the above technical problems, and proposes a new camera control party.
  • the back light detection is carried out, the influence of the color cast light is effectively avoided, the accuracy of the backlight detection in the photographing process is improved, the practicality of the back light detection is enhanced, and the photographing effect is optimized, thereby improving The user experience.
  • the present invention provides a photographing control method, including: when receiving a photographing instruction of a user, acquiring a black and white preview image of a current scene through a first camera of the terminal; and analyzing the black and white preview image, The target camera mode of the second camera of the terminal is turned on according to the detection result, so that the current scene is photographed in the target photographing mode, wherein the second camera is used for Take a color picture.
  • the first camera of the terminal acquires a black and white preview image of the current scene, and analyzes the black and white preview image to detect whether the current scene is backlit.
  • the black and white preview image is acquired, When analyzing the black and white preview picture, it is not affected by the color cast light, and is not easily affected by the quality of the camera. It effectively improves the accuracy of backlight detection during the photographing process, and enhances the practicability of backlight detection.
  • the detection result turns on the target camera mode of the second camera of the terminal, so as to take a picture of the current scene in the target photographing mode, thereby optimizing the photographing effect and improving the user experience.
  • the step of analyzing the black and white preview image to detect whether the current scene is backlit includes: analyzing the black and white preview image to obtain brightness information of the current scene. Generating a luminance histogram of the current scene according to the brightness information; determining a backlight detection parameter of the current scene according to the preset backlight detection algorithm and the brightness histogram, according to a threshold range in which the backlight detection parameter is located Determining whether the current scene is backlit; and the backlight detection parameter comprises: a standard deviation of the luminance histogram, a proportion of light of the black and white preview picture, a proportion of dark light, and a proportion of strong light.
  • the black and white preview picture is analyzed to obtain the brightness information of the current scene, and the black and white preview picture is white light transmitted through the lens during the acquisition process, so that the obtained brightness information is not subject to the color light.
  • the effect of effectively avoiding the large deviation of the subsequent analysis process due to the inaccuracy of the obtained brightness information improves the accuracy of the backlight detection during the photographing process.
  • the target photographing mode includes: an HDR mode or a preset mode.
  • the HDR (High Dynamic Range) mode is a photographing mode that can provide more dynamic range and image details
  • the preset mode is any one of the user-preset HDR modes.
  • the camera mode or the default camera mode of the terminal such as the fully automatic mode, the landscape mode, and the like.
  • the step of opening a target photographing mode of the second camera of the terminal according to the detection result to photograph the current scene in the target photographing mode comprises: if detecting Turning on the HDR mode of the second camera to view the current scene in the HDR mode; if the current scene is not backlit, the preset mode of the second camera is turned on. And taking a picture of the current scene in the preset mode.
  • the HDR mode or the preset mode is automatically turned on by the detection result to take a picture of the current scene, thereby avoiding the user's own manual operation and improving the user experience; and simultaneously turning on the HDR of the second camera in the backlight scene.
  • the mode makes it possible to compensate for the defects of backlighting through the HDR mode, thereby optimizing the photographing effect.
  • the method further includes: detecting whether the Turning on the back light detection command of the user; when determining that the open backlight detection instruction is not received, triggering the second camera to take a picture of the current scene; when determining to receive the open backlight detection instruction, And performing the step of acquiring a black and white preview picture of the current scene by using the first camera of the terminal.
  • a photographing control apparatus comprising: an obtaining unit, configured to acquire a black and white preview image of a current scene through a first camera of the terminal when receiving a photographing instruction of the user; a detecting unit, configured to analyze the black and white preview image to detect whether the current scene is backlit; and a processing unit, configured to open the end according to the detection result a target photographing mode of the second camera of the end to photograph the current scene in the target photographing mode, wherein the second camera is used to take a color picture
  • the first camera of the terminal acquires a black and white preview image of the current scene, and analyzes the black and white preview image to detect whether the current scene is backlit.
  • the black and white preview image is acquired, When analyzing the black and white preview picture, it is not affected by the color cast light, and is not easily affected by the quality of the camera. It effectively improves the accuracy of backlight detection during the photographing process, and enhances the practicability of backlight detection.
  • the detection result turns on the target camera mode of the second camera of the terminal, so as to take a picture of the current scene in the target photographing mode, thereby optimizing the photographing effect and improving the user experience.
  • the first detecting unit is configured to: analyze the black and white preview image to obtain brightness information of the current scene; and generate brightness of the current scene according to the brightness information. a histogram; determining a backlight detection parameter of the current scene according to the preset backlight detection algorithm and the luminance histogram to determine whether the current scene is backlit according to a threshold range in which the backlight detection parameter is located; and the backlight detection
  • the parameters include: a standard deviation of the luminance histogram, a proportion of light of the black and white preview picture, a proportion of dark light, and a proportion of strong light.
  • the black and white preview picture is analyzed to obtain the brightness information of the current scene, and the black and white preview picture is white light transmitted through the lens during the acquisition process, so that the obtained brightness information is not subject to the color light.
  • the effect of effectively avoiding the large deviation of the subsequent analysis process due to the inaccuracy of the obtained brightness information improves the accuracy of the backlight detection during the photographing process.
  • the target photographing mode includes: an HDR mode or a preset mode.
  • the HDR (High Dynamic Range) mode is a photographing mode that can provide more dynamic range and image details
  • the preset mode is any one of the user-preset HDR modes.
  • the camera mode or the default camera mode of the terminal such as the fully automatic mode, the landscape mode, and the like.
