CN105306788B - A kind of noise-reduction method and device of image of taking pictures - Google Patents
A kind of noise-reduction method and device of image of taking pictures Download PDFInfo
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- CN105306788B CN105306788B CN201510713305.1A CN201510713305A CN105306788B CN 105306788 B CN105306788 B CN 105306788B CN 201510713305 A CN201510713305 A CN 201510713305A CN 105306788 B CN105306788 B CN 105306788B
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Abstract
The embodiment of the invention discloses a kind of noise-reduction method and device of image of taking pictures, the described method includes：Corresponding noise reduction coefficient is determined according to current sensitivity value；Noise reduction is carried out to image of taking pictures according to the noise reduction coefficient；The image of taking pictures after output noise reduction.Technical solution provided in an embodiment of the present invention, by determining corresponding noise reduction coefficient according to sensitivity value, the technological means of noise reduction is carried out to image of taking pictures according to the noise reduction coefficient, solve in the prior art when photo environment is brighter, the technical problem of fuzzy pictures caused by noise reduction is still carried out using bigger noise reduction coefficient according to the prior art, it ensure that the clarity that image can reach higher of taking pictures, optimize the noise reduction technology of existing image of taking pictures, meet the growing personalization of people, facilitation image of taking pictures noise reduction demand.
Description
Technical field
The present embodiments relate to image data processing technology field, more particularly to a kind of noise-reduction method for image of taking pictures and
Device.
Background technology
With the continuous development of electronic technology, digital photographing equipment is (for example, digital camera or with digital camera head
Mobile phone etc.) go deep into huge numbers of families, become everybody and record beautiful natural views, the indispensable instrument of data plate life splendid moment.
Noise, is primarily referred to as the process that light is received and exported as reception signal by the photo-sensitive cell of digital photographing equipment
In coarse part in caused image, also refer to the external pixel that should not occur in image, usually produced, seen by electronic interferences
Get up just as image is dirty, be covered with some tiny rough points.
At present, in order to further improve the image quality for image of taking pictures, all kinds of photographing devices can use certain noise reduction algorithm
To filter out unnecessary noise of taking pictures.In the prior art, preferably take pictures effect to obtain, no matter current environmental light brightness
It is high or low, all evil can be gone through very much by what noise suppressed using identical noise reduction coefficient.After Fig. 1 gives noise reduction in the prior art
Take pictures the schematic diagram of image, as shown in Figure 1, since under bright scene, noise suppresses too, to cause useful image information
It is affected by and significantly suppresses, causes entirety to be taken pictures ineffective, the image definition taken is not high, seriously affects use
Experience at family.
The content of the invention
The embodiment of the present invention provides a kind of noise-reduction method and device of image of taking pictures, to optimize the drop of existing image of taking pictures
Make an uproar technology, lifting is taken pictures the clarity of image.
In a first aspect, an embodiment of the present invention provides a kind of noise-reduction method for image of taking pictures, including：
Corresponding noise reduction coefficient is determined according to current sensitivity value；
Noise reduction is carried out to image of taking pictures according to the noise reduction coefficient；
The image of taking pictures after output noise reduction.
In second aspect, an embodiment of the present invention provides a kind of denoising device for image of taking pictures, including：
Noise reduction coefficient determination unit, for determining corresponding noise reduction coefficient according to current sensitivity value；
Noise reduction unit, for carrying out noise reduction to image of taking pictures according to the noise reduction coefficient；
Take pictures image output unit, for image of taking pictures described in exporting after noise reduction.
The embodiment of the present invention is by determining corresponding noise reduction coefficient according to sensitivity value, with according to the noise reduction coefficient pair
Image of taking pictures carries out the technological means of noise reduction, realizes and is dynamically determined noise reduction coefficient progress noise reduction according to sensitivity value, solves
In the prior art when photo environment is brighter, noise reduction is still carried out using bigger noise reduction coefficient according to the prior art and is led
The technical problem of the fuzzy pictures of cause, ensure that the clarity that image can reach higher of taking pictures, and improve the whole of image of taking pictures
Body is taken pictures effect, optimize the noise reduction technology of existing image of taking pictures, and meets the growing personalization of people, facilitation
Take pictures the noise reduction demand of image.
