CN105578068A - High-dynamic-range image generation method, device and mobile terminal - Google Patents
High-dynamic-range image generation method, device and mobile terminal Download PDFInfo
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- CN105578068A CN105578068A CN201510973323.3A CN201510973323A CN105578068A CN 105578068 A CN105578068 A CN 105578068A CN 201510973323 A CN201510973323 A CN 201510973323A CN 105578068 A CN105578068 A CN 105578068A
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- 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 provides a high-dynamic-range image generation method, a device and a mobile terminal. The method comprises the steps of calculating the brightness weighted average of a currently cached image, wherein the weight of a region with the brightness value thereof larger than a first brightness threshold is larger than the weight of other regions; controlling a camera to capture an image as a to-be-processed image according to exposure parameters determined based on the brightness weighted average; increasing the brightness of a region with the brightness value thereof smaller than a second brightness threshold in the to-be-processed image to generate an HDR image. According to the embodiments of the invention, based on the above technical scheme, the dynamic range of HDR images is effectively enlarged. Meanwhile, the HDR image can be generated without being synthesized by multiple photographed images, so that the processing speed is increased. The rapid photographing effect is realized.
Description
Technical field
The embodiment of the present invention relates to technical field of image processing, particularly relates to a kind of generation method of high dynamic range images, device and mobile terminal.
Background technology
High dynamic range (HighDynamicRange, HDR) image, compared with normal image, can provide more dynamic range and image detail, better can reflect the visual effect in people's true environment.
At present, the mobile terminal such as many digital cameras and the mobile phone being configured with camera all supports HDR exposal model, and this pattern is particularly useful for taking pictures in the shooting environmental of backlight.When current environment is backlight state, common exposal model is due to dynamic range deficiency, and captured photo often occurs that the problem of exposing to the sun is owed in bright place overexposure or dark place, adopts HDR exposal model can effectively improve this problem.
In existing HDR exposal model, usually need the photo of the different depth of exposures taking multiple Same Scene, these photos are synthesized, generate HDR image.Such as, take that three brightness are respectively brighter, intermediate light and darker photo, when by software process quality, the parts of images of relative exposure deficiency in intermediate light photo parts of images corresponding in brighter photo is replaced, and parts of images parts of images corresponding in the darker photo replacement that relative exposure is excessive, finally synthesize HDR image, the program needs to take multiple different brightness photos, speed is comparatively slow, cannot meet consumers' demand.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of generation method of high dynamic range images, device and mobile terminal, generates the slow problem of scheme processing speed to solve existing high dynamic range images.
First aspect, embodiments provides a kind of generation method of high dynamic range images, comprising:
Calculate the luminance weighted mean value of current cache image, wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions;
Control camera according to the exposure parameter determined by described luminance weighted mean value and catch image, as pending image;
To promote in described pending image brightness value lower than the brightness in the region of the second luminance threshold, and generate HDR image.
Second aspect, embodiments provides a kind of generating apparatus of high dynamic range images, comprising:
Luminance weighted mean value calculation module, for calculating the luminance weighted mean value of current cache image, wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions;
Picture catching control module, catches image, as pending image for controlling camera according to the exposure parameter determined by described luminance weighted mean value;
HDR image generation module, for promoting in described pending image brightness value lower than the brightness in the region of the second luminance threshold, and generates HDR image.
The third aspect, the embodiment of the present invention additionally provides a kind of mobile terminal being integrated with the generating apparatus of aforementioned high dynamic range images.
The generation scheme of the high dynamic range images provided in the embodiment of the present invention, calculate the luminance weighted mean value of current cache image, and improve the weight of brightness value higher than the region of the first luminance threshold, compare with existing scheme in calculate average brightness, the integral image brightness value calculated is higher, the exposure parameter determined according to this can ensure that clear zone there will not be over-exposed situation when controlling camera and catching image.By the image that catches using above-mentioned exposure parameter as pending image, to promote in pending image brightness value lower than the brightness in the region of the second luminance threshold, and generate HDR image, effectively can improve the dynamic range of HDR image, and the program does not need shooting multiple pictures to synthesize HDR image, can processing speed be promoted, realize snapshots.