  • the processing unit is configured to: if the first detecting unit detects the current scene backlighting, turn on the HDR mode of the second camera, Taking a picture of the current scene in the HDR mode; if the first detecting unit detects that the current scene is not backlit, turning on the preset mode of the second camera to be in the preset mode The current scene is photographed.
  • the HDR mode or the preset mode is automatically turned on by the detection result to take a picture of the current scene, thereby avoiding the user's own manual operation and improving the user experience; and simultaneously turning on the HDR of the second camera in the backlight scene.
  • the mode makes it possible to compensate for the defects of backlighting through the HDR mode, thereby optimizing the photographing effect.
  • the method further includes: a second detecting unit, configured to detect whether an open backlight detection instruction from the user is received; the processing unit is further configured to: determine that the open backlight is not received When the command is detected, the second camera is triggered to take a picture of the current scene; when it is determined that the open backlight detection instruction is received, the first camera that is used by the terminal is configured to obtain a black and white preview of the current scene. The steps of the picture.
  • a terminal comprising: the photographing control device according to any one of the above aspects. Therefore, the terminal has the same technical effects as the photographing control device according to any one of the above technical solutions, and details are not described herein again.
  • the backlight detection is performed based on the analysis of the acquired black and white preview picture, effectively avoiding the influence of the color cast light, improving the accuracy of the backlight detection during the photographing process, optimizing the photographing effect, thereby improving the user experience. .
  • FIG. 1 shows a schematic flow chart of a photographing control method according to an embodiment of the present invention
  • Figure 2 shows a schematic block diagram of a photographing control device in accordance with one embodiment of the present invention
  • FIG. 3 is a block diagram showing the structure of a terminal according to an embodiment of the present invention.
  • FIG. 4 shows a schematic block diagram of a photographing control system according to an embodiment of the present invention.
  • FIG. 5 shows a schematic flow chart of a backlight detection method according to an embodiment of the present invention
  • Fig. 6 shows a schematic flow chart of a control method for the photographing control system of Fig. 4.
  • FIG. 1 shows a schematic flow chart of a photographing control method according to an embodiment of the present invention.
  • a photographing control method includes: Step 102: When receiving a photographing instruction of a user, acquiring a black and white preview image of a current scene by using a first camera of the terminal; And analyzing the black and white preview image to detect whether the current scene is backlit; in step 106, turning on a target photographing mode of the second camera of the terminal according to the detection result, to view the current in the target photographing mode.
  • the scene is photographed, wherein the second camera is used to take a color picture
  • the first camera of the terminal acquires a black and white preview image of the current scene, and analyzes the black and white preview image to detect whether the current scene is backlit.
  • the black and white preview image is acquired, When analyzing the black and white preview picture, it is not affected by the color cast light, and is not easily affected by the quality of the camera. It effectively improves the accuracy of backlight detection during the photographing process, and enhances the practicability of backlight detection.
  • the detection result turns on the target camera mode of the second camera of the terminal, so as to take a picture of the current scene in the target photographing mode, thereby optimizing the photographing effect and improving the user experience.
  • the step of analyzing the black and white preview image to detect whether the current scene is backlit includes: analyzing the black and white preview image to obtain brightness information of the current scene. Generating a luminance histogram of the current scene according to the brightness information; determining the current scene according to a preset backlight detection algorithm and the brightness histogram a backlight detection parameter for determining whether the current scene is backlit according to a threshold range in which the backlight detection parameter is located; and the backlight detection parameter comprises: a standard deviation of the luminance histogram, and a brightness of the black and white preview image Ratio, proportion of dark light and proportion of glare.
  • the black and white preview picture is analyzed to obtain the brightness information of the current scene, and the black and white preview picture is white light transmitted through the lens during the acquisition process, so that the obtained brightness information is not subject to the color light.
  • the effect of effectively avoiding the large deviation of the subsequent analysis process due to the inaccuracy of the obtained brightness information improves the accuracy of the backlight detection during the photographing process.
  • the target photographing mode includes: an HDR mode or a preset mode.
  • the HDR (High Dynamic Range) mode is a photographing mode that can provide more dynamic range and image details
  • the preset mode is any one of the user-preset HDR modes.
  • the camera mode or the default camera mode of the terminal such as the fully automatic mode, the landscape mode, and the like.
  • the step of opening a target photographing mode of the second camera of the terminal according to the detection result to photograph the current scene in the target photographing mode comprises: if detecting Turning on the HDR mode of the second camera to view the current scene in the HDR mode; if the current scene is not backlit, the preset mode of the second camera is turned on. And taking a picture of the current scene in the preset mode.
  • the HDR mode or the preset mode is automatically turned on by the detection result to take a picture of the current scene, thereby avoiding the user's own manual operation and improving the user experience; and simultaneously turning on the HDR of the second camera in the backlight scene.
  • the mode makes it possible to compensate for the defects of backlighting through the HDR mode, thereby optimizing the photographing effect.
  • the method further includes: detecting whether the Turning on the back light detection command of the user; when determining that the open backlight detection instruction is not received, triggering the second camera to take a picture of the current scene; when determining to receive the open backlight detection instruction, Then perform the pass The step of the first camera of the terminal acquiring a black and white preview picture of the current scene.
  • Fig. 2 shows a schematic block diagram of a photographing control apparatus according to an embodiment of the present invention.
