CN105898148B - Monitor the image composition method and device of wide dynamic camera - Google Patents
Monitor the image composition method and device of wide dynamic camera Download PDFInfo
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- 238000003786 synthesis reaction Methods 0.000 claims abstract description 87
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 86
- 238000012544 monitoring process Methods 0.000 claims abstract description 28
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- 230000001351 cycling effect Effects 0.000 claims description 7
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4038—Image mosaicing, e.g. composing plane images from plane sub-images
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/682—Vibration or motion blur correction
- H04N23/684—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time
- H04N23/6845—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time by combination of a plurality of images sequentially taken
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- H—ELECTRICITY
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/95—Computational photography systems, e.g. light-field imaging systems
- H04N23/951—Computational photography systems, e.g. light-field imaging systems by using two or more images to influence resolution, frame rate or aspect ratio
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Abstract
The present invention provides a kind of image composition methods and device for monitoring wide dynamic camera to reach the optimization of whole video pictures, avoid and reduce the influence of pseudo- gray scale phenomenon by modifying every frame picture synthetic weight shared in synthesis in real time.
Description
Technical field
The present invention relates to a kind of video processing techniques, refer in particular to a kind of image composition method for monitoring wide dynamic camera
And device.
Background technique
In safety-security area, especially bank, building apply such high dynamic range scene, to wide dynamic camera demand
And it requires higher and higher.Pseudo- gray scale phenomenon and overall contrast are performed poor always for wide dynamic camera video matter
The challenge proposed is measured, is especially worked for 24 hours, the diversified monitor camera of scene.And the generation of such problems, it is often wide
Control bad adaptability in the multiframe synthesis processing of dynamic camera causes.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of monitoring width dynamic camera that can adapt to scene changes
The image composition method and device of machine.
In order to solve the above-mentioned technical problem, a kind of the technical solution adopted by the present invention are as follows: figure for monitoring wide dynamic camera
Picture synthetic method, including step,
S1 the luminance information of image) is obtained；
S2 high bright part specific gravity in long exposure frame image) is calculated；
S3 the value of the lower limit factor of synthetic weight) is set；
S4 the value of the upper limit factor of synthetic weight) is determined according to high bright part specific gravity；
S5 the upper limit threshold and lower threshold of synthetic weight) are obtained according to the exposure ratio of long exposure frame and short exposure frames；Institute
It states upper limit threshold and lower threshold is located within the scope of pixel intensity, and the corresponding pixel intensity of upper limit threshold is greater than lower threshold pair
The pixel intensity answered；
S6) long exposure frame is carried out matching really respectively with upper limit threshold, lower threshold with the brightness of the pixel of short exposure frames
Fixed respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold,
The value of the synthetic weight capping factor if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted；
S7) image synthesizes, and each pixel of image synthesis multiplies respective conjunction according to long exposure frame and short exposure frames respective pixel
It is obtained at after weight divided by the sum of respective weight.
The invention further relates to a kind of image composition method for monitoring wide dynamic camera, including step,
S0 the quantity of the synthesis of image needed for) obtaining；
S1 the luminance information of image) is obtained；
S2 high bright part specific gravity in long exposure frame image) is calculated；
S3 the value of the lower limit factor of synthetic weight) is set；
S4 the value of the upper limit factor of synthetic weight) is determined according to high bright part specific gravity；
S5 the upper limit threshold and lower threshold of synthetic weight) are obtained according to the exposure ratio of long exposure frame and short exposure frames；Institute
It states upper limit threshold and lower threshold is located within the scope of pixel intensity, and the corresponding pixel intensity of upper limit threshold is greater than lower threshold pair
The pixel intensity answered；
S6) long exposure frame is carried out matching really respectively with upper limit threshold, lower threshold with the brightness of the pixel of short exposure frames
Fixed respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold,
The value of the synthetic weight capping factor if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted；
S8 each pixel of) composograph, composograph multiplies respective conjunction according to long exposure frame and short exposure frames respective pixel
It is obtained at after weight divided by the sum of respective weight；
S9) quantity of image synthesis subtracts 1；
S10) judge whether the quantity of image synthesis is greater than 1, otherwise export composograph, be, go to step S11；
S11 frame) is exposed using composograph as long, the luminance information of short exposure frames is then obtained, goes back to step S2.
Among the above, in the step S3, the value of the lower limit factor of synthetic weight is set as 0；In the step S4, according to
Judgement listed in Table simultaneously calculates determining upper limit factor value:
Among the above, in the step S5, pixel intensity range is 0-255；Step S5 is further obtained in the following manner
Upper limit threshold and lower threshold,
S51 lower threshold) is set as 50-76；
S52) upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames).
