CN104811603B - Auxiliary focusing device and method - Google Patents

Abstract

The present invention provides an auxiliary focusing device and method, the method comprising the following steps: first, capturing a first real-time image at a first distance relative to the object to be photographed. Then, calculating the sharpness value of the first real-time image. Then, capturing a second real-time image at a second distance relative to the object to be photographed. Then, calculating the sharpness value of the second real-time image. Then, comparing the sharpness value of the first real-time image with the sharpness value of the second real-time image and transmitting a notification signal, the notification signal indicating the relative relationship between the first distance, the second distance and the focal distance. This method can indicate to the user the relationship between the position of the object to be photographed and the focal distance of the photographic device, so as to assist the user in determining the appropriate direction of movement.

Description

Auxiliary focusing device and method

technical field

The invention relates to an auxiliary focusing device and method, in particular to an auxiliary focusing device and method with a single focal length.

Background technique

There are many types of cameras currently on the market. Regarding the focus function, it can be divided into cameras with auto focus function and cameras without auto focus function. When using a camera with auto focus function, the user only needs to tap the shutter button to start auto focus. After the camera automatically adjusts the focus and then press the shutter, you can take a clear photo. However, when using a camera without focusing function, the user must rotate the focus ring on the lens to select an appropriate focal length for the subject to be photographed, and press the shutter button to take a photo after confirming that the subject’s image in the viewing window is clear with the eyes .

However, if the lens cannot select different focal lengths, that is, the lens only has a single focal length, the user needs to find the focal length of the lens by moving the position. When it becomes clear, stop moving and press the shutter to take a picture. However, without a focus-assisting device, it is inconvenient for the user to judge the appropriate moving direction or distance.

Contents of the invention

The purpose of the present invention is to provide an auxiliary focusing device and method, which can assist a user in focusing.

In order to achieve the above object, the present invention proposes a multimedia management device, a multimedia management method, and a computer-readable medium for executing the multimedia management method. By displaying playback records on the playback media interface, the user can know which multimedia files are The video screen has been viewed by another user.

To achieve the above object, the present invention provides an auxiliary focusing device, the auxiliary focusing device has an image capturing module and an image processing module. The image capturing module is used for capturing a first real-time image at a first distance relative to the object to be photographed and a second real-time image at a second distance relative to the object to be photographed. The image processing module is coupled to the image capture module, and the image processing module is used to calculate the sharpness value of the first real-time image and the sharpness value of the second real-time image, and compare the sharpness value of the first real-time image with the second real-time image and transmit a notification signal, the notification signal represents the relative relationship between the first distance, the second distance and the focus distance.

Wherein, when the image processing module determines that the sharpness value of the first real-time image is greater than the sharpness value of the second real-time image, the sharpness value of the first real-time image is compared with a sharpness value of a third real-time image. Threshold value, the third real-time image is captured at a third distance relative to the object to be photographed.

Wherein, when the image processing module determines that the sharpness value of the first real-time image is smaller than the sharpness value of the second real-time image, the sharpness value of the second real-time image is compared with a sharpness value of a third real-time image. Threshold value, the third real-time image is captured at a third distance relative to the object to be photographed.

Wherein, when the image processing module determines that the sharpness value of the third real-time image is smaller than the threshold value, the threshold value is the maximum sharpness value in a moving area.

Wherein, when the image processing module determines that the sharpness value of the third real-time image is equal to the maximum sharpness value of the moving area, the notification signal indicates that the third distance is the focus distance.

Wherein, the notification signal is displayed on a display interface.

To achieve the above object, the present invention provides an auxiliary focus method for capturing a first real-time image at a first distance from an object to be photographed. A sharpness value of the first real-time image is calculated. A second real-time image is captured at a second distance relative to the object to be photographed. Calculate the sharpness value of the second real-time image and compare the sharpness value of the first real-time image with the sharpness value of the second real-time image and send a notification signal, the notification signal indicates the relative relationship between the first distance, the second distance and the focus distance.

Wherein, when the sharpness value of the first real-time image is greater than the sharpness value of the second real-time image, the sharpness value of the first real-time image is compared with a threshold value of the sharpness value of a third real-time image, the The third real-time image is captured at a third distance relative to the subject.

