TW201534119A - Method for filling light and electronic apparatus thereof - Google Patents

Abstract

A method for filing light and an electronic apparatus thereof are provided. The method is adapted to the electronic apparatus having a screen. The method includes: detecting an ambient brightness; determining whether the ambient brightness is below a threshold value; if the ambient brightness is below the threshold value, activating a backlight filing mode which includes minimizing a preview image on the screen and generating a predetermined backlight out of a remaining image on the screen after the screen minimizing the preview image; and selecting an exposure combination according to the ambient brightness detected after activating the backlight filing mode.

Description

Filling method and electronic device thereof

The present invention relates to an image capture technique, and more particularly to a fill light method and an electronic device therefor.

With the rapid development of technology, the use of cameras on mobile communication devices has become a very popular application, and users have more and more requirements for camera applications for mobile communication devices. However, the quality of camera imaging depends on the size of the photosensitive element, the design of the lens and the aperture, but these components are limited by the size of the mobile device, so the quality of the camera imaging is therefore limited by the hardware design.

For the timing of the front lens of the mobile phone camera, the user is not only used for self-photographing, but also often used to adjust the appearance of his own appearance, but the quality of the photosensitive element of the front lens and the ability of the image post-processing, In the low-light use scene, there are often very serious noises, resulting in poor image quality. For example, with most exposure combinations currently on the market, when the brightness is lower than 30 lux (lux units), the frame rate is usually 15 fps (frame rate). (Gain) for the 16x exposure combination Line exposure compensation, and when the brightness is lower, it will use an exposure combination with a frame rate of 7.5fps and a gain of 16x. However, this combination of exposures has two problems under low light sources, one of which is too much noise, and the other is that the number of images is too low, causing the user to shake hands when taking pictures, and the two Problems can cause blurred images to be blurred.

In view of this, the present invention provides a fill light method and an electronic device thereof, which can provide a light-filling mechanism under low light source, and with appropriate exposure compensation, thereby capturing a clear image.

The invention provides a light filling method suitable for an electronic device having a screen, the method of filling light comprising the following steps. Sensing ambient brightness. Determine if the ambient brightness is less than the threshold. If the ambient brightness is less than the threshold value, the backlight fill mode is turned on, which includes reducing the preview screen in the screen and generating a preset backlight on the remaining screen after the screen is zoomed out. According to the ambient brightness sensed after the backlight fill mode is turned on, the corresponding exposure combination is selected.

The invention provides an electronic device comprising an image capturing unit, a screen, a backlight unit and a processing unit. The image capturing unit is used to sense the brightness of the environment and capture a preview image. The screen is coupled to the image capturing unit for displaying a preview image. The backlight unit is coupled to the screen to provide a light source required for the screen. The processing unit is coupled to the image capturing unit, the screen, and the backlight unit. The processing unit determines whether the ambient brightness sensed by the image capturing unit is less than a threshold value. If the ambient brightness is less than the door Depreciation, the backlight fill mode is turned on, which includes reducing the preview image in the screen, and reducing the preview screen after the screen is reduced, generating a preset backlight through the backlight unit, and causing the image capturing unit to turn on the backlight fill mode. The ambient brightness sensed by the rear image capturing unit selects the corresponding exposure combination.

Based on the above, in the light filling method and the electronic device of the embodiment, when the ambient brightness is less than the threshold value, the electronic device turns on the backlight fill mode, and the preview screen of the screen is reduced, and the preview image is reduced through the screen. The remaining screens below produce a preset backlight. Therefore, the image capturing unit at this time can maintain the appropriate frame rate and the size of the gain to avoid selecting a too low frame rate or an excessively high gain, thereby reducing the shooting noise, and accordingly, the light source in the external environment can be compared. A clear image is taken when low.

The above described features and advantages of the invention will be apparent from the following description.

100‧‧‧Electronic devices

102‧‧‧Image capture unit

104‧‧‧ screen

106‧‧‧Backlight unit

108‧‧‧Processing unit

210, 210’‧‧‧ preview screen

220‧‧‧ remaining screen

S202, S204, S206, S208, S210‧‧‧ steps of the fill method

FIG. 1 is a schematic diagram of an electronic device according to an exemplary embodiment of the invention.