Among the above, in the step S2, being calculated in long exposure frame image according to setting luminance threshold is more than luminance threshold
Pixel accounting, and accounting is at least multiplied 1000 and obtains the high bright part specific gravity；The maximum value of the upper limit factor is
1000。
A kind of image synthesizer monitoring wide dynamic camera, it is characterised in that: including step,
Acquiring unit goes to highlighted computing unit for obtaining the luminance information of image；
Highlighted computing unit goes to factor setup unit for calculating high bright part specific gravity in long exposure frame image；
Factor setup unit, the value of the lower limit factor for setting synthetic weight, goes to factor specifying unit；
Factor specifying unit, the value of the upper limit factor for determining synthetic weight according to high bright part specific gravity, goes to threshold
It is worth determination unit；
Threshold value determination unit, for obtaining the upper limit threshold of synthetic weight according to the exposure ratio of long exposure frame and short exposure frames
With lower threshold, synthetic weight determination unit is gone to；The upper limit threshold and lower threshold are located within the scope of pixel intensity, and on
It limits the corresponding pixel intensity of threshold value and is greater than the corresponding pixel intensity of lower threshold；
Synthetic weight determination unit, for the brightness to long exposure frame and the pixel of short exposure frames respectively with upper limit threshold,
Lower threshold carries out matching and determines respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold, goes to image composing unit,
The value of the synthetic weight capping factor, goes to image composing unit if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted, goes to image composing unit；
Image composing unit, each pixel for image synthesis multiply respectively according to long exposure frame and short exposure frames respective pixel
It is obtained from after synthetic weight divided by the sum of respective weight.
The invention further relates to a kind of image synthesizer for monitoring wide dynamic camera, including step,
Acquiring unit is synthesized, for obtaining the quantity of required image synthesis, goes to acquiring unit；
Acquiring unit goes to highlighted computing unit for obtaining the luminance information for obtaining image；
Highlighted computing unit goes to factor setup unit for calculating high bright part specific gravity in long exposure frame image；
Factor setup unit, the value of the lower limit factor for setting synthetic weight, goes to factor specifying unit；
Factor specifying unit, the value of the upper limit factor for determining synthetic weight according to high bright part specific gravity, goes to threshold
It is worth determination unit；
Threshold value determination unit, for obtaining the upper limit threshold of synthetic weight according to the exposure ratio of long exposure frame and short exposure frames
With lower threshold, synthetic weight determination unit is gone to；The upper limit threshold and lower threshold are located within the scope of pixel intensity, and on
It limits the corresponding pixel intensity of threshold value and is greater than the corresponding pixel intensity of lower threshold；
Synthetic weight determination unit, for the brightness to long exposure frame and the pixel of short exposure frames respectively with upper limit threshold,
Lower threshold carries out matching and determines respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold, goes to image composing unit,
The value of the synthetic weight capping factor, goes to image composing unit if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted, goes to image composing unit；
Image composing unit, each pixel for composograph multiply respectively according to long exposure frame and short exposure frames respective pixel
It is obtained from after synthetic weight divided by the sum of respective weight, goes to synthesis and reduce unit；
Synthesis reduces unit, and the quantity for image synthesis subtracts 1, then goes to synthesis judging unit；
Judging unit is synthesized, for judging whether the quantity of image synthesis is greater than 1, composograph is otherwise exported, is, turn
To cycling element；
Cycling element then obtains the luminance information of short exposure frames, goes to height for exposing frame using composograph as long
Bright computing unit.
Among the above, the factor setup unit, for set synthetic weight the lower limit factor value as 0；The factor
Determination unit, for according to it is listed in Table judgement and calculate determining upper limit factor value:
Among the above, in the threshold value determination unit, pixel intensity range is 0-255；Threshold value determination unit, for by with
Under type obtains upper limit threshold and lower threshold,
S51 lower threshold) is set as 50-76；
S52) upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames).
Among the above, the highlighted computing unit is more than for being calculated in long exposure frame image according to setting luminance threshold
The pixel accounting of luminance threshold, and accounting is at least multiplied 1000 and obtains the high bright part specific gravity, it is single then to go to factor setting
Member；The maximum value of the upper limit factor is 1000.
The beneficial effects of the present invention are: by modifying every frame picture synthetic weight shared in synthesis in real time, reach
To the optimization of whole video pictures, the influence of pseudo- gray scale phenomenon is avoided and reduced
Detailed description of the invention
Specific structure of the invention is described in detail with reference to the accompanying drawing
Fig. 1 is the method flow diagram of the solution of the present invention one；
Fig. 2 is third degree curve sampling schematic diagram used in present invention specific implementation example；
Fig. 3 is the method flow diagram of the solution of the present invention two.
Specific embodiment
In order to describe the technical content, the structural feature, the achieved object and the effect of this invention in detail, below in conjunction with embodiment
And attached drawing is cooperated to be explained in detail.
Referring to Fig. 1, a kind of image composition method for monitoring wide dynamic camera, including step,
S1 the luminance information of image) is obtained；
It is different according to the synthesis model for monitoring wide dynamic camera work, it herein at least can be straight from wide dynamic camera is monitored
The luminance information for the image for taking that at least two exposed frame amounts are different is obtained, and the shutter of usually first frame image is slower than the second frame image
(both the light exposure of first frame image was longer than the second frame).S2 high bright part specific gravity in long exposure frame image) is calculated；
S3 the value of the lower limit factor of synthetic weight) is set；
S4 the value of the upper limit factor of synthetic weight) is determined according to high bright part specific gravity；
S5 the upper limit threshold and lower threshold of synthetic weight) are obtained according to the exposure ratio of long exposure frame and short exposure frames；Institute
It states upper limit threshold and lower threshold is located within the scope of pixel intensity, and the corresponding pixel intensity of upper limit threshold is greater than lower threshold pair
The pixel intensity answered；
S6) long exposure frame is carried out matching really respectively with upper limit threshold, lower threshold with the brightness of the pixel of short exposure frames
Fixed respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold,
The value of the synthetic weight capping factor if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted；
S7) image synthesizes, and each pixel of image synthesis multiplies respective conjunction according to long exposure frame and short exposure frames respective pixel
It is obtained at after weight divided by the sum of respective weight.
