CN105872509A - Image contrast adjustment method and device - Google Patents
Image contrast adjustment method and device Download PDFInfo
- Publication number
- CN105872509A CN105872509A CN201510821196.5A CN201510821196A CN105872509A CN 105872509 A CN105872509 A CN 105872509A CN 201510821196 A CN201510821196 A CN 201510821196A CN 105872509 A CN105872509 A CN 105872509A
- Authority
- CN
- China
- Prior art keywords
- image
- sample point
- foreground image
- foreground
- play amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/643—Hue control means, e.g. flesh tone control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/485—End-user interface for client configuration
- H04N21/4854—End-user interface for client configuration for modifying image parameters, e.g. image brightness, contrast
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Processing Or Creating Images (AREA)
Abstract
The embodiment of the invention provides an image contrast adjustment method and device. The device comprises a foreground image processing circuit for obtaining a foreground image of a current frame of video, obtaining chroma offsets of different colors at each sample point in the foreground image, and normalizing the chroma offsets of different colors at each sample point, thus generating a processed foreground image; a background image processing circuit for obtaining a background image of the current frame of video, and carrying out grain processing to the background image, thus generating the processed background image; and an image output circuit for superimposing the processed background image and the processed foreground image, and outputting the final image with adjusted color contrast. Through adoption of the technical scheme provided by the embodiment of the invention, the foreground image and the background image are processed respectively, the color distortion problem resulting from modifying the transparency of the foreground image is avoided, and the displaying effect of the image with adjusted color contrast is improved.
Description
Technical field
The present embodiments relate to graph and image processing field, particularly relate to a kind of picture contrast control method
And device.
Background technology
Along with developing rapidly of electronic technology, user can pass through various electronic equipments (such as personal computer,
Mobile phone, panel computer etc.) viewing video, browsing pictures etc..
Owing to everyone is different to the perception degree of image color, therefore, user during viewing video,
The demand adjusting picture contrast can be there is.At present, various electronic equipments are generally by adjusting foreground image
The method of transparency, adjusts picture contrast.
Concrete, each frame video in video flowing is an image, all comprises prospect in each image
Image and background image；When user needs the color contrast of image is become big, though the color contrast of image
Time distincter, electronic equipment is by reducing the transparency of foreground image, it is achieved increase the color pair of image
Degree of ratio；Accordingly, when user needs to diminish the color contrast of image, though the color contrast of image
Time less distinct, electronic equipment is by improving the transparency of foreground image, it is achieved reduce the color of image
Contrast.Use technique scheme, it is achieved during the adjustment of picture contrast, although adjust process the fastest
Victory, but only by adjusting the transparency of foreground image, it is achieved the adjustment of picture contrast, there is image pair
After adjusting than degree, cause color of image distortion, the problem that image display effect is the best.
As can be seen here, at present during the color contrast adjustment to video image, there is Adjustment effect poor
Problem.
Summary of the invention
The embodiment of the present invention provides a kind of picture contrast control method and device, in order to solve to video figure
During the color contrast of picture adjusts, the problem that there is Adjustment effect difference.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
The embodiment of the present invention provides a kind of picture contrast control method, including:
Obtain the foreground image of present frame video, and obtain the face of each sample point in described foreground image
Colour saturation side-play amount, and respectively the color depth side-play amount of each sample point is normalized, raw
Foreground image after one-tenth process；
Obtain the background image of described present frame video, and described background image is carried out gain process, generate
Background image after process；
Background image after described process and the foreground image after described process are overlapped, and export color
Final image after setting contrast.
The embodiment of the present invention provides a kind of picture contrast adjusting means, including:
Foreground image processes circuit, for obtaining the foreground image of present frame video, and obtains described foreground picture
The color depth side-play amount of each sample point in Xiang, and inclined to the color depth of each sample point respectively
Shifting amount is normalized, the foreground image after generation process；
Background image processes circuit, for obtaining the background image of described present frame video, and to described background
Image carries out gain process, the background image after generation process；
Image output circuit, processes circuit with described foreground image respectively and described background image processes circuit
Connect, for the background image after described process and the foreground image after described process are overlapped and defeated
Go out the final image after color contrast adjusts.
The embodiment of the present invention provides a kind of picture contrast control method and device, wraps and is regarded by acquisition present frame
The foreground image of frequency, and obtain the color depth side-play amount of each sample point in described foreground image, with
And the color depth side-play amount of each sample point is normalized, the foreground image after generation process；
Obtaining the background image of described present frame video, and described background image carries out gain process, generation processes
After background image；Background image after described process and the foreground image after described process are overlapped,
And export the final image after color contrast adjusts.Use embodiment of the present invention technical scheme, by respectively
Foreground image and background image are processed, it is to avoid the only transparency to foreground image is changed causing
The problem such as cross-color；Further, by the concentration excursion amount of the different color of foreground image, image is adjusted
Color contrast, it is possible to ensure color contrast adjust after the color of image full abundant, improve face
The display effect of the image after color contrast adjustment.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, retouch below
Accompanying drawing in stating is some embodiments of the present invention, for those of ordinary skill in the art, is not paying
On the premise of creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is picture contrast control method flow chart in the embodiment of the present invention one；
Fig. 2 is picture contrast adjusting means structural representation in；
Fig. 3 is picture contrast adjusting means structural representation in the embodiment of the present invention two；
Fig. 4 a is coordinate diagram one in the embodiment of the present invention two；
Fig. 4 b is coordinate diagram two in the embodiment of the present invention two；
Fig. 5 is picture contrast adjusting apparatus structural representation in the embodiment of the present invention three；
Fig. 6 is picture contrast adjusting apparatus structural representation in the embodiment of the present invention four；
Fig. 7 is picture contrast adjusting apparatus structural representation in the embodiment of the present invention five.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that
Described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of protection of the invention.
