TWI495920B - Device and method for assistant focusing - Google Patents

Description

Auxiliary focusing device and method

The present invention relates to an auxiliary focusing apparatus and method, and more particularly to an auxiliary focusing apparatus and method having a single focal length.

At present, there are many kinds of cameras on the market. For the focus function, it can be divided into a camera with auto focus function and no auto focus function. When the camera with auto focus function is used, the user only needs to tap the shutter to start auto focus. After the camera automatically aligns to the focal length and then presses the shutter, you can take a clear picture. However, when using a camera without focus function, the user should select the appropriate focal length for the subject by rotating the focus ring on the lens. After the eye confirms that the image of the subject in the viewing window is clear, press the shutter to take the photo. .

However, if the lens cannot select a different focal length, that is, when the lens has only a single focal length, the user needs to find the focal length of the lens by moving the position, and the image of the object to be viewed from the view window is moved by the position. After the blur becomes clear, stop moving and press the shutter to take a picture. However, if there is no device for assisting focusing, it is inconvenient for the user to judge the appropriate moving direction or distance.

In view of the above problems, the present invention provides a multimedia management device, a multimedia management method, and a computer readable medium for executing a multimedia management method, which can help a user to know which multimedia files by displaying a play record on a play media interface. Image frame Has been viewed by other users.

According to the auxiliary focusing device disclosed in the present invention, the auxiliary focusing device has an image capturing module and an image processing module. The image capturing module is configured to capture a first instant image at a first distance relative to the object and a second instant image at a second distance from the object to be viewed. The image processing module is coupled to the image capturing module, and the image processing module is configured to calculate a sharpness value of the first instant image and a sharpness value of the second instant image, and compare the sharpness value of the first instant image with the first The sharpness value of the instant image is transmitted and the notification signal is transmitted, and the notification signal indicates the relative relationship between the first distance, the second distance, and the focal length.

According to the auxiliary focusing method disclosed in the present invention, the first instant image is captured at a first distance from the object to be inspected. Calculate the sharpness value of the first live image. The second instant image is captured at a second distance from the object to be inspected. Calculating a sharpness value of the second real-time image, comparing a sharpness value of the first real-time image and a sharpness value of the second real-time image, and transmitting a notification signal, where the notification signal indicates a relative relationship between the first distance, the second distance, and the focal length .

In summary, the present invention can determine the sharpness value of the instant image by comparing the different distances from the object to be inspected, thereby judging that the distance from the object to be photographed is compared with the last time relative to the object to be photographed. The distance of the object is close to or away from the focus distance of the object to be photographed, and different types of notification signals are transmitted according to the relative relationship between the distance from the object to be photographed and the focal distance of the object to be photographed, thereby assisting The user focuses.

The above description of the present invention and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention.

1‧‧‧Auxiliary focusing device

10‧‧‧Image capture module

12‧‧‧Image Processing Module

14‧‧‧Storage module

16‧‧‧Power supply module

D1‧‧‧First distance

D2‧‧‧Second distance

D3‧‧‧ third distance

D4‧‧‧Focus distance

1 is a functional block diagram of an auxiliary focus device in accordance with an embodiment of the present invention.

2 is a flow chart of an assist focus method in accordance with an embodiment of the present invention.

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

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

4 is a schematic diagram of an auxiliary focusing method according to an embodiment of the present invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

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, and FIG. 3A is a schematic diagram showing a relative relationship between a first distance, a second distance, and a focal length according to an embodiment of the present invention, and a 3B basis. A schematic diagram of a relative relationship between a first distance, a second distance, and a focal length according to another embodiment of the present invention, and a fourth diagram is a schematic diagram of an auxiliary focusing method according to an embodiment of the present invention. As shown in FIG. 1 , the auxiliary focusing 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 capturing module 10 and the storage module 14 .

The image capturing module 10 is configured to capture the first distance D1 from the object to be inspected An instant image and a second instant image is captured at a second distance D2 relative to the object to be viewed. In other words, the image capturing module 10 can capture an instant image of the object at different locations. In practice, the image capture module 10 can be a camera lens with a single focal length, a camera lens, a network camera lens, or other suitable photographic device. In addition, the image capturing module 10 further includes an image sensor made of a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Image sensor), but the present invention is not limited to the above description.

The image processing module 12 is configured to respectively calculate the sharpness value of the first instant image and the sharpness value of the second instant image, and compare the sharpness value of the first instant image with the sharpness value of the second instant image and transmit the notification signal. . The notification signal indicates the relative relationship between the first distance D1, the second distance D2, and the focal length D4. In one example, after the image processing module 12 calculates the sharpness value of the first received instant image, the calculated sharpness value is temporarily stored in the storage module 14. Then, the image processing module 12 calculates the sharpness value of the second received real image, and temporarily stores the calculated next sharpness value to the storage module 14.

