CN105578068B - A kind of generation method of high dynamic range images, device and mobile terminal - Google Patents
A kind of generation method of high dynamic range images, device and mobile terminal Download PDFInfo
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- CN105578068B CN105578068B CN201510973323.3A CN201510973323A CN105578068B CN 105578068 B CN105578068 B CN 105578068B CN 201510973323 A CN201510973323 A CN 201510973323A CN 105578068 B CN105578068 B CN 105578068B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
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Abstract
The embodiment of the invention discloses a kind of generation method of high dynamic range images, device and mobile terminals.This method includes：Calculate the luminance weighted average value of current cache image, wherein brightness value is higher than the weight in other regions higher than the weight in the region of the first luminance threshold；Image is captured to control camera according to the exposure parameter determined by luminance weighted average value, as pending image；The brightness that brightness value in pending image is less than the region of the second luminance threshold is promoted, and generates HDR image.The embodiment of the present invention can effectively improve the dynamic range of HDR image, and this method need not shoot multiple pictures to synthesize HDR image by using above-mentioned technical proposal, can promote processing speed, realize snapshots.
Description
Technical field
The present embodiments relate to technical field of image processing more particularly to a kind of generation sides of high dynamic range images
Method, device and mobile terminal.
Background technology
High dynamic range (High Dynamic Range, HDR) image is compared with normal image, it is possible to provide more dynamics
Range and image detail can preferably reflect the visual effect in people's true environment.
Currently, the mobile terminals such as many digital cameras and the mobile phone configured with camera all support HDR exposal models, it should
Pattern is particularly suitable for taking pictures in the shooting environmental of backlight.Current environment be backlight state when, common exposal model due to
Dynamic range is insufficient, and captured photo often will appear bright place's overexposure or the problem of dark place owes to expose, can using HDR exposal models
It is effectively improved the problem.
In existing HDR exposal models, it usually needs the photo for shooting the different depth of exposure of multiple Same Scenes, by this
A little photos are synthesized, and HDR image is generated.For example, three brightness of shooting are respectively brighter, intermediate light and dark photo,
When passing through software process quality, by corresponding part in the brighter photo of the insufficient parts of images of relative exposure in intermediate light photo
Image replaces, and the excessive parts of images of relative exposure is replaced with corresponding parts of images in dark photo, and final synthesis HDR schemes
Picture, the program need to shoot multiple different brightness photos, and speed is slower, cannot be satisfied user demand.
Invention content
The purpose of the embodiment of the present invention is to provide a kind of generation method of high dynamic range images, device and mobile terminal,
To solve the problems, such as that it is slow that existing high dynamic range images generate scheme processing speed.
In a first aspect, an embodiment of the present invention provides a kind of generation methods of high dynamic range images, including：
Calculate the luminance weighted average value of current cache image, wherein brightness value is higher than the region of the first luminance threshold
Weight is higher than the weight in other regions；
Image is captured to control camera according to the exposure parameter determined by the luminance weighted average value, as pending
Image；
The brightness that brightness value in the pending image is less than the region of the second luminance threshold is promoted, and generates HDR image.
Second aspect, an embodiment of the present invention provides a kind of generating means of high dynamic range images, including：
Luminance weighted mean value calculation module, the luminance weighted average value for calculating current cache image, wherein brightness
Value is higher than the weight in other regions higher than the weight in the region of the first luminance threshold；
Picture catching control module, for controlling camera shooting according to the exposure parameter determined by the luminance weighted average value
Head captures image, as pending image；
HDR image generation module is less than the region of the second luminance threshold for promoting brightness value in the pending image
Brightness, and generate HDR image.
The third aspect, the embodiment of the present invention additionally provide a kind of generating means being integrated with aforementioned high dynamic range images
Mobile terminal.