  • the photographing control apparatus 200 includes: an obtaining unit 202, configured to acquire a black and white preview of a current scene by using a first camera of the terminal when receiving a photographing instruction of a user. a first detecting unit 204, configured to analyze the black and white preview image to detect whether the current scene is backlit; and the processing unit 206 is configured to start a target photographing mode of the second camera of the terminal according to the detection result, to The current scene is photographed in the target photographing mode, wherein the second camera is used to take a color picture
  • the first camera of the terminal acquires a black and white preview image of the current scene, and analyzes the black and white preview image to detect whether the current scene is backlit.
  • the black and white preview image is acquired, When analyzing the black and white preview picture, it is not affected by the color cast light, and is not easily affected by the quality of the camera. It effectively improves the accuracy of backlight detection during the photographing process, and enhances the practicability of backlight detection.
  • the detection result turns on the target camera mode of the second camera of the terminal, so as to take a picture of the current scene in the target photographing mode, thereby optimizing the photographing effect and improving the user experience.
  • the first detecting unit 204 is specifically configured to: analyze the black and white preview image to obtain brightness information of the current scene; and generate the current scene according to the brightness information. a luminance histogram; determining, according to the preset backlight detection algorithm and the luminance histogram, a backlight detection parameter of the current scene, to determine whether the current scene is backlit according to a threshold range in which the backlight detection parameter is located; and the backlight
  • the detection parameters include: a standard deviation of the luminance histogram, a proportion of light of the black and white preview picture, a proportion of dark light, and a proportion of strong light.
  • the black and white preview picture is analyzed to obtain the brightness information of the current scene, and the black and white preview picture is in the process of obtaining, and the white light is transmitted through the lens, so that The acquired brightness information is not affected by the color cast light, which effectively avoids the problem that the subsequent analysis process is greatly deviated due to the inaccuracy of the acquired brightness information, and improves the accuracy of the backlight detection in the photographing process.
  • the target photographing mode includes: an HDR mode or a preset mode.
  • the HDR (High Dynamic Range) mode is a photographing mode that can provide more dynamic range and image details
  • the preset mode is any one of the user-preset HDR modes.
  • the camera mode or the default camera mode of the terminal such as the fully automatic mode, the landscape mode, and the like.
  • the processing unit 206 is specifically configured to: if the first detecting unit 204 detects the current scene backlighting, turn on the HDR mode of the second camera to The current scene is photographed in the mode; if the first detecting unit 204 detects that the current scene is not backlit, the preset mode of the second camera is turned on to view the current scene in the preset mode. Take a photo.
  • the HDR mode or the preset mode is automatically turned on by the detection result to take a picture of the current scene, thereby avoiding the user's own manual operation and improving the user experience; and simultaneously turning on the HDR of the second camera in the backlight scene.
  • the mode makes it possible to compensate for the defects of backlighting through the HDR mode, thereby optimizing the photographing effect.
  • the method further includes: a second detecting unit 208, configured to detect whether an open backlight detection instruction from the user is received; the processing unit 206 is further configured to: after determining that the When the backlight detection command is turned on, the second camera is triggered to take a picture of the current scene; when it is determined that the opening backlight detection instruction is received, the first camera that is used by the terminal acquires the current scene. The steps to preview the picture in black and white.
  • FIG. 3 shows a schematic block diagram of a structure of a terminal in accordance with one embodiment of the present invention.
  • a terminal 300 includes: The photographing control device 200 is shown. Therefore, the terminal 300 has the same technical effects as the photographing control device 200 shown in FIG. 2, and details are not described herein again.
  • Image acquisition equipment including cameras, mobile phones, etc., when capturing images with strong light sources such as the sun, the photographs are often too contrasted, losing a lot of image details, and the photo color information is very lost.
  • image acquisition equipment including cameras, mobile phones, etc.
  • the photographing control system includes a setting module 402, a dual camera module 404, and a coordination mechanism module 406, wherein the setting module 402 is configured. It is used to set the opening and closing of the backlight detection function; the dual camera module 404 is configured to perform image collection by a black and white camera and a color camera; and the cooperation mechanism module 406 is configured to perform backlight detection to start/close the HDR according to the detection result. mode.
  • the backlight detection method includes the following steps:
  • Step 502 Obtain a black and white preview image of the current scene by using a black and white camera, and obtain brightness information of the current scene based on the black and white preview image.
  • Step 504 Count a luminance histogram corresponding to the brightness information of the current scene.
  • step 506 the mean and standard deviation of the luminance histogram are calculated.
  • Step 508 Determine a backlight detection parameter of the current scene according to the preset backlight detection algorithm and the luminance histogram.
  • the backlight detection parameters include a standard deviation of the luminance histogram, a proportion of the brightness of the black and white preview picture, a proportion of the dark light, and a proportion of the strong light.
  • Step 510 Determine whether the current scene is backlit according to a threshold range in which the backlight detection parameter is located. Specifically, when the standard deviation of the luminance histogram is greater than the first threshold, the dark light ratio is greater than the second threshold and less than the third threshold, and the luminance ratio is greater than the fourth threshold, and/or when the standard deviation of the luminance histogram is greater than When the first threshold is greater than the fifth threshold, the current scene is determined to be backlit; otherwise, the current scene is determined to be non-backlighting.
  • the first threshold is 8200
  • the second threshold is 0.18
  • the third threshold is 0.80
  • the fourth threshold is 0.01
  • the fifth threshold is 0.9.
  • the above thresholds are only for reference, and each threshold can be set according to actual conditions.
  • control method for the photographing control system in FIG. 4 specifically includes:
  • Step 602 When receiving a shooting instruction of the user, start the color camera.