In the embodiment of the present invention, this picture contrast method of adjustment can apply to terminal plays video process
In, the application scenarios that video image is adjusted, described terminal can be intelligent television, personal computer,
Mobile phone, panel computer etc., the operating system loaded in described terminal can be Windows operating system, peace
Tall and erect operating system, or ios operating system etc..
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
Embodiment one
Refering to shown in Fig. 1, in the embodiment of the present invention, regulate the process of picture contrast, including:
Step 100: obtain the foreground image of present frame video, and obtain each in described foreground image
The color depth side-play amount of sample point, and respectively the color depth side-play amount of each sample point is carried out normalizing
Change processes, the foreground image after generation process.
In the embodiment of the present invention, terminal obtains currently playing video flowing, and gathers every from described video flowing
The image of one frame, the image of this each frame is the object of image adjustment.
Optionally, terminal uses interframe to insert a point method, or uses binocular vision away from image-forming principle from present frame figure
Foreground image and background image is distinguished in Xiang.
The color depth side-play amount of each sample point in the described foreground image of described acquisition, specifically includes:
Obtain the foreground image of current frame video image, and described current foreground image is processed, generate described
The foreground key signal that current foreground image is corresponding；The first sample point is gathered respectively from described foreground key signal, with
And gather the second sample point from the video template chosen in advance, for every in described foreground image and video template
The first sample point in one same position and the second sample point, be performed both by operating as follows: relatively described first
The brightness value of sample point and the brightness value of described second sample point, from described first sample point and described second sample
This point is chosen the sample point that brightness value is maximum, obtains the color depth side-play amount of described sample point；Wherein,
Described color depth side-play amount comprises red-color concentration side-play amount and blue intensity side-play amount；
Respectively the color depth side-play amount of each sample point is normalized, the prospect after generation process
Image, specifically includes: for the color depth side-play amount of each sample point, is performed both by operating as follows: root
According to default expectation key color, red-color concentration side-play amount and blue intensity side-play amount to this sample point are entered respectively
Row normalized, wherein, described expectation key color is the color parameter being expected to be set to of this sample point；
The wound of the blue intensity side-play amount after the red-color concentration side-play amount after process and normalized is changed according to normalization
Build coordinate diagram, this coordinate diagram represent the most respectively the blue intensity side-play amount after normalized and
Red-color concentration side-play amount after normalized；By the horizontally and vertically rotation predetermined angle of described coordinate diagram,
Generate the first coordinate transforming axle and the second coordinate transforming axle；Inclined according to the red-color concentration after described normalized
Blue intensity side-play amount after shifting amount and normalized, obtain that described first coordinate transforming axle is corresponding first
Data, and the second data that described second coordinate transforming axle is corresponding；According to described first data and described
Two data, obtain the acceptance angle that this sample point is corresponding；Wherein, described acceptance angle is for being used for characterizing this sample point
Described in the boundary angle of the amplitude of the foreground key signal part linearly increasing with the increase of saturation；According to
Described acceptance angle, obtains the first foreground image comprised in described foreground image；Wherein, described first prospect
Image is to be positioned at the part within described acceptance angle in described sample point；According to described foreground key signal, by institute
State the first foreground image colouring information to process, the foreground image after generation process.
Further, terminal, according to described acceptance angle, obtains the second foreground picture comprised in described foreground image
Picture: wherein, described second foreground image is to be positioned at the part beyond described acceptance angle in described sample point；Right
Described second foreground image carries out gain process.
Step 110: obtain the background image of described present frame video, and described background image is carried out gain
Process, the background image after generation process.
In the embodiment of the present invention, optionally, by multiplier, described background image is processed, and pass through
Background image after processing and the background image gain preset are processed by multiplier, the back of the body after generation process
Scape image；Wherein, described background image gain be in conventional images color amplitude basis color add agriculture.
Step 120: the background image after described process and the foreground image after described process are overlapped,
And export the final image after color contrast adjusts.
In the embodiment of the present invention, to process after the first foreground image, the second foreground image after process, with
And the background image after described process is overlapped.
