CN104469191A - Image denoising method and device - Google Patents
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- CN104469191A CN104469191A CN201410729158.2A CN201410729158A CN104469191A CN 104469191 A CN104469191 A CN 104469191A CN 201410729158 A CN201410729158 A CN 201410729158A CN 104469191 A CN104469191 A CN 104469191A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
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Abstract
The invention belongs to the technical field of communications, and provides an image denoising method and device. The method comprises the steps of shooting, wherein a plurality of cameras are used for shooting the same photographic field, and a plurality of first RAW images are obtained; denoising, wherein the pixel points in the first RAW images at the same shooting position are compared, standard pixel points in the pixel points at the same shooting position are kept, the pixel points except the standard pixel points are removed, and a plurality of second RAW images are obtained; recombination, wherein the second RAW images are combined to form a third RAW image. Therefore, the image denoising processing effect is improved.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and device thereof of image noise reduction.
Background technology
In existing Image Denoising, normally by the value of any in digital picture or Serial No. is replaced it by the intermediate value of each point value in a field of this point, major function allows the larger pixel of the difference of surrounding pixel gray value change to take the value close with the pixel value of surrounding, thus can eliminate isolated noise spot.But the image that such processing mode is many to some details, uses median filtering method to reduce image sharpness, makes image thicken; The method of medium filtering particularly should not be adopted in the image that point, line, pinnacle details are more.
Therefore, adopt median filtering method to carry out denoising to image, can remove isolated noise, but because the color that around its balance, gray value is close, also can make soft edge simultaneously, image sharpness declines, and Consumer's Experience reduces.
In addition on the one hand, the source of thermal noise is particularly because CCD (Charge-coupled Device, middle charge coupled cell) and CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductors (CMOS)) photo-sensitive cell all has the problem of thermal stability (hot pixel), then with relevant with temperature to the quality of imaging, and no matter be CCD or CMOS chip, operationally all inevitably can produce high temperature.Temperature as fruit chip raises, and noise signal is excessively strong, and on picture, can form variegated spot in not due place, these points are exactly described noise.And the generation of thermal noise is because thermocurrent is superimposed upon on normal signal electric current, so cause the signal code of partial pixel point to be greater than normal induction electric current, finally cause the signal strength signal intensity on this pixel stronger, show on RAW figure to be exactly that brightness is higher.This type of pixel after rear end ISP adds colors countenance, the noise problem such as color will be caused darker or brighter.At present for the denoising not good processing mode of these noises.
In summary, obviously there is inconvenience and defect in actual use in conventional images noise-removed technology, so be necessary to be improved.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of method and device thereof of image noise reduction, to improve the effect of image noise reduction process.
To achieve these goals, the invention provides a kind of method of image noise reduction, comprising:
Shooting step, adopts multiple camera to take same scenery, obtains multiple first RAW image;
Noise reduction step, the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments in the pixel of multiple described same camera site is retained, and the pixel not belonging to described official portrait vegetarian refreshments is removed, obtain multiple second RAW image;
Reconstitution steps, is combined into the 3rd RAW image by multiple described second RAW image.
According to described method, described noise reduction step comprises:
The pixel of the same camera site in multiple first RAW image is contrasted;
When the luminance difference of the pixel in multiple described same camera site is more than noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments; Or
When the luminance difference of the pixel in multiple described same camera site is below noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the brightest as official portrait vegetarian refreshments;
Retain in each first RAW image with the official portrait vegetarian refreshments in all pixels of described same camera site, and other pixels in all pixels of described same camera site are deleted, obtain described second RAW image.
According to described method, described method also comprises:
Check and correction step, contrasts multiple described first RAW image, searches the pixel of each described same camera site in each described first RAW image.
According to described method, described method also comprises:
Picture signal treatment step, carries out output image after picture signal process by described 3rd RAW image.
Method according to above-mentioned any one, the number of described camera is two; The number of described first RAW image is two.
In order to realize another goal of the invention of the present invention, present invention also offers a kind of device of image noise reduction, comprising:
Taking module, for adopting multiple camera to take same scenery, obtains multiple first RAW image;
Noise reduction module, for the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments in the pixel of multiple described same camera site is retained, and the pixel not belonging to described official portrait vegetarian refreshments is removed, obtain multiple second RAW image;
Recombination module, for being combined into the 3rd RAW image by multiple described second RAW image.