  • step 604 it is determined whether the backlight detection switch is turned on. If yes, step 606 is performed; otherwise, step 618 is performed.
  • Step 606 Start a black and white camera to obtain a black and white preview image of the current scene.
  • Step 608 Acquire brightness information of the current scene.
  • step 610 a backlight scene detection is performed.
  • step 612 it is determined whether the backlight is backlit. If yes, step 614 is performed; otherwise, step 616 is performed.
  • step 614 the HDR shooting function of the color camera is activated.
  • step 616 it is determined whether the user presses the shutter, and if so, step 620 is performed; otherwise, step 608 is returned.
  • step 618 the color camera performs shooting according to the preset mode.
  • a color image of the current scene is recorded.
  • the color camera is a main camera for collecting color information of the current scene;
  • the black and white camera is a sub camera for collecting object brightness information.
  • the brightness information collected by the black-and-white camera is the real brightness information of the scene, and is not affected by the single (bias) color light, which improves the accuracy and practicability of the backlight detection during the photographing process, optimizes the photographing effect, thereby improving the user experience. .
  • the technical solution of the present invention is described in detail above with reference to the accompanying drawings.
  • the technical solution of the present invention proposes a new camera control scheme, which performs back light detection based on the analysis of the acquired black and white preview picture, thereby effectively avoiding the color cast light.
  • the effect is to improve the accuracy of the backlight detection during the photographing process, and at the same time enhance the practicability of the backlight detection and optimize the photographing effect, thereby improving the user experience.

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Abstract

一种拍照控制方法、拍照控制装置及终端，其中，所述拍照控制方法，包括：当接收到用户的拍照指令时，通过所述终端的第一摄像头获取当前场景的黑白预览图片；对所述黑白预览图片进行分析，以检测所述当前场景是否逆光；根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照，其中，所述第二摄像头用于拍摄彩色图片。通过基于对获取的黑白预览图片的分析来进行逆光检测，有效地避免受偏色光的影响，提高拍照过程中逆光检测的准确性，同时增强逆光检测的实用性，优化拍照效果，从而提升了用户的使用体验。

Description

拍照控制方法、拍照控制装置及终端 技术领域
本发明涉及终端技术领域，具体而言，涉及一种拍照控制方法、一种拍照控制装置和一种终端。
背景技术
目前，数码的应用越来越广泛，除了专业的数码相机产品之外，在众多电子设备上已经集成了不同精度的数码相机。例如，在笔记本型计算机中大多集成了数码摄像头，在个人数字助理、智能手机中大多集成了数码相机或平板电脑中也集成了数码相机。
在利用数码相机进行图片拍摄时，不可避免地会遇到逆光场景拍摄和非逆光场景拍摄的问题。而在逆光拍照的情况下，往往出现背景部分过亮而真正所关注的被摄物体即对象部分过暗的结果，从而严重影响图片拍照质量。