The generation scheme of the high dynamic range images provided in the embodiment of the present invention, the brightness for calculating current cache image add
Weight average value, and improve brightness value higher than the first luminance threshold region weight, compared to brightness is calculated in existing scheme
For average value, the image overall brightness value higher calculated, determining exposure parameter can guarantee according to this images in control
When head captures image, clear zone is not in over-exposed situation.It will be using the image that above-mentioned exposure parameter captures as pending
Image promotes the brightness that brightness value in pending image is less than the region of the second luminance threshold, and generates HDR image, can be effective
The dynamic range of HDR image is improved, and the program need not shoot multiple pictures to synthesize HDR image, can promote processing speed,
Realize snapshots.
Description of the drawings
Fig. 1 is a kind of flow diagram of the generation method for high dynamic range images that the embodiment of the present invention one provides；
Fig. 2 is a kind of flow diagram of the generation method of high dynamic range images provided by Embodiment 2 of the present invention；
Fig. 3 is a kind of flow signal of the generation method for preferred high dynamic range images that the embodiment of the present invention three provides
Figure；
Fig. 4 is a kind of structure diagram of the generating means for high dynamic range images that the embodiment of the present invention four provides.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.It is appreciated that
It is that specific embodiment described herein is used only for explaining the present invention rather than limitation of the invention.It further needs exist for illustrating
, only the parts related to the present invention are shown for ease of description, in attached drawing rather than entire infrastructure.
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The processing described as flow chart or method.Although each step is described as the processing of sequence, many of which by flow chart
Step can be implemented concurrently, concomitantly or simultaneously.In addition, the sequence of each step can be rearranged.When its operation
The processing can be terminated when completion, it is also possible to the additional step being not included in attached drawing.The processing can be with
Corresponding to method, function, regulation, subroutine, subprogram etc..
Embodiment one
Fig. 1 is a kind of flow diagram of the generation method for high dynamic range images that the embodiment of the present invention one provides, should
Method can be executed by the generating means of high dynamic range images, and wherein the device can generally may be used by software and or hardware realization
It integrates in the terminal.As shown in Figure 1, this method includes：
Step 101, the luminance weighted average value for calculating current cache image.
Wherein, brightness value is higher than the weight in other regions higher than the weight in the region of the first luminance threshold.
Illustratively, concretely mobile phone, tablet computer and digital camera etc. are whole for the mobile terminal in the present embodiment
End, preferably smart mobile phone.
Illustratively, current cache image can be divided into multiple regions, each region Ke Bao according to Luminance Distribution situation
Include one or more pixel.Illustratively, all pixels that the brightness value in a region includes concretely in the region
Average value.First luminance threshold can be arranged by system default, can be also configured according to personal habits by user.First is bright
It can be a fixed brightness value to spend threshold value, can also be the brightness value of a dynamic adjustment.For example, when the first luminance threshold
When being arranged to the brightness value of a dynamic adjustment, the preset ratio of the average brightness of current cache image can be set to
Value, such as 120%.
Illustratively, brightness value also can be by being higher than the weight in the region of the first luminance threshold and the weight in other regions
System default setting, or be configured according to personal habits by user.
Illustratively, global Exposure Metering can be used to obtain the photometric data of current cache image, it can in photometric data
Include the brightness value of each pixel.
Step 102 captures image according to the exposure parameter determined by luminance weighted average value to control camera, as waiting for
Handle image.
Illustratively, the exposure parameter may include the time for exposure.Usually with the average brightness of image in existing scheme
To weigh image overall brightness, and the time for exposure is determined according to average brightness.In the present embodiment, using institute in step 101
The luminance weighted average value calculated weighs image overall brightness, in calculating process, improves brightness value and is higher than first brightness
The weight in the region of threshold value, so the luminance weighted average value is higher than the average brightness in existing scheme, according to this determining exposure
It is shorter between light time, it is ensured that when controlling camera capture image according to the time for exposure, clear zone is not in over-exposed
Situation.
Step 103 promotes the brightness that brightness value in pending image is less than the region of the second luminance threshold, and generates HDR
Image.
Illustratively, due to shortening the time for exposure, the overall brightness of pending image can reduce, in order to ensure dark place
Details is not lost, this step is done brightness less than the region (dark place region) of the second luminance threshold to brightness value in pending image and carried
Processing is risen, to show the more details of dark place.Second luminance threshold can be arranged by system default, also can be by user according to a
People's custom is configured.Second luminance threshold can be a fixed brightness value, can also be the brightness of a dynamic adjustment
Value.