Embodiment two
Refering to shown in Fig. 2, for picture contrast adjusting apparatus in the embodiment of the present invention；Described picture contrast
Adjusting apparatus includes that foreground image processes circuit 10, and background image processes circuit 20, and image output electricity
Road 30；Wherein:
Described foreground image processes circuit 10, for obtaining the foreground image of present frame video, and obtains described
The color depth side-play amount of each sample point in foreground image, and color to each sample point respectively
Concentration excursion amount is normalized, the foreground image after generation process；
Background image processes circuit 20, for obtaining the background image of described present frame video, and to the described back of the body
Scape image carries out gain process, the background image after generation process；
Image output circuit 30, processes at circuit 10 and described background image with described foreground image respectively
Reason circuit 20 connects, for the background image after described process and the foreground image after described process being carried out
Superposition, and export the final image after color contrast adjusts.
Optionally, described background image processes circuit 20 is multiplier.Concrete, described multiplier is to institute
State background image and the background image gain preset processes, the background image after generation process；Wherein,
Described background image gain be in conventional images color amplitude basis color add agriculture.
Optionally, described image output circuit 30 comprises adder, described adder respectively with described prospect
Image processing circuit and described background image process circuit and connect, and are used for: to the Background after described process
Foreground image after picture and described process is overlapped.
Use embodiment of the present invention technical scheme, by foreground image process circuit to foreground image at
Reason, and by background image process circuit, background image is processed, the most right by different circuit
Foreground image and background image process, it is to avoid the only transparency to foreground image is changed causing
The problems such as cross-color；Further, by the concentration excursion amount of the different color of foreground image, image is adjusted
Color contrast, it is possible to ensure that the color of the image after color contrast adjustment is full abundant, improve color
The display effect of the image after setting contrast.
Embodiment two
Refering to shown in Fig. 3, for picture contrast adjusting apparatus in the embodiment of the present invention；Described picture contrast
Adjusting apparatus includes that foreground image processes circuit 10, and background image processes circuit 20, and image output electricity
Road 30；Wherein:
Described foreground image processes circuit and includes key maker 101, non additivity blender 102, and prospect is compressed
Device 103, and key processor 104；Wherein:
Described key maker 101, for obtaining the foreground image of current frame video image, and to described currently
Foreground image processes, and generates the foreground key signal (KFG) that described current foreground image is corresponding；Wherein,
Described foreground key signal is for characterizing the element information comprised in described foreground image；
Described non additivity blender 102, is connected with described key maker 101, is used for receiving described key and generates
The foreground key signal that device 101 sends, and gather the first sample point, Yi Jicong from described foreground key signal respectively
The video template chosen in advance gathers the second sample point, and wherein, described video template is in video flowing, arbitrarily
One two field picture；First sample point and the second sample point are according to preset rules, respectively from foreground image and video
The pixel chosen in template；The position of described first sample point is identical with the position of described second sample point,
And first the quantity of sample point identical with the quantity of the second sample point, described quantity is the most multiple；For institute
The first sample point stated in foreground image and video template in each same position and the second sample point, all hold
The following operation of row: compare brightness value and the brightness value of described second sample point of described first sample point, from institute
State and the first sample point and described second sample point are chosen the sample point that brightness value is maximum, obtain described sample point
Red-color concentration side-play amount (being designated as Cr) and blue intensity side-play amount (being designated as Cb)；Such as, the first sample
Point is for be positioned at the pixel of the first row first row in foreground image, and same, the second sample point is for being positioned at video
The pixel of the first row first row in template, obtains the brightness value (being designated as a) of the first sample point, and second
The brightness value (being designated as b) of sample point, as a ＞ b, obtains Cr and Cb of the first sample point；
Prospect compressor 103, is connected with described non additivity blender 102, for for each sample point
Red-color concentration side-play amount and blue intensity side-play amount, be performed both by operating as follows: according to default expectation key face
Color, red-color concentration side-play amount and blue intensity side-play amount to this sample point be normalized respectively, its
In, described expectation key color is the color parameter being expected to be set to of this sample point；And change according to normalization
Red-color concentration side-play amount after process and the blue intensity side-play amount after normalized create coordinate diagram and (refer to
Shown in Fig. 4 a), the blue intensity side-play amount after the normalized of expression the most respectively of this coordinate diagram
Red-color concentration side-play amount (being designated as Cr ') after (being designated as Cb ') and normalized；By described coordinate diagram
Horizontally and vertically rotate predetermined angle (being designated as θ), generate the first coordinate transforming axle (being designated as X) and second and become
Change coordinate axes (being designated as Z), refering to shown in Fig. 4 a；According to described Cr ' and Cb ', obtain described first and become
Change the first data that coordinate axes is corresponding, and the second data that described second coordinate transforming axle is corresponding；According to institute
State the first data and described second data, obtain acceptance angle corresponding to this sample point (being designated as α)；Wherein,
Refering to shown in Fig. 4 b, described acceptance angle is for characterizing in this sample point foreground key signal with the increasing of saturation
Add and the boundary angle of linearly increasing part；
Key processor 104, is connected with described prospect compressor 103, is used for according to described foreground key signal,
The the first foreground image colouring information exported by described prospect compressor 103 processes, after generation processes
Foreground image；Wherein, described first foreground image is to be positioned at the portion within described acceptance angle in described sample point
Point.
Wherein, owing to Cr ' and Cb ' is the parameter after normalized, therefore, Cr ' and Cb '
Span be [-1,1].