为此，在拍照过程中往往会进行逆光场景的检测，而相关技术中逆光场景检测一般可以通过硬件方式和软件方式来实现，虽然能够进行逆光场景的检测，但还存在一些不足之处：
1、硬件方式中，一般采用传感器来检测，但传感器的成本比较高；
2、软件方式中，往往会因受数码相机镜头质量和偏色光的影响，而导致检测结果偏差比较大，准确率低；
3、实用性和用户体验都比较差。
因此，如何能够提高拍照过程中逆光检测的准确性，优化拍照效果，从而提升用户的使用体验成为亟待解决的技术问题。
发明内容
本发明正是基于上述技术问题至少之一，提出了一种新的拍照控制方 案，通过基于对获取到黑白预览图片的分析来进行逆光检测，有效地避免受偏色光的影响，提高拍照过程中逆光检测的准确性，同时增强逆光检测的实用性，优化拍照效果，从而提升了用户的使用体验。
有鉴于此，本发明提出了一种拍照控制方法，包括：当接收到用户的拍照指令时，通过所述终端的第一摄像头获取当前场景的黑白预览图片；对所述黑白预览图片进行分析，以检测所述当前场景是否逆光；根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照，其中，所述第二摄像头用于拍摄彩色图片。
在该技术方案中，通过终端的第一摄像头获取当前场景的黑白预览图片，并对黑白预览图片进行分析，以检测当前场景是否逆光，在这一过程中，由于获取的是黑白预览图片，所以在对黑白预览图片进行分析时不受偏色光的影响，也不易受到摄像头质量好坏的影响，有效地提高了拍照过程中逆光检测的准确性，也增强了逆光检测的实用性；同时通过根据检测结果开启终端的第二摄像头的目标拍照模式，以在目标拍照模式下对当前场景进行拍照，从而优化了拍照效果，提升了用户的使用体验。
在上述技术方案中，优选地，所述对所述黑白预览图片进行分析，以检测所述当前场景是否逆光的步骤包括：对所述黑白预览图片进行分析，以获取所述当前场景的亮度信息；根据所述亮度信息生成所述当前场景的亮度直方图；根据预设逆光检测算法和所述亮度直方图确定所述当前场景的逆光检测参数，以根据所述逆光检测参数所处的阈值范围确定所述当前场景是否逆光；以及所述逆光检测参数包括：所述亮度直方图的标准差、所述黑白预览图片的亮光占比、暗光占比和强光占比。
在该技术方案中，通过对黑白预览图片进行分析，以获取当前场景的亮度信息，而黑白预览的图片在获取过程中，透过镜头的是白色光，使得获取到的亮度信息不受偏色光的影响，有效地避免了因获取到亮度信息不准确而导致后续分析过程出现较大偏差的问题，提高了拍照过程中逆光检测的准确性。
在上述技术方案中，优选地，所述目标拍照模式包括：HDR模式或预置模式。
在该技术方案中，HDR(High Dynamic Range,高动态范围)模式是一种可以提供更多的动态范围和图像细节的拍照模式，预置模式为用户预先设定的除HDR模式外的任一拍照模式或终端默认的拍照模式，例如全自动模式，风景模式等。
在上述技术方案中，优选地，所述根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照的步骤包括：若检测到所述当前场景逆光，则开启所述第二摄像头的HDR模式，以在所述HDR模式下对所述当前场景进行拍照；若检测到当前场景不逆光，则开启所述第二摄像头的预置模式，以在所述预置模式下对所述当前场景进行拍照。
在该技术方案中，通过检测结果来自动开启HDR模式或预置模式对当前场景进行拍照，避免了用户自己手动操作，提升了用户的使用体验；同时通过在逆光场景下开启第二摄像头的HDR模式，使得通过HDR模式来弥补逆光拍照的缺陷，从而优化了拍照效果。
在上述技术方案中，优选地，在所述接收到用户的拍照指令之后，以及所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤之前，还包括：检测是否接收到来自所述用户的开启逆光检测指令；在确定未接收到所述开启逆光检测指令时，触发所述第二摄像头，以对所述当前场景进行拍照；在确定接收到所述开启逆光检测指令时，则执行所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤。
在该技术方案中，通过检测是否接收到来自用户的开启逆光检测指令，以确定是否对当前场景进行逆光检测，使得用户可以根据需要自动开启或关闭逆光检测功能，有效地避免了在用户自己可以判断出当前场景不逆光时而终端仍自行进行逆光检测的情况的发生，提升了用户的使用体验，同时降低了终端的运行负担。
根据本发明的第二方面，提出了一种拍照控制装置，包括：获取单元，用于当接收到用户的拍照指令时，通过所述终端的第一摄像头获取当前场景的黑白预览图片；第一检测单元，对所述黑白预览图片进行分析，以检测所述当前场景是否逆光；处理单元，用于根据检测结果开启所述终 端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照，其中，所述第二摄像头用于拍摄彩色图片
在该技术方案中，通过终端的第一摄像头获取当前场景的黑白预览图片，并对黑白预览图片进行分析，以检测当前场景是否逆光，在这一过程中，由于获取的是黑白预览图片，所以在对黑白预览图片进行分析时不受偏色光的影响，也不易受到摄像头质量好坏的影响，有效地提高了拍照过程中逆光检测的准确性，也增强了逆光检测的实用性；同时通过根据检测结果开启终端的第二摄像头的目标拍照模式，以在目标拍照模式下对当前场景进行拍照，从而优化了拍照效果，提升了用户的使用体验。
在上述技术方案中，优选地，所述第一检测单元具体用于：对所述黑白预览图片进行分析，以获取所述当前场景的亮度信息；根据所述亮度信息生成所述当前场景的亮度直方图；根据预设逆光检测算法和所述亮度直方图确定所述当前场景的逆光检测参数，以根据所述逆光检测参数所处的阈值范围确定所述当前场景是否逆光；以及所述逆光检测参数包括：所述亮度直方图的标准差、所述黑白预览图片的亮光占比、暗光占比和强光占比。
