KR20100125669A - Apparatus and method for preventing exposure lack capture in digital image processing device - Google Patents

Abstract

PURPOSE: A method and a device for preventing the lack of exposure of photographing in a digital image processor are provided to determines whether the strobe pop up is exists or not and to apply the exposure value, thereby preventing an image lack of exposure to be photographed by abnormally not popping up the strobe and obtaining the desired image. CONSTITUTION: An exposure setting unit sets a first exposure value when light emitting a strobe and a second exposure value when not light emitting the strobe. The determination unit determines whether the strobe is normally popped up or abnormally popped up. A display control unit(81) displays an image on a display unit by controlling a display unit(80). The whole operation of the digital image processor generalize a CPU(100).

Description

Apparatus and method for preventing exposure lack capture in digital image processing device}

The present invention relates to an apparatus and method for preventing underexposure shots in a digital image processor that prevents an underexposure image from being photographed due to abnormal strobe popup.

When taking an image in a digital image processor, in order to obtain an appropriate exposure value, an appropriate exposure value is generally obtained by adjusting the shutter, iris, and gain. At this time, the strobe is additionally used to adjust the exposure value in a dark environment or a backlight, and most digital image processors currently on the market have a built-in strobe. Some digital video processing products have strobes that are normally hidden and pop up as needed.

In the conventional digital image processor, a matrix called an exposure diagram is used to determine an appropriate exposure value when capturing an image. When the strobe is determined to emit light on the exposure diagram, the exposure value is set as it is and the image is taken as it is. If the strobe is not popped up, the strobe is popped up before shooting.

Finally, the part that emits strobes emits light after checking whether the strobe popup is normally performed. At this time, if the strobe popup does not work normally, the popup is attempted again.

In this exposure diagram, when the strobe emits light, the values of the remaining exposure parts are set to shoot in the brightness condition. Therefore, if the strobe emits light but fails to emit light, a dark image is taken due to underexposure. .

The technical problem to be solved by the present invention is to set the exposure value during the strobe light emission and non-light emission in advance, and to determine whether or not the strobe pop-up and apply the exposure value to prevent the abnormal strobe pop-up image to prevent the underexposure image is taken An image processor provides an apparatus and method for preventing underexposure shooting.

In the digital image processor according to the first embodiment to solve the technical problem to be solved by the present invention, the underexposure photographing prevention device is a digital image processor, and sets the exposure value for strobe light emission and non-emission photography, respectively, It is preferable to include a digital signal processing means for photographing the image by applying the set strobe light emission exposure value when the pop-up, and by applying the set strobe non-emission exposure value when the strobe is not pop-up.

In the present invention, the digital signal processing means comprises: an exposure value setting unit for setting a first exposure value at the time of strobe light emission and a second exposure value at the time of strobe non-light emission; A determination unit which determines whether the strobe is normally popped up or not abnormally popped up; And a controller configured to capture an image by applying the first exposure value when the strobe is popped up, and capture a image by applying the second exposure value when the strobe is not popped up.

In the digital image processor according to the second embodiment to solve the technical problem to be achieved by the present invention, the underexposure photographing prevention device is a digital image processor, when the strobe is not abnormally popped up during the image capture the strobe at that time It is preferable to include a digital signal processing means for capturing an image by setting the non-luminous exposure value and applying it.

The digital signal processing means includes: an exposure value setting unit for setting a first exposure value at the time of strobe light emission and setting a second exposure value at the time of strobe non-light emission by a control signal; A determination unit which determines whether the strobe is normally popped up or not abnormally popped up; When the strobe is popped up, the image is applied by applying the first exposure value. When the strobe is not popped up, the control signal is output to the exposure value setting unit so that the second exposure value is set at the corresponding time point. It may include a control unit for taking an image by applying the exposure value.

The method for preventing underexposure photographing in the digital image processor according to the first embodiment for solving the technical problem to be achieved by the present invention is an operation method of the digital image processor, which includes: (a) a first exposure value and the strobe when the strobe is emitted; Setting a second exposure value at non-light emission; (b) determining whether the strobe pops up normally or not abnormally; And (c) photographing the image by applying the first exposure value when the strobe is popped up, and photographing the image by applying the second exposure value when the strobe is not popped up.

The method for preventing underexposure photographing in the digital image processor according to the second embodiment to solve the technical problem to be achieved by the present invention is an operation method of the digital image processor, which includes (a) setting a first exposure value at the time of strobe light emission. step; (b) determining whether the strobe pops up normally or not abnormally; (c) photographing an image by applying the first exposure value when the strobe is popped up, and setting a second exposure value when the strobe is not emitted when the strobe is not popped up; And (d) taking the image by applying the second exposure value.