Brief description of the drawings
Fig. 1 is the schematic diagram of the image of taking pictures after noise reduction in the prior art.
Fig. 2 is the flow chart of the noise-reduction method for the image of taking pictures that the embodiment of the present invention one provides；
Fig. 3 be the embodiment of the present invention one provide noise reduction after image of taking pictures schematic diagram；
Fig. 4 is the flow chart of the noise-reduction method of image provided by Embodiment 2 of the present invention of taking pictures；
Fig. 5 is the structure diagram of the denoising device for the image of taking pictures that the embodiment of the present invention three provides.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings to of the invention specific real
Example is applied to be described in further detail.It is understood that specific embodiment described herein is used only for explaining the present invention,
Rather than limitation of the invention.It also should be noted that for the ease of describing, illustrate only in attached drawing related to the present invention
Part rather than full content.It should be mentioned that some exemplary realities before exemplary embodiment is discussed in greater detail
Apply processing or method that example is described as describing as flow chart.Although operations (or step) are described as order by flow chart
Processing, but many of which operation can be implemented concurrently, concomitantly or at the same time.In addition, the order of operations
It can be rearranged.The processing can be terminated when its operations are completed, it is also possible to being not included in attached drawing
Additional step.The processing can correspond to method, function, code, subroutine, subprogram etc..
Embodiment one
Fig. 2 gives the flow chart of the noise-reduction method of the image of taking pictures of the offer of the embodiment of the present invention one, the side of the present embodiment
Method can be performed by the denoising device for image of taking pictures, which can be realized by way of hardware and/or software, described device
It can be arranged on as a part for the mobile terminal with camera function inside the mobile terminal.
As shown in Fig. 2, the noise-reduction method of image provided in this embodiment of taking pictures specifically includes following steps：
Step 101, according to current sensitivity value determine corresponding noise reduction coefficient.
In the present embodiment, it is built-in in mobile terminal to be determined pair according to current sensitivity value for the application program taken pictures
The noise reduction coefficient answered, wherein, the mobile terminal can be that mobile phone, notebook, PAD intelligent terminals, tablet computer etc. are equiped with
The equipment of camera.
Sensitivity ISO, be exactly in simple terms take pictures mobile terminal sensor it is general to the sensitivity of light, ISO values
From 64 to 3200, for higher up to 6400, sensitivity value is higher, and sensor is more sensitive to light, is applicable to dark condition
Under shooting, and say in the case where photographed scene is brighter, relatively lower sensitivity value can be used, in shooting field
Scape is than that in the case of dark, can use relatively higher sensitivity value.But sensitivity value is higher, image quality is poorer, makes an uproar
Point is more.
Wherein, the current sensitivity value of the basis determines that the determination mode in corresponding noise reduction coefficient can be：According to pre-
The sensitivity value and the mapping table of noise reduction coefficient first stored, to determine corresponding noise reduction system according to current sensitivity value
Number, or：Corresponding noise reduction coefficient, the present embodiment are determined using preset algorithm or preset function according to current sensitivity value
This is not limited.
Preferably, which can specifically include：According to current sensitivity value, based on following noise reduction function, determine to correspond to
Noise reduction coefficient：
N=ISO/k,
Wherein, N is noise reduction coefficient, and ISO is sensitivity value, and k is setup parameter.The value of the k can be according to actual conditions
(for example, 50 or 100 etc.) are preset, the present embodiment is without limitation.
Noise reduction is exactly to refer to the noise in image of taking pictures to smooth out in simple terms, corresponding mixed and disorderly noise no longer occurs,
The noise reduction coefficient can be a numerical value, and the more big corresponding noise reduction degree of its value is bigger, and noise is erased more severe.
Step 102, according to the noise reduction coefficient to take pictures image carry out noise reduction.
Preferably, image-signal processor (ISP, Image Signal Processor) can be used to the figure of taking pictures
As carrying out noise reduction, above-mentioned image-signal processor is generally integrated in camera of taking pictures in the form of hardware, and by built in it
Image processing algorithm, to it is described take pictures image carry out noise reduction.According to noise reduction coefficient, image of taking pictures is carried out based on noise reduction algorithm
Noise reduction, wherein, the more big corresponding noise reduction degree of noise reduction coefficient is more severe, and how image of taking pictures is carried out based on various noise reduction algorithms
Noise reduction has been described in the prior art, and the present embodiment is not repeating this.