Optionally, refering to shown in Fig. 4 a, Cr ' and Cb ' represents the longitudinal axis and transverse axis respectively, described transverse axis and
In the coordinate system of longitudinal axis composition, zones of different represents different colors；After described coordinate system anglec of rotation θ,
X-axis and the coordinate system of Z axis composition will be generated；The initial value of this θ can be arranged as the case may be by user,
Can change according to the mode of the preset value that successively decreases successively, it is also preferred that the left the value of this θ is for making X-axis pass expectation
Key color.
Wherein, the value that described X-axis is corresponding can use equation below to obtain:
X=Cb'cos θ+Cr'sin θ formula one
The value that described Z axis is corresponding can use equation below to obtain:
Z=Cr'cos θ-Cb'sin θ formula two
Owing to the span of Cr ' and Cb ' is [-1,1], therefore, the span of x and z is [0,1].
Further, obtain according to equation below due to KFG:
As KFG=0, the angle value obtained is acceptance angle.
The acceptance angle obtained is divided equally by X-axis, and this acceptance angle constitutes a scope, at the model of acceptance angle composition
The amplitude of the KFG enclosing interior sample point is linearly increasing with the increase of saturation, by acceptance angle compositing range
Sample point composition foreground image be referred to as the first foreground image；Outside the scope of acceptance angle composition, sample point
KFG=0, by outside acceptance angle compositing range sample point form foreground image become the second foreground image.
Optionally, described key processor 104 by equation below to the first foreground image colouring information at
Reason, the foreground image after generation process:
X '=x-KFG formula four
Optionally, the second foreground image can not be processed, directly be overlapped with the first foreground image.
Optionally, described background image processes circuit 20 is multiplier 201 and multiplier 202.Concrete,
Described background image is processed by described multiplier 201, and described multiplier 202 is to the Background after processing
Picture and the background image gain preset process, the background image after generation process；Wherein, described background
Image gain be in conventional images color amplitude basis color add agriculture.
Optionally, described image output circuit 30 comprises adder, described adder respectively with described prospect
Image processing circuit and described background image process circuit and connect, and are used for: to the Background after described process
Foreground image after picture and described process is overlapped.
Concrete, described adder, specifically for: to the first foreground image after processing, the after process
Background image after two foreground images, and process is overlapped.
Use embodiment of the present invention technical scheme, owing to the red-color concentration side-play amount in foreground image and blueness are dense
Degree side-play amount is for strengthening the point of brightness in foreground image, therefore, by red-color concentration in foreground image
Side-play amount and the process of blue intensity side-play amount, it is possible to improve the brightness of image of foreground image；Further, pass through
Background image is carried out gain process, it is possible to improve the brightness of image of background image, thus adjust the face of image
Color contrast, it is possible to ensure that the color of the image after color contrast adjustment is full abundant, improve color pair
The display effect of the image after adjusting than degree.
Embodiment three
Refering to shown in Fig. 5, for picture contrast adjusting apparatus in the embodiment of the present invention；Described picture contrast
Adjusting apparatus includes that foreground image processes circuit 10, and background image processes circuit 20, and image output electricity
Road 30；Wherein:
Described foreground image processes circuit and includes key maker 101, non additivity blender 102, and prospect is compressed
Device 103, and key processor 104, multiplier 105；Wherein:
Described key maker 101, for obtaining the foreground image of current frame video image, and to described currently
Foreground image processes, and generates the foreground key signal (KFG) that described current foreground image is corresponding；Wherein,
Described foreground key signal is for characterizing the element information comprised in described foreground image；
Described non additivity blender 102, is connected with described key maker 101, is used for receiving described key and generates
The foreground key signal that device 101 sends, and gather the first sample point, Yi Jicong from described foreground key signal respectively
The video template chosen in advance gathers the second sample point, and wherein, described video template is in video flowing, arbitrarily
One two field picture；First sample point and the second sample point are according to preset rules, respectively from foreground image and video
The pixel chosen in template；The position of described first sample point is identical with the position of described second sample point,
And first the quantity of sample point identical with the quantity of the second sample point, described quantity is the most multiple；For institute
The first sample point stated in foreground image and video template in each same position and the second sample point, all hold
The following operation of row: compare brightness value and the brightness value of described second sample point of described first sample point, from institute
State and the first sample point and described second sample point are chosen the sample point that brightness value is maximum, obtain described sample point
Red-color concentration side-play amount (being designated as Cr) and blue intensity side-play amount (being designated as Cb)；Such as, the first sample
Point is for be positioned at the pixel of the first row first row in foreground image, and same, the second sample point is for being positioned at video
The pixel of the first row first row in template, obtains the brightness value (being designated as a) of the first sample point, and second
The brightness value (being designated as b) of sample point, as a ＞ b, obtains Cr and Cb of the first sample point；
Prospect compressor 103, is connected with described non additivity blender 102, for for each sample point
Red-color concentration side-play amount and blue intensity side-play amount, be performed both by operating as follows: according to default expectation key face
Color, red-color concentration side-play amount and blue intensity side-play amount to this sample point be normalized respectively, its
In, described expectation key color is the color parameter being expected to be set to of this sample point；And change according to normalization
Red-color concentration side-play amount after process and the blue intensity side-play amount after normalized create coordinate diagram and (refer to
Shown in Fig. 4 a), the blue intensity side-play amount after the normalized of expression the most respectively of this coordinate diagram
Red-color concentration side-play amount (being designated as Cr ') after (being designated as Cb ') and normalized；By described coordinate diagram
Horizontally and vertically rotate predetermined angle (being designated as θ), generate the first coordinate transforming axle (being designated as X) and second and become
Change coordinate axes (being designated as Z), refering to shown in Fig. 4 a；According to described Cr ' and Cb ', obtain described first and become
Change the first data that coordinate axes is corresponding, and the second data that described second coordinate transforming axle is corresponding；According to institute
State the first data and described second data, obtain acceptance angle corresponding to this sample point (being designated as α)；Wherein,
Refering to shown in Fig. 4 b, described acceptance angle is for characterizing in this sample point foreground key signal with the increasing of saturation
Add and the boundary angle of linearly increasing part；
Key processor 104, is connected with described prospect compressor 103, is used for according to described foreground key signal,
The the first foreground image colouring information exported by described prospect compressor 103 processes, after generation processes
Foreground image；Wherein, described first foreground image is to be positioned at the portion within described acceptance angle in described sample point
Point.