According to described device, described noise reduction module comprises:
Contrast submodule, for contrasting the pixel of the same camera site in multiple first RAW image;
Chooser module, for when the luminance difference of the pixel in multiple described same camera site is more than noise scope, selects pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments; Or
For when the luminance difference of the pixel in multiple described same camera site is below noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the brightest as official portrait vegetarian refreshments;
Delete submodule, for retaining with the official portrait vegetarian refreshments in all pixels of described same camera site in each first RAW image, and the pixel not belonging to described official portrait vegetarian refreshments in all pixels of described same camera site is deleted, obtain described second RAW image.
According to described device, described device also comprises:
Checking module, for multiple described first RAW image being contrasted, searches the pixel of each described same camera site in each described first RAW image.
According to described device, described device also comprises:
Image signal processing blocks, for carrying out output image after picture signal process by described 3rd RAW image.
Device according to above-mentioned any one, the number of described camera is two; The number of described first RAW image is two.
The present invention takes same scenery by adopting multiple camera, obtains multiple first RAW image; Then the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments is wherein retained, and other pixels not belonging to described official portrait vegetarian refreshments are removed, be combined into the 3rd RAW image after obtaining multiple second RAW image.Thus, make use of the most original image luminance information and carry out contrast noise reduction, realize the good result of final output image.Thus, the denoising effect of image can be improved, the noise problem of taking pictures under particularly can significantly reducing dark situation, thus promote image analysis power, make the image of shooting more clear, the details of more scenery can be shot, thus lifting Consumer's Experience, increase the occupation rate of market of product.
Accompanying drawing explanation
Fig. 1 is the device composition schematic diagram of the image noise reduction that first embodiment of the invention provides;
Fig. 2 be the present invention second and third, the device composition schematic diagram of the image noise reduction that provides of four embodiments;
Fig. 3 is the method flow diagram of the image noise reduction that fifth embodiment of the invention provides;
Fig. 4 is the method flow diagram of the image noise reduction that one embodiment of the present of invention provide.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
See Fig. 1, in the first embodiment of the present invention, provide a kind of device 100 of image noise reduction, comprising:
Taking module 10, for adopting multiple camera to take same scenery, obtains multiple first RAW image;
Noise reduction module 20, for the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments in the pixel of multiple described same camera site is retained, and the pixel not belonging to described official portrait vegetarian refreshments is removed, obtain multiple second RAW image;
Recombination module 30, for being combined into the 3rd RAW image by multiple described second RAW image.
In this embodiment, by utilizing multiple camera to take same scenery, multiple first RAW image is obtained; Then by noise reduction module 20, noise reduction process is carried out to this multiple first RAW image.Concrete, the pixel of the same camera site in multiple described first RAW image contrasts by noise reduction module 20, then according to comparing result, choice criteria pixel in the pixel of multiple described same camera site is retained, the reservation of these official portrait vegetarian refreshments and the deletion of other pixels, will make multiple described first RAW image meet noise reduction requirement.And described noise reduction requires to refer to that multiple described first RAW image reaches image denoising requirement, noise quantity in image and/or noise value are in rational interval, and this noise reduction requires to carry out experience setting by those skilled in the art according to the characteristic etc. of shooting environmental or photographed and filming apparatus.Each first RAW image carry out corresponding pixel reservation or after removing, obtain the second corresponding RAW image.Finally, by recombination module 30, multiple described second RAW image is combined into the 3rd RAW image, the 3rd RAW image of again synthesizing.Thus, the mode that the present embodiment utilizes multiple camera to work in coordination, can removal of images noise, image sharpness can be kept again not to be lowered, significantly improve picture quality, thus user satisfaction is promoted.
See Fig. 2, in the second embodiment of the present invention, noise reduction module 20 comprises:
Contrast submodule 21, for contrasting the pixel of the same camera site in multiple first RAW image;
Chooser module 22, for when the luminance difference of the pixel in multiple described same camera site is more than noise scope, selects pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments; Or
For when the luminance difference of the pixel in multiple described same camera site is below noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the brightest as official portrait vegetarian refreshments;
Delete submodule 23, for retaining with the official portrait vegetarian refreshments in all pixels of described same camera site in each first RAW image, and the pixel other in all pixels of described same camera site not being belonged to described official portrait vegetarian refreshments is deleted, and obtains described second RAW image.