Effect of the invention, which is that, provides a kind of image composition method for monitoring wide dynamic camera, by real time
Every frame picture synthetic weight shared in synthesis is modified, the optimization of whole video pictures is reached, it is existing to avoid and reduce pseudo- gray scale
The influence of elephant.
It should be noted that this programme is suitable for the double frame synthesis of image.In the synthesis of double frames, for synthesizing two field pictures often
Wherein a frame is long exposure, and next frame is short exposure.As it can be seen that by using the method for the present invention, for long exposure frame in image
In synthesis process, if the synthetic weight of the pixel of different brightness is all maximum, synthesizes the whole pixel of meeting and take long exposure
(if doing normalized to before and after frames synthetic weight, specific gravity is smaller after the bigger processing of weighted value, can take at this time for light frame data
Short exposure frames data) short exposure frames data, the picture that output is exactly short exposure is synthesized in this way, high bright part rationally exposes, other
Region owes to expose, and whole image arranges partially dark.Conversely, whole points takes short exposure when the pixel synthetic weight of different brightness is all 0
Light frame data (just on the contrary, long exposure frame data can be taken in the case of same normalized).Synthesis output is exactly long expose in this way
The picture of light, dark place rationally expose, part overexposure at two.General image overexposure.
As it can be seen that there is weight, it is also necessary to which the synthesis of high effect can be realized by carrying out effective controlling party to synthetic weight, thus
Present invention control is as follows:
1, according to brightness value difference, different pixels uses different weight distributions, and dark place more exposes frame using long,
Namely synthetic weight is smaller.And bright place more uses short exposure frames, synthetic weight is larger.
2, for the scene of different light and shades difference ratio, need to modify the strategy of distribution.When high bright part specific gravity is high
It waits.The valid data of short exposure frames are opposite to be increased, and needs synthetic weight more to tilt toward short exposure, that is, the synthesis of more points
Weight will increase, this ensure that high bright part only exposes after synthesis, guarantee wide dynamic effect.
3, when high bright part specific gravity is lesser.Opposite processing is done with regard to needs and upper surface treatment, synthetic weight is more
Toward long exposure inclination, the synthetic weight of high bright part can not be excessive, needs to reduce accordingly, smaller according to ratio, weight is got over
Small, here if weight is excessive, composograph will have an impact the pseudo- gray scale phenomenon of picture quality in light and shade junction section, this
What a phenomenon was to try to avoid during processing.
Embodiment 1
Among the above, in the step S3, the value of the lower limit factor of synthetic weight is set as 0；In the step S4, according to
Judgement listed in Table simultaneously calculates determining upper limit factor value:
It is 0 calculation amount that can significantly simplify synthesis process by the value of the lower limit factor in the present embodiment.And in the upper limit factor
In the design mechanism of value, when the part that long exposure frame image is more than 20% is highlighted, then a excessive possibility row of overall exposing
Greatly, therefore the upper limit factor of maximum value is selected, reduces it in the weight of front and back two field pictures and load-bearing, reduces the region due to overexposure
To final synthesis bring puppet gradation effect.
Embodiment 2
Among the above, in the step S5, pixel intensity range is 0-255；Step S5 is further obtained in the following manner
Upper limit threshold and lower threshold,
S51 lower threshold) is set as 50-76；
S52) upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames).
In the present embodiment, by fixed lower threshold, then the mode of calculating upper limit threshold value makes processing and calculating process
It is highly efficient.And the setting of lower threshold volume is selected after inventor's many experiments, when pixel intensity range is in 0-255
When, lower threshold setting is best in brightness overall range totality 20%-30% effect.
Embodiment 3
Among the above, in the step S2, being calculated in long exposure frame image according to setting luminance threshold is more than luminance threshold
Pixel accounting, and accounting is at least multiplied 1000 and obtains the high bright part specific gravity；The maximum value of the upper limit factor is
1000。
In the present embodiment, integer is converted into the accounting (decimal point or percentage) calculated first, can be improved subsequent
Computational efficiency.This exterior multiplication can further be finely divided high bright part specific gravity, in the value for being greater than 1000 to increase subsequent weight
The precision of calculating.
Specific example:
For framei、framei+1Two frames are synthesized.In general, the frame in single synthesisiIt is long exposure frame,
framei+1It is short exposure frames.Synthesis process is as follows, a kind of image composition method monitoring wide dynamic camera, including step,
S1 the luminance information of frame1 image) is obtained；
S2 high bright part specific gravity precent_high1 in long exposure frame image) is calculated, by precent_high1 value model
It encloses and is converted into (0~1000)；
S3 the value factor0=0 of the lower limit factor of synthetic weight) is set；
S4 the value of the upper limit factor of synthetic weight) is determined according to following table；
In table, Max_factor=1000.
S5 the upper limit threshold thr0=64 for) setting synthetic weight, calculates according to formula thr1=240+2* (ratio1-8)
Lower threshold thr1.In formula, ratio1 is the exposure ratio of long exposure frame and short exposure frames, ratio1=shutter1/
Shutter2 (the shutter speed that shutter1/shutter2 is long exposure frame and short exposure frames).