Wherein, owing to Cr ' and Cb ' is the parameter after normalized, therefore, Cr ' and Cb '
Span be [-1,1].
Optionally, refering to shown in Fig. 4 a, Cr ' and Cb ' represents the longitudinal axis and transverse axis respectively, described transverse axis and
In the coordinate system of longitudinal axis composition, zones of different represents different colors；After described coordinate system anglec of rotation θ,
X-axis and the coordinate system of Z axis composition will be generated；The initial value of this θ can be arranged as the case may be by user,
Can change according to the mode of the preset value that successively decreases successively, it is also preferred that the left the value of this θ is for making X-axis pass expectation
Key color.
Wherein, the value that described X-axis is corresponding can use formula one acquisition；The value that described Z axis is corresponding is permissible
Formula two is used to obtain；The span of x and z is [0,1].
Further, KFG obtains according to formula three；As KFG=0, the angle value obtained is acceptance
Angle.
The acceptance angle obtained is divided equally by X-axis, and this acceptance angle constitutes a scope, at the model of acceptance angle composition
The amplitude of the KFG enclosing interior sample point is linearly increasing with the increase of saturation, by acceptance angle compositing range
Sample point composition foreground image be referred to as the first foreground image；Outside the scope of acceptance angle composition, sample point
KFG=0, by outside acceptance angle compositing range sample point form foreground image become the second foreground image.
Optionally, the first foreground image colouring information is processed by described key processor 104 by formula four,
Foreground image after generation process.
Optionally, by multiplier 105, default prospect gain and the second foreground image are processed.
Optionally, described background image processes circuit 20 is multiplier 201 and multiplier 202.Concrete,
Described background image is processed by described multiplier 201, and described multiplier 202 is to the Background after processing
Picture and the background image gain preset process, the background image after generation process；Wherein, described background
Image gain be in conventional images color amplitude basis color add agriculture.
Optionally, described image output circuit 30 comprises adder, described adder respectively with described prospect
Image processing circuit and described background image process circuit and connect, and are used for: to the Background after described process
Foreground image after picture and described process is overlapped.
Concrete, described adder, specifically for: to the first foreground image after processing, the after process
Background image after two foreground images, and process is overlapped.
Use embodiment of the present invention technical scheme, owing to the red-color concentration side-play amount in foreground image and blueness are dense
Degree side-play amount is for strengthening the point of brightness in foreground image, therefore, by red-color concentration in foreground image
Side-play amount and the process of blue intensity side-play amount, it is possible to improve the brightness of image of foreground image；Further, pass through
Background image is carried out gain process, it is possible to improve the brightness of image of background image, thus adjust the face of image
Color contrast, it is possible to ensure that the color of the image after color contrast adjustment is full abundant, improve color pair
The display effect of the image after adjusting than degree.
Embodiment four
Based on described embodiment one to embodiment three, refering to shown in Fig. 6, described picture contrast adjusting apparatus
Also including image splitter 40, described image splitter 40 processes circuit 10 with described foreground image respectively
Process circuit 20 with described background image to connect, be used for: from the image that present frame video is corresponding, separate
Obtain foreground image and background image.
Based on described embodiment one to embodiment three, refering to shown in Fig. 7, described picture contrast adjusting apparatus
Also include that image acquisition device 50, described image acquisition device 50 are connected with described image splitter 40, are used for:
Obtain video data, and obtain the image that in described video data, present frame video is corresponding.