Accompanying drawing explanation
The schematic flow sheet of the generation method of a kind of high dynamic range images that Fig. 1 provides for the embodiment of the present invention one;
The schematic flow sheet of the generation method of a kind of high dynamic range images that Fig. 2 provides for the embodiment of the present invention two;
The schematic flow sheet of the generation method of a kind of preferred high dynamic range images that Fig. 3 provides for the embodiment of the present invention three;
The structured flowchart of the generating apparatus of a kind of high dynamic range images that Fig. 4 provides for the embodiment of the present invention four.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with accompanying drawing.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Before in further detail exemplary embodiment being discussed, it should be mentioned that some exemplary embodiments are described as the process or method described as flow chart.Although each step is described as the process of order by flow chart, many steps wherein can be implemented concurrently, concomitantly or simultaneously.In addition, the order of each step can be rearranged.Described process can be terminated when its operations are completed, but can also have the additional step do not comprised in the accompanying drawings.Described process can correspond to method, function, code, subroutine, subprogram etc.
Embodiment one
The schematic flow sheet of the generation method of a kind of high dynamic range images that Fig. 1 provides for the embodiment of the present invention one, the method can be performed by the generating apparatus of high dynamic range images, wherein this device can by software and/or hardware implementing, and general accessible site in the terminal.As shown in Figure 1, the method comprises:
The luminance weighted mean value of step 101, calculating current cache image.
Wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions.
Exemplary, the mobile terminal in the present embodiment specifically can be the terminals such as mobile phone, panel computer and digital camera, is preferably smart mobile phone.
Exemplary, current cache image can be divided into multiple region according to Luminance Distribution situation, and each region can comprise one or more pixel.Exemplary, the brightness value in a region specifically can be in this region the mean value of all pixels comprised.Described first luminance threshold can be arranged by system default, also can be arranged according to personal habits by user.First luminance threshold can be a fixing brightness value, also can be the brightness value of a dynamic conditioning.Such as, when the first luminance threshold is set to the brightness value of a dynamic conditioning, the preset ratio value of the average brightness of current cache image can be set to, as 120%.
Exemplary, brightness value also can be arranged by system default higher than the weight in the region of the first luminance threshold and the weight in other regions, or is arranged according to personal habits by user.
Exemplary, overall Exposure Metering can be adopted to obtain the photometric data of current cache image, the brightness value of each pixel in photometric data, can be comprised.
The exposure parameter that step 102, basis are determined by luminance weighted mean value controls camera and catches image, as pending image.
Exemplary, described exposure parameter can comprise the time for exposure.Usually weigh integral image brightness with the average brightness of image in existing scheme, and determine the time for exposure according to average brightness.In the present embodiment, adopt the luminance weighted mean value calculated in step 101 to weigh integral image brightness, in computational process, improve the weight of brightness value higher than the region of the first luminance threshold, so this luminance weighted mean value is higher than the average brightness in existing scheme, the time for exposure determined according to this is shorter, can ensure that clear zone there will not be over-exposed situation when controlling camera according to this time for exposure and catching image.
Step 103, to promote in pending image brightness value lower than the brightness in the region of the second luminance threshold, and generate HDR image.
Exemplary, owing to shortening the time for exposure, the overall brightness of pending image can reduce, in order to ensure that the details of dark place is not lost, this step does luminance raising process, to show the more details of dark place to brightness value in pending image lower than the region (region, dark place) of the second luminance threshold.Described second luminance threshold can be arranged by system default, also can be arranged according to personal habits by user.Second luminance threshold can be a fixing brightness value, also can be the brightness value of a dynamic conditioning.
Exemplary, gamma (Gamma) parameter (as gamma curve) that region, dark place can be adjusted to appropriate brightness can be calculated, and according to Gamma parameter, pending image is adjusted, finally generate that dynamic range is wider, the more HDR image of image detail.
The generation method of the high dynamic range images that the embodiment of the present invention one provides, calculate the luminance weighted mean value of current cache image, and improve the weight of brightness value higher than the region of the first luminance threshold, compare with existing scheme in calculate average brightness, the integral image brightness value calculated is higher, the exposure parameter determined according to this can ensure that clear zone there will not be over-exposed situation when controlling camera and catching image.By the image that catches using above-mentioned exposure parameter as pending image, to promote in pending image brightness value lower than the brightness in the region of the second luminance threshold, and generate HDR image, effectively can improve the dynamic range of HDR image, and the method does not need shooting multiple pictures to synthesize HDR image, can processing speed be promoted, realize snapshots.
Embodiment two
The schematic flow sheet of the generation method of a kind of high dynamic range images that Fig. 2 provides for the embodiment of the present invention two, the present embodiment is optimized based on above-described embodiment, in the present embodiment, step " to be promoted in pending image brightness value lower than the brightness in the region of the second luminance threshold, and generates HDR image " and is optimized for: the luminance statistic data according to pending image calculates gamma parameter; According to gamma parameter, pending image is adjusted, lower than the brightness in the region of the second luminance threshold, obtain sample image to promote brightness value in pending image; HDR image is generated according to sample image.