Setting due to this method to composition-factor, by the way of third degree curve sampling comprising respectively include two
Thresholds-floor threshold thr0, upper limit threshold thr1, two factor values: lower limit factor factor0, upper limit factor factor1.Cause
This has just obtained all Fr1.factor0, the Fr1.factor1 of the composition-factor Alpha1 of frame1 image to this step,
Fr1.thr0,Fr1.thr1。
S6) long exposure frame is carried out matching really respectively with upper limit threshold, lower threshold with the brightness of the pixel of short exposure frames
Fixed respective synthetic weight, referring to fig. 2,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold,
The value of the synthetic weight capping factor if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted；
S7) image synthesizes, and carries out image synthesis according to the following formula
In formula: outputi+1For final output pixel, WiFor the synthetic weight of long exposure frame image, Wi+1For short exposure frames
Synthetic weight.Frame1For each pixel of long exposure frame image, frame2For each pixel of short exposure frames.
After each pixel of image synthesis multiplies respective synthetic weight by long exposure frame and short exposure frames respective pixel as a result,
It is obtained divided by the sum of respective weight.
Referring to Fig. 3, the invention further relates to a kind of image conjunctions of wide dynamic camera of the monitoring for being suitable for multiple image synthesis
At method, including step,
S0 the quantity of the synthesis of image needed for) obtaining；
S1 the luminance information of image) is obtained；
It is different according to the synthesis model for monitoring wide dynamic camera work, it herein at least can be straight from wide dynamic camera is monitored
The luminance information for getting the different image of multi-frame exposure amount is obtained, regardless of being the image of how many frame, the shutter of one frame image
(both the light exposure of a frame image was longer than next frame to the eternal shutter for being slower than next frame image, and next frame light exposure is longer than again next
Frame, and so on).
S2 high bright part specific gravity in long exposure frame image) is calculated；
S3 the value of the lower limit factor of synthetic weight) is set；
S4 the value of the upper limit factor of synthetic weight) is determined according to high bright part specific gravity；
S5 the upper limit threshold and lower threshold of synthetic weight) are obtained according to the exposure ratio of long exposure frame and short exposure frames；Institute
It states upper limit threshold and lower threshold is located within the scope of pixel intensity, and the corresponding pixel intensity of upper limit threshold is greater than lower threshold pair
The pixel intensity answered；
S6) long exposure frame is carried out matching really respectively with upper limit threshold, lower threshold with the brightness of the pixel of short exposure frames
Fixed respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold,
The value of the synthetic weight capping factor if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted；
S8 each pixel of) composograph, composograph multiplies respective conjunction according to long exposure frame and short exposure frames respective pixel
It is obtained at after weight divided by the sum of respective weight；
S9) quantity of image synthesis subtracts 1；
S10) judge whether the quantity of image synthesis is greater than 1, otherwise export composograph, be, go to step S11；
S11 frame) is exposed using composograph as long, the luminance information of short exposure frames is then obtained, goes back to step S2.
Effect of the invention, which is that, provides a kind of image composition method for monitoring wide dynamic camera, by real time
Every frame picture synthetic weight shared in synthesis is modified, the optimization of whole video pictures is reached, it is existing to avoid and reduce pseudo- gray scale
The influence of elephant.
It should be noted that this programme is suitable for image multiframe synthesis (more than 2 frames).In multiframe synthesis, it will do it first
Double frame synthesis, what double frame synthesis were used is long exposure for synthesize the past frame thereto of two field pictures, and next frame is short exposure.
After to be synthesized, then using composograph as frame image circulation step same as short exposure frames further close by synthetic weight
At knowing that all images complete synthesis so on circulate.
Likewise, by using the method for the present invention, for long exposure frame in image synthesizing procedure, if the picture of different brightness
When the synthetic weight of vegetarian refreshments is all maximum, then synthesizes the whole pixel of meeting and take long exposure frame data (if synthesizing power to before and after frames
Normalized is reformed, then specific gravity is smaller after the bigger processing of weighted value, can take short exposure frames data at this time) short exposure frame number
According to the synthesis output picture that is exactly short exposure in this way, high bright part rationally exposes, other regions owe to expose, and whole image arranges partially
Secretly.Conversely, whole points takes short exposure frames data (same normalized when the pixel synthetic weight of different brightness is all 0
In the case of just on the contrary, long exposure frame data can be taken).Synthesis output is exactly the long picture exposed in this way, and dark place rationally exposes, and two
Locate part overexposure.General image overexposure.
As it can be seen that there is weight, it is also necessary to which the synthesis of high effect can be realized by carrying out effective controlling party to synthetic weight, thus
Present invention control is as follows:
1, according to brightness value difference, different pixels uses different weight distributions, and dark place more exposes frame using long,
Namely synthetic weight is smaller.And bright place more uses short exposure frames, synthetic weight is larger.
2, for the scene of different light and shades difference ratio, need to modify the strategy of distribution.When high bright part specific gravity is high
It waits.The valid data of short exposure frames are opposite to be increased, and needs synthetic weight more to tilt toward short exposure, that is, the synthesis of more points
Weight will increase, this ensure that high bright part only exposes after synthesis, guarantee wide dynamic effect.
3, when high bright part specific gravity is lesser.Opposite processing is done with regard to needs and upper surface treatment, synthetic weight is more
Toward long exposure inclination, the synthetic weight of high bright part can not be excessive, needs to reduce accordingly, smaller according to ratio, weight is got over
Small, here if weight is excessive, composograph will have an impact the pseudo- gray scale phenomenon of picture quality in light and shade junction section, this
What a phenomenon was to try to avoid during processing.