2A is a flow chart of a method of filling light according to an embodiment of the invention.

2B and 2C are schematic diagrams of a method of filling light according to an embodiment of the invention.

FIG. 3A is an exposure compensation indicator table according to an embodiment of the invention.

FIG. 3B is a table showing the correspondence between ambient brightness and exposure according to an embodiment of the invention.

FIG. 1 is a block diagram of an electronic device according to an embodiment of the invention. Please refer to FIG. 1 , the electronic device 100 of the embodiment is, for example, a notebook computer, a tablet PC, a personal digital assistant (PDA), a smart phone, an e-book, a game machine, etc., with a touch screen. The electronic device is not limited by the present invention. The electronic device 100 of this embodiment includes an image capturing unit 102, a screen 104, a backlight unit 106, and a processing unit 108, the functions of which are described below.

The image capturing unit 102 can be a device including a lens, a diaphragm, a shutter, and a photosensitive element, and wherein the lens refers to a front lens, that is, disposed on the same side of the electronic device 100 as the screen 104. In this embodiment, the image capturing unit 102 senses the ambient brightness of the environment in which the electronic device 100 is located, and captures the image as a preview image and displays it through the screen 104.

The screen 104 is coupled to the image capturing unit 102 for displaying the preview image. Here, the screen 104 can be various types of touch screens, such as a resistive touch screen, a capacitive touch screen, an optical touch screen, and an acoustic wave touch. Screens, electromagnetic touch screens, etc., but are not limited to this. The touch screen 104 can be used as an input/output interface of the electronic device 100. In other words, Firefly The screen 104 can receive a touch input from a user and can display information in the electronic device 100. In another embodiment, the screen 104 may also be a liquid crystal screen having only a display function. The user must input through an input interface such as a mouse, a keyboard, a tablet, etc., which is not limited in the present invention.

The backlight unit 106 is coupled to the screen 104 for providing a light source required by the screen 104. In this embodiment, after the processing unit 108 turns on the backlight fill mode (described in detail later), the backlight unit 106 provides a preset backlight to increase the display brightness of the screen 104.

The processing unit 108 is coupled to the image capturing unit 102, the screen 104, and the backlight unit 106 to control the overall operation of the electronic device 100, and can implement the electronic device 100 by using the image capturing unit 102, the screen 104, and the backlight unit 106. Fill light method. Furthermore, the processing unit 108 may include at least one of a central processing unit (CPU), an embedded controller, and a micro-controller, but is not limited thereto.

2A is a flow chart of a method of filling light according to an embodiment of the invention. 2B and 2C are schematic diagrams of a method of filling light according to an embodiment of the invention. The method proposed in this embodiment can be performed by the electronic device 100 in FIG. 1, and the details of the steps of the embodiment are described below in conjunction with the various elements of FIG. 1.

Referring to FIG. 2A, in step S202, the image capturing unit 102 senses the ambient brightness. In step S204, the processing unit 108 determines whether the ambient brightness is less than a threshold value. The threshold value is, for example, 50 lux (lux unit), but is not limited thereto.

If the ambient brightness is less than the threshold value, the processing list is as shown in step S206. Element 108 will turn on the backlight fill mode. In detail, in the backlight fill mode, the processing unit 108 reduces the preview screen in the screen 104, and generates a preset backlight through the backlight unit 106 in the remaining screen after the screen 104 is reduced in the preview screen. As shown in FIG. 2B, the screen displayed on the screen 104 is an unreduced preview screen 210 (ie, an area drawn in dots), and as shown in FIG. 2C, the screen displayed on the screen 104 is a reduced preview screen. 210' and the remaining screen 220 after the screen 104 is reduced by the preview screen (that is, the area left by the screen 104 to reduce the preview screen 210 is the remaining screen 220, such as an area not shown in dots). Moreover, the processing unit 108 generates a preset backlight in the area of the remaining screens 220 through the backlight unit 106. In the present embodiment, when the processing unit 108 reduces the preview screen 210, for example, the resolution of the preview screen 210 is reduced by about a quarter, but the embodiment is not limited thereto. For example, assume that the resolution of the preview screen 210 is 1920x1080, and the resolution of the preview screen 210' after zooming out may be 480x270 or 480x380. In addition, the preset backlight described above is, for example, a white backlight. In this way, by generating a preset backlight through the backlight unit 106, the image capturing unit 102 can sense a higher ambient brightness.

