TWI578785B - Photographic device and photographic method - Google Patents

Description

Photographing device and photographing method

The invention relates to a photographing device and a photographing method, in particular to a photographing device and a photographing method capable of automatically removing excess lines such as moiré in a photograph.

When users watch content displayed on TV, computer or outdoor LED display screens, they often want to share the pictures they see to friends. The most common way to do this is to take out the contents of the display screen with your mobile phone or camera and share it with your friends. However, we will find that the screen of the display screen shot with a mobile phone or camera often has extra stripes such as moiré, which seriously affects the shooting effect.

In view of this, it is necessary to propose a new type of photographing device and photographing method to solve the above problems.

A photographing device has an image capturing unit that acquires a picture with an aperture and a focus distance. The camera device further includes an image processing system, the image processing system includes: a detection module, configured to detect whether there is a moiré in the image acquired by the camera unit; and an adjustment module, configured to detect the module Measuring a moiré in the acquired image, adjusting a combination of a diaphragm and a shutter of the camera unit or a focus distance until the moiré does not exist in the acquired image; and a photographing control module for controlling the camera unit to take a photo .

Wherein, when the detecting module determines that there is no moiré in the picture acquired by the photographing device The camera control module controls the camera unit to directly take a picture.

A photographing method is applied to a photographing device. The photographing device includes an image capturing unit. The photographing method includes the steps of: detecting whether there is a moiré in the image acquired by the photographing device; and determining the combination of the aperture and the shutter or the focusing distance of the image capturing unit when determining the presence of the moiré in the acquired image until the obtaining There is no moiré in the picture; and the camera unit is controlled to take a picture.

The photographing device and the photographing method in the invention can automatically remove excess lines such as moiré, thereby obtaining a better photographing effect, without requiring manual adjustment by the user, making the photographing more simple and more humanized.

100‧‧‧Photographing device

10‧‧‧ camera unit

20‧‧‧ storage unit

30‧‧‧ Processor

40‧‧‧Image Processing System

41‧‧‧ mode selection module

42‧‧‧Detection module

43‧‧‧Adjustment module

44‧‧‧Photo Control Module

S301~S303‧‧‧Steps

FIG. 1 is a schematic diagram of functional modules of a photographing apparatus according to an embodiment of the present invention.

2 is a schematic diagram of a module of an image processing system in a photographing apparatus according to an embodiment of the present invention.

FIG. 3 is a flowchart of a photographing method according to an embodiment of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of functional modules of a photographing apparatus 100 according to a preferred embodiment of the present invention. In the present embodiment, the photographing apparatus 100 includes an imaging unit 10, a storage unit 20, a processor 30, and an image processing system 40. The camera unit 10 is used to take a photo, which includes a lens, a shutter, an aperture, an image sensor, and the like, which are generally included in a camera. It can be understood that the camera unit 10 can also include other structures. Since it is not the focus of the present invention, it will not be described herein. In the embodiment, the camera device 100 may be a camera, or may be a portable electronic device such as a mobile phone or a tablet computer, but is not limited thereto.

The storage unit 20 stores a plurality of photographing modes suitable for a plurality of different photographing scenarios. In this embodiment, the photographing mode includes a shooting screen mode, and the shooting screen mode is suitable for shooting a content displayed on a screen such as a television screen, a mobile phone screen, or an outdoor LED display screen. It can be understood that the photographing mode may also include an existing landscape mode, a night scene mode, a character mode, a macro mode, a sports mode, and the like, but is not limited thereto.

Referring to FIG. 2 , the image processing system 40 includes a plurality of function modules, which are module modules stored in the storage unit 20 and executable by the processor 30 . In this embodiment, the function modules include a mode selection module 41, a detection module 42, a determination module 43, an adjustment module 44, and a photographing control module 45. In this embodiment, the processor 30 can be a central processing unit (CPU), a microprocessor, or other data processing chip.

The mode selection module 41 is configured to control the camera device 100 to enter a camera mode selected by the user in response to the user's operation after the camera unit 10 in the camera device 100 is activated. In the embodiment, when the user selects the shooting mode by triggering the mode selection button in the camera device 100, the mode selection module 41 controls the camera device 100 to enter the shooting mode in response to the user's operation.

In this embodiment, the user can enter the corresponding photographing mode by triggering a mode selection button (not shown) in the photographing device 100 or a selection icon in a touch screen (not shown).

In other embodiments, the mode selection module 41 can automatically recognize the object currently being photographed by the camera unit 10 after the camera unit 10 in the camera device 100 is activated, automatically select a photographing mode, and automatically control the photographing device 100. Enter the selected photo mode.

When shooting a digital image, if there is a dense texture in the object being photographed, there are often inexplicable stripes like water waves and abnormal colors. This is the moiré. This phenomenon may occur when a detailed pattern on an object, such as a line on a garment or an image with closely spaced parallel lines overlapping the pattern of the photosensitive element on the image sensor. In the field of digital imaging, moiré has always been a difficult problem to solve.