This programme and above scheme only difference is that, this programme be for used in multiple image synthesis,
For example, front cross frame synthesis is identical as upper scheme if using in the synthesis of three frames, then the synthesis of third frame is then needed
According to frame2 luminance information, calculate the specific gravity precent_high2 of high bright part, by way of as before according to
According to precent_high2, factor0 is calculated, the value of factor1 calculates thr0 than ratio2 according to exposure, thr1's
Value.Finally obtain Fr2.factor0, Fr2.factor1, Fr2.thr0, Fr2.thr1.
Passing through iterative formula:
Carry out final synthesis.
Embodiment 4
Among the above, in the step S3, the value of the lower limit factor of synthetic weight is set as 0；In the step S4, according to
Judgement listed in Table simultaneously calculates determining upper limit factor value:
Embodiment 5
Among the above, in the step S5, pixel intensity range is 0-255；Step S5 is further obtained in the following manner
Upper limit threshold and lower threshold,
S51 lower threshold) is set as 50-76；
S52) upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames).
Embodiment 6
Among the above, in the step S2, being calculated in long exposure frame image according to setting luminance threshold is more than luminance threshold
Pixel accounting, and accounting is at least multiplied 1000 and obtains the high bright part specific gravity；The maximum value of the upper limit factor is
1000。
A kind of image synthesizer monitoring wide dynamic camera, it is characterised in that: including step,
Acquiring unit goes to highlighted computing unit for obtaining the luminance information of image；
Highlighted computing unit goes to factor setup unit for calculating high bright part specific gravity in long exposure frame image；
Factor setup unit, the value of the lower limit factor for setting synthetic weight, goes to factor specifying unit；
Factor specifying unit, the value of the upper limit factor for determining synthetic weight according to high bright part specific gravity, goes to threshold
It is worth determination unit；
Threshold value determination unit, for obtaining the upper limit threshold of synthetic weight according to the exposure ratio of long exposure frame and short exposure frames
With lower threshold, synthetic weight determination unit is gone to；The upper limit threshold and lower threshold are located within the scope of pixel intensity, and on
It limits the corresponding pixel intensity of threshold value and is greater than the corresponding pixel intensity of lower threshold；
Synthetic weight determination unit, for the brightness to long exposure frame and the pixel of short exposure frames respectively with upper limit threshold,
Lower threshold carries out matching and determines respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold, goes to image composing unit,
The value of the synthetic weight capping factor, goes to image composing unit if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted, goes to image composing unit；
Image composing unit, each pixel for image synthesis multiply respectively according to long exposure frame and short exposure frames respective pixel
It is obtained from after synthetic weight divided by the sum of respective weight.
The invention further relates to a kind of image synthesizer for monitoring wide dynamic camera, including step,
Acquiring unit is synthesized, for obtaining the quantity of required image synthesis, goes to acquiring unit；
Acquiring unit goes to highlighted computing unit for obtaining the luminance information for obtaining image；
Highlighted computing unit goes to factor setup unit for calculating high bright part specific gravity in long exposure frame image；
Factor setup unit, the value of the lower limit factor for setting synthetic weight, goes to factor specifying unit；
Factor specifying unit, the value of the upper limit factor for determining synthetic weight according to high bright part specific gravity, goes to threshold
It is worth determination unit；
Threshold value determination unit, for obtaining the upper limit threshold of synthetic weight according to the exposure ratio of long exposure frame and short exposure frames
With lower threshold, synthetic weight determination unit is gone to；The upper limit threshold and lower threshold are located within the scope of pixel intensity, and on
It limits the corresponding pixel intensity of threshold value and is greater than the corresponding pixel intensity of lower threshold；
Synthetic weight determination unit, for the brightness to long exposure frame and the pixel of short exposure frames respectively with upper limit threshold,
Lower threshold carries out matching and determines respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold, goes to image composing unit,
The value of the synthetic weight capping factor, goes to image composing unit if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted, goes to image composing unit；
Image composing unit, each pixel for composograph multiply respectively according to long exposure frame and short exposure frames respective pixel
It is obtained from after synthetic weight divided by the sum of respective weight, goes to synthesis and reduce unit；
Synthesis reduces unit, and the quantity for image synthesis subtracts 1, then goes to synthesis judging unit；
Judging unit is synthesized, for judging whether the quantity of image synthesis is greater than 1, composograph is otherwise exported, is, turn
To cycling element；
Cycling element then obtains the luminance information of short exposure frames, goes to height for exposing frame using composograph as long
Bright computing unit.
Among the above, the factor setup unit, for set synthetic weight the lower limit factor value as 0；The factor
Determination unit, for according to it is listed in Table judgement and calculate determining upper limit factor value:
Among the above, in the threshold value determination unit, pixel intensity range is 0-255；Threshold value determination unit, for by with
Under type obtains upper limit threshold and lower threshold,
S51 lower threshold) is set as 50-76；
S52) upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames).
Among the above, the highlighted computing unit is more than for being calculated in long exposure frame image according to setting luminance threshold
The pixel accounting of luminance threshold, and accounting is at least multiplied 1000 and obtains the high bright part specific gravity, it is single then to go to factor setting
Member；The maximum value of the upper limit factor is 1000.