In this embodiment, noise scope can be preset before taking pictures, according to the noise scope that different photo environments, photograph subject and the featured configuration of device of taking pictures are applicable to.Those skilled in the art can be arranged according to its experience.The pixel of the same camera site in multiple first RAW image contrasts by contrast submodule 21; And the luminance difference of pixel in multiple described same camera site more than noise scope time, the brightness of this pixels illustrated point is abnormal high, and therefore chooser module 22 will select pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments.And the luminance difference of pixel in multiple described same camera site below noise scope time, the brightness of this pixels illustrated point is on the low side, therefore chooser module 22 using the brightest pixel of brightness in the pixel selecting multiple described same camera site as official portrait vegetarian refreshments.Delete submodule 23 the official portrait vegetarian refreshments on described same camera site is retained, and delete this other pixels of same camera site, obtain the second RAW image thus.
In a preferred embodiment of the invention, the number of multiple described camera is two; The number of described first RAW image is two, concrete, and noise reduction module 20 contrasts submodule 21 and contrasted by the pixel of the same camera site in two the first RAW image when carrying out noise reduction process; Chooser module 22, when the luminance difference of the pixel of two described same camera sites is more than noise scope, selects pixel that in the pixel of two described same camera sites, brightness is the darkest as official portrait vegetarian refreshments; Or, when the luminance difference of the pixel two described same camera sites is below noise scope, select pixel that in the pixel of two described same camera sites, brightness is the brightest as official portrait vegetarian refreshments; Delete submodule 23 retains with the official portrait vegetarian refreshments in all pixels of described same camera site in each first RAW image, and the pixel other in all pixels of described same camera site not being belonged to described official portrait vegetarian refreshments is deleted, and obtains described second RAW image.Namely the second RAW image after two noise reduction process can be obtained.Finally, in this embodiment, after two width image comparison, remove the pixel of brightness exception, retain the pixel of normal brightness, and the result after two the 2nd RAW figure contrasts is reconfigured, form the RAW figure that a width is new, the 3rd new RAW figure has eliminated the noise of thermal noise generation by contrast, be the image meeting noise reduction requirement.Certainly in other implementations, the number of multiple described camera can also be three, four etc.; And the number of described first RAW image is three, four etc. accordingly.Can arrange the requirement etc. of image of taking pictures according to user.
See Fig. 2, in the third embodiment of the present invention, the device 100 of image noise reduction also comprises:
Checking module 40, for multiple described first RAW image being contrasted, searches the pixel of each described same camera site in each described first RAW image.
In this embodiment, at contrast submodule 21, before the pixel of the same camera site in multiple first RAW image is contrasted, need by checking module 40, multiple described first RAW image to be contrasted, search the pixel of each described same camera site in each described first RAW image.This is the same scenery owing to being taken by multiple camera, the position of the pixel of each part concrete in this scenery possible in each described first RAW image is different, so proofreaded by the pixel of checking module 40 by part each in this scenery.Such as, the coordinate position of the pixel in the first RAW image of the shooting at a camera of a petal in scenery is (630,630); And the coordinate position of pixel in the first RAW image of the shooting of another one camera is (640,640); Checking module 40 is proofreaded.The figure shown in multiple described first RAW image, color and brightness contrast by checking module 40, search the pixel on the described same camera site in each described first RAW image.Namely concrete checking module 40 can belong to the same structure of shooting by which structures be informed in different images such as the figure in image, color and brightness.
See Fig. 2, in the fourth embodiment of the present invention, the device 100 of image noise reduction also comprises:
Image signal processing blocks 50, for carrying out output image after picture signal process by described 3rd RAW image.
In this embodiment, image signal processing blocks 50 carries out picture signal process to described 3rd RAW image, and the form of the image exported in described image signal processing blocks 50 is RAW form or jpeg format.
In above-mentioned multiple embodiment, the device 100 of described image noise reduction can be applicable to mobile phone, PDA (Personal Digital Assistant, personal digital assistant), in the mobile terminal such as panel computer, and multiple modules of the device 100 of this image noise reduction can be the software units being built in mobile terminal, hardware cell or software and hardware combining unit.
See Fig. 3, in the fifth embodiment of the present invention, provide a kind of method of image noise reduction, comprising:
In step S301, adopt multiple camera to take same scenery, obtain multiple first RAW image; This step is shooting step, is realized by taking module 10;
In step S302, the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments in the pixel of multiple described same camera site is retained, and the pixel not belonging to described official portrait vegetarian refreshments is removed, obtain multiple second RAW image; This step is noise reduction step, is realized by noise reduction module 20;
In step S303, multiple described second RAW image is combined into the 3rd RAW image.This step is reconstitution steps, is realized by recombination module 30.