在该技术方案中，通过对黑白预览图片进行分析，以获取当前场景的亮度信息，而黑白预览的图片在获取过程中，透过镜头的是白色光，使得获取到的亮度信息不受偏色光的影响，有效地避免了因获取到亮度信息不准确而导致后续分析过程出现较大偏差的问题，提高了拍照过程中逆光检测的准确性。
在上述技术方案中，优选地，所述目标拍照模式包括：HDR模式或预置模式。
在该技术方案中，HDR(High Dynamic Range,高动态范围)模式是一种可以提供更多的动态范围和图像细节的拍照模式，预置模式为用户预先设定的除HDR模式外的任一拍照模式或终端默认的拍照模式，例如全自动模式，风景模式等。
在上述技术方案中，优选地，所述处理单元具体用于：若所述第一检测单元检测到所述当前场景逆光，则开启所述第二摄像头的HDR模式， 以在所述HDR模式下对所述当前场景进行拍照；若所述第一检测单元检测到当前场景不逆光，则开启所述第二摄像头的预置模式，以在所述预置模式下对所述当前场景进行拍照。
在该技术方案中，通过检测结果来自动开启HDR模式或预置模式对当前场景进行拍照，避免了用户自己手动操作，提升了用户的使用体验；同时通过在逆光场景下开启第二摄像头的HDR模式，使得通过HDR模式来弥补逆光拍照的缺陷，从而优化了拍照效果。
在上述技术方案中，优选地，还包括：第二检测单元，用于检测是否接收到来自所述用户的开启逆光检测指令；所述处理单元还用于：在确定未接收到所述开启逆光检测指令时，触发所述第二摄像头，以对所述当前场景进行拍照；在确定接收到所述开启逆光检测指令时，则执行所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤。
在该技术方案中，通过检测是否接收到来自用户的开启逆光检测指令，以确定是否对当前场景进行逆光检测，使得用户可以根据需要自动开启或关闭逆光检测功能，有效地避免了在用户自己可以判断出当前场景不逆光时而终端仍自行进行逆光检测的情况的发生，提升了用户的使用体验，同时降低了终端的运行负担。
根据本发明的第三方面，还提出了一种终端，包括：如上述技术方案中任一项所述的拍照控制装置。以此，该终端具有和上述技术方案中任一项所述的拍照控制装置相同的技术效果，在此不再赘述。
通过以上技术方案，通过基于对获取到黑白预览图片的分析来进行逆光检测，有效地避免受偏色光的影响，提高拍照过程中逆光检测的准确性，优化拍照效果，从而提升了用户的使用体验。
附图说明
图1示出了根据本发明的一个实施例的拍照控制方法的示意流程图；
图2示出了根据本发明的一个实施例的拍照控制装置的示意框图；
图3示出了根据本发明的一个实施例的终端的结构示意框图；
图4示出了根据本发明的一个实施例的拍照控制系统的结构示意框 图；
图5示出了根据本发明的一个实施例的逆光检测方法的示意流程图；
图6示出了用于图4中的拍照控制系统的控制方法的示意流程图。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。
图1示出了根据本发明的一个实施例的拍照控制方法的示意流程图。
如图1所示，根据本发明的一个实施例的拍照控制方法，包括：步骤102，当接收到用户的拍照指令时，通过所述终端的第一摄像头获取当前场景的黑白预览图片；步骤104，对所述黑白预览图片进行分析，以检测所述当前场景是否逆光；步骤106，根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照，其中，所述第二摄像头用于拍摄彩色图片
在该技术方案中，通过终端的第一摄像头获取当前场景的黑白预览图片，并对黑白预览图片进行分析，以检测当前场景是否逆光，在这一过程中，由于获取的是黑白预览图片，所以在对黑白预览图片进行分析时不受偏色光的影响，也不易受到摄像头质量好坏的影响，有效地提高了拍照过程中逆光检测的准确性，也增强了逆光检测的实用性；同时通过根据检测结果开启终端的第二摄像头的目标拍照模式，以在目标拍照模式下对当前场景进行拍照，从而优化了拍照效果，提升了用户的使用体验。
在上述技术方案中，优选地，所述对所述黑白预览图片进行分析，以检测所述当前场景是否逆光的步骤包括：对所述黑白预览图片进行分析，以获取所述当前场景的亮度信息；根据所述亮度信息生成所述当前场景的亮度直方图；根据预设逆光检测算法和所述亮度直方图确定所述当前场景 的逆光检测参数，以根据所述逆光检测参数所处的阈值范围确定所述当前场景是否逆光；以及所述逆光检测参数包括：所述亮度直方图的标准差、所述黑白预览图片的亮光占比、暗光占比和强光占比。
在该技术方案中，通过对黑白预览图片进行分析，以获取当前场景的亮度信息，而黑白预览的图片在获取过程中，透过镜头的是白色光，使得获取到的亮度信息不受偏色光的影响，有效地避免了因获取到亮度信息不准确而导致后续分析过程出现较大偏差的问题，提高了拍照过程中逆光检测的准确性。
在上述技术方案中，优选地，所述目标拍照模式包括：HDR模式或预置模式。
在该技术方案中，HDR(High Dynamic Range,高动态范围)模式是一种可以提供更多的动态范围和图像细节的拍照模式，预置模式为用户预先设定的除HDR模式外的任一拍照模式或终端默认的拍照模式，例如全自动模式，风景模式等。
在上述技术方案中，优选地，所述根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照的步骤包括：若检测到所述当前场景逆光，则开启所述第二摄像头的HDR模式，以在所述HDR模式下对所述当前场景进行拍照；若检测到当前场景不逆光，则开启所述第二摄像头的预置模式，以在所述预置模式下对所述当前场景进行拍照。
在该技术方案中，通过检测结果来自动开启HDR模式或预置模式对当前场景进行拍照，避免了用户自己手动操作，提升了用户的使用体验；同时通过在逆光场景下开启第二摄像头的HDR模式，使得通过HDR模式来弥补逆光拍照的缺陷，从而优化了拍照效果。
在上述技术方案中，优选地，在所述接收到用户的拍照指令之后，以及所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤之前，还包括：检测是否接收到来自所述用户的开启逆光检测指令；在确定未接收到所述开启逆光检测指令时，触发所述第二摄像头，以对所述当前场景进行拍照；在确定接收到所述开启逆光检测指令时，则执行所述通过 所述终端的第一摄像头获取当前场景的黑白预览图片的步骤。