The invention further relates to a kind of image synthesizer for monitoring wide dynamic camera, including step,
Acquiring unit is synthesized, for obtaining the quantity of required image synthesis, goes to acquiring unit；
Acquiring unit goes to highlighted computing unit for obtaining the luminance information for obtaining image；
Highlighted computing unit goes to factor setup unit for calculating high bright part specific gravity in long exposure frame image；
Factor setup unit, the value of the lower limit factor for setting synthetic weight, goes to factor specifying unit；
Factor specifying unit, the value of the upper limit factor for determining synthetic weight according to high bright part specific gravity, goes to threshold
It is worth determination unit；
Threshold value determination unit, for obtaining the upper limit threshold of synthetic weight according to the exposure ratio of long exposure frame and short exposure frames
With lower threshold, synthetic weight determination unit is gone to；The upper limit threshold and lower threshold are located within the scope of pixel intensity, and on
It limits the corresponding pixel intensity of threshold value and is greater than the corresponding pixel intensity of lower threshold；
Synthetic weight determination unit, for the brightness to long exposure frame and the pixel of short exposure frames respectively with upper limit threshold,
Lower threshold carries out matching and determines respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold, goes to image composing unit,
The value of the synthetic weight capping factor, goes to image composing unit if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel between upper limit threshold, lower threshold, synthetic weight take by the corresponding upper limit of brightness because
The value on second order straight line that sub- value, lower limit factor value are constituted, goes to image composing unit；
Image composing unit, each pixel for composograph multiply respectively according to long exposure frame and short exposure frames respective pixel
It is obtained from after synthetic weight divided by the sum of respective weight, goes to synthesis and reduce unit；
Synthesis reduces unit, and the quantity for image synthesis subtracts 1, then goes to synthesis judging unit；
Judging unit is synthesized, for judging whether the quantity of image synthesis is greater than 1, composograph is otherwise exported, is, turn
To cycling element；
Cycling element then obtains the luminance information of short exposure frames, goes to height for exposing frame using composograph as long
Bright computing unit.
Effect of the invention, which is that, provides a kind of image composition method for monitoring wide dynamic camera, by real time
Every frame picture synthetic weight shared in synthesis is modified, the optimization of whole video pictures is reached, it is existing to avoid and reduce pseudo- gray scale
The influence of elephant.
It should be noted that this programme is suitable for the double frame synthesis of image.In the synthesis of double frames, for synthesizing two field pictures often
Wherein a frame is long exposure, and next frame is short exposure.As it can be seen that by using the method for the present invention, for long exposure frame in image
In synthesis process, if the synthetic weight of the pixel of different brightness is all maximum, synthesizes the whole pixel of meeting and take long exposure
(if doing normalized to before and after frames synthetic weight, specific gravity is smaller after the bigger processing of weighted value, can take at this time for light frame data
Short exposure frames data) short exposure frames data, the picture that output is exactly short exposure is synthesized in this way, high bright part rationally exposes, other
Region owes to expose, and whole image arranges partially dark.Conversely, whole points takes short exposure when the pixel synthetic weight of different brightness is all 0
Light frame data (just on the contrary, long exposure frame data can be taken in the case of same normalized).Synthesis output is exactly long expose in this way
The picture of light, dark place rationally expose, part overexposure at two.General image overexposure.
As it can be seen that there is weight, it is also necessary to which the synthesis of high effect can be realized by carrying out effective controlling party to synthetic weight, thus
Present invention control is as follows:
1, according to brightness value difference, different pixels uses different weight distributions, and dark place more exposes frame using long,
Namely synthetic weight is smaller.And bright place more uses short exposure frames, synthetic weight is larger.
2, for the scene of different light and shades difference ratio, need to modify the strategy of distribution.When high bright part specific gravity is high
It waits.The valid data of short exposure frames are opposite to be increased, and needs synthetic weight more to tilt toward short exposure, that is, the synthesis of more points
Weight will increase, this ensure that high bright part only exposes after synthesis, guarantee wide dynamic effect.
3, when high bright part specific gravity is lesser.Opposite processing is done with regard to needs and upper surface treatment, synthetic weight is more
Toward long exposure inclination, the synthetic weight of high bright part can not be excessive, needs to reduce accordingly, smaller according to ratio, weight is got over
Small, here if weight is excessive, composograph will have an impact the pseudo- gray scale phenomenon of picture quality in light and shade junction section, this
What a phenomenon was to try to avoid during processing.
Embodiment 4
Among the above, the factor setup unit, for set synthetic weight the lower limit factor value as 0；The factor
Determination unit, for according to it is listed in Table judgement and calculate determining upper limit factor value:
It is 0 calculation amount that can significantly simplify synthesis process by the value of the lower limit factor in the present embodiment.And in the upper limit factor
In the design mechanism of value, when the part that long exposure frame image is more than 20% is highlighted, then a excessive possibility row of overall exposing
Greatly, therefore the upper limit factor of maximum value is selected, reduces it in the weight of front and back two field pictures and load-bearing, reduces the region due to overexposure
To final synthesis bring puppet gradation effect.
Embodiment 5
Among the above, in the threshold value determination unit, pixel intensity range is 0-255；Threshold value determination unit, for by with
Under type obtains upper limit threshold and lower threshold,
S51 lower threshold) is set as 50-76；
S52) upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames).
In the present embodiment, by fixed lower threshold, then the mode of calculating upper limit threshold value makes processing and calculating process
It is highly efficient.And the setting of lower threshold volume is selected after inventor's many experiments, when pixel intensity range is in 0-255
When, lower threshold setting is best in brightness overall range totality 20%-30% effect.