The detecting module 42 is configured to detect whether a picture obtained in the lens of the photographing device 100 has a moiré after the photographing device 100 enters the shooting mode.

In the embodiment, one or more moiré picture templates are pre-stored in the storage unit 20, and the one or more moiré picture templates are black and white image modes, and various moiré patterns exist in each picture template. Style. The detecting module 42 detects whether a moiré appears in the picture: converting the picture image acquired by the camera device 100 into a black and white image mode, converting the image into a black and white mode and the storage unit 20 The stored one or more moiré picture templates are compared. When the image converted to the black and white mode and the picture template stored in the storage unit 20 are greater than a preset value, the detecting module 42 determines the lens. Moiré appears in the captured image. When the image converted to the black and white mode and the image template stored in the storage unit 20 are less than a preset value, the detecting module 42 determines that no moiré appears in the image acquired by the lens.

In other embodiments, the screen image acquired by the detecting module 42 for the camera device 100 is converted to a black and white image when only a part of the area may have a moiré appearing in the image captured by the camera 100. After the mode, the plurality of image regions are first divided, and each of the divided image regions is respectively compared with one or more moiré image templates stored in the storage unit 20, and one of the image regions and the save When the one or more moiré picture template similarities stored in the storage unit 20 are greater than a preset value, the detecting module 42 determines that the image area has a moiré appearing, and further determines that the image acquired by the lens has a mole. The pattern appears. By dividing the image regions and then comparing them, the detection module 42 can be improved to determine the accuracy of the moiré.

When the detecting module 42 determines that no moiré appears in the image acquired by the lens, the photographing control module 44 controls the photographing unit 10 to perform a normal photo taking process.

When the detecting module 42 determines that a moiré appears in the image acquired by the lens, the adjusting module 43 acquires a combination of the current aperture and the shutter of the photographing device 100 to obtain an exposure value, and then according to The resulting exposure value is selected for another combination of aperture and shutter and the current aperture and shutter combination is changed to a newly selected combination of aperture and shutter.

After the adjustment module 43 selects and changes the combination of the other apertures and the shutters, after the lens of the camera device 100 acquires the image, the detection module 42 detects whether the image acquired in the lens of the camera device 100 is detected again. Moiré appears, if a moiré appears, the judging module 43 continues to select another combination of the aperture and the shutter having the same exposure value, so that the lens of the photographing device 100 continues to acquire the image until the detection The module 42 detects that the acquired picture has no moiré.

In an embodiment, the adjustment module 43 adjusts the aperture value of the camera device 100 to a preset value, which may be the aperture maximum of the camera device 100. In this way, the sharpness of the photograph will be reduced, thereby achieving the purpose of eliminating moiré.

When the adjustment module 43 still cannot remove the moiré after adjusting the combination of the aperture or the shutter of the photographing device 100, the adjustment module 43 sets the focus position of the photographing device 100 within a clear depth of field of the acquired image. Move forward or backward one A predetermined value, such as moving the focus position forward by 3 cm or moving backward by 3 cm. In this way, the purpose of eliminating moiré in the photo can be achieved. The adjusting module 43 determines whether the currently acquired picture is clear or not, and may perform the method for determining the image sharpness in the prior art, for example, determining the sharpness of the image by using an algorithm of the Sobel operand in the airspace. Or an algorithm such as FFT transform is used in the frequency domain to detect the sharpness of the image. Since the above method is a prior art for detecting image sharpness in the art, it will not be described in detail herein.

It can be understood that, in other embodiments, the adjustment module 43 does not need to adjust the aperture and the shutter of the photographing device 100, but directly moves the focus position of the photographing device 100 forward or backward by a predetermined value.

The camera control module 44 is configured to control the camera unit 10 to take a picture after the adjustment module 43 adjusts the aperture, shutter or focus position of the camera device 100.

Please refer to FIG. 3 , which is a flowchart of a photographing method according to an embodiment of the present invention. In this embodiment, the photographing method includes the following steps:

S301: The detecting module 42 detects whether there is a moiré in the picture acquired in the lens of the photographing device 100. If yes, go to step S302; if no, go to step S303.

In an embodiment of the present invention, the detecting module 42 detects whether there is a moiré in the picture: converting the picture image acquired by the camera device 100 into a black and white image mode, and converting the image into a black and white mode. Comparing the image with one or more moiré picture templates stored in the storage unit 20, when the image converted to the black and white mode and the picture template stored in the storage unit 20 are greater than a preset value, the image The detecting module 42 determines that moiré appears in the picture acquired by the lens. When the conversion is black and white When the similarity between the image and the image template stored in the storage unit 20 is less than a preset value, the detection module 42 determines that no moiré appears in the image acquired by the lens.

In other embodiments, for the picture acquired in the lens of the camera device 100, the detection module 42 may convert the picture image acquired by the camera device 100 into a black and white picture when only a part of the area may have a moiré. After the image mode, the plurality of image regions are first divided, and each of the divided image regions is respectively compared with one or more moiré image templates stored in the storage unit 20, and one of the image regions and the storage unit When the one or more moiré image templates stored in the 20 are greater than the preset value, the detecting module 42 determines that the moiré appears in the image region, and further determines that the moiré appears in the image acquired by the lens. .