Wherein, when the sharpness value of the first real-time image is smaller than the sharpness value of the second real-time image, the sharpness value of the second real-time image is compared with a threshold value of the sharpness value of a third real-time image, the The third real-time image is captured at a third distance relative to the subject.

Wherein, when the sharpness value of the third real-time image is smaller than the threshold value, the threshold value is the maximum sharpness value in a moving area.

Wherein, when the sharpness value of the third real-time image is equal to the maximum sharpness value of the moving area, the notification signal indicates that the third distance is the focus distance.

Wherein, the notification signal is displayed on a display interface.

To sum up, the present invention can compare the sharpness values of real-time images captured at different distances from the object to be photographed, based on which it can be judged that the distance to the object to be photographed this time is compared with the distance to the object to be photographed last time. Whether the distance of the object is close to or far from the focal distance of the object to be photographed, and according to the relative relationship between the distance to the object to be photographed and the focal distance to the object to be photographed, different types of notification signals are sent to assist User focuses.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

FIG. 1 is a functional block diagram of an auxiliary focusing device according to an embodiment of the present invention.

FIG. 2 is a flow chart of a method for assisting focusing according to an embodiment of the invention.

FIG. 3A is a schematic diagram of the relative relationship between the first distance, the second distance and the focus distance according to an embodiment of the present invention.

3B is a schematic diagram of the relative relationship between the first distance, the second distance and the focus distance according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of a method for assisting focusing according to an embodiment of the invention.

Among them, reference signs:

1 Auxiliary focusing device

10 Image capture module

12 image processing module

14 storage modules

16 power supply module

D1 first distance

D2 second distance

D3 third distance

D4 focal length

detailed description

The detailed features and advantages of the present invention are described in detail below in the embodiments, the content of which is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the patent scope of the application and the drawings , any person skilled in the art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the concept of the present invention in detail, but do not limit the scope of the present invention in any way.

Please refer to FIG. 1 , FIG. 3A , FIG. 3B and FIG. 4 together. 1 is a functional block diagram of an auxiliary focusing device according to an embodiment of the present invention; FIG. 3A is a schematic diagram of the relative relationship between the first distance, the second distance and the focus distance according to an embodiment of the present invention; FIG. 3B is another schematic diagram according to the present invention. A schematic diagram of the relative relationship between the first distance, the second distance and the focus distance according to an embodiment and FIG. 4 is a schematic diagram of an auxiliary focusing method according to an embodiment of the present invention. As shown in FIG. 1 , the focusing aid device 1 includes an image capturing module 10 , an image processing module 12 and a storage module 14 . The image processing module 12 is coupled to the image capture module 10 and the storage module 14 .

The image capturing module 10 is used for capturing a first real-time image at a first distance D1 relative to the subject and capturing a second real-time image at a second distance D2 relative to the subject. In other words, the image capturing module 10 can capture real-time images of the object to be photographed at different positions. In practice, the image capture module 10 can be a camera lens with a single focal length, a video camera lens, a network camera lens, or other suitable photographic equipment. In addition, the image capture module 10 further includes an image sensor (image sensor) made of charge coupled device (CCD) or complementary metal oxide semiconductor (CMOS). , but the present invention is not limited to the above description.

The image processing module 12 is used for calculating the sharpness value of the first real-time image and the sharpness value of the second real-time image respectively, comparing the sharpness value of the first real-time image and the sharpness value of the second real-time image and sending a notification signal. The notification signal indicates the relative relationship between the first distance D1, the second distance D2 and the focal distance D4. In one example, after the image processing module 12 calculates the sharpness value of the real-time image received for the first time, it temporarily stores the calculated sharpness value in the storage module 14 . Next, the image processing module 12 calculates the sharpness value of the real-time image received for the second time, and temporarily stores the calculated next sharpness value in the storage module 14 .