Illustratively, can calculate can adjust dark place region to the gamma of appropriate brightness (Gamma) parameter (such as Gamma
Curve), and pending image is adjusted according to Gamma parameters, ultimately produces that dynamic range is wider, image detail is more
HDR image.
The generation method for the high dynamic range images that the embodiment of the present invention one provides, the brightness for calculating current cache image add
Weight average value, and improve brightness value higher than the first luminance threshold region weight, compared to brightness is calculated in existing scheme
For average value, the image overall brightness value higher calculated, determining exposure parameter can guarantee according to this images in control
When head captures image, clear zone is not in over-exposed situation.It will be using the image that above-mentioned exposure parameter captures as pending
Image promotes the brightness that brightness value in pending image is less than the region of the second luminance threshold, and generates HDR image, can be effective
The dynamic range of HDR image is improved, and this method need not shoot multiple pictures to synthesize HDR image, can promote processing speed,
Realize snapshots.
Embodiment two
Fig. 2 is a kind of flow diagram of the generation method of high dynamic range images provided by Embodiment 2 of the present invention, this
Embodiment is optimized based on above-described embodiment, in the present embodiment, step " it is low to be promoted brightness value in pending image
Brightness in the region of the second luminance threshold, and generate HDR image " be optimized for：According to the luminance statistic data of pending image
Calculate gamma parameter；Pending image is adjusted according to gamma parameter, to promote in pending image brightness value less than the
The brightness in the region of two luminance thresholds, obtains sample image；HDR image is generated according to sample image.
Correspondingly, the method for the present embodiment includes the following steps：
Step 201, the luminance weighted average value for calculating current cache image.
Wherein, brightness value is higher than the weight in other regions higher than the weight in the region of the first luminance threshold.
Step 202 captures image according to the exposure parameter determined by luminance weighted average value to control camera, as waiting for
Handle image.
Step 203 calculates gamma parameter according to the luminance statistic data of pending image.
Illustratively, the luminance statistic data of pending image may include：The subregion average brightness of pending image
With the brightness histogram of pending image.For example, pending image averaging can be divided into N number of subregion, subregion i (1≤i≤
N average brightness) is the average value of the brightness for all pixels for including in subregion i.Brightness histogram, also known as color range are
Using brightness value as abscissa, using pixel quantity as the image of ordinate, graphically each of image is bright for brightness histogram
The quantity for spending the pixel of rank, presents the distribution situation of pixel in the picture.
Illustratively, Gamma parameters may include gamma curve or Gamma values.Gamma curve is a kind of special tone
Curve, when Gamma values are equal to 1, curve is the straight line at 45 ° with reference axis, indicates this when to output and input close
It spends identical.Gamma values higher than 1 will cause output to darken, and the Gamma values less than 1 will cause output brightening.In existing side
In case, Gamma parameters are usually the fixed value pre-set, or are directly chosen accordingly according to different exposal models
Gamma parameters；And in the present embodiment, Gamma parameters are recalculated according to the luminance statistic data of pending image, in order to
Subsequently pending image is adjusted.
Step 204 is adjusted pending image according to gamma parameter, is less than with promoting brightness value in pending image
The brightness in the region of the second luminance threshold, obtains sample image.
Illustratively, it after being adjusted to pending image according to the Gamma parameters calculated in step 203, can carry
Rise the brightness in dark place region in pending image.
Step 205 generates HDR image according to sample image.
The generation method of high dynamic range images provided by Embodiment 2 of the present invention, according to the brightness statistics of pending image
Data calculate Gamma parameters, and are adjusted to pending image according to Gamma parameters, to promote dark place in pending image
The brightness in region, ultimately generates HDR image, can further promote the picture quality of HDR image, it is thin to show more images
Section, meets user demand.In addition, be adjusted to pending image based on luminance statistic data, very to the consumption of processor
It is few, so as to reduce the utilization rate of processor, advanced optimize user experience.