As described above, according to the present invention, the technical problem to be solved by the present invention is to set the exposure value at the time of strobe light emission and non-emission in advance, and determine whether or not the strobe pop-up by applying the exposure value abnormally strobe pop-up exposure It creates the effect of acquiring the desired image by preventing the lack of video to be taken.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a block diagram showing the configuration of an underexposure photographing prevention device in a digital image processor according to the present invention. In particular, FIG. 1 schematically illustrates a digital photographing apparatus as a kind of digital image processor. Of course, the present invention is not limited to the digital image photographing apparatus as shown in FIG. 1, and the present invention can be applied to an image processing apparatus such as a personal digital assistant (PDA), a personal multimedia player (PMP), or the like. This also applies to the embodiments described below and variations thereof.

The overall operation of the digital image processor is integrated by the CPU 100. The digital image processor is provided with an operation unit 200 including a key for generating an electrical signal from a user. The electrical signal from the operation unit 200 is transmitted to the CPU 100, so that the CPU 100 can control the digital image processor in accordance with the electrical signal.

In the photographing mode, as the electrical signal from the user is applied to the CPU 100, the CPU 100 detects the signal and controls the lens driver 11, the aperture driver 21, and the imaging device controller 31. Accordingly, the position of the lens 10, the opening degree of the diaphragm 20, the sensitivity of the imaging device 30, and the like are respectively controlled. The imaging device 30 generates data from the input light, and the analog / digital converter 40 converts the analog data output from the imaging device 30 into digital data. Of course, the analog / digital converter 40 may not be necessary depending on the characteristics of the imaging device 30.

Data from the image pickup device 30 may be input to the digital signal processing unit 50 via the memory 60, or may be input to the digital signal processing unit 50 without passing through the memory 60. It may also be input to 100. The memory 60 is a concept including a ROM or a RAM. The digital signal processor 50 may perform digital signal processing such as gamma correction and white balance change, as necessary. In addition, as shown in FIG. 3, the digital signal processor 50 may include components such as an exposure value setting unit 51, a strobe popup determination unit 53, a controller 55, and the like. Of course, the exposure value setting unit 51, the strobe pop-up determination unit 53, the control unit 55, and the like may be various components, such as components other than the components in the digital signal processing unit 50. That is, the digital image photographing apparatus according to the present embodiment may include the exposure value setting unit 51, the strobe popup determination unit 53, and the control unit 55. Operations of the exposure value setting unit 51, the strobe popup determination unit 53, and the control unit 55 will be described later.

The image from the data output from the digital signal processing unit 50 is transmitted to the display control unit 81 or directly through the memory 60. The display controller 81 controls the display 80 to display an image on the display 80. In the present invention, the display unit 80 may be a touch screen. The data output from the digital signal processing unit 50 is inputted through the memory 60 or directly to the storage / reading control unit 71. The storage / reading control unit 71 automatically generates an image according to a signal from a user or automatically. The data is stored in the storage medium 70. Of course, the storage / reading control unit 71 reads data from the image file stored in the storage medium 70 and inputs the data to the display control unit 81 through the memory 60 or through another path to the display unit 80. You can also have an image displayed. The storage medium 70 may be removable or permanently mounted to the digital image processor.

FIG. 2 is a diagram illustrating the presence or absence of a strobe popup in the apparatus of FIG. 1, and when the strobe 3 is popped up as shown in FIG. 2A, light emission is attempted. When the strobe 3 does not emit light and the strobe 3 emits light to prevent damage to the product, the light is not transmitted to the subject.

In this case, in the prior art, a dark image is obtained because the image is captured. However, in the present invention, when setting an appropriate exposure value at the time of image capturing, there are two cases of setting values of respective exposure factors (shutter, aperture, gain, strobe) to obtain brightness corresponding to the exposure value, that is, strobe (3). ) Is taken in advance, and shooting is performed in advance for both the strobe 3 and the non-emission photography.

Hereinafter, the function of the digital signal processor 50 will be described with reference to FIG. 3.

The digital signal processor 50 sets the exposure values for the strobe 3 emission and the non-emission photographing, respectively, and captures an image by applying the set strobe 3 emission exposure values when the strobe 3 pops up normally. If 3) does not pop up abnormally, the set image is controlled by applying the set strobe light emission value. To this end, the digital signal processing unit 50 includes an exposure value setting unit 51, a strobe popup determination unit 53, and a controller 55.

The exposure value setting unit 51 sets the first exposure value when the strobe 3 emits light and the second exposure value when the strobe 3 does not emit light together with the exposure factors shutter, aperture, and gain.

The strobe popup determination unit 53 determines whether the strobe 3 has popped up normally or not. A switch (not shown) is provided at the pop-up stage of the strobe 3, and the strobe pop-up determination unit 53 may determine whether the strobe 3 is popped up according to whether the switch is opened or closed.

The controller 55 captures an image by applying the first or second exposure value as a result of the determination of the strobe popup determination unit 53. When the strobe 3 emits light to capture an image, the controller 55 captures the image by applying the first exposure value when the strobe 3 emits light when the pop-up of the strobe 3 is normally performed. However, if the strobe 3 does not pop up abnormally, retry the strobe 3 popup, and if the popup does not pop up even after retrying, the image is taken by applying the second exposure value when the strobe 3 is not emitting light. .