Next, when the image processing module 12 takes it out from the storage module 14 and compares the two sharpness values, the one with the larger sharpness value of the real-time image is regarded as the next real-time image (for example, the third distance D3 away from the object to be photographed). Three real-time images) the threshold value of the sharpness value. The comparison result represents the gap between the distance of the auxiliary focusing device 1 relative to the subject and the focal distance D4 for photographing the subject. More specifically, it refers to the difference between the position of the auxiliary focusing device 1 and the position of the auxiliary focusing device 1 when the subject is in focus, and a corresponding notification signal is transmitted according to the comparison result. As shown in FIG. 3A and FIG. 3B , when the first distance D1 is greater than the second distance D2, the first signal will be transmitted to notify the user that the focus distance D4 is far away; when the first distance D1 is smaller than the second distance D2, the first signal will be transmitted. The second signal is used to notify the user that the focus distance D4 is approaching. In addition, when the third distance D3 is less than the threshold value and when the third distance D3 is greater than the threshold value, the first signal and the second signal will be transmitted respectively, and when the third distance D3 is equal to the focal distance D4, then A third signal is sent to notify the user to reach the focus distance D4. Since the calculation of the sharpness value of the real-time image is well known to those skilled in the art, details are not repeated here.

Not only that, the notification signal can be displayed and sent to the display interface, through a light source, a sound source, or sent to the calculator device. The calculator device can send corresponding signals to the image application program by accepting different types of notification signals , which is used to inform the user of the corresponding relationship between the distance to the subject and the distance of the focus distance D4 for photographing the subject. In practice, the calculator device can be a computer, a notebook computer, a smart phone or a tablet computer, and the image processing module 12 can be a microprocessor (micro processor) or a graphics processing unit (graphics processing unit), and the storage module 14 can be It is a kind of programmable read-only memory (programmable read-only memory, PROM), erasable programmable read-only memory (erasable programmable read-only memory, EPROM), electrically erasable programmable read-only memory (electrically erasable Programmable read-only memory (EEPROM), flash memory (flash memory) and other non-volatile memory (non-volatile memory), but the present invention is not limited thereto.

In practice, the focusing aid device 1 further includes a power supply module 16 , and the power supply module 16 is used to provide electric energy to the image capture module 10 , the image processing module 12 and the storage module 14 . The power supply module 16 can be a battery module such as a solar cell or a fuel cell, and can also be an AC circuit module, including an AC power supply, a set of AC/DC converters (AC/DC converter) for changing the current waveform, and a set of A DC chopper for adjusting the charging current, but the present invention is not limited thereto.

For the method in an embodiment of the present invention, please refer to FIG. 1 , FIG. 2 and FIG. 4 together. FIG. 2 is a flowchart of a method according to an embodiment of the present invention. As shown in step S200 , the image capture module 10 captures a first real-time image at a first distance D1 relative to the object to be photographed. As shown in step S202 , the image processing module 12 calculates the sharpness value of the first real-time image and stores it in the storage module 14 . As shown in step S204 , the image capture module 10 captures a second real-time image at a second distance D2 relative to the object to be photographed. As shown in step S206 , the image processing module 12 calculates the sharpness value of the second real-time image, and stores the result in the storage module 14 .

Here, when the auxiliary focus device 1 moves from one position (for example, the first distance D1 from the subject) to another position (for example, the second distance D2 from the subject), the image capture module 10 is thus different. The real-time image of the object to be photographed is captured at a position, and the real-time image is sent to the image processing module 12, and then the image processing module 12 calculates the sharpness values of the real-time images at different positions respectively.

It is worth mentioning that the order of the above steps S200 to S206 can be interchanged, that is, the image capture module 10 can first capture the real-time images of the first distance D1 and the second distance D2, and then the image processing module 12 can directly calculate the first The sharpness value of the real-time image and the second real-time image.