Embodiment 6
Among the above, the highlighted computing unit is more than for being calculated in long exposure frame image according to setting luminance threshold
The pixel accounting of luminance threshold, and accounting is at least multiplied 1000 and obtains the high bright part specific gravity, it is single then to go to factor setting
Member；The maximum value of the upper limit factor is 1000.
In the present embodiment, integer is converted into the accounting (decimal point or percentage) calculated first, can be improved subsequent
Computational efficiency.This exterior multiplication can further be finely divided high bright part specific gravity, in the value for being greater than 1000 to increase subsequent weight
The precision of calculating.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of image composition method for monitoring wide dynamic camera, it is characterised in that: including step,
S1 the luminance information of image) is obtained；
S2 high bright part specific gravity in long exposure frame image) is calculated；
S3 the value of the lower limit factor of synthetic weight) is set；
S4 the value of the upper limit factor of synthetic weight) is determined according to high bright part specific gravity；
S5 the upper limit threshold and lower threshold of synthetic weight) are obtained according to the exposure ratio of long exposure frame and short exposure frames；On described
Limit threshold value and lower threshold are located within the scope of pixel intensity, and the corresponding pixel intensity of upper limit threshold is corresponding greater than lower threshold
Pixel intensity；
The pixel intensity range is 0-255；The lower threshold is obtained by setting；
The upper limit threshold is obtained by formula, upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames)；
The exposure of the long exposure frame and short exposure frames is than for long exposure the ratio between frame and the shutter speed of short exposure frames；
S6) long exposure frame is carried out matching respectively with upper limit threshold, lower threshold with the brightness of the pixel of short exposure frames and is determined respectively
From synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold,
The value of the synthetic weight capping factor if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel, between upper limit threshold, lower threshold, synthetic weight takes to be taken by the corresponding upper limit factor of brightness
The value on second order straight line that value, lower limit factor value are constituted；
S7) image synthesizes, and each pixel of image synthesis multiplies respectively synthesis according to long exposure frame and short exposure frames respective pixel and weighs
It is obtained after weight divided by the sum of respective weight.
2. a kind of image composition method for monitoring wide dynamic camera, it is characterised in that: including step,
S0 the quantity of the synthesis of image needed for) obtaining；
S1 the luminance information of image) is obtained；
S2 high bright part specific gravity in long exposure frame image) is calculated；
S3 the value of the lower limit factor of synthetic weight) is set；
S4 the value of the upper limit factor of synthetic weight) is determined according to high bright part specific gravity；
S5 the upper limit threshold and lower threshold of synthetic weight) are obtained according to the exposure ratio of long exposure frame and short exposure frames；On described
Limit threshold value and lower threshold are located within the scope of pixel intensity, and the corresponding pixel intensity of upper limit threshold is corresponding greater than lower threshold
Pixel intensity；
The pixel intensity range is 0-255；The lower threshold is obtained by setting；
The upper limit threshold is obtained by formula, upper limit threshold=240+2* (the exposure ratio -8 of long exposure frame and short exposure frames)；
The exposure of the long exposure frame and short exposure frames is than for long exposure the ratio between frame and the shutter speed of short exposure frames；
S6) long exposure frame is carried out matching respectively with upper limit threshold, lower threshold with the brightness of the pixel of short exposure frames and is determined respectively
From synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold,
The value of the synthetic weight capping factor if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel, between upper limit threshold, lower threshold, synthetic weight takes to be taken by the corresponding upper limit factor of brightness
The value on second order straight line that value, lower limit factor value are constituted；
S8) composograph, each pixel of composograph multiply respectively synthesis according to long exposure frame and short exposure frames respective pixel and weigh
It is obtained after weight divided by the sum of respective weight；
S9) quantity of image synthesis subtracts 1；
S10) judge whether the quantity of image synthesis is greater than 1, otherwise export composograph, be, go to step S11；
S11 frame) is exposed using composograph as long, the luminance information of short exposure frames is then obtained, goes back to step S2.
3. the image composition method as claimed in claim 1 or 2 for monitoring wide dynamic camera, it is characterised in that: the step
In S3, the value of the lower limit factor of synthetic weight is set as 0；In the step S4, according to judgement listed in Table and determination is calculated
Upper limit factor value:
4. the image composition method as claimed in claim 1 or 2 for monitoring wide dynamic camera, it is characterised in that: the step
Lower threshold is set in S5 as 50-76.
5. the image composition method as claimed in claim 1 or 2 for monitoring wide dynamic camera, it is characterised in that: the step
In S2, the pixel accounting in long exposure frame image more than luminance threshold is calculated according to setting luminance threshold, and at least by accounting
Multiply 1000 and obtains the high bright part specific gravity；The maximum value of the upper limit factor is 1000.