According to the present invention, the exposure value (shutter, aperture, gain, strobe (3)) is set before the strobe (3) light emission is photographed. The image may be taken by applying the image processor, that is, by changing the time of resetting the exposure value.

Hereinafter, a method for preventing underexposure photographing in a digital image processor according to the present invention will be described in detail with reference to FIG. 4. The method for preventing underexposure photographing according to the present invention may be performed in the digital image processor as shown in FIG. 1. According to an embodiment, the main algorithm of the operation method may be performed by the help of peripheral components in the device. 50 may be performed inside.

When the power of the digital image processor is input for image capturing, the digital signal processor 50 displays the live view image on the display 80 (step 401).

When the first shutter release button 1 is input with the proper composition while the Live View image is displayed (step 403), the digital signal processor 50 performs AF driving (step 405). While moving the focus motor (not shown) during AF driving, the focus motor is continuously moved in the direction of increasing the focus value by comparing the magnitude of the current focus value with the magnitude of the previous focus value, and the focus value increases by the Hill-climb method. If there is a decrease, see it as the point of focus and focus.

When the AF driving is completed, the digital signal processor 50 sets a first exposure value for strobe light emission and a second exposure value for strobe non-light emission (step 407). In order to obtain an appropriate exposure value, the digital signal processor 50 generally obtains an appropriate exposure value by adjusting shutter, iris, and gain. In this case, the digital signal processor 50 additionally adjusts the exposure value under conditions such as a dark environment or a backlight, and additional strobe light is emitted. The first and second exposure values including the strobe non-light emission time are set.

When the exposure value setting is completed, the digital signal processing unit 50 determines whether to emit the strobe by determining a condition such as a dark environment or a backlight (step 409), and charges the strobe when the strobe emits light (411). In step 413, the strobe is popped up (step 413).

Thereafter, the digital signal processor 50 determines whether the strobe popup is completed (step 415), and if the strobe is not popped up again, charges the strobe again (step 417) and pops up the strobe (step 419).

After the retry, the digital signal processing unit 50 determines whether the strobe has popped up (step 421). Reset the processor (step 423).

After the digital image processor is reset to the second exposure value, when the second shutter release button 2 is input, the digital signal processor 50 starts capturing an image (step 425).

When the strobe pop-up is normally completed for the strobe light emission, the digital signal processor 50 emits the strobe (step 427), and performs the photography.

In another embodiment, the image may be photographed by resetting the exposure value at the time when strobe light is no longer applied, and then applying the same to the digital image processor, that is, by changing the time of resetting the exposure value.

1 is a block diagram showing the configuration of an underexposure photographing prevention device in a digital image processor according to the present invention.

FIG. 2 is a diagram illustrating the presence or absence of a strobe popup in the apparatus of FIG. 1.

3 is a detailed block diagram of a digital signal processor of the apparatus of FIG. 1.

4 is a flowchart illustrating an operation of a method for preventing underexposure photographing in a digital image processor according to the present invention.

Claims (6)

As a digital image processor, Set the exposure values for strobe emission and non-emission photography, and if the strobe is popped up, capture the image by applying the set strobe emission exposure value, and apply the set strobe non-emission exposure value if the strobe is not popped up. And a digital signal processing means for photographing. The method of claim 1, wherein the digital signal processing means An exposure value setting unit for setting a first exposure value at the time of strobe light emission and a second exposure value at the time of strobe non-light emission; A determination unit which determines whether the strobe is normally popped up or not abnormally popped up; And And a controller for capturing an image by applying the first exposure value when the strobe is popped up, and capturing an image by applying the second exposure value when the strobe is not popped up. As a digital image processor, And a digital signal processing means for capturing the image by setting the strobe non-light emission value at a corresponding point in time when the strobe is not abnormally popped up during image capturing. The method of claim 3, wherein the digital signal processing means An exposure value setting unit for setting a first exposure value at the time of strobe light emission and setting a second exposure value at the time of strobe non-light emission by a control signal; A determination unit which determines whether the strobe is normally popped up or not abnormally popped up; When the strobe is popped up, the image is applied by applying the first exposure value. When the strobe is not popped up, the control signal is output to the exposure value setting unit so that the second exposure value is set at the corresponding time point. And a control unit for capturing an image by applying an exposure value. 2. As an operation method of a digital image processor, (a) setting a first exposure value at the time of strobe light emission and a second exposure value at the time of strobe non-light emission; (b) determining whether the strobe pops up normally or not abnormally; And and (c) photographing the image by applying the first exposure value when the strobe is popped up, and photographing the image by applying the second exposure value when the strobe is not popped up. As an operation method of a digital image processor, (a) setting a first exposure value at the time of strobe light emission; (b) determining whether the strobe pops up normally or not abnormally; (c) photographing an image by applying the first exposure value when the strobe is popped up, and setting a second exposure value when the strobe is not emitted when the strobe is not popped up; And and (d) taking the image by applying the second exposure value.

Images