S302: The adjustment module 43 adjusts the combination or focus distance of the aperture and the shutter of the imaging unit until there is no moiré in the acquired picture.

Specifically, the adjustment module 43 acquires a combination of the current aperture and the shutter of the photographing device 100 to obtain an exposure value, and then selects another combination of the aperture and the shutter according to the obtained exposure value and the current The aperture and shutter combination is changed to a newly selected combination of aperture and shutter until no moiré appears in the acquired picture.

When the adjustment module 43 still cannot remove the moiré after adjusting the combination of the aperture or the shutter of the photographing device 100, the adjustment module 43 sets the focus position of the photographing device 100 within a clear depth of field of the acquired image. Move forward or backward by a predetermined value.

S303: The camera control module 44 controls the camera unit 10 to take a photo.

In an embodiment of the present invention, the photographing method further includes: before step S301: After the camera unit 10 in the camera device 100 is activated, the mode selection module 41 controls the camera device 100 to enter the shooting mode in response to the user's operation.

In an embodiment of the present invention, the adjusting module 43 determines whether the currently acquired picture is clear or not, and may be performed by using a method for determining the image sharpness in the prior art, for example, by using an algorithm of the Sobel operand in the airspace. The sharpness of the image, or an algorithm such as FFT transform in the frequency domain, is used to detect the sharpness of the image.

While the preferred embodiment of the invention has been shown and described, it will be understood Therefore, it is intended that the invention not be limited to the embodiments disclosed herein,

S301~S303‧‧‧Steps

Claims (8)

A camera device has a camera unit that acquires a picture with an aperture and a focus distance. The camera device further includes an image processing system, and the image processing system includes: a detection module, configured to: Detecting whether there is a moiré in the image acquired by the camera unit; and adjusting the module, when the detecting module detects the presence of moiré in the acquired image, adjusting the combination of the aperture and the shutter of the camera unit until the acquisition There is no moiré in the picture, wherein the adjustment module adjusts the aperture of the camera device to the maximum aperture and adjusts a shutter correspondingly, wherein the aperture shutter combination before and after adjustment has the same exposure value; and the camera control module, It is used to control the camera unit to take a picture. The camera device of claim 1, wherein the camera device further includes a storage unit, wherein the storage unit stores one or more black and white mode moiré image templates, and the detection module is further used for Converting the picture image acquired by the camera device into a black and white mode, and comparing the image converted to the black and white mode with the stored one or more black and white mode moiré picture templates, when the similarity is greater than the pre When the value is set, the detection module determines that there is a moiré on the acquired image. The photographing device of claim 1, wherein the detecting module converts the image image acquired by the photographing device into a black-and-white image mode, first splits the plurality of image regions, and then separately divides the image regions. The image area is compared with one or more black and white mode moiré picture templates stored in the storage unit, and one of the image areas is more similar to one or more black and white mode moiré picture templates stored in the storage unit When the preset value is used, the detection module determines that there is a moiré in the image area. A photographing device having an image capturing unit with an aperture and a focusing distance The image capturing device further includes an image processing system, the image processing system includes: a detecting module, configured to detect whether there is a moiré in the image captured by the camera unit; and adjusting the module When the detecting module detects that there is a moiré in the acquired image, adjusting the focusing distance of the camera unit until there is no moiré in the acquired image, wherein the adjusting module sets the focusing distance of the photographing device at A predetermined value is moved forward or backward within a clear depth of field of the photograph; and a photographing control module for controlling the photographing unit to take a photograph. A photographing method is applied to a photographing device, the photographing device includes an image capturing unit, and the improvement comprises the steps of: detecting whether there is a moiré in the image acquired by the photographing device; and determining that the acquired image exists In the case of moiré, adjusting the combination of the aperture and the shutter of the camera unit until there is no moiré in the acquired picture, including: adjusting the aperture of the camera device to the maximum aperture and correspondingly adjusting a shutter, wherein the aperture shutter is adjusted before and after The combination has an identical exposure value; and the camera unit is controlled to take a picture. The photographing method of claim 5, wherein the method further comprises: converting the image of the image acquired by the photographing device into a black and white mode; converting the image into a black and white mode with one or more pre-stored images; The black and white mode moiré picture template is compared; and when the image converted to the black and white mode and the stored picture template are greater than the preset value, it is determined that the picture acquired by the lens has a moiré. The photographing method of claim 5, wherein the method further comprises: when it is determined that there is no moiré in the picture acquired by the photographing device, controlling the camera unit to directly take a photograph. A photographing method is applied to a photographing device, the photographing device includes an image capturing unit, and the improvement comprises the steps of: detecting whether there is a moiré in the image acquired by the photographing device; and detecting the acquired image When there is moiré, adjusting the focusing distance of the camera unit until there is no moiré in the acquired picture, including: moving the focusing distance of the photographing device forward or backward by a predetermined value within a clear depth of field of the photograph; and controlling the The camera unit takes a picture.