In sum, in the embodiment of the present invention, it is provided that a kind of picture contrast adjusting apparatus, including prospect
Image processing circuit, background image processes circuit, and image output circuit；Wherein, described foreground picture
As processing circuit, for obtaining the foreground image of present frame video, and obtain in described foreground image every
The concentration excursion amount of the different colours of one sample point, and the concentration of the different colours to each sample point
Side-play amount is normalized, the foreground image after generation process；Background image processes circuit, is used for
Obtain the background image of described present frame video, and described background image is carried out gain process, at generation
Background image after reason；Image output circuit, processes circuit and the described back of the body with described foreground image respectively
Scape image processing circuit connects, for by the background image after described process and the foreground picture after described process
As being overlapped, and export the final image after color contrast adjusts.Use embodiment of the present invention technology
Scheme, is processed circuit by foreground image and processes foreground image, and processed by background image
Background image is processed by circuit, is carried out foreground image and background image respectively by different circuit
Process, it is to avoid the only transparency to foreground image is changed the problems such as the cross-color that causes；And
And, by the concentration excursion amount of the different color of foreground image, adjust the color contrast of image, it is possible to
Ensure that the color of the image after color contrast adjustment is full abundant, after improve color contrast adjustment
The display effect of image.
Device embodiment described above is only schematically, wherein said illustrates as separating component
Unit can be or may not be physically separate, the parts shown as unit can be or
Person may not be physical location, i.e. may be located at a place, or can also be distributed to multiple network
On unit.Some or all of module therein can be selected according to the actual needs to realize the present embodiment
The purpose of scheme.Those of ordinary skill in the art are not in the case of paying performing creative labour, the most permissible
Understand and implement.
Through the above description of the embodiments, those skilled in the art is it can be understood that arrive each reality
The mode of executing can add the mode of required general hardware platform by software and realize, naturally it is also possible to by firmly
Part.Based on such understanding, the portion that prior art is contributed by technique scheme the most in other words
Dividing and can embody with the form of software product, this computer software product can be stored in computer can
Read in storage medium, such as ROM/RAM, magnetic disc, CD etc., including some instructions with so that one
Computer equipment (can be personal computer, server, or the network equipment etc.) performs each embodiment
Or the method described in some part of embodiment.
Last it is noted that above example is only in order to illustrate the technical scheme of the embodiment of the present invention, rather than
It is limited；Although the embodiment of the present invention being described in detail with reference to previous embodiment, this area
Those of ordinary skill is it is understood that the technical scheme described in foregoing embodiments still can be repaiied by it
Change, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make phase
The essence answering technical scheme departs from the spirit and scope of the embodiment of the present invention each embodiment technical scheme.
Claims (12)
1. a picture contrast control method, it is characterised in that including:
Obtain the foreground image of present frame video, and obtain the face of each sample point in described foreground image
Colour saturation side-play amount, and respectively the color depth side-play amount of each sample point is normalized, raw
Foreground image after one-tenth process；
Obtain the background image of described present frame video, and described background image is carried out gain process, generate
Background image after process；
Background image after described process and the foreground image after described process are overlapped, and export color
Final image after setting contrast.
Method the most according to claim 1, it is characterised in that in the described foreground image of described acquisition
The color depth side-play amount of each sample point, and color depth side-play amount to each sample point respectively
It is normalized, the foreground image after generation process, specifically includes:
Obtain the foreground image of current frame video image, and described current foreground image is processed, generate
The foreground key signal that described current foreground image is corresponding；
The first sample point is gathered respectively from described foreground key signal, and from the video template collection chosen in advance
Second sample point, for the first sample point in each same position in described foreground image and video template
With the second sample point, it is performed both by operating as follows: compare the brightness value of described first sample point and described second sample
The brightness value of this point, chooses the sample that brightness value is maximum from described first sample point and described second sample point
Point, obtains the color depth side-play amount of described sample point；Wherein, described color depth side-play amount comprises redness
Concentration excursion amount and blue intensity side-play amount；
For the color depth side-play amount of each sample point, it is performed both by operating as follows: according to default expectation
Key color, red-color concentration side-play amount and blue intensity side-play amount to this sample point are normalized place respectively
Reason, wherein, described expectation key color is the color parameter being expected to be set to of this sample point；
The skew of the blue intensity after the red-color concentration side-play amount after process and normalized is changed according to normalization
Amount creates coordinate diagram, the blue intensity skew after the normalized of expression the most respectively of this coordinate diagram
Red-color concentration side-play amount after amount and normalized；
By the horizontally and vertically rotation predetermined angle of described coordinate diagram, generate the first coordinate transforming axle and second and become
Change coordinate axes；Dense according to the red-color concentration side-play amount after described normalized and the blueness after normalized
Degree side-play amount, obtains the first data that described first coordinate transforming axle is corresponding, and described second coordinate transforming
The second data that axle is corresponding；
According to described first data and described second data, obtain the acceptance angle that this sample point is corresponding；Wherein,
Described acceptance angle is for characterizing the amplitude of foreground key signal described in this sample point with the increase of saturation
The boundary angle of linearly increasing part；According to described acceptance angle, obtain comprised in described foreground image
One foreground image；Wherein, described first foreground image be described sample point is positioned at described acceptance angle within
Part；
According to described foreground key signal, being processed by described first foreground image colouring information, generation processes
After foreground image.
Method the most according to claim 2, it is characterised in that described method also includes:
According to described acceptance angle, obtain the second foreground image comprised in described foreground image: wherein, described
Second foreground image is to be positioned at the part beyond described acceptance angle in described sample point；
Described second foreground image is carried out gain process.