The image of taking pictures after step 103, output noise reduction.
Fig. 3 give the embodiment of the present invention one offer noise reduction after image of taking pictures schematic diagram.As shown in figure 3, and Fig. 1
Compare, using the noise-reduction method of image provided in this embodiment of taking pictures, corresponding noise reduction coefficient is determined according to current sensitivity
After carrying out noise reduction to image of taking pictures, due to having carried out the noise reduction of suitable real degree according to the noise reduction coefficient, image of taking pictures is avoided
Some detailed information be suppressed in largely noise reduction, ensure that the entirety for image of taking pictures is taken pictures effect, make the figure taken
Image sharpness is higher.
Further, the contrast for image of taking pictures can be increased, the big pixel of brightness is brighter in the image that makes to take pictures, brightness
Small pixel is darker, the clarity for image of being taken pictures with lifting.The contrast for increasing image of taking pictures, can be by suitably adding
EDGE (retouching side) is weighed to realize, naturally it is also possible to increase the contrast for image of taking pictures by some other algorithm.Such as Fig. 3 institutes
Show, as can be seen that hair becomes apparent from and becomes clear in the image of taking pictures after the contrast of image of taking pictures from increase.
The noise-reduction method for the image of taking pictures that the embodiment of the present invention one provides, by determining corresponding drop according to sensitivity value
Make an uproar coefficient, to carry out the technological means of noise reduction to image of taking pictures according to the noise reduction coefficient, realize according to sensitivity value dynamic
Determine that noise reduction coefficient carries out noise reduction, solve in the prior art when photo environment is brighter, still used according to the prior art
Bigger noise reduction coefficient carries out the technical problem of fuzzy pictures caused by noise reduction, ensure that image of taking pictures can reach higher
Clarity, the entirety for improving image of taking pictures takes pictures effect, optimizes the noise reduction technology of existing image of taking pictures, meet people
Growing personalization, facilitation image of taking pictures noise reduction demand.
Embodiment two
Fig. 4 gives the flow chart of the noise-reduction method of image provided by Embodiment 2 of the present invention of taking pictures.It is more than the present embodiment
State and optimize based on embodiment one, not in the present embodiment the details of detailed description referring to above-described embodiment one.In this reality
Apply in example, will determine that corresponding noise reduction coefficient is specifically optimized for according to current sensitivity value：Obtain current sensitivity value；Judge institute
State whether current sensitivity value is less than setting value；When current sensitivity value is less than setting value, determined according to current sensitivity value
Corresponding noise reduction coefficient；When current sensitivity value is greater than or equal to setting value, it is preset value to determine noise reduction coefficient.
Correspondingly, as shown in figure 4, the noise-reduction method of image provided in this embodiment of taking pictures specifically includes following steps：
Step 201, obtain current sensitivity value.
Step 202, judge whether the current sensitivity value is less than setting value, is less than setting in the current sensitivity value
During value, step 203 is performed, otherwise, performs step 204.
The setting value can be set according to actual use situation, and preferable setting value can be 1600.
Step 203, according to current sensitivity value determine corresponding noise reduction coefficient.
When the current sensitivity value is less than setting value, corresponding noise reduction coefficient is determined according to current sensitivity value.
For example, when current sensitivity ISO values are less than 1600, such as, current sensitivity ISO is 100,200,400 or 800
Deng when, corresponding noise reduction coefficient is determined according to current sensitivity value.
The step can specifically include：According to current sensitivity value, based on following noise reduction function, corresponding noise reduction system is determined
Number：
N=ISO/k,
Wherein, N is noise reduction coefficient, and ISO is sensitivity value, and k is setup parameter.The value of the k can be according to actual conditions
(for example, 50 or 100 etc.) are preset, the present embodiment is to this and is not limited.
According to above-mentioned noise reduction function, determine the corresponding noise reduction coefficient of current sensitivity value, drop can be determined more accurately
Make an uproar coefficient, to carry out the noise reduction of suitable real degree, the clarity for the image that ensures to take pictures.
In addition, when sensitivity value is less than setting value, noise reduction coefficient can also be determined as a value prestored compared with
Small noise reduction coefficient, to carry out lesser degree of noise reduction.