Then, when the image processing module 12 takes out the storage module 14 and compares the two sharpness values, the larger the sharpness value of the live image is regarded as the next real image (for example, the third distance D3 from the object to be inspected) The third instant image) is the threshold value of the sharpness value. The comparison result represents the difference between the distance of the auxiliary focusing device 1 with respect to the subject and the focal length D4 of the subject to be photographed. More specifically, the difference between the position where the auxiliary focusing device 1 is located and the position where the auxiliary focusing device 1 is located when the subject is in focus, and the corresponding notification signal is transmitted according to the comparison result. As shown in FIGS. 3A and 3B, when the first distance D1 is greater than the second distance D2 A first signal is transmitted to inform the user that the distance D4 is away from the focus distance. When the first distance D1 is smaller than the second distance D2, a second signal is transmitted 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 the third distance D3 is greater than the threshold value, the first signal and the second signal are respectively transmitted, and when the third distance D3 is equal to the focal length D4, then A third signal is sent to inform the user to reach the focus distance D4. Since the calculation of the sharpness value of the live image is well known to those of ordinary skill in the art, it will not be described again.

In addition, the notification signal can be transmitted to the display interface, through the light source, the sound source, or to the computer device. The computer device can transmit the corresponding signal to the image application by receiving different types of notification signals. The corresponding relationship of the distance between the user's distance from the object to be photographed and the focal length D4 of the subject to be photographed is notified. In practice, the computer device can be a computer, a notebook computer, a smart phone, or a tablet computer, and the image processing module 12 can be a micro processor or a graphics processing unit. The module 14 can be a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), and an erasable programmable only A non-volatile memory such as an electrically erasable programmable read-only memory (EEPROM) or a flash memory is used, but the invention is not limited thereto.

In an embodiment, the auxiliary focus device 1 further includes a power supply module 16 for supplying power 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, or an AC circuit module, including an AC power source, a set of AC/DC converters for changing the current waveform, and a set of DCs used to adjust the magnitude of the charging current Chopper, but the invention is not limited thereto.

For the method in one embodiment of the present invention, please refer to FIG. 1 , FIG. 2 and FIG. 4 together. 2 is a flow chart of a method in accordance with an embodiment of the present invention. As shown in step S200, the image capturing module 10 captures the first instant image at a first distance D1 relative to the object to be inspected. As shown in step S202, the image processing module 12 calculates the sharpness value of the first instant image and stores it in the storage module 14. As shown in step S204, the image capturing module 10 captures the second instant image at a second distance D2 relative to the object. As shown in step S206, the image processing module 12 calculates the sharpness value of the second instant image, and stores the result in the storage module 14.

Here, when the auxiliary focusing device 1 moves from one position (for example, the first distance D1 from the object to be taken) to another position (for example, the second distance D2 from the object to be inspected), the image capturing module 10 The instant image of the object to be captured is captured at different locations, and the image is transmitted to the image processing module 12, and then the image processing module 12 calculates the sharpness values of the instant images at different positions.

It is worth mentioning that the sequence of the above steps S200 to S206 can be mutually exchanged, that is, the image capturing 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 calculates the path. The sharpness value of the first instant image and the second live image.

As shown in step S208, the image processing module 12 compares the sharpness value of the first instant image with the sharpness value of the second instant image, and transmits a notification according to the relative relationship between the first distance D1, the second distance D2, and the focus distance D4. signal. As shown in step S210, when the sharpness value of the first instant image is greater than the sharpness value of the second live 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 a notification signal. In more detail, when the direction of moving to the second distance D2 is in the opposite direction to the focal length direction, The sharpness value of the live image of the object to be captured at this position is lower than the sharpness value of the previous captured image, that is, the difference between the second distance D2 and the focus distance D4 is increased. 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 away from the auxiliary focus device 1 and the sharpness value of the previous instant image is set as a threshold value for Compare the sharpness values of the next live image.

As shown in step S212, when the sharpness value of the first instant image is smaller than the sharpness value of the second live 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 a notification signal. In other words, when the direction of moving to the second distance D2 is the direction toward the focal length direction, the sharpness value of the instant image capturing the object at this position is higher than the sharpness value of the previous captured image. It is high, that is, the difference between the second distance D2 and the focal length D4 is reduced. At this time, the image processing module 12 transmits a second signal to notify the user that the focus distance D4 of the object to be photographed is approached by the auxiliary focus device 1 and sets the sharpness value of the instant image to a threshold value to follow Compare the sharpness values of an instant image.

As shown in step S214, the image capturing module 10 captures a third instant image at a third distance D3 relative to the object to be viewed. As shown in step S216, the image processing module 12 calculates the sharpness value of the third instant image and stores it in the storage module 14. As shown in step S218, comparing whether the third instant image is greater than the threshold value, and when the sharpness value of the third real image is greater than the threshold value, the sharpness value of the third real image is replaced by the threshold value to compare the next real image. The threshold value of the sharpness value is transmitted through the image processing module 12 to notify the user that the focus distance D4 of the object to be photographed is approached by the auxiliary focus device 1.