Method the most according to claim 3, it is characterised in that by the background image after described process
It is overlapped with the foreground image after described process, specifically includes:
To the first foreground image after processing, the second foreground image after process, and the back of the body after described process
Scape image is overlapped.
5. according to the method described in any one of claim 1-4, it is characterised in that obtain present frame video
Foreground image, specifically include:
From the image that present frame video is corresponding, isolated foreground image and background image.
6. a picture contrast adjusting means, it is characterised in that including:
Foreground image processes circuit, for obtaining the foreground image of present frame video, and obtains described foreground picture
The color depth side-play amount of each sample point in Xiang, and inclined to the color depth of each sample point respectively
Shifting amount is normalized, the foreground image after generation process；
Background image processes circuit, for obtaining the background image of described present frame video, and to described background
Image carries out gain process, the background image after generation process；
Image output circuit, processes circuit with described foreground image respectively and described background image processes circuit
Connect, for the background image after described process and the foreground image after described process are overlapped and defeated
Go out the final image after color contrast adjusts.
Device the most according to claim 6, it is characterised in that described foreground image processes circuit bag
Include key maker, non additivity blender, prospect compressor, and key processor；Wherein:
Described key maker, for obtaining the foreground image of current frame video image, and to described current prospect
Image processes, and generates the foreground key signal that described current foreground image is corresponding；
Described non additivity blender, is connected with described key maker, for receiving what described key maker sent
Foreground key signal, and gather the first sample point from described foreground key signal respectively, and from regarding of choosing in advance
Frequently template gathers the second sample point, in each same position in described foreground image and video template
First sample point and the second sample point, be performed both by operating as follows: relatively described first sample point brightness value and
The brightness value of described second sample point, chooses brightness value from described first sample point and described second sample point
Maximum sample point, obtains the color depth side-play amount of described sample point；Wherein, described color depth skew
Amount comprises red-color concentration side-play amount and blue intensity side-play amount；
Prospect compressor, is connected with described non additivity blender, dark for for each sample point
Degree side-play amount, is performed both by operating as follows: according to default expectation key color, the red-color concentration to this sample point
Side-play amount and blue intensity side-play amount are normalized respectively, and wherein, described expectation key color is this sample
The color parameter being expected to be set to of this point；And according to normalization change the red-color concentration side-play amount after process and
Blue intensity side-play amount after normalized creates coordinate diagram, representing the most respectively of this coordinate diagram
Blue intensity side-play amount after normalized and the red-color concentration side-play amount after normalized；By described seat
The horizontally and vertically rotation predetermined angle marked on a map, generates the first coordinate transforming axle and the second coordinate transforming axle；Root
According to the red-color concentration side-play amount after described normalized and the blue intensity side-play amount after normalized, obtain
Take the first data that described first coordinate transforming axle is corresponding, and described second coordinate transforming axle corresponding second
Data；According to described first data and described second data, obtain the acceptance angle that this sample point is corresponding；Wherein,
Described acceptance angle is for characterizing the amplitude of foreground key signal described in this sample point with the increase of saturation
The boundary angle of linearly increasing part；
Key processor, is connected with described prospect compressor, for according to described foreground key signal, before described
First foreground image colouring information of scape compressor output processes, the foreground image after generation process；Its
In, described first foreground image is to be positioned at the part within described acceptance angle in described sample point.
Device the most according to claim 7, it is characterised in that described foreground image processes circuit also
Including multiplier, described multiplier is connected with described prospect compressor, is used for:
Obtain the second foreground image of described prospect compressor output, described second foreground image is carried out gain
Process；Wherein, described second foreground image is to be positioned at the part beyond described acceptance angle in described sample point.
Device the most according to claim 8, it is characterised in that described background image processes circuit and is
Multiplier.
Device the most according to claim 9, it is characterised in that described image output circuit comprises and adds
Musical instruments used in a Buddhist or Taoist mass, described adder processes circuit with described foreground image respectively and described background image processes circuit even
Connect, be used for:
To the first foreground image after processing, the second foreground image after process, and the back of the body after described process
Scape image is overlapped.
11. according to the device described in any one of claim 6-10, it is characterised in that also include that image separates
Device, described image splitter processes circuit with described foreground image respectively and described background image processes circuit even
Connect, be used for:
From the image that present frame video is corresponding, isolated foreground image and background image.