In this embodiment, by multiple camera, same scenery is taken, due to the difference of the angle of shooting or the parameter of distance and camera etc., by multiple the first different RAW image of acquisition.After obtaining multiple the first different RAW image, multiple first RAW image is carried out complementation, pixel by the same camera site in multiple described first RAW image contrasts, official portrait vegetarian refreshments in the pixel of multiple described same camera site is retained, and the pixel not belonging to described official portrait vegetarian refreshments is removed, obtain multiple second RAW image; Finally multiple described second RAW image is combined into the 3rd RAW image.Wherein, official portrait vegetarian refreshments sets according to the scenery of concrete shooting environmental, shooting or device, and it meets the noise reduction requirement of image.In addition, these cameras comprise CCD or CMOS sensitive component.
In the sixth embodiment of the present invention, described noise reduction step comprises:
The pixel of the same camera site in multiple first RAW image is contrasted; This step realizes by contrasting submodule 21;
When the luminance difference of the pixel in multiple described same camera site is more than noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments; This step is realized by chooser module 22; Or
When the luminance difference of the pixel in multiple described same camera site is below noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the brightest as official portrait vegetarian refreshments; This step is realized by chooser module 22;
Retain in each first RAW image with the official portrait vegetarian refreshments in all pixels of described same camera site, and other pixels in all pixels of described same camera site are deleted, obtain described two RAW image.This step realizes by deleting submodule 23.
In this embodiment, need to select in each first RAW image the pixel meeting denoising requirement---official portrait vegetarian refreshments, and retained, the pixel not meeting denoising requirement is then removed.Official portrait vegetarian refreshments is within the scope of noise.And this noise scope can be preset before taking pictures, such as, arrange according to the characteristic of different photo environments, photograph subject and camera arrangement, to arrange applicable noise scope; And those skilled in the art can be arranged according to its experience.Concrete chooser module 22, when the luminance difference of the pixel of multiple described same camera site is more than noise scope, selects pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments; Otherwise, then select pixel that in the pixel of multiple described same camera site, brightness is the brightest as official portrait vegetarian refreshments; Finally, delete submodule 23 other pixels not belonging to official portrait vegetarian refreshments are removed.The number of preferred described camera is two; The number of described first RAW image is two.Certainly, can also be the camera of other numbers, such as, 3 or 4 are set.
In the seventh embodiment of the present invention, described method also comprises:
Multiple described first RAW image is contrasted, searches the pixel of each described same camera site in each described first RAW image; This step is check and correction step, is realized by checking module 40; In this check and correction step, by the figure shown in multiple described first RAW image, color and brightness being contrasted, the pixel on the described same camera site in each described first RAW image can be searched.
In another inventive embodiments of the present invention, described method also comprises: described 3rd RAW image is carried out output image after picture signal process.This step is picture signal treatment step, is realized by image signal processing blocks 50.The form of the image exported in described picture signal treatment step is RAW form or jpeg format.User can select to use voluntarily.
In this embodiment, need multiple described first RAW image to contrast, search the pixel of each described same camera site in each described first RAW image; Namely in the first different RAW image, find the pixel of each position of scenery in each first RAW image, then, denoising module 20 can contrast according to the pixel of result to the same camera site in each first RAW image of contrast.Image signal processing blocks 50 processes the 3rd RAW image, and therefore, the form of the image exported in described picture signal treatment step is RAW form or jpeg format.
See Fig. 4, in one embodiment of the invention, provide a kind of method of image noise reduction, described method is described below:
In step S401, dual camera is taken pictures simultaneously and is exported RAW image;
In step S402, dedicated cpu contrasts two width RAW image, noise reduction, combination;
In step S403, output to ISP and carry out back-end processing;
In step S404, export RAW picture or JEPG picture.
In this embodiment, use dual camera to take same scenery simultaneously, and export RAW image simultaneously.Before ISP process, the two width RAW image to shooting first are needed to contrast.To contrast in the pixel picture of same camera site thus pixel all contrast, if luminance difference value is more than noise scope, then getting the darker pixel of brightness is official portrait vegetarian refreshments; If luminance difference value is below noise scope, then getting the brighter pixel of brightness is official portrait vegetarian refreshments, avoids integral image brightness to decline.After two width image comparison, remove the pixel of brightness exception, retain the pixel of normal brightness, then the result after two width RAW image contrasts is reconfigured, form the RAW image that a width is new.New RAW image is exactly that the light signal captured is converted into the initial data of digital signal by CMOS or ccd image inductor, is eliminated the image after the noise of thermal noise generation by contrast.Then, this new RAW image is outputted to rear end ISP, then through the process of ISP, increase setting during shooting, export accessible RAW and scheme, or increase color information again and compression is carried out to image and process, finally exportable width Jpeg picture clearly.Wherein, ISP (Image Signal Processor), i.e. image procossing, Main Function does post-processed to the signal that front-end image transducer exports, the linear correction of major function, noise remove, bad point removal, interpolation, white balance, auto-exposure control etc., depend on ISP and could can reduce on-the-spot details preferably under different optical conditions, ISP technology determines the image quality of camera to a great extent.On the other hand, the present embodiment needs to increase before ISP process the processor unit that picture contrast processes, and namely its realization is the function of checking module 40.