As shown in step S220, when the sharpness value of the third instant image is not greater than the threshold When the value is used, it is judged whether the sharpness value is equal to the threshold value. As shown in step S222, when the sharpness value of the third instant image is less than the threshold value, the difference between the second distance D2 and the focus distance D4 is increased, and the threshold value is the maximum sharpness value of the moving region. In other words, when the distance is closer to the focus distance D4, the sharpness value of the captured real-time image will gradually increase, and the sharpness value will gradually decrease after the focal distance D4 is crossed. Therefore, if the next value is taken, The sharpness value of the live image is less than the threshold value, which means that the threshold value is the maximum sharpness value in the moving area.

As shown in step S224, when the sharpness value of the third live 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 subsequent captured images is equal to the maximum sharpness value, the position of the captured instant image is moved. 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 the subject.

The present invention uses an example to illustrate the overall process. When the user turns on the image application corresponding to the network camera, the network camera captures the instant image of the object and calculates the sharpness value of the instant image. Users then start moving the webcam. At this time, the network camera captures the real-time image of another object through the change of the position, and compares the sharpness value of the moving instant image with the sharpness value of the previous instant image. If it is moving away from the focus distance of the webcam, a second notification signal (second signal) is sent to notify the user that the focus position is away from the subject. If it is moving in the direction of the focus distance close to the webcam, the first notification signal (first signal) is sent to notify the user that the focus position of the subject is approaching. When the user moves in the direction of the focus position and crosses the focus position, the sharpness value of the instant image gradually decreases, and the moving range is found at this time. The maximum sharpness value of the instant image inside, also finds the best focus position for shooting the object. When the user moves to the focus position, the network camera sends a third notification signal (third signal) to notify the user. In order to reach the best shooting distance.

In summary, the present invention captures the sharpness value of the captured instant image by using the image capturing device at different distances from the object to be viewed, and the image processing device calculates the sharpness value of the captured instant image and compares the sharpness value to determine the The distance from the object to the object is closer to or away from the focus distance of the object to be photographed, and different types are transmitted according to the relative relationship between the distance and the focus distance of the object to be photographed. A notification signal that assists the user in focusing.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

Claims (8)

An auxiliary focusing method includes: capturing a first instant image at a first distance relative to a subject; calculating a sharpness value of the first instant image; and capturing a second distance from the object to be photographed a second instant image; calculating a sharpness value of the second instant image; and comparing a sharpness value of the first instant image with a sharpness value of the second instant image and transmitting a notification signal, the notification signal indicating the first a distance, a relationship between the second distance and a focus distance; wherein when the sharpness value of the first instant image is greater than the sharpness value of the second instant image, the sharpness value of the first instant image is a comparison value a threshold value of the sharpness value of the third live image, the third live image is captured at a third distance from the object; wherein the sharpness value of the first instant image is smaller than the second live image The sharpness value of the second instant image is a threshold value comparing the sharpness value of the third live image, and the third live image is captured at the third distance relative to the object . The auxiliary focusing method of claim 1, wherein when the sharpness value of the third instant image is less than the threshold value, the threshold value is a maximum sharpness value of a moving area. The auxiliary focusing method of claim 2, wherein when the sharpness value of the third instant image is equal to the maximum sharpness value of the moving area, the notification signal indicates that the third distance is the focus distance. The auxiliary focusing method of claim 1, wherein the notification signal is displayed on a display interface. An auxiliary focusing device includes: an image capturing module configured to capture a first instant image relative to a first distance of a subject and a second distance relative to the object to capture a second And an image processing module coupled to the image capture module, wherein the image processing module is configured to calculate a sharpness value of the first instant image and a sharpness value of the second instant image, and compare the first Transmitting a notification signal by a sharpness value of the instant image and a sharpness value of the second instant image, the notification signal indicating a relative relationship between the first distance, the second distance, and a focus distance; wherein the image processing mode When the group determines that the sharpness value of the first instant image is greater than the sharpness value of the second real image, the sharpness value of the first instant image is a threshold value comparing the sharpness value of the third real image, the first The third instant image is captured at a third distance from the object to be inspected; wherein when the image processing module determines that the sharpness value of the first instant image is smaller than the sharpness value of the second instant image, the second Instant movie The threshold value comparing the sharpness sharpness value of the third real-time image, the third image is captured in real time the third distance relative to the object to be taken. The auxiliary focusing device of claim 5, wherein when the image processing module determines that the sharpness value of the third instant image is less than the threshold value, the threshold value is a maximum sharpness value of a moving region. The auxiliary focusing device of claim 6, wherein when the image processing module determines that the sharpness value of the third instant image is equal to the maximum sharpness value of the moving area, the notification signal indicates that the third distance is Focus distance. The auxiliary focusing device of claim 5, wherein the notification signal is displayed on a display interface on.