It should be noted that, in this embodiment, the resolution ratio of the preview screen 210 is reduced by the processing unit 108, and the preview screen 210 is reduced. That is, the processing unit 108 can reduce the resolution of the preview screen 210 according to the user's setting. The ratio, and processing unit 108 can also zoom out preview screen 210 in other directions. In addition, the embodiment does not limit the preset backlight to be, for example, a white backlight; in other embodiments, the processing unit 108 may also use other pastel colors as the color of the preset backlight.

In step S208, the processing unit 108 causes the image capturing unit 102 to select a corresponding exposure combination according to the ambient brightness sensed by the image capturing unit 102 after the backlight fill mode is turned on. Specifically, the image capturing unit 102 can query the exposure combination corresponding to each brightness according to an exposure compensation indicator table. FIG. 3A is an exposure compensation indicator table according to an embodiment of the invention. Referring to FIG. 3A, the exposure compensation indicator table can be obtained through training, including each exposure index corresponding to each brightness, and a frame rate corresponding to each exposure index (Frame rate, in units of frames per second (Frame Per Second, FPS)) and gain (Gain). Of course, in other embodiments, the exposure combination can also include other parameters, such as the size of the aperture. Furthermore, the lower the brightness, the larger the exposure index, which means the more brightness that needs to be compensated; the higher the exposure index corresponding to the higher brightness, the less the brightness that needs to be compensated. In this way, the image capturing unit 102 can query the corresponding frame rate and gain according to the exposure index corresponding to each brightness in the exposure compensation indicator table to perform exposure compensation.

FIG. 3B is an ambient brightness and exposure according to an embodiment of the invention. Combine the correspondence table. Referring to FIG. 3B, in the embodiment, after the processing unit 108 turns on the backlight fill mode, if the ambient brightness sensed by the image capturing unit 102 is between 30 lux and 50 lux, the image capturing unit 102 selects The exposure combination has a frame rate of 20 fps and a gain of 8x. In addition, if the ambient brightness sensed by the image capturing unit 102 is less than or equal to 30 lux, the frame rate of the exposure combination selected by the image capturing unit 102 is 15 fps and the gain is 8×. In another embodiment, if the ambient brightness sensed by the image capturing unit 102 is less than 20 lux, the image is 撷 The exposure combination selected by the unit 102 may also be a frame rate of 15 fps and a gain of 16 (not shown in FIG. 3B). Of course, in other embodiments, the user can also set the parameters of the exposure combination corresponding to each brightness. In other words, even if the ambient brightness before the backlighting mode is turned on by the processing unit 108 is low, after the processing unit 108 turns on the backlight fill mode, since the image capturing unit 102 can detect the light source from the preset backlight, the image is defective. When the taking unit 102 selects the corresponding exposure combination, the exposure combination corresponding to the smaller exposure index (for example, including a higher frame rate and a lower gain) can be selected for exposure compensation. In this way, by selecting an appropriate exposure combination, the image capturing unit 102 can avoid the problem of jitter and excessive noise caused by the user due to low frame rate and high gain.

Referring to FIG. 2A again, if the ambient brightness is not less than the threshold value, the processing unit 108 does not turn on the backlight fill mode as shown in step S210. In other words, since the ambient brightness at this time is sufficient, the processing unit 108 does not generate a preset backlight through the backlight unit 106, but maintains the size of the preview screen in the screen 104. In addition, the image capturing unit 102 may also perform exposure compensation from the exposure compensation indicator table for the exposure combination whose corresponding brightness is greater than or equal to the threshold value (for example, the brightness is greater than or equal to 50 lux) according to the currently sensed brightness.