Step 204, determine that noise reduction coefficient is preset value.
When the current sensitivity value is greater than or equal to setting value, it is preset value to determine noise reduction coefficient.
For example, when current sensitivity ISO values are greater than or equal to 1600, for example during 1600 or 3200 grade, determine noise reduction system
Number is preset value.
Wherein, the preset value is a bigger noise reduction coefficient of the value prestored, largely to be dropped
Make an uproar.
Step 205, according to the noise reduction coefficient to take pictures image carry out noise reduction.
It will be appreciated by persons skilled in the art that the noise for image of taking pictures can synchronously increase with increasing for sensitivity value
It is more, so in the case where sensitivity value is relatively low, since light-inletting quantity is more sufficient, sensitivity ISO can not have to it is so high, and one
As during being taken pictures using mobile terminal, sensitivity ISO is generally below 1600, so noise reduction degree relatively small one
Relatively good effect of taking pictures can be reached a bit.So by when sensitivity value is smaller, according to sensitivity value by noise reduction coefficient
It is determined as less value, to carry out the noise reduction of lower degree, when sensitivity value is larger, noise reduction coefficient is determined as larger
Value, to carry out the noise reduction of higher degree, can determine suitable noise reduction coefficient according to current sensitivity value, carry out suitable real degree
Noise reduction, ensure the take pictures overall effect and clarity of image.
The image of taking pictures after step 206, output noise reduction.
The present embodiment is when sensitivity is smaller, it is to be appreciated that current scene may be brighter, and image of taking pictures
Noise it is relatively fewer, corresponding noise reduction coefficient is determined according to current sensitivity, the noise reduction coefficient is smaller, carry out lower degree
Noise reduction, can prevent from suppressing to take pictures while noise reduction from bringing some useful detailed information in image the problem of, Er Qiefang
A little noises come out, and can't see under bright scene, but the resolution detail of image of taking pictures are obtained bigger
Embody and lifting, also improve view picture and take pictures the clarity of image；When sensitivity is larger, the noise of the image of taking pictures is opposite
It is more, noise reduction coefficient is determined as to larger preset value, to carry out the noise reduction of higher degree, removes the noise in image of taking pictures,
Improve the quality for image of taking pictures.
The noise-reduction method of image provided in this embodiment of taking pictures, by when current sensitivity value is less than setting value, according to
Current sensitivity value determines corresponding noise reduction coefficient；When current sensitivity value is greater than or equal to setting value, noise reduction coefficient is determined
For preset value, realize and noise reduction coefficient dynamically adjusted according to current sensitivity value, with according to the noise reduction coefficient to figure of taking pictures
Technological means as carrying out noise reduction, solves in the prior art when photo environment is brighter, is still used according to the prior art
Bigger noise reduction coefficient carries out the technical problem of fuzzy pictures caused by noise reduction, ensure that image of taking pictures bright or not
Under bright scene, the noise reduction of suitable real degree can be carried out according to the noise reduction coefficient, the entirety for improving image of taking pictures is taken pictures
Effect, makes the clarity that image has reached higher of taking pictures, and optimizes the noise reduction technology of existing image of taking pictures, and meets people day
The personalization of benefit growth, the noise reduction demand of the image of taking pictures of facilitation.
Embodiment three
Fig. 5 gives the structure diagram of the denoising device of the image of taking pictures of the offer of the embodiment of the present invention three.Such as Fig. 5 institutes
Show, the denoising device of image provided in this embodiment of taking pictures includes：
Noise reduction coefficient determination unit 51, for determining corresponding noise reduction coefficient according to current sensitivity value；
Noise reduction unit 52, for carrying out noise reduction to image of taking pictures according to the noise reduction coefficient；
Take pictures image output unit 53, for image of taking pictures described in exporting after noise reduction.
Optionally, the noise reduction coefficient determination unit is specifically used for：
When current sensitivity value is less than setting value, corresponding noise reduction coefficient is determined according to current sensitivity value；
When current sensitivity value is greater than or equal to setting value, it is preset value to determine noise reduction coefficient.
Optionally, the noise reduction coefficient determination unit is specifically used for：
According to current sensitivity value, based on following noise reduction function, corresponding noise reduction coefficient is determined：
N=ISO/k,
Wherein, N is noise reduction coefficient, and ISO is sensitivity value, and k is setup parameter.