在该技术方案中，通过检测是否接收到来自用户的开启逆光检测指令，以确定是否对当前场景进行逆光检测，使得用户可以根据需要自动开启或关闭逆光检测功能，有效地避免了在用户自己可以判断出当前场景不逆光时而终端仍自行进行逆光检测的情况的发生，提升了用户的使用体验，同时降低了终端的运行负担。
图2示出了根据本发明的一个实施例的拍照控制装置的示意框图。
如图2所示，根据本发明的一个实施例的拍照控制装置200，包括：获取单元202，用于当接收到用户的拍照指令时，通过所述终端的第一摄像头获取当前场景的黑白预览图片；第一检测单元204，对所述黑白预览图片进行分析，以检测所述当前场景是否逆光；处理单元206，用于根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照，其中，所述第二摄像头用于拍摄彩色图片
在该技术方案中，通过终端的第一摄像头获取当前场景的黑白预览图片，并对黑白预览图片进行分析，以检测当前场景是否逆光，在这一过程中，由于获取的是黑白预览图片，所以在对黑白预览图片进行分析时不受偏色光的影响，也不易受到摄像头质量好坏的影响，有效地提高了拍照过程中逆光检测的准确性，也增强了逆光检测的实用性；同时通过根据检测结果开启终端的第二摄像头的目标拍照模式，以在目标拍照模式下对当前场景进行拍照，从而优化了拍照效果，提升了用户的使用体验。
在上述技术方案中，优选地，所述第一检测单元204具体用于：对所述黑白预览图片进行分析，以获取所述当前场景的亮度信息；根据所述亮度信息生成所述当前场景的亮度直方图；根据预设逆光检测算法和所述亮度直方图确定所述当前场景的逆光检测参数，以根据所述逆光检测参数所处的阈值范围确定所述当前场景是否逆光；以及所述逆光检测参数包括：所述亮度直方图的标准差、所述黑白预览图片的亮光占比、暗光占比和强光占比。
在该技术方案中，通过对黑白预览图片进行分析，以获取当前场景的亮度信息，而黑白预览的图片在获取过程中，透过镜头的是白色光，使得 获取到的亮度信息不受偏色光的影响，有效地避免了因获取到亮度信息不准确而导致后续分析过程出现较大偏差的问题，提高了拍照过程中逆光检测的准确性。
在上述技术方案中，优选地，所述目标拍照模式包括：HDR模式或预置模式。
在该技术方案中，HDR(High Dynamic Range,高动态范围)模式是一种可以提供更多的动态范围和图像细节的拍照模式，预置模式为用户预先设定的除HDR模式外的任一拍照模式或终端默认的拍照模式，例如全自动模式，风景模式等。
在上述技术方案中，优选地，所述处理单元206具体用于：若所述第一检测单元204检测到所述当前场景逆光，则开启所述第二摄像头的HDR模式，以在所述HDR模式下对所述当前场景进行拍照；若所述第一检测单元204检测到当前场景不逆光，则开启所述第二摄像头的预置模式，以在所述预置模式下对所述当前场景进行拍照。
在该技术方案中，通过检测结果来自动开启HDR模式或预置模式对当前场景进行拍照，避免了用户自己手动操作，提升了用户的使用体验；同时通过在逆光场景下开启第二摄像头的HDR模式，使得通过HDR模式来弥补逆光拍照的缺陷，从而优化了拍照效果。
在上述技术方案中，优选地，还包括：第二检测单元208，用于检测是否接收到来自所述用户的开启逆光检测指令；所述处理单元206还用于：在确定未接收到所述开启逆光检测指令时，触发所述第二摄像头，以对所述当前场景进行拍照；在确定接收到所述开启逆光检测指令时，则执行所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤。
在该技术方案中，通过检测是否接收到来自用户的开启逆光检测指令，以确定是否对当前场景进行逆光检测，使得用户可以根据需要自动开启或关闭逆光检测功能，有效地避免了在用户自己可以判断出当前场景不逆光时而终端仍自行进行逆光检测的情况的发生，提升了用户的使用体验，同时降低了终端的运行负担。
图3示出了根据本发明的一个实施例的终端的结构示意框图。
如图3所示，根据本发明的一个实施例的终端300，包括：如图2所 示的拍照控制装置200。以此，该终端300具有和如图2所示的拍照控制装置200相同的技术效果，在此不再赘述。
以下结合图4至图6对本发明的技术方案进一步说明。
图像采集设备，包括相机，手机等，面对太阳等强光源进行图像采集时，拍摄出的照片往往对比度过强，丢失了很多的图像细节，而且照片颜色信息丢失很严重。而随着手持移动设备成像质量的提高，越来越多的用户使用手机拍照，而且希望能够在逆光条件下也能拍摄出满意的照片。
为此，在本实施例中，提出了一种拍照控制系统，具体地，如图4所示，拍照控制系统包括设置模块402、双摄像模块404，协同机制模块406，其中，设置模块402，用于设置逆光检测功能的开启和闭合；双摄像头模块404，用于通过黑白摄像头和彩色摄像头来进行图像采集；协同机制模块406，用于进行逆光场景检测，以根据检测结果来启动/关闭HDR模式。
具体地，如图5所示，根据本发明的一个实施例的逆光检测方法，包括以下步骤：
步骤502，通过黑白摄像头获取当前场景的黑白预览图像，并基于黑白预览图像获取当前场景的亮度信息。
步骤504，统计当前场景的亮度信息对应的亮度直方图。
步骤506，计算出亮度直方图的均值和标准差。
步骤508，根据预设逆光检测算法及亮度直方图，确定当前场景的逆光检测参数。其中，逆光检测参数包括亮度直方图的标准差、黑白预览图片的亮光占比、暗光占比和强光占比。
步骤510，根据所述逆光检测参数所处的阈值范围确定所述当前场景是否逆光。具体地，当亮度直方图的标准差大于第一阈值，暗光占比大于第二阈值且小于第三阈值，同时亮光占比大于第四阈值时，和/或当亮度直方图的标准差大于第一阈值，且强光占比大于第五阈值时，判定所述当前场景逆光；否则，判定所述当前场景非逆光。其中，第一阈值为8200，第二阈值为0.18，第三阈值为0.80，第四阈值为0.01，第五阈值为0.9，以上各阈值仅作参考，各个阈值可根据实际情况进行设置。
