CN110113590A - A kind of conversion method and device of image color space - Google Patents
A kind of conversion method and device of image color space Download PDFInfo
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- CN110113590A CN110113590A CN201910394136.8A CN201910394136A CN110113590A CN 110113590 A CN110113590 A CN 110113590A CN 201910394136 A CN201910394136 A CN 201910394136A CN 110113590 A CN110113590 A CN 110113590A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
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- H—ELECTRICITY
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Abstract
This application discloses a kind of conversion methods of image color space, first image can be converted into R ' G ' B ' color space from X ' Y ' Z ' color space, so that the color space of the first image after conversion matches with LED display, so that the first image after color space conversion can be shown on LED display.Specifically, available first image, for the first pixel in the first image, first color-values of available first pixel in X ' Y ' Z ' color space, utilize predetermined gamma correction table, gamma correction is carried out to first color-values, obtains corresponding second color-values in XYZ color space.Then, the second color-values are converted, obtains the corresponding third color value in rgb color space.After obtaining third color value, predetermined inverse gamma correction table can use, gamma correction is carried out to the third color value, obtains corresponding 4th color-values in R ' G ' B ' color space, the 4th color-values can be shown on LED display.
Description
Technical field
This application involves field of image processings, more particularly to the conversion method and device of a kind of image color space.
Background technique
Currently, digital movie has unified international standard in the links such as production and broadcasting.Image portion in digital movie
Dividing is one group of well-regulated image sequence, and the value of each pixel is the value in XYZ color space in the image sequence.And it is digital
Projector can match with the XYZ color space, so in the conventional technology, digital movie can only be in digital projector
It plays.
But at present LED display using more and more extensive, still, digital movie can not but be broadcast on LED display
It puts, this is current urgent problem.
Summary of the invention
Technical problems to be solved in this application are that digital movie can not but play on LED display, provide a kind of figure
As the conversion method and device of color space.
In a first aspect, the embodiment of the present application provides a kind of conversion method of image color space, which comprises
Obtain the first image；
For the first pixel in the first image, first pixel is obtained the of X ' Y ' Z ' color space
One color-values；First pixel is any one pixel in the first image；
Using predetermined gamma correction table, gamma correction is carried out to first color-values, obtains the second color-values,
Second color-values are the corresponding color-values in XYZ color space；Including before gamma correction in the gamma correction table
The corresponding relationship between color-values after color-values and gamma correction；
Second color-values are converted, the corresponding third color value in rgb color space is obtained；
Using predetermined inverse gamma correction table, inverse gamma correction is carried out to the third color value, obtains the 4th color
Coloured silk value, the 4th color-values are the corresponding color-values in R ' G ' B ' color space；It include anti-in the inverse gamma correction table
The corresponding relationship between the color-values after color-values and inverse gamma correction before gamma correction.
Optionally, the gamma correction table includes the first gamma correction table and the second gamma correction table；First gamma
The color-values after the corresponding gamma correction of color-values before a gamma correction in checking list；The second gamma correction table
In multiple gamma corrections before the corresponding gamma correction of color-values after color-values；
It is described to utilize predetermined gamma correction table, gamma correction is carried out to first color-values, obtains the second color
Coloured silk value, comprising:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold,
And/or if first color-values are located within the scope of the first color-values, using the second gamma correction table to described first
Color-values carry out gamma correction, obtain second color-values；Otherwise, using the first gamma correction table to first color
Coloured silk value carries out gamma correction, obtains second color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold,
Indicate that user is less than or equal to default attention rate to the degree of concern of first pixel；First color-values are located at the
Within the scope of one color-values, indicate that human eye is lower than default susceptibility to the sensitivity of first color-values.
Optionally, the inverse gamma correction table includes the first inverse gamma correction table and the second inverse gamma correction table；Described
The color-values after the corresponding inverse gamma correction of color-values before an inverse gamma correction in one inverse gamma correction table；Described
The color-values after the corresponding inverse gamma correction of color-values before multiple inverse gamma corrections in two inverse gamma correction tables；
It is described to utilize predetermined inverse gamma correction table, inverse gamma correction is carried out to the third color value, obtains the
Four color-values, comprising:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold,
And/or if the third color value is located within the scope of the second color-values, using the second inverse gamma correction table to the third
Color-values carry out inverse gamma correction, obtain the 4th color-values；Otherwise, using the first inverse gamma correction table to described
Three color-values carry out inverse gamma correction, obtain the 4th color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold,
Indicate that user is less than or equal to default attention rate to the degree of concern of first pixel；The third color value is located at the
Within the scope of two color-values, indicate that human eye is higher than default susceptibility to the sensitivity of the third color value.