Optionally, it is described to be specifically used for according to the noise reduction unit：
Noise reduction is carried out to image of taking pictures using image-signal processor according to the noise reduction coefficient.
Optionally, the setting value is 1600.
The denoising device of image provided in an embodiment of the present invention of taking pictures can perform taking pictures for any embodiment offer of the present invention
The noise-reduction method of image, possesses the corresponding function module of execution method and beneficial effect.
In addition, the present embodiment also provides a kind of mobile terminal, including the noise reduction dress of image of taking pictures that the present embodiment is provided
Put, described device can perform the noise-reduction method for the image of taking pictures that any embodiment of the present invention provides, and it is corresponding to possess execution method
Function module and beneficial effect.
The technical principle that above are only presently preferred embodiments of the present invention and used.The invention is not restricted to spy described here
Determine embodiment, the various significant changes that can carry out for a person skilled in the art, readjust and substitute all without departing from
Protection scope of the present invention.Therefore, although being described in further detail by above example to the present invention, this hair
It is bright to be not limited only to above example, without departing from the inventive concept, other more equivalence enforcements can also be included
Example, and the scope of the present invention is determined by the scope of claim.
Claims (8)
- A kind of 1. noise-reduction method for image of taking pictures, it is characterised in that including：When current sensitivity value is less than setting value, corresponding noise reduction coefficient is determined according to current sensitivity value；When current sensitivity value is greater than or equal to setting value, it is preset value to determine noise reduction coefficient；Noise reduction is carried out to image of taking pictures according to the noise reduction coefficient, and increases the contrast for image of taking pictures；The image of taking pictures after output noise reduction.
- 2. according to the method described in claim 1, it is characterized in that, the current sensitivity value of the basis determines corresponding noise reduction system Number includes：According to current sensitivity value, based on following noise reduction function, corresponding noise reduction coefficient is determined：N=ISO/k,Wherein, N is noise reduction coefficient, and ISO is sensitivity value, and k is setup parameter.
- 3. according to the method described in claim 1, it is characterized in that, described drop image of taking pictures according to the noise reduction coefficient Make an uproar including：Noise reduction is carried out to image of taking pictures using image-signal processor according to the noise reduction coefficient.
- 4. according to the method described in claim 1, it is characterized in that, the setting value is 1600.
- A kind of 5. denoising device for image of taking pictures, it is characterised in that including：Noise reduction coefficient determination unit, for when current sensitivity value is less than setting value, determining to correspond to according to current sensitivity value Noise reduction coefficient；When current sensitivity value is greater than or equal to setting value, it is preset value to determine noise reduction coefficient；Noise reduction unit, for carrying out noise reduction to image of taking pictures according to the noise reduction coefficient；Take pictures image output unit, for image of taking pictures described in exporting after noise reduction.
- 6. device according to claim 5, it is characterised in that the noise reduction coefficient determination unit is specifically used for：According to current sensitivity value, based on following noise reduction function, corresponding noise reduction coefficient is determined：N=ISO/k,Wherein, N is noise reduction coefficient, and ISO is sensitivity value, and k is setup parameter.
- 7. device according to claim 5, it is characterised in that the noise reduction unit is specifically used for：Noise reduction is carried out to image of taking pictures using image-signal processor according to the noise reduction coefficient.
- 8. device according to claim 5, it is characterised in that the setting value is 1600.
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| CN109151257B (en) * | 2018-09-20 | 2020-12-08 | 浙江大华技术股份有限公司 | Image processing method and camera |
| CN109089046B (en) * | 2018-09-25 | 2021-06-04 | Oppo广东移动通信有限公司 | Image noise reduction method and device, computer readable storage medium and electronic equipment |
| CN109727211A (en) * | 2018-12-21 | 2019-05-07 | 厦门美图之家科技有限公司 | A kind of image de-noising method, calculates equipment and medium at device |
| CN110191291B (en) * | 2019-06-13 | 2021-06-25 | Oppo广东移动通信有限公司 | Image processing method and device based on multi-frame images |
| CN111147695B (en) * | 2019-12-31 | 2022-05-13 | Oppo广东移动通信有限公司 | Image processing method, image processor, shooting device and electronic equipment |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |