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HDR imaging
[Computational Photography]
This section describes high dynamic range imaging algorithms namely tonemapping, exposure alignment, camera calibration with multiple exposures and exposure fusion. More...
Data Structures | |
| class | Tonemap |
| Base class for tonemapping algorithms - tools that are used to map HDR image to 8-bit range. More... | |
| class | TonemapDrago |
| Adaptive logarithmic mapping is a fast global tonemapping algorithm that scales the image in logarithmic domain. More... | |
| class | TonemapDurand |
| This algorithm decomposes image into two layers: base layer and detail layer using bilateral filter and compresses contrast of the base layer thus preserving all the details. More... | |
| class | TonemapReinhard |
| This is a global tonemapping operator that models human visual system. More... | |
| class | TonemapMantiuk |
| This algorithm transforms image to contrast using gradients on all levels of gaussian pyramid, transforms contrast values to HVS response and scales the response. More... | |
| class | AlignExposures |
| The base class for algorithms that align images of the same scene with different exposures. More... | |
| class | AlignMTB |
| This algorithm converts images to median threshold bitmaps (1 for pixels brighter than median luminance and 0 otherwise) and than aligns the resulting bitmaps using bit operations. More... | |
| class | CalibrateCRF |
| The base class for camera response calibration algorithms. More... | |
| class | CalibrateDebevec |
| Inverse camera response function is extracted for each brightness value by minimizing an objective function as linear system. More... | |
| class | CalibrateRobertson |
| Inverse camera response function is extracted for each brightness value by minimizing an objective function as linear system. More... | |
| class | MergeExposures |
| The base class algorithms that can merge exposure sequence to a single image. More... | |
| class | MergeDebevec |
| The resulting HDR image is calculated as weighted average of the exposures considering exposure values and camera response. More... | |
| class | MergeMertens |
| Pixels are weighted using contrast, saturation and well-exposedness measures, than images are combined using laplacian pyramids. More... | |
| class | MergeRobertson |
| The resulting HDR image is calculated as weighted average of the exposures considering exposure values and camera response. More... | |
Functions | |
| CV_EXPORTS_W Ptr< Tonemap > | createTonemap (float gamma=1.0f) |
| Creates simple linear mapper with gamma correction. | |
| CV_EXPORTS_W Ptr< TonemapDrago > | createTonemapDrago (float gamma=1.0f, float saturation=1.0f, float bias=0.85f) |
| Creates TonemapDrago object. | |
| CV_EXPORTS_W Ptr< TonemapDurand > | createTonemapDurand (float gamma=1.0f, float contrast=4.0f, float saturation=1.0f, float sigma_space=2.0f, float sigma_color=2.0f) |
| Creates TonemapDurand object. | |
| CV_EXPORTS_W Ptr< TonemapReinhard > | createTonemapReinhard (float gamma=1.0f, float intensity=0.0f, float light_adapt=1.0f, float color_adapt=0.0f) |
| Creates TonemapReinhard object. | |
| CV_EXPORTS_W Ptr< TonemapMantiuk > | createTonemapMantiuk (float gamma=1.0f, float scale=0.7f, float saturation=1.0f) |
| Creates TonemapMantiuk object. | |
| CV_EXPORTS_W Ptr< AlignMTB > | createAlignMTB (int max_bits=6, int exclude_range=4, bool cut=true) |
| Creates AlignMTB object. | |
| CV_EXPORTS_W Ptr < CalibrateDebevec > | createCalibrateDebevec (int samples=70, float lambda=10.0f, bool random=false) |
| Creates CalibrateDebevec object. | |
| CV_EXPORTS_W Ptr < CalibrateRobertson > | createCalibrateRobertson (int max_iter=30, float threshold=0.01f) |
| Creates CalibrateRobertson object. | |
| CV_EXPORTS_W Ptr< MergeDebevec > | createMergeDebevec () |
| Creates MergeDebevec object. | |
| CV_EXPORTS_W Ptr< MergeMertens > | createMergeMertens (float contrast_weight=1.0f, float saturation_weight=1.0f, float exposure_weight=0.0f) |
| Creates MergeMertens object. | |
| CV_EXPORTS_W Ptr< MergeRobertson > | createMergeRobertson () |
| Creates MergeRobertson object. | |
Detailed Description
This section describes high dynamic range imaging algorithms namely tonemapping, exposure alignment, camera calibration with multiple exposures and exposure fusion.
Function Documentation
| CV_EXPORTS_W Ptr<AlignMTB> cv::createAlignMTB | ( | int | max_bits = 6, |
| int | exclude_range = 4, |
||
| bool | cut = true |
||
| ) |
Creates AlignMTB object.