Optionally, if second color-values are (X, Y, Z), the third color value is (R, G, B), described to described the
Two color-values are converted, and are obtained the corresponding third color value in rgb color space, are realized by following formula:
Optionally, the method also includes:
The color-values for obtaining the first pixel are the first image of the 4th color-values；
The color-values that first pixel is shown on LED display are first figure of the 4th color-values
Picture.
Second aspect, the embodiment of the present application also provides a kind of conversion equipment of image color space, described device includes:
First acquisition unit, for obtaining the first image；
Second acquisition unit, for obtaining first pixel and existing for the first pixel in the first image
First color-values of X ' Y ' Z ' color space；First pixel is any one pixel in the first image；
First correction unit carries out gamma school to first color-values for utilizing predetermined gamma correction table
Just, the second color-values are obtained, second color-values are the corresponding color-values in XYZ color space；The gamma correction table
In include the color-values before gamma correction and the corresponding relationship between color-values after gamma correction；
Converting unit obtains the corresponding third color in rgb color space for converting to second color-values
Coloured silk value；
Second correction unit carries out anti-gal to the third color value for utilizing predetermined inverse gamma correction table
Horse correction, obtains the 4th color-values, and the 4th color-values are the corresponding color-values in R ' G ' B ' color space；The anti-gal
Including the corresponding relationship between the color-values before inverse gamma correction and the color-values after inverse gamma correction in horse checking list.
Optionally, the gamma correction table includes the first gamma correction table and the second gamma correction table；First gamma
The color-values after the corresponding gamma correction of color-values before a gamma correction in checking list；The second gamma correction table
In multiple gamma corrections before the corresponding gamma correction of color-values after color-values；
The first correction unit, is specifically used for:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold,
And/or if first color-values are located within the scope of the first color-values, using the second gamma correction table to described first
Color-values carry out gamma correction, obtain second color-values；Otherwise, using the first gamma correction table to first color
Coloured silk value carries out gamma correction, obtains second color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold,
Indicate that user is less than or equal to default attention rate to the degree of concern of first pixel；First color-values are located at the
Within the scope of one color-values, indicate that human eye is lower than default susceptibility to the sensitivity of first color-values.
Optionally, the inverse gamma correction table includes the first inverse gamma correction table and the second inverse gamma correction table；Described
The color-values after the corresponding inverse gamma correction of color-values before an inverse gamma correction in one inverse gamma correction table；Described
The color-values after the corresponding inverse gamma correction of color-values before multiple inverse gamma corrections in two inverse gamma correction tables；
The second correction unit, is specifically used for:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold,
And/or if the third color value is located within the scope of the second color-values, using the second inverse gamma correction table to the third
Color-values carry out inverse gamma correction, obtain the 4th color-values；Otherwise, using the first inverse gamma correction table to described
Three color-values carry out inverse gamma correction, obtain the 4th color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold,
Indicate that user is less than or equal to default attention rate to the degree of concern of first pixel；The third color value is located at the
Within the scope of two color-values, indicate that human eye is higher than default susceptibility to the sensitivity of the third color value.
Optionally, if second color-values are (X, Y, Z), the third color value is (R, G, B), and the conversion is single
Member, specifically for being realized by following formula by the second color-values to the conversion of third color value:
Optionally, described device further include:
Third acquiring unit, the color-values for obtaining the first pixel are first figure of the 4th color-values
Picture；
Display unit, for showing that the color-values of first pixel are the 4th color-values on LED display
The first image.
Compared with prior art, the embodiment of the present application has the advantage that
The embodiment of the present application provides a kind of conversion method of image color space, can be by the first image from X ' Y ' Z ' color
Color space is converted into R ' G ' B ' color space, so that the color space of the first image after conversion matches with LED display, from
And the first image after color space is converted is shown on LED display.Specifically, available first figure
Picture, for any one pixel in the first image i.e. the first pixel, available first pixel is in X ' Y ' Z '
First color-values of color space, due to first color-values be it is nonlinear, cannot directly convert thereof into rgb color sky
Between color-values, so in the embodiment of the present application, can use predetermined gamma correction table, to first color-values
Gamma correction is carried out, corresponding second color-values in XYZ color space are obtained, which is linear.Then, right
Second color-values are converted, and the corresponding third color value in rgb color space is obtained, which is linear.