Accordingly, the method for the present embodiment comprises the steps:
The luminance weighted mean value of step 201, calculating current cache image.
Wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions.
The exposure parameter that step 202, basis are determined by luminance weighted mean value controls camera and catches image, as pending image.
Step 203, calculate gamma parameter according to the luminance statistic data of pending image.
Exemplary, the luminance statistic data of pending image can comprise: the subregion average brightness of pending image and the brightness histogram of pending image.Such as, pending image averaging can be divided into N number of subregion, the average brightness of subregion i (1≤i≤N) is the mean value of the brightness of all pixels comprised in subregion i.Brightness histogram, also known as color range, be abscissa with brightness value, take pixel quantity as the image of ordinate, the quantity of the brightness histogram graphically pixel of each gray scale of image, presents pixel distribution situation in the picture.
Exemplary, Gamma parameter can comprise gamma curve or Gamma value.Gamma curve is a kind of special tint ramp, and when Gamma value equals 1 time, curve is the straight line at 45 ° with reference axis, represents that input and output density is identical this time.Output darkening will be caused higher than the Gamma value of 1, output brightening will be caused lower than the Gamma value of 1.In existing scheme, Gamma parameter is generally the fixed value pre-set, or directly chooses corresponding Gamma parameter according to different exposal models; And in the present embodiment, recalculate Gamma parameter according to the luminance statistic data of pending image, so that follow-up, pending image is adjusted.
Step 204, according to gamma parameter, pending image to be adjusted, lower than the brightness in the region of the second luminance threshold, obtain sample image to promote brightness value in pending image.
Exemplary, after pending image being adjusted according to the Gamma parameter calculated in step 203, the brightness in region, dark place in pending image can be promoted.
Step 205, according to sample image generate HDR image.
The generation method of the high dynamic range images that the embodiment of the present invention two provides, luminance statistic data according to pending image calculates Gamma parameter, and according to Gamma parameter, pending image is adjusted, to promote the brightness in region, dark place in pending image, final generation HDR image, the picture quality of HDR image can be promoted further, represent more image detail, meet consumers' demand.In addition, based on luminance statistic data, pending image is adjusted, little to the consumption of processor, thus the utilization rate of processor can be reduced, further optimizing user is experienced.
On the basis of above-described embodiment, step " generates HDR image according to sample image " and can be optimized for further: carry out noise reduction process to sample image, and generate HDR image.The benefit done like this is, when adjusting pending image according to Gamma parameter, may introduce noise, in order to promote photographic quality further, first can carry out noise reduction process, regeneration HDR image to sample image.
Further, wavelet de-noising algorithm and/or multiframe noise reduction algorithm can be utilized to carry out noise reduction process to sample image, and generate HDR image.The described multiframe noise reduction algorithm that utilizes carries out noise reduction process to sample image, specifically can comprise: obtain multiple other sample images before or after current sample image, carries out synthesis noise reduction process to current sample image and multiple other sample images described.
Preferably, after wavelet de-noising algorithm can being utilized respectively to carry out noise reduction process to multiple sample images, recycling multiframe noise reduction algorithm carries out noise reduction process, finally generates HDR image, can promote noise reduction further.
Embodiment three
The schematic flow sheet of the generation method of a kind of preferred high dynamic range images that Fig. 3 provides for the embodiment of the present invention three, the method is particularly useful for postponing (ZeroSecondDelay, ZSD in 0 second; Also known as ZeroSecondLater, ZSL) exposal model.As shown in Figure 3, the method comprises the steps:
The luminance weighted mean value of step 301, calculating current cache image.
Wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions.
Exemplary, ZSD exposal model can be regarded as clap i.e. gained, it is exactly the photo that user sees in preview interface that user presses the photo that key of taking pictures photographs that time, and it is taken pictures relative to general mode.Take pictures in the normal mode, need after pressing key of taking pictures to carry out processing a series ofly and correcting, as operations such as focusing, adjustment exposure, adjustment white balances, and then carry out coding generation photo.Such as, when preview 30 transmission frame (FramesPerSecond, fps) per second, it is at the 1st frame that user presses when taking pictures key, and the photo in fact taken may be the image of the 8th frame.And under ZSD pattern, can buffer memory some two field pictures, press user the key that time of taking pictures, extracting directly caching frame carries out encoding and generating photo.Such as, when preview 30fps, it is at the 1st frame that user presses when taking pictures key, then the photo that actual arsis obtains also is the image of the 1st frame.