6. a kind of image synthesizer for monitoring wide dynamic camera, it is characterised in that: including,
Acquiring unit goes to highlighted computing unit for obtaining the luminance information of image；
Highlighted computing unit goes to factor setup unit for calculating high bright part specific gravity in long exposure frame image；
Factor setup unit, the value of the lower limit factor for setting synthetic weight, goes to factor specifying unit；
Factor specifying unit, the value of the upper limit factor for determining synthetic weight according to high bright part specific gravity, it is true to go to threshold value
Order member；
Threshold value determination unit, for the exposure according to long exposure frame and short exposure frames than obtaining the upper limit threshold of synthetic weight under
Threshold value is limited, synthetic weight determination unit is gone to；The upper limit threshold and lower threshold are located within the scope of pixel intensity, and upper limit threshold
It is worth corresponding pixel intensity greater than the corresponding pixel intensity of lower threshold；The pixel intensity range is 0-255；The lower limit threshold
Value is obtained by setting；The upper limit threshold passes through the formula, (exposure of long exposure frame and short exposure frames of upper limit threshold=240+2*
Than -8) it obtains；The exposure of the long exposure frame and short exposure frames is than for long exposure the ratio between frame and the shutter speed of short exposure frames；
Synthetic weight determination unit, for the brightness to long exposure frame and the pixel of short exposure frames respectively with upper limit threshold, lower limit
Threshold value carries out matching and determines respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold, goes to image composing unit,
The value of the synthetic weight capping factor, goes to image composing unit if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel, between upper limit threshold, lower threshold, synthetic weight takes to be taken by the corresponding upper limit factor of brightness
The value on second order straight line that value, lower limit factor value are constituted, goes to image composing unit；
Image composing unit, each pixel for image synthesis multiply respective conjunction according to long exposure frame and short exposure frames respective pixel
It is obtained at after weight divided by the sum of respective weight.
7. a kind of image synthesizer for monitoring wide dynamic camera, it is characterised in that: including,
Acquiring unit is synthesized, for obtaining the quantity of required image synthesis, goes to acquiring unit；
Acquiring unit goes to highlighted computing unit for obtaining the luminance information of image；
Highlighted computing unit goes to factor setup unit for calculating high bright part specific gravity in long exposure frame image；
Factor setup unit, the value of the lower limit factor for setting synthetic weight, goes to factor specifying unit；
Factor specifying unit, the value of the upper limit factor for determining synthetic weight according to high bright part specific gravity, it is true to go to threshold value
Order member；
Threshold value determination unit, for the exposure according to long exposure frame and short exposure frames than obtaining the upper limit threshold of synthetic weight under
Threshold value is limited, synthetic weight determination unit is gone to；The upper limit threshold and lower threshold are located within the scope of pixel intensity, and upper limit threshold
It is worth corresponding pixel intensity greater than the corresponding pixel intensity of lower threshold；The pixel intensity range is 0-255；The lower limit threshold
Value is obtained by setting；The upper limit threshold passes through the formula, (exposure of long exposure frame and short exposure frames of upper limit threshold=240+2*
Than -8) it obtains；The exposure of the long exposure frame and short exposure frames is than for long exposure the ratio between frame and the shutter speed of short exposure frames；
Synthetic weight determination unit, for the brightness to long exposure frame and the pixel of short exposure frames respectively with upper limit threshold, lower limit
Threshold value carries out matching and determines respective synthetic weight,
Synthetic weight removes the limit the value of the factor if the brightness of pixel is less than lower threshold, goes to image composing unit,
The value of the synthetic weight capping factor, goes to image composing unit if the brightness of pixel is greater than upper limit threshold,
If the brightness of pixel, between upper limit threshold, lower threshold, synthetic weight takes to be taken by the corresponding upper limit factor of brightness
The value on second order straight line that value, lower limit factor value are constituted, goes to image composing unit；
Image composing unit, each pixel for composograph multiply respective conjunction according to long exposure frame and short exposure frames respective pixel
It is obtained at after weight divided by the sum of respective weight, goes to synthesis and reduce unit；
Synthesis reduces unit, and the quantity for image synthesis subtracts 1, then goes to synthesis judging unit；
Judging unit is synthesized, for judging whether the quantity of image synthesis is greater than 1, composograph is otherwise exported, is, go to and follow
Ring element；
Cycling element then obtains the luminance information of short exposure frames, goes to highlighted meter for exposing frame using composograph as long
Calculate unit.
8. the image synthesizer of the wide dynamic camera of monitoring as claimed in claims 6 or 7, it is characterised in that: the factor
Setup unit, for set synthetic weight the lower limit factor value as 0；The factor specifying unit, for according to following table institute
Column judge and calculate determining upper limit factor value:
9. the image synthesizer of the wide dynamic camera of monitoring as claimed in claims 6 or 7, it is characterised in that: the threshold value
In determination unit, lower threshold is set as 50-76.
10. the image synthesizer of the wide dynamic camera of monitoring as claimed in claims 6 or 7, it is characterised in that: described highlighted
Computing unit, for calculating the pixel accounting in long exposure frame image more than luminance threshold according to setting luminance threshold, and will
Accounting at least multiplies 1000 and obtains the high bright part specific gravity, then goes to factor setup unit；The maximum of the upper limit factor takes
Value is 1000.
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| CN110248108B (en) * | 2019-06-14 | 2020-11-06 | 浙江大华技术股份有限公司 | Exposure adjustment and dynamic range determination method under wide dynamic state and related device |
| CN111083390B (en) * | 2019-12-27 | 2021-07-06 | 维沃移动通信有限公司 | Image processing method and electronic equipment |
| CN111526298B (en) * | 2020-03-24 | 2021-10-19 | 深圳英飞拓智能技术有限公司 | Method for improving wide dynamic multi-scene adaptability |
| CN111654638B (en) * | 2020-04-30 | 2021-09-07 | 深圳英飞拓智能技术有限公司 | Method and device for adjusting wide dynamic imaging exposure of camera |
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