In view of the color-values of the image in practical applications, shown on LED display are nonlinear, so implement in the application
In example, after obtaining third color value, predetermined inverse gamma correction table can use, gal is carried out to the third color value
Horse correction, obtains corresponding 4th color-values in R ' G ' B ' color space, and the 4th color-values are nonlinear, Ke Yi
It is shown on LED display.In the embodiment of the present application, due to the first color-values carry out gamma correction and to third color value into
It when row inverse gamma correction, is realized using predetermined gamma correction table and inverse gamma correction table, with progress gamma correction
It is compared with inverse gamma correction calculating, gamma correction is carried out in the embodiment of the present application and the speed ratio of inverse gamma correction is very fast, thus
Effectively improve the efficiency that color space conversion is carried out to the first image.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow diagram of the conversion method of image color space provided by the embodiments of the present application；
Fig. 2 is a kind of structural schematic diagram of the conversion equipment of image color space provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
At present LED display using more and more extensive, still, digital movie can not but play on LED display, this
It is current urgent problem.Inventor has found under study for action, can to play digital movie on LED display
It is converted with the color space to image sequence included by digital movie, so that the color space and LED after conversion are shown
Screen matches, then digital movie can play on LED display.
Inventor also found under study for action, can carry out to the color space in the image sequence that digital movie includes corresponding
Calculating can be first such as any one pixel in the first image in described image sequence i.e. the first pixel
The original color value of first pixel, i.e. the first color-values in the space X ' Y ' Z ' are first obtained, then to first color
Linear the second color-values in XYZ space are calculated according to corresponding gamma correction algorithms for value；Obtain the second color
After value, which can be converted into linear third color value in rgb space, and press to the third color value
Nonlinear 4th color-values in the space R ' G ' B ' are calculated according to corresponding inverse gamma correction algorithm, so far, are completed
Conversion to the color space of first pixel.But it is aforementioned calculated accordingly using gamma correction algorithms and
It is bigger that corresponding calculation amount is calculated accordingly using inverse gamma correction algorithm, further results in and the first pixel is carried out
The color space conversion spent time is long, correspondingly, the image sequence for including to entire digital movie is caused to carry out color
The efficiency of color space conversion is relatively low.
To solve the above-mentioned problems, the embodiment of the present application provides a kind of conversion method of image color space, can incite somebody to action
First image is converted into R ' G ' B ' color space from X ' Y ' Z ' color space so that conversion after the first image color space with
LED display matches, so that the first image after color space conversion can be shown on LED display.Specifically
Ground, available first image, for any one pixel in the first image i.e. the first pixel, available described
One pixel X ' Y ' Z ' color space the first color-values, due to first color-values be it is nonlinear, cannot directly by
Its color-values for being converted into rgb color space, so in the embodiment of the present application, can use predetermined gamma correction
Table carries out gamma correction to first color-values, obtains corresponding second color-values in XYZ color space, second color
Coloured silk value is linear.Then, the second color-values are converted, obtains the corresponding third color value in rgb color space, it should
Third color value is linear.In view of the color-values of the image in practical applications, shown on LED display are non-linear
, so in the embodiment of the present application, after obtaining third color value, can use predetermined inverse gamma correction table, it is right
The third color value carries out gamma correction, obtains corresponding 4th color-values in R ' G ' B ' color space, the 4th color
It is nonlinear for being worth, and can be shown on LED display.In the embodiment of the present application, due to carrying out gamma to the first color-values
It is real using predetermined gamma correction table and inverse gamma correction table when correcting and carrying out inverse gamma correction to third color value
Existing, compared with carrying out gamma correction and inverse gamma correction calculating, gamma correction and anti-gamma school are carried out in the embodiment of the present application
Positive speed ratio is very fast, to effectively improve the efficiency for carrying out color space conversion to the first image.
With reference to the accompanying drawing, the various non-limiting embodiments of the application are described in detail.
Illustrative methods
Referring to Fig. 1, which is a kind of process signal of the conversion method of image color space provided by the embodiments of the present application
Figure.
The conversion method of image color space provided by the embodiments of the present application, can be by having the equipment of data processing function
Realize, the embodiment of the present application do not limit specifically described in have the equipment of data processing function, the equipment can be terminal device,
The equipment can also be server, the equipment may be integrated medium module (Integrated Media Block,
IMB)。
In the embodiment of the present application, the method can for example be realized by following steps S101-S105.
S101: the first image is obtained.
It should be noted that the first image referred in the embodiment of the present application, can be image included by digital movie
Any one frame image in sequence.
In the embodiment of the present application, the color-values of each pixel are in X ' Y ' Z ' color space pair in the first image
The color-values answered.
S102: for the first pixel in the first image, it is empty in X ' Y ' Z ' color to obtain first pixel
Between in the first color-values.
In the embodiment of the present application, first pixel is any one pixel in the first image.
S103: utilizing predetermined gamma correction table, carries out gamma correction to first color-values, obtains the second color
Coloured silk value.