On the basis of the above embodiments, step " according to sample image generate HDR image " can advanced optimize for：To sample
This image carries out noise reduction process, and generates HDR image.This have the advantage that according to Gamma parameters to pending image into
When row adjustment, noise may be introduced, in order to further enhance photographic quality, noise reduction process can be first carried out to sample image, then
Generate HDR image.
Further, noise reduction process is carried out to sample image using wavelet de-noising algorithm and/or multiframe noise reduction algorithm, and
Generate HDR image.It is described that noise reduction process is carried out to sample image using multiframe noise reduction algorithm, specifically it may include：Obtain current sample
Multiple other sample images before or after this image close current sample image and multiple described other sample images
At noise reduction process.
Preferably, after wavelet de-noising algorithm progress noise reduction process can be utilized respectively to multiple sample images, multiframe is recycled
Noise reduction algorithm carries out noise reduction process, ultimately generates HDR image, can further promote noise reduction.
Embodiment three
Fig. 3 is a kind of flow signal of the generation method for preferred high dynamic range images that the embodiment of the present invention three provides
Figure, this method are particularly suitable for 0 second delay (Zero Second Delay, ZSD；Also known as Zero Second Later, ZSL) it claps
According to pattern.As shown in figure 3, this method comprises the following steps：
Step 301, the luminance weighted average value for calculating current cache image.
Wherein, brightness value is higher than the weight in other regions higher than the weight in the region of the first luminance threshold.
Illustratively, ZSD exposal models can be regarded as clapping i.e. gained, and user presses the photo that camera button photographed that time
It is exactly photo of the user seen in preview interface, it is for general mode is taken pictures.It claps in the normal mode
According to pressing and need after camera button to carry out to handle and correct in a series, such as focusing, adjusts white balance operation at adjustment exposure, so
It carries out coding again afterwards and generates photo.For example, in the case of 30 transmission frame per second of preview (Frames Per Second fps),
User is in the 1st frame when pressing camera button, and the photo actually taken may be the image of the 8th frame.And under ZSD patterns,
Several frame images can be cached, are pressed camera button that time in user, caching frame is directly extracted and is encoded and generate photo.Example
Such as, in the case of preview 30fps, user is in the 1st frame when pressing camera button, then the photo actually taken is also the 1st frame
Image.
Illustratively, this step can be controlled (Automatic Exposure Control, AEC) calculation by auto exposure parameter
Method is completed, and global Exposure Metering specifically can be used and obtain photometric data, and the brightness is calculated according to photometric data adds
Weight average value.
Step 302 captures image according to the exposure parameter determined by luminance weighted average value to control camera, as waiting for
Handle image.
Step 303 calculates gamma parameter according to the luminance statistic data of pending image.
It illustratively, can be by Gamma adjustment algorithms according to the subregion average brightness and brightness histogram of pending image
Figure calculates the Gamma parameters for promoting dark place regional luminance in pending image.
Step 304 is adjusted pending image according to gamma parameter, is less than with promoting brightness value in pending image
The brightness in the region of the second luminance threshold, obtains sample image.
Step 305, control preview interface real-time display sample image.
Illustratively, Gamma parameter read-ins image-signal processor (the Image Signal that can will be calculated
Processor, ISP), and preview interface real-time display sample image is controlled by ISP, it allows users to see tool in preview interface
The image for having HDR effects facilitates user to capture the picture oneself liked.
Step 306 judges whether to receive photographing instruction, if so, thening follow the steps 307；Otherwise, step is continued to execute
306。
Illustratively, when user presses camera button (or shutter key), it can receive photographing instruction.
Step 307 obtains the current sample image that preview interface is shown.
Step 308 carries out noise reduction process to current sample image, and generates HDR image.
Further, noise reduction process is carried out to sample image using wavelet de-noising algorithm and/or multiframe noise reduction algorithm, and
Generate HDR image.
The generation method for the high dynamic range images that the embodiment of the present invention three provides, can have in preview interface real-time display
The sample image of standby HDR effects, is applicable to ZSD exposal models, when user sees the sample graph oneself being satisfied in preview interface
When picture, camera button is pressed, mobile terminal will obtain current sample image, and carry out noise reduction process to current sample image, raw
At HDR image.This method is combined with ZSD exposal models, is allowed user easily to realize and is shone by observing preview interface to shoot HDR
Piece can further promote user and shoot experience.