In summary, in the light filling method and the electronic device of the embodiment, when the ambient brightness is less than the threshold value, the electronic device turns on the backlight fill mode, reduces the preview screen of the screen, and reduces the preview image through the screen. The remaining screens are left to produce a preset backlight. Therefore, the image capturing unit can sense a higher ambient brightness, and accordingly select a suitable exposure combination. In other words, the image capture at this time The unit can still maintain the appropriate frame rate and gain to avoid too low frame rate or excessive gain, which can reduce the noise during shooting. In this way, when the light source of the external environment is insufficient, the light filling method and the electronic device of the embodiment can enable the image capturing unit to accelerate the number of images captured per second without increasing any cost. A clear image is taken to improve image quality.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

S202, S204, S206, S208, S210‧‧‧ steps of the fill method

Claims (10)

A method of filling light, which is suitable for an electronic device having a screen, the method of filling light includes: sensing an ambient brightness; determining whether the ambient brightness is less than a threshold; if the ambient brightness is less than the threshold, turning on a backlight a fill mode, comprising: reducing a preview image in the screen, and generating a preset backlight after the screen is reduced by the screen; and sensing the brightness of the environment according to the backlight fill mode. Select the corresponding exposure combination. The method of filling light according to claim 1, wherein the step of reducing the preview screen in the screen comprises: reducing the resolution of the preview screen to a quarter of the original. The method of supplementing light according to claim 1, wherein the step of selecting the corresponding exposure combination according to the ambient brightness sensed after the backlight fill mode is turned on comprises: if the brightness of the ambient brightness is less than 30 , the selected exposure combination has a frame rate of 15 fps and a gain of 8×; and if the brightness of the ambient brightness is between the threshold and 30, the selected frame ratio of the exposure combination is 20 fps and the gain is 8x. The method of filling light according to claim 1, wherein the corresponding exposure combination is selected according to the ambient brightness sensed after the backlight fill mode is turned on. The steps further include: if the brightness of the ambient brightness is less than 20, the selected exposure combination has a frame rate of 15 fps and a gain of 16 x. The method of supplementing light according to claim 1, wherein the step of selecting the corresponding exposure combination according to the ambient brightness sensed after the backlight fill mode is turned on comprises: querying the exposure compensation indicator according to an exposure compensation indicator table. The exposure combination corresponding to the ambient brightness, wherein the exposure compensation indicator table is obtained through training, and the exposure compensation indicator table includes an exposure index corresponding to the ambient brightness, and a frame rate and a gain corresponding to each of the exposure indices. An electronic device includes: an image capturing unit for sensing an ambient brightness and capturing a preview image; a screen coupled to the image capturing unit to display the preview image; a backlight unit coupled Connected to the screen to provide a light source required for the screen; a processing unit coupled to the image capturing unit, the screen, and the backlight unit, wherein the processing unit determines the ambient brightness sensed by the image capturing unit Whether it is less than a threshold value, if the ambient brightness is less than the threshold value, turning on a backlight fill mode, including reducing the preview image in the screen, and reducing the remaining screen after the preview screen, through the backlight The unit generates a preset backlight, and causes the image capturing unit to select a corresponding exposure combination according to the ambient brightness sensed by the image capturing unit after the backlight fill mode is turned on. The electronic device of claim 6, wherein the processing unit Reduce the resolution of the preview image to the original quarter. The electronic device of claim 6, wherein if the brightness of the ambient brightness is less than 30, the frame rate of the exposure combination selected by the image capturing unit is 15 fps and the gain is 8x, and if the ambient brightness The brightness of the exposure combination is between 20fps and the gain is 8x. The electronic device of claim 6, wherein if the brightness of the ambient brightness is less than 20, the frame rate of the exposure combination selected by the image capturing unit is 15 fps and the gain is 16x. The electronic device of claim 6, wherein the image capturing unit queries the exposure combination corresponding to the ambient brightness according to an exposure compensation indicator table, wherein the exposure compensation indicator table is obtained through training, and the exposure is The compensation indicator table includes an exposure index corresponding to the brightness of the environment, and a frame rate and a gain corresponding to each of the exposure indices.