12. devices according to claim 11, it is characterised in that also include image acquisition device, institute
State image acquisition device to be connected with described image splitter, be used for:
Obtain video data, and obtain the image that in described video data, present frame video is corresponding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821196.5A CN105872509A (en) | 2015-11-23 | 2015-11-23 | Image contrast adjustment method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821196.5A CN105872509A (en) | 2015-11-23 | 2015-11-23 | Image contrast adjustment method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105872509A true CN105872509A (en) | 2016-08-17 |
Family
ID=56623779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510821196.5A Pending CN105872509A (en) | 2015-11-23 | 2015-11-23 | Image contrast adjustment method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105872509A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109791748A (en) * | 2016-09-28 | 2019-05-21 | 富士胶片株式会社 | Grating display body, the forming method of raster image, the formation program of the manufacturing method of grating display body and raster image |
| WO2020078027A1 (en) * | 2018-10-15 | 2020-04-23 | 华为技术有限公司 | Image processing method, apparatus and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450444A (en) * | 2002-04-09 | 2003-10-22 | 三星电子株式会社 | Method and circuit for adjusting background contrast in display apparatus |
| CN101052096A (en) * | 2006-04-04 | 2007-10-10 | 广达电脑股份有限公司 | Method and device for regulating image contrast ratio |
| CN101529497A (en) * | 2006-10-27 | 2009-09-09 | 惠普开发有限公司 | Dynamically adjustable elements of an on-screen display |
| US20130235065A1 (en) * | 2007-08-03 | 2013-09-12 | Samsung Electronics Co., Ltd | Method and system of immersive generation for two-dimension still image and factor dominating method, image content analysis method and scaling parameter prediction method for generating immersive sensation |
| CN103327219A (en) * | 2012-03-21 | 2013-09-25 | 浙江大华技术股份有限公司 | Video image contrast adjustment method and device |
| CN104881849A (en) * | 2015-05-25 | 2015-09-02 | 中国科学院上海高等研究院 | Method and system for enhancing color image contrast |
-
2015
- 2015-11-23 CN CN201510821196.5A patent/CN105872509A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450444A (en) * | 2002-04-09 | 2003-10-22 | 三星电子株式会社 | Method and circuit for adjusting background contrast in display apparatus |
| CN101052096A (en) * | 2006-04-04 | 2007-10-10 | 广达电脑股份有限公司 | Method and device for regulating image contrast ratio |
| CN101529497A (en) * | 2006-10-27 | 2009-09-09 | 惠普开发有限公司 | Dynamically adjustable elements of an on-screen display |
| US20130235065A1 (en) * | 2007-08-03 | 2013-09-12 | Samsung Electronics Co., Ltd | Method and system of immersive generation for two-dimension still image and factor dominating method, image content analysis method and scaling parameter prediction method for generating immersive sensation |
| CN103327219A (en) * | 2012-03-21 | 2013-09-25 | 浙江大华技术股份有限公司 | Video image contrast adjustment method and device |
| CN104881849A (en) * | 2015-05-25 | 2015-09-02 | 中国科学院上海高等研究院 | Method and system for enhancing color image contrast |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109791748A (en) * | 2016-09-28 | 2019-05-21 | 富士胶片株式会社 | Grating display body, the forming method of raster image, the formation program of the manufacturing method of grating display body and raster image |
| CN109791748B (en) * | 2016-09-28 | 2021-01-08 | 富士胶片株式会社 | Raster display body, method for forming raster image, method for manufacturing raster display body, and storage medium |
| WO2020078027A1 (en) * | 2018-10-15 | 2020-04-23 | 华为技术有限公司 | Image processing method, apparatus and device |
| US12026863B2 (en) | 2018-10-15 | 2024-07-02 | Huawei Technologies Co., Ltd. | Image processing method and apparatus, and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101639429B1 (en) | Methods and apparatus for color rendering | |
| CN103248793B (en) | The colour of skin optimization method of gamut conversion system and device | |
| CN102611897B (en) | Method and system for carrying out vision perception high-fidelity transformation on color digital image | |
| US8687883B2 (en) | Method and a device for merging a plurality of digital pictures | |
| CN101478687B (en) | Correcting method for pseudo color pixel in digital image | |
| CN109934776A (en) | Model generating method, video enhancement method, device and computer readable storage medium | |
| CN103200409B (en) | Color correction method of multi-projector display system | |
| CN107820069B (en) | Video monitoring equipment ISP debugging method | |
| CN105955733B (en) | A kind of method, apparatus and mobile terminal for modifying icon | |
| CN103383830B (en) | Method for viewing virtual display outputs | |
| CN105933692B (en) | For preparing the method for 3-D view | |
| CN103702095A (en) | Color gamut correction method, device and system of image fusion process | |
| CN109754375A (en) | Image processing method, system, computer equipment, storage medium and terminal | |
| CN108022223A (en) | A kind of tone mapping method based on the processing fusion of logarithmic mapping function piecemeal | |
| CN116034400A (en) | Image processing based on object classification | |
| CN110248242A (en) | A kind of image procossing and live broadcasting method, device, equipment and storage medium | |
| CN106997608A (en) | A kind of method and device for generating halation result figure | |
| CN104641631B (en) | By the color enhancement of gamut extension | |
| WO2022256411A1 (en) | System and method for displaying super saturated color | |
| CN110070515A (en) | Image composition method, device and computer readable storage medium | |
| CN109636739B (en) | Detail processing method and device for enhancing image saturation | |
| CN106709888B (en) | A kind of high dynamic range images production method based on human vision model | |
| CN105872509A (en) | Image contrast adjustment method and device | |
| CN108702494A (en) | Image processing apparatus, imaging device, image processing method and program | |
| Hsin et al. | Color to grayscale transform preserving natural order of hues |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160817 |