In sum, the present invention takes same scenery by adopting multiple camera, obtains multiple first RAW image; Then the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments is wherein retained, and other pixels not belonging to described official portrait vegetarian refreshments are removed, be combined into the 3rd RAW image after obtaining multiple second RAW image.Thus, make use of the most original image luminance information and carry out contrast noise reduction, realize the good result of final output image.Thus, the denoising effect of image can be improved, the noise problem of taking pictures under particularly can significantly reducing dark situation, thus promote image analysis power, make the image of shooting more clear, the details of more scenery can be shot, thus lifting Consumer's Experience, increase the occupation rate of market of product.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (10)
1. a method for image noise reduction, is characterized in that, comprising:
Shooting step, adopts multiple camera to take same scenery, obtains multiple first RAW image;
Noise reduction step, the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments in the pixel of multiple described same camera site is retained, and the pixel not belonging to described official portrait vegetarian refreshments is removed, obtain multiple second RAW image;
Reconstitution steps, is combined into the 3rd RAW image by multiple described second RAW image.
2. method according to claim 1, is characterized in that, described noise reduction step comprises:
The pixel of the same camera site in multiple first RAW image is contrasted;
When the luminance difference of the pixel in multiple described same camera site is more than noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments; Or
When the luminance difference of the pixel in multiple described same camera site is below noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the brightest as official portrait vegetarian refreshments;
In each first RAW image, retain the official portrait vegetarian refreshments in all pixels of described same camera site, and the pixel not belonging to described official portrait vegetarian refreshments in all pixels of described same camera site is deleted, obtain described second RAW image.
3. method according to claim 1, is characterized in that, described method also comprises:
Check and correction step, contrasts multiple described first RAW image, searches the pixel of each described same camera site in each described first RAW image.
4. method according to claim 1, is characterized in that, described method also comprises:
Picture signal treatment step, carries out output image after picture signal process by described 3rd RAW image.
5. method according to claims 1 to 4, is characterized in that, the number of described camera is two; The number of described first RAW image is two.
6. a device for image noise reduction, is characterized in that, comprising:
Taking module, for adopting multiple camera to take same scenery, obtains multiple first RAW image;
Noise reduction module, for the pixel of the same camera site in multiple described first RAW image is contrasted, official portrait vegetarian refreshments in the pixel of multiple described same camera site is retained, and the pixel not belonging to described official portrait vegetarian refreshments is removed, obtain multiple second RAW image;
Recombination module, for being combined into the 3rd RAW image by multiple described second RAW image.
7. device according to claim 6, is characterized in that, described noise reduction module comprises:
Contrast submodule, for contrasting the pixel of the same camera site in multiple first RAW image;
Chooser module, for when the luminance difference of the pixel in multiple described same camera site is more than noise scope, selects pixel that in the pixel of multiple described same camera site, brightness is the darkest as official portrait vegetarian refreshments; Or
For when the luminance difference of the pixel in multiple described same camera site is below noise scope, select pixel that in the pixel of multiple described same camera site, brightness is the brightest as official portrait vegetarian refreshments;
Delete submodule, for retaining with the official portrait vegetarian refreshments in all pixels of described same camera site in each first RAW image, and the pixel not belonging to described official portrait vegetarian refreshments in all pixels of described same camera site is deleted, obtain described second RAW image.
8. device according to claim 6, is characterized in that, described device also comprises:
Checking module, for multiple described first RAW image being contrasted, searches the pixel of each described same camera site in each described first RAW image.
9. device according to claim 8, is characterized in that, described device also comprises:
Image signal processing blocks, for carrying out output image after picture signal process by described 3rd RAW image.
10. according to the device described in claim 6 ~ 9, it is characterized in that, the number of described camera is two; The number of described first RAW image is two.
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| CN201410729158.2A CN104469191B (en) | 2014-12-03 | 2014-12-03 | The method and its device of image noise reduction |
| PCT/CN2014/096001 WO2016086489A1 (en) | 2014-12-03 | 2014-12-31 | Image noise reduction method and device thereof |
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