如图6所示，用于图4中拍照控制系统的控制方法，具体包括：
步骤602，在接收到用户的拍摄指令时，启动彩色摄像头。
步骤604，判断逆光检测开关是否开启，若是，执行步骤606；否则，执行步骤618。
步骤606，启动黑白摄像头获取当前场景的黑白预览图像。
步骤608，获取当前场景的亮度信息。
步骤610，进行逆光场景检测。
步骤612，判断是否逆光，若是，执行步骤614；否则，并执行步骤616。
步骤614，启动彩色摄像头的HDR拍摄功能。
步骤616，判断用户是否按下快门，若是，执行步骤620；否则，返回执行步骤608。
步骤618，彩色摄像头按照预置模式进行拍摄。
步骤620，记录当前场景的彩色图像。
在本实施例中，彩色摄像头是主摄像头，用来采集当前场景的色彩信息；黑白摄像头是副摄像头，用来采集物体亮度信息。利用黑白摄像头采集到的亮度信息是景物的真实亮度信息，不会受到单(偏)色光影响，提高了拍照过程中逆光检测的准确性及实用性，优化拍照效果，从而提升了用户的使用体验。
以上结合附图详细说明了本发明的技术方案，本发明的技术方案提出了一种新的拍照控制方案，通过基于对获取到黑白预览图片的分析来进行逆光检测，有效地避免受偏色光的影响，提高拍照过程中逆光检测的准确性，同时增强了逆光检测的实用性，优化拍照效果，从而提升了用户的使用体验。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (11)

  1. 一种拍照控制方法，用于终端，其特征在于，包括：
    当接收到用户的拍照指令时，通过所述终端的第一摄像头获取当前场景的黑白预览图片；
    对所述黑白预览图片进行分析，以检测所述当前场景是否逆光；
    根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照，其中，所述第二摄像头用于拍摄彩色图片。
  2. 根据权利要求1所述的拍照控制方法，其特征在于，所述对所述黑白预览图片进行分析，以检测所述当前场景是否逆光的步骤包括：
    对所述黑白预览图片进行分析，以获取所述当前场景的亮度信息；
    根据所述亮度信息生成所述当前场景的亮度直方图；
    根据预设逆光检测算法和所述亮度直方图确定所述当前场景的逆光检测参数，以根据所述逆光检测参数所处的阈值范围确定所述当前场景是否逆光；以及
    所述逆光检测参数包括：
    所述亮度直方图的标准差、所述黑白预览图片的亮光占比、暗光占比和强光占比。
  3. 根据权利要求1所述的拍照控制方法，其特征在于，所述目标拍照模式包括：HDR模式或预置模式。
  4. 根据权利要求3所述的拍照控制方法，其特征在于，所述根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照的步骤包括：
    若检测到所述当前场景逆光，则开启所述第二摄像头的HDR模式，以在所述HDR模式下对所述当前场景进行拍照；
    若检测到当前场景不逆光，则开启所述第二摄像头的预置模式，以在所述预置模式下对所述当前场景进行拍照。
  5. 根据权利要求1至4中任一项所述的拍照控制方法，其特征在 于，在所述接收到用户的拍照指令之后，以及所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤之前，还包括：
    检测是否接收到来自所述用户的开启逆光检测指令；
    在确定未接收到所述开启逆光检测指令时，触发所述第二摄像头，以对所述当前场景进行拍照；
    在确定接收到所述开启逆光检测指令时，则执行所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤。
  6. 一种拍照控制装置，用于终端，其特征在于，包括：
    获取单元，用于当接收到用户的拍照指令时，通过所述终端的第一摄像头获取当前场景的黑白预览图片；
    第一检测单元，对所述黑白预览图片进行分析，以检测所述当前场景是否逆光；
    处理单元，用于根据检测结果开启所述终端的第二摄像头的目标拍照模式，以在所述目标拍照模式下对所述当前场景进行拍照，其中，所述第二摄像头用于拍摄彩色图片。
  7. 根据权利要求6所述的拍照控制装置，其特征在于，所述第一检测单元具体用于：
    对所述黑白预览图片进行分析，以获取所述当前场景的亮度信息；
    根据所述亮度信息生成所述当前场景的亮度直方图；
    根据预设逆光检测算法和所述亮度直方图确定所述当前场景的逆光检测参数，以根据所述逆光检测参数所处的阈值范围确定所述当前场景是否逆光；以及
    所述逆光检测参数包括：
    所述亮度直方图的标准差、所述黑白预览图片的亮光占比、暗光占比和强光占比。
  8. 根据权利要求6所述的拍照控制装置，其特征在于，所述目标拍照模式包括：HDR模式或预置模式。
  9. 根据权利要求8所述的拍照控制装置，其特征在于，所述处理单元具体用于：
    若所述第一检测单元检测到所述当前场景逆光，则开启所述第二摄像头的HDR模式，以在所述HDR模式下对所述当前场景进行拍照；
    若所述第一检测单元检测到当前场景不逆光，则开启所述第二摄像头的预置模式，以在所述预置模式下对所述当前场景进行拍照。
  10. 根据权利要求6至9中任一项所述的拍照控制装置，其特征在于，还包括：
    第二检测单元，用于检测是否接收到来自所述用户的开启逆光检测指令；
    所述处理单元还用于：
    在确定未接收到所述开启逆光检测指令时，触发所述第二摄像头，以对所述当前场景进行拍照；
    在确定接收到所述开启逆光检测指令时，则执行所述通过所述终端的第一摄像头获取当前场景的黑白预览图片的步骤。
  11. 一种终端，其特征在于，包括：如权利要求6至10中任一项所述的拍照控制装置。
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