- Parameters:
-
max_bits logarithm to the base 2 of maximal shift in each dimension. Values of 5 and 6 are usually good enough (31 and 63 pixels shift respectively). exclude_range range for exclusion bitmap that is constructed to suppress noise around the median value. cut if true cuts images, otherwise fills the new regions with zeros.
| CV_EXPORTS_W Ptr<CalibrateDebevec> cv::createCalibrateDebevec | ( | int | samples = 70, |
| float | lambda = 10.0f, |
||
| bool | random = false |
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| ) |
Creates CalibrateDebevec object.
- Parameters:
-
samples number of pixel locations to use lambda smoothness term weight. Greater values produce smoother results, but can alter the response. random if true sample pixel locations are chosen at random, otherwise the form a rectangular grid.
| CV_EXPORTS_W Ptr<CalibrateRobertson> cv::createCalibrateRobertson | ( | int | max_iter = 30, |
| float | threshold = 0.01f |
||
| ) |
Creates CalibrateRobertson object.
- Parameters:
-
max_iter maximal number of Gauss-Seidel solver iterations. threshold target difference between results of two successive steps of the minimization.
| CV_EXPORTS_W Ptr<MergeDebevec> cv::createMergeDebevec | ( | ) |
Creates MergeDebevec object.
| CV_EXPORTS_W Ptr<MergeMertens> cv::createMergeMertens | ( | float | contrast_weight = 1.0f, |
| float | saturation_weight = 1.0f, |
||
| float | exposure_weight = 0.0f |
||
| ) |
Creates MergeMertens object.
- Parameters:
-
contrast_weight contrast measure weight. See MergeMertens. saturation_weight saturation measure weight exposure_weight well-exposedness measure weight
| CV_EXPORTS_W Ptr<MergeRobertson> cv::createMergeRobertson | ( | ) |
Creates MergeRobertson object.
| CV_EXPORTS_W Ptr<Tonemap> cv::createTonemap | ( | float | gamma = 1.0f ) |
Creates simple linear mapper with gamma correction.
- Parameters:
-
gamma positive value for gamma correction. Gamma value of 1.0 implies no correction, gamma equal to 2.2f is suitable for most displays. Generally gamma > 1 brightens the image and gamma < 1 darkens it.
| CV_EXPORTS_W Ptr<TonemapDrago> cv::createTonemapDrago | ( | float | gamma = 1.0f, |
| float | saturation = 1.0f, |
||
| float | bias = 0.85f |
||
| ) |
Creates TonemapDrago object.
- Parameters:
-
gamma gamma value for gamma correction. See createTonemap saturation positive saturation enhancement value. 1.0 preserves saturation, values greater than 1 increase saturation and values less than 1 decrease it. bias value for bias function in [0, 1] range. Values from 0.7 to 0.9 usually give best results, default value is 0.85.
| CV_EXPORTS_W Ptr<TonemapDurand> cv::createTonemapDurand | ( | float | gamma = 1.0f, |
| float | contrast = 4.0f, |
||
| float | saturation = 1.0f, |
||
| float | sigma_space = 2.0f, |
||
| float | sigma_color = 2.0f |
||
| ) |
Creates TonemapDurand object.
- Parameters:
-
gamma gamma value for gamma correction. See createTonemap contrast resulting contrast on logarithmic scale, i. e. log(max / min), where max and min are maximum and minimum luminance values of the resulting image. saturation saturation enhancement value. See createTonemapDrago sigma_space bilateral filter sigma in color space sigma_color bilateral filter sigma in coordinate space
| CV_EXPORTS_W Ptr<TonemapMantiuk> cv::createTonemapMantiuk | ( | float | gamma = 1.0f, |
| float | scale = 0.7f, |
||
| float | saturation = 1.0f |
||
| ) |
Creates TonemapMantiuk object.
- Parameters:
-
gamma gamma value for gamma correction. See createTonemap scale contrast scale factor. HVS response is multiplied by this parameter, thus compressing dynamic range. Values from 0.6 to 0.9 produce best results. saturation saturation enhancement value. See createTonemapDrago
| CV_EXPORTS_W Ptr<TonemapReinhard> cv::createTonemapReinhard | ( | float | gamma = 1.0f, |
| float | intensity = 0.0f, |
||
| float | light_adapt = 1.0f, |
||
| float | color_adapt = 0.0f |
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| ) |
Creates TonemapReinhard object.
- Parameters:
-
gamma gamma value for gamma correction. See createTonemap intensity result intensity in [-8, 8] range. Greater intensity produces brighter results. light_adapt light adaptation in [0, 1] range. If 1 adaptation is based only on pixel value, if 0 it's global, otherwise it's a weighted mean of this two cases. color_adapt chromatic adaptation in [0, 1] range. If 1 channels are treated independently, if 0 adaptation level is the same for each channel.
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