Example IV
Fig. 4 is a kind of structure diagram of the generating means for high dynamic range images that the embodiment of the present invention four provides, the dress
It sets and can be typically integrated in mobile device by software and or hardware realization, the generation side of execution high dynamic range images can be passed through
Method shoots HDR photos to realize.As shown in figure 4, the device includes：Luminance weighted mean value calculation module 401, picture catching control
Molding block 402 and HDR image generation module 403.
Wherein, luminance weighted mean value calculation module 401, the luminance weighted average value for calculating current cache image,
Wherein, brightness value is higher than the weight in other regions higher than the weight in the region of the first luminance threshold；Picture catching control module
402, for capturing image according to the exposure parameter determined by the luminance weighted average value to control camera, as pending
Image；HDR image generation module 403 is less than the region of the second luminance threshold for promoting brightness value in the pending image
Brightness, and generate HDR image.
The generating means for the high dynamic range images that the embodiment of the present invention four provides, by luminance weighted mean value calculation module
401 calculate the luminance weighted average value of current cache image, and improve power of the brightness value higher than the region of the first luminance threshold
Weight is calculated compared to existing scheme for average brightness, the image overall brightness value higher calculated, picture catching
The exposure parameter that control module 402 determines according to this can guarantee that clear zone is not in exposed when controlling camera capture image
The case where spending is waited for using the image that above-mentioned exposure parameter captures as pending image by the promotion of HDR image generation module 403
The brightness that brightness value in image is less than the region of the second luminance threshold is handled, and generates HDR image, HDR image can be effectively improved
Dynamic range, and this method need not shoot multiple pictures to synthesize HDR image, can promote processing speed, realize and quickly clap
According to.
On the basis of the above embodiments, the HDR image generation module includes gamma parameter calculation unit, pending figure
As adjustment unit and HDR image generation unit.Wherein, gamma parameter calculation unit, for according to the bright of the pending image
It spends statistical data and calculates gamma parameter；Pending image control unit is used for according to the gamma parameter to the pending figure
As being adjusted, sample is obtained less than the brightness in the region of the second luminance threshold to promote brightness value in the pending image
Image；HDR image generation unit, for generating HDR image according to the sample image.
On the basis of the above embodiments, the HDR image generation unit is specifically used for：The sample image is dropped
It makes an uproar processing, and generates HDR image.
On the basis of the above embodiments, the HDR image generation unit is specifically used for：Using wavelet de-noising algorithm and/
Or multiframe noise reduction algorithm carries out noise reduction process to the sample image, and generate HDR image.
On the basis of the above embodiments, the HDR image generation unit includes preview interface control subelement, current sample
This image obtains subelement and HDR image generates subelement.Wherein, preview interface controls subelement, for controlling preview interface
Real-time display sample image；Current sample image obtains subelement, for when receiving photographing instruction, obtaining preview circle
The current sample image that face is shown；HDR image generates subelement, for generating HDR image according to the current sample image.
On the basis of the above embodiments, the luminance statistic data of the pending image includes：The pending image
Subregion average brightness and the pending image brightness histogram.
Embodiment five
The embodiment of the present invention five provides a kind of mobile terminal, and it is dynamic which is integrated with the height in the embodiment of the present invention
The generating means of state range image can realize shooting HDR photos by executing the generation method of high dynamic range images.
Illustratively, concretely mobile phone, tablet computer and digital camera etc. are whole for the mobile terminal in the present embodiment
End, preferably smart mobile phone.
When user shoots HDR photos using the mobile terminal in the present embodiment, captured HDR photos have higher
Dynamic range, and speed of taking pictures is fast, can promote user and shoot experience.