Exemplary, this step can by automatic exposure state modulator (AutomaticExposureControl, AEC) algorithm has come, and overall Exposure Metering specifically can be adopted to obtain photometric data, and calculate described luminance weighted mean value according to photometric data.
The exposure parameter that step 302, basis are determined by luminance weighted mean value controls camera and catches image, as pending image.
Step 303, calculate gamma parameter according to the luminance statistic data of pending image.
Exemplary, Gamma parameter for promoting dark place regional luminance in pending image can be calculated by Gamma adjustment algorithm according to the subregion average brightness of pending image and brightness histogram.
Step 304, according to gamma parameter, pending image to be adjusted, lower than the brightness in the region of the second luminance threshold, obtain sample image to promote brightness value in pending image.
Step 305, control preview interface show sample image in real time.
Exemplary, the Gamma parameter read-in image-signal processor (ImageSignalProcessor that can will calculate, ISP), and show sample image in real time by ISP control preview interface, enable user see the image with HDR effect in preview interface, facilitate user to catch the picture oneself liked.
Step 306, judge whether to receive photographing instruction, if so, then perform step 307; Otherwise, continue to perform step 306.
Exemplary, when user presses key of taking pictures (or shutter key), can photographing instruction be received.
The current sample image of step 307, the display of acquisition preview interface.
Step 308, noise reduction process is carried out to current sample image, and generate HDR image.
Further, wavelet de-noising algorithm and/or multiframe noise reduction algorithm can be utilized to carry out noise reduction process to sample image, and generate HDR image.
The generation method of the high dynamic range images that the embodiment of the present invention three provides, the sample image possessing HDR effect can be shown in real time in preview interface, be applicable to ZSD exposal model, when user sees oneself satisfied sample image in preview interface, press key of taking pictures, mobile terminal will obtain current sample image, and carries out noise reduction process to current sample image, generates HDR image.The method combines with ZSD exposal model, allowing user easily realize taking HDR photo by observing preview interface, can promote user further and taking experience.
Embodiment four
The structured flowchart of the generating apparatus of a kind of high dynamic range images that Fig. 4 provides for the embodiment of the present invention four, this device can by software and/or hardware implementing, generally in a mobile device integrated, the generation method by performing high dynamic range images realizes shooting HDR photo.As shown in Figure 4, this device comprises: luminance weighted mean value calculation module 401, picture catching control module 402 and HDR image generation module 403.
Wherein, luminance weighted mean value calculation module 401, for calculating the luminance weighted mean value of current cache image, wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions; Picture catching control module 402, catches image, as pending image for controlling camera according to the exposure parameter determined by described luminance weighted mean value; HDR image generation module 403, for promoting in described pending image brightness value lower than the brightness in the region of the second luminance threshold, and generates HDR image.
The generating apparatus of the high dynamic range images that the embodiment of the present invention four provides, the luminance weighted mean value of current cache image is calculated by luminance weighted mean value calculation module 401, and improve the weight of brightness value higher than the region of the first luminance threshold, compare with existing scheme in calculate average brightness, the integral image brightness value calculated is higher, the exposure parameter that picture catching control module 402 is determined according to this can ensure when controlling camera and catching image, clear zone there will not be over-exposed situation, by the image that catches using above-mentioned exposure parameter as pending image, brightness value is promoted in pending image lower than the brightness in the region of the second luminance threshold by HDR image generation module 403, and generate HDR image, effectively can improve the dynamic range of HDR image, and the method does not need shooting multiple pictures to synthesize HDR image, processing speed can be promoted, realize snapshots.
On the basis of above-described embodiment, described HDR image generation module comprises gamma parameter calculation unit, pending image control unit and HDR image generation unit.Wherein, gamma parameter calculation unit, calculates gamma parameter for the luminance statistic data according to described pending image; Pending image control unit, for adjusting described pending image according to described gamma parameter, lower than the brightness in the region of the second luminance threshold, obtains sample image to promote brightness value in described pending image; HDR image generation unit, for generating HDR image according to described sample image.
On the basis of above-described embodiment, described HDR image generation unit specifically for: noise reduction process is carried out to described sample image, and generates HDR image.
On the basis of above-described embodiment, described HDR image generation unit specifically for: utilize wavelet de-noising algorithm and/or multiframe noise reduction algorithm to carry out noise reduction process to described sample image, and generate HDR image.
On the basis of above-described embodiment, described HDR image generation unit comprises preview interface and controls subelement, current sample image acquisition subelement and HDR image generation subelement.Wherein, preview interface controls subelement, shows sample image in real time for controlling preview interface; Current sample image obtains subelement, for when receiving photographing instruction, obtains the current sample image of described preview interface display; HDR image generates subelement, for generating HDR image according to described current sample image.