As shown in step S208, the image processing module 12 compares the sharpness value of the first real-time image and the sharpness value of the second real-time image, and transmits a notification signal according to the relative relationship between the first distance D1, the second distance D2 and the focus distance D4 . As shown in step S210, when the sharpness value of the first real-time image is greater than the sharpness value of the second real-time image, that is, the difference between the first distance D1 and the focus distance D4 is smaller than the difference between the second distance D2 and the focus distance D4 In the case of , transmit a notification signal. More specifically, when moving to the second distance D2 is in the opposite direction to the focal length direction, the sharpness value of the real-time image captured at this position will be sharper than that of the real-time image captured last time When the degree value is low, that is, the difference between the second distance D2 and the focal distance D4 increases. At this time, the image processing module 12 transmits a first signal to notify the user that the focus distance D4 of the object to be photographed is far away from the auxiliary focusing device 1, and sets the sharpness value of the previous real-time image as a threshold value for following Compare the sharpness value of a live image.

As shown in step S212, when the sharpness value of the first real-time image is smaller than the sharpness value of the second real-time image, that is, the difference between the first distance D1 and the focus distance D4 is greater than the difference between the second distance D2 and the focus distance D4 In the case of , transmit a notification signal. In other words, when the direction moving to the second distance D2 is toward the focus direction, the sharpness value of the real-time image captured at this position will be higher than the sharpness value of the real-time image captured last time is high, that is, the difference between the second distance D2 and the focal distance D4 decreases. At this time, the image processing module 12 transmits a second signal to inform the user that the focus distance D4 of the object to be photographed is approaching the auxiliary focusing device 1, and the sharpness value of this real-time image is set as a threshold value to keep up with the next one. Live image sharpness values for comparison.

As shown in step S214 , the image capture module 10 captures a third real-time image at a third distance D3 relative to the object to be photographed. As shown in step S216 , the image processing module 12 calculates the sharpness value of the third real-time image and stores it in the storage module 14 . As shown in step S218, compare whether the third real-time image is greater than the threshold value, and when the sharpness value of the third real-time image is greater than the threshold value, the sharpness value of the third real-time image replaces the threshold value to compare the next real-time image The threshold value of the sharpness value, and the second signal is sent through the image processing module 12 to notify the user of the focus distance D4 of the subject being approached by the auxiliary focusing device 1 for shooting.

As shown in step S220, when the sharpness value of the third real-time image is not greater than the threshold value, it is determined whether the sharpness value is equal to the threshold value. As shown in step S222, when the sharpness value of the third real-time image is smaller than the threshold value, it is used to indicate that the difference between the second distance D2 and the focus distance D4 increases, and the threshold value is the maximum sharpness value of the moving area. In other words, when getting closer to the focal distance D4, the sharpness value of the captured real-time image will gradually increase, and until the focal distance D4 is exceeded, the sharpness value will gradually decrease. Therefore, if the next capture The sharpness value of the real-time image is smaller than the threshold value, which means that the threshold value is the maximum sharpness value in this moving area.

As shown in step S224, when the sharpness value of the third real-time image is equal to the maximum sharpness value of the moving area, the notification signal indicates that the third distance D3 is the focus distance D4. More specifically, after obtaining the maximum sharpness value of the moving area, when the sharpness value of one of the real-time images captured subsequently is equal to the maximum sharpness value, it means that the position of the captured real-time image is moving. The best focus distance D4 in the area, at this time, the image processing module 12 transmits a third signal to inform the user that the best focus distance D4 has been moved to shoot the subject.

Here is an example of the present invention to illustrate the overall process. When the user opens the corresponding image application program of the network camera, the network camera first captures the real-time image of the object to be photographed, and calculates the sharpness value of the real-time image, and then the user starts Mobile webcam. At this time, the network camera captures a real-time image of another object to be photographed through the change in position, and compares the sharpness value of the real-time image moving this time with the sharpness value of the previous real-time image. If it moves away from the focus distance of the network camera, a first notification signal (first signal) is sent to inform the user that the focus position of the object to be photographed is moving away from it. If it moves toward the focus distance direction of the network camera, a second notification signal (second signal) is sent to inform the user that the camera is approaching the focus position of the object to be photographed. When the user moves in the direction of the focus position and crosses the focus position, the sharpness value of the real-time image will gradually decrease. At this time, the maximum sharpness value of the real-time image within the moving range is found, and the shooting target is also found. Best focus position, when the user moves to the focus position, the network camera will send a third notification signal (third signal) to notify the user to reach the best shooting distance.