The executable present invention of the generating means and mobile terminal of the high dynamic range images provided in above-described embodiment is arbitrary
The generation method for the high dynamic range images that embodiment is provided has and executes the corresponding function module of this method and beneficial to effect
Fruit.The not technical detail of detailed description in the above-described embodiments, reference can be made to the high dynamic range that any embodiment of the present invention is provided
Enclose the generation method of image.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (13)
1. a kind of generation method of high dynamic range HDR image, which is characterized in that including：
Calculate the luminance weighted average value of current cache image, wherein weight of the brightness value higher than the region of the first luminance threshold
Higher than the weight in other regions；Wherein, the current cache image is divided into multiple regions according to Luminance Distribution situation, each
Region includes one or more pixel；
Image is captured to control camera according to the exposure parameter determined by the luminance weighted average value, as pending figure
Picture；
The brightness that brightness value in the pending image is less than the region of the second luminance threshold is promoted, and generates HDR image.
2. according to the method described in claim 1, it is characterized in that, brightness value is bright less than second in the promotion pending image
The brightness in the region of threshold value is spent, and generates HDR image, including：
Gamma parameter is calculated according to the luminance statistic data of the pending image；
The pending image is adjusted according to the gamma parameter, is less than with promoting brightness value in the pending image
The brightness in the region of the second luminance threshold, obtains sample image；
HDR image is generated according to the sample image.
3. according to the method described in claim 2, it is characterized in that, according to the sample image generate HDR image, including：
Noise reduction process is carried out to the sample image, and generates HDR image.
4. according to the method described in claim 3, it is characterized in that, carry out noise reduction process to the sample image, and HDR is generated
Image, including：
Noise reduction process is carried out to the sample image using wavelet de-noising algorithm and/or multiframe noise reduction algorithm, and generates HDR figures
Picture.
5. according to the method described in claim 2, it is characterized in that, according to the sample image generate HDR image, including：
Control preview interface real-time display sample image；
When receiving photographing instruction, the current sample image that the preview interface is shown is obtained；
HDR image is generated according to the current sample image.
6. according to the method described in claim 2, it is characterized in that, the luminance statistic data of the pending image includes：Institute
State the brightness histogram of the subregion average brightness and the pending image of pending image.
7. a kind of generating means of high dynamic range HDR image, which is characterized in that including：
Luminance weighted mean value calculation module, the luminance weighted average value for calculating current cache image, wherein brightness value is high
Weight in the region of the first luminance threshold is higher than the weight in other regions；Wherein, the current cache image is according to brightness point
Cloth situation is divided into multiple regions, and each region includes one or more pixel；
Picture catching control module, for being caught according to the exposure parameter determined by the luminance weighted average value to control camera
Image is caught, as pending image；
HDR image generation module, it is bright less than the region of the second luminance threshold for promoting brightness value in the pending image
Degree, and generate HDR image.
8. device according to claim 7, which is characterized in that the HDR image generation module includes：
Gamma parameter calculation unit, for calculating gamma parameter according to the luminance statistic data of the pending image；
Pending image control unit, for being adjusted to the pending image according to the gamma parameter, to be promoted
It states brightness value in pending image and obtains sample image less than the brightness in the region of the second luminance threshold；
HDR image generation unit, for generating HDR image according to the sample image.
9. device according to claim 8, which is characterized in that the HDR image generation unit is specifically used for：
Noise reduction process is carried out to the sample image, and generates HDR image.
10. device according to claim 9, which is characterized in that the HDR image generation unit is specifically used for：
Noise reduction process is carried out to the sample image using wavelet de-noising algorithm and/or multiframe noise reduction algorithm, and generates HDR figures
Picture.
11. device according to claim 8, which is characterized in that the HDR image generation unit includes：
Preview interface controls subelement, for controlling preview interface real-time display sample image；
Current sample image obtains subelement, for when receiving photographing instruction, obtain the preview interface show it is current
Sample image；
HDR image generates subelement, for generating HDR image according to the current sample image.
12. device according to claim 8, which is characterized in that the luminance statistic data of the pending image includes：Institute
State the brightness histogram of the subregion average brightness and the pending image of pending image.
13. a kind of mobile terminal, which is characterized in that the mobile terminal is integrated with the height as described in claim 7-12 any one
The generating means of dynamic range HDR image.
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