On the basis of above-described embodiment, the luminance statistic data of described pending image comprises: the subregion average brightness of described pending image and the brightness histogram of described pending image.
Embodiment five
The embodiment of the present invention five provides a kind of mobile terminal, and this mobile terminal is integrated with the generating apparatus of the high dynamic range images in the embodiment of the present invention, and the generation method by performing high dynamic range images realizes shooting HDR photo.
Exemplary, the mobile terminal in the present embodiment specifically can be the terminals such as mobile phone, panel computer and digital camera, is preferably smart mobile phone.
When using the mobile terminal shooting HDR photo in the present embodiment as user, captured HDR photo possesses higher dynamic range, and speed of taking pictures is fast, can promote user and take experience.
The generating apparatus of the high dynamic range images provided in above-described embodiment and mobile terminal can perform the generation method of the high dynamic range images that any embodiment of the present invention provides, and possess and perform the corresponding functional module of the method and beneficial effect.The not ins and outs of detailed description in the above-described embodiments, the generation method of the high dynamic range images that can provide see any embodiment of the present invention.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (13)
1. a generation method for high dynamic range HDR image, is characterized in that, comprising:
Calculate the luminance weighted mean value of current cache image, wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions;
Control camera according to the exposure parameter determined by described luminance weighted mean value and catch image, as pending image;
To promote in described pending image brightness value lower than the brightness in the region of the second luminance threshold, and generate HDR image.
2. method according to claim 1, is characterized in that, to promote in described pending image brightness value lower than the brightness in the region of the second luminance threshold, and generates HDR image, comprising:
Luminance statistic data according to described pending image calculates gamma parameter;
According to described gamma parameter, described pending image is adjusted, lower than the brightness in the region of the second luminance threshold, obtain sample image to promote brightness value in described pending image;
HDR image is generated according to described sample image.
3. method according to claim 2, is characterized in that, generates HDR image, comprising according to described sample image:
Noise reduction process is carried out to described sample image, and generates HDR image.
4. method according to claim 3, is characterized in that, carries out noise reduction process, and generates HDR image, comprising described sample image:
Utilize wavelet de-noising algorithm and/or multiframe noise reduction algorithm to carry out noise reduction process to described sample image, and generate HDR image.
5. method according to claim 2, is characterized in that, generates HDR image, comprising according to described sample image:
Control preview interface and show sample image in real time;
When receiving photographing instruction, obtain the current sample image of described preview interface display;
HDR image is generated according to described current sample image.
6. method according to claim 2, is characterized in that, the luminance statistic data of described pending image comprises: the subregion average brightness of described pending image and the brightness histogram of described pending image.
7. a generating apparatus for high dynamic range HDR image, is characterized in that, comprising:
Luminance weighted mean value calculation module, for calculating the luminance weighted mean value of current cache image, wherein, brightness value higher than the weight in the region of the first luminance threshold higher than the weight in other regions;
Picture catching control module, catches image, as pending image for controlling camera according to the exposure parameter determined by described luminance weighted mean value;
HDR image generation module, for promoting in described pending image brightness value lower than the brightness in the region of the second luminance threshold, and generates HDR image.
8. device according to claim 7, is characterized in that, described HDR image generation module comprises:
Gamma parameter calculation unit, calculates gamma parameter for the luminance statistic data according to described pending image;
Pending image control unit, for adjusting described pending image according to described gamma parameter, lower than the brightness in the region of the second luminance threshold, obtains sample image to promote brightness value in described pending image;
HDR image generation unit, for generating HDR image according to described sample image.
9. device according to claim 8, is characterized in that, described HDR image generation unit specifically for:
Noise reduction process is carried out to described sample image, and generates HDR image.
10. device according to claim 9, is characterized in that, described HDR image generation unit specifically for:
Utilize wavelet de-noising algorithm and/or multiframe noise reduction algorithm to carry out noise reduction process to described sample image, and generate HDR image.
11. devices according to claim 8, is characterized in that, described HDR image generation unit comprises:
Preview interface controls subelement, shows sample image in real time for controlling preview interface;
Current sample image obtains subelement, for when receiving photographing instruction, obtains the current sample image of described preview interface display;
HDR image generates subelement, for generating HDR image according to described current sample image.
12. devices according to claim 8, is characterized in that, the luminance statistic data of described pending image comprises: the subregion average brightness of described pending image and the brightness histogram of described pending image.
13. 1 kinds of mobile terminals, is characterized in that, this mobile terminal is integrated with the generating apparatus of the high dynamic range HDR image as described in claim 7-12 any one.
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