To sum up, the present invention captures real-time images at different distances relative to the object to be photographed by the image capture device, and the image processing device calculates the sharpness value of the captured real-time images and compares the sharpness value to judge the current time. The distance to the subject is closer to or farther from the focus distance of the subject than the previous distance to the subject, and different types of images are sent according to the relative relationship between the distance this time and the focus distance of the subject. Notification signal to assist the user in focusing.

Certainly, the present invention also can have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the protection scope of the claims of the present invention.

Claims (8)

1. a kind of auxilary focusing method, it is characterised in that including：

One first real-time imaging is captured in one first distance of a relative thing to be taken the photograph；

Calculate the sharp keen angle value of first real-time imaging；

One second real-time imaging is captured in a second distance of the relative thing to be taken the photograph；

Calculate the sharp keen angle value of second real-time imaging；And

Compare the sharp keen angle value of first real-time imaging and the sharp keen angle value of second real-time imaging and transmit a notification signal, should Notification signal represents the relativeness of first distance, the second distance and a focal length,

Wherein, when the sharp keen angle value of first real-time imaging is more than the sharp keen angle value of second real-time imaging, this is first real-time The sharp keen angle value of image is a threshold value of the sharp keen angle value for comparing one the 3rd real-time imaging, the 3rd real-time imaging be subtracted in With respect to one the 3rd distance of the thing to be taken the photograph,

When the sharp keen angle value of first real-time imaging is less than the sharp keen angle value of second real-time imaging, second real-time imaging Sharp keen angle value is the threshold value for the sharp keen angle value for comparing the 3rd real-time imaging, and the 3rd real-time imaging is subtracted to be somebody's turn to do in relative 3rd distance of thing to be taken the photograph.

2. auxilary focusing method according to claim 1, it is characterised in that when the sharp keen angle value of the 3rd real-time imaging is small When the threshold value, the threshold value is in the maximum sharpness value of a moving area.

3. auxilary focusing method according to claim 2, it is characterised in that when sharp keen angle value of the 3rd real-time imaging etc. When the maximum sharpness value of the moving area, the notification signal represents that the 3rd distance is the focal length.

4. auxilary focusing method according to claim 1, it is characterised in that the notification signal is shown in a display interface On.

5. a kind of auxiliary focusing mechanism, it is characterised in that include：

One image acquisition module, captures one first real-time imaging in one first distance of a relative thing to be taken the photograph and waits to take the photograph in relative this One second distance of thing captures one second real-time imaging；And

One image processing module, couples the image acquisition module, and the image processing module calculates the sharp keen of first real-time imaging The sharp keen angle value of angle value and second real-time imaging, compares the sharp keen angle value and second real-time imaging of first real-time imaging Sharp keen angle value simultaneously transmits a notification signal, and the notification signal represents the first distance, the phase of the second distance and a focal length To relation,

Wherein, when the image processing module judges that the sharp keen angle value of the first real-time imaging is more than the sharpness of second real-time imaging During value, the sharp keen angle value of first real-time imaging is a threshold value of the sharp keen angle value for comparing one the 3rd real-time imaging, the 3rd Real-time imaging is subtracted in one the 3rd distance of the relative thing to be taken the photograph,

When the image processing module judges that the sharp keen angle value of the first real-time imaging is less than the sharp keen angle value of second real-time imaging, The sharp keen angle value of second real-time imaging is the threshold value for the sharp keen angle value for comparing the 3rd real-time imaging, the 3rd real-time shadow As being subtracted in the 3rd distance of the relative thing to be taken the photograph.

6. auxiliary focusing mechanism according to claim 5, it is characterised in that when the image processing module judges that the 3rd is real When image sharp keen angle value be less than the threshold value when, the threshold value be in the maximum sharpness value of a moving area.

7. auxiliary focusing mechanism according to claim 6, it is characterised in that when the image processing module judges that the 3rd is real When image sharp keen angle value be equal to the moving area maximum sharpness value when, the notification signal represent the 3rd distance be Jiao Point distance.

8. auxiliary focusing mechanism according to claim 5, it is characterised in that the notification signal is shown in a display interface On.