It is understood that first color-values be it is nonlinear, first color-values directly cannot be converted into RGB
Color-values in color space.Therefore, in the embodiment of the present application, the first color-values can be converted into XYZ color sky first
Between in linear color-values.Specifically, it can use predetermined gamma correction table, gal carried out to first color-values
Horse conversion obtains corresponding the second linear color-values in XYZ color space.
It should be noted that in the embodiment of the present application, in the gamma correction table including the color-values before gamma correction
Corresponding relationship between the color-values after gamma correction, that is to say, that in the embodiment of the present application, obtain first color
It is corresponding when the color-values before gamma correction can be searched in the gamma correction table are first color-values after value
Color-values after gamma correction, to obtain second color-values.
It should be noted that in the embodiment of the present application, the color before the gamma correction for including in the gamma correction table
The corresponding relationship between color-values (X, Y, Z) after value (X ', Y ', Z ') and gamma correction, can must by following formula (1)
It arrives:
Wherein, P represents peak brightness, and L represents reference brightness, and unit is all: cd/ ㎡；Wherein the value of P and L can be
Empirical value.
S104: converting second color-values, obtains the corresponding third color value in rgb color space.
It is understood that the second color-values obtained in S103 are linear, so the second color-values can be converted
At third color value corresponding in rgb space.
The embodiment of the present application, which does not limit specifically, converts second color-values, obtains the tool of the third color value
Body implementation can use following formula (2) for the second color-values (X, Y, Z) and be calculated described as an example
Three color-values (R, G, B).
In formula (2), matrixIt is determining based on experience value.
S105: utilizing predetermined inverse gamma correction table, carries out inverse gamma correction to the third color value, obtains the
Four color-values.
It should be noted that third color value is linear, and the color-values of the image shown on LED display are non-
Linear, so in the embodiment of the present application, after obtaining third color value, third color value can be converted into R ' G ' B ' color
Nonlinear color-values in color space, the first image after color space is converted are shown on LED display.
Specifically, in the embodiment of the present application, it can use predetermined inverse gamma correction table, the third color value carried out anti-
Gamma conversion, obtains corresponding nonlinear 4th color-values in R ' G ' B ' color space.
It should be noted that in the embodiment of the present application, in the inverse gamma correction table including the color before inverse gamma correction
The corresponding relationship between color-values after coloured silk value and inverse gamma correction.That is, in the embodiment of the present application, described the is obtained
After three color-values, the color-values before inverse gamma correction can be searched in the inverse gamma correction table are the third color value
When, the color-values after corresponding inverse gamma correction, to obtain the 4th color-values.
It should be noted that in the embodiment of the present application, before the inverse gamma correction for including in the inverse gamma correction table
The corresponding relationship between color-values (R ', G ', B ') after color-values (R, G, B) and gamma correction, can pass through following formula (3)
It obtains:
It is understood that the 4th color-values be in R ' G ' B ' color space nonlinear color-values, and due to
The matched color space of LED display is R ' G ' B ' color space, so to each picture in the image sequence in digital movie
Vegetarian refreshments is performed both by after abovementioned steps S101-S105, and obtained digital movie can play on LED display.In other words, exist
In a kind of implementation of the embodiment of the present application, the color-values of available first pixel are the described of the 4th color-values
First image, and show that the color-values of first pixel are described the first of the 4th color-values on LED display
Image.
As can be seen from the above description, the conversion method of image color space provided by the embodiments of the present application, can be by first
Image is converted into R ' G ' B ' color space from X ' Y ' Z ' color space, so that the color space and LED of the first image after conversion
Display screen matches, so that the first image after color space conversion can be shown on LED display.Specifically,
Available first image, for any one pixel in the first image i.e. the first pixel, available described first
Pixel X ' Y ' Z ' color space the first color-values, due to first color-values be it is nonlinear, cannot be directly by it
The color-values of rgb color space are converted into, so in the embodiment of the present application, can use predetermined gamma correction table,
Gamma correction is carried out to first color-values, obtains corresponding second color-values in XYZ color space, second color-values
It is linear.Then, the second color-values are converted, obtains corresponding third color value, the third in rgb color space
Color-values are linear.In view of the image in practical applications, shown on LED display color-values be it is nonlinear,
So after in the embodiment of the present application, obtaining third color value, can use predetermined inverse gamma correction table, to described
Third color value carries out gamma correction, obtains corresponding 4th color-values in R ' G ' B ' color space, the 4th color-values are
It is nonlinear, it can be shown on LED display.In the embodiment of the present application, due to carrying out gamma correction to the first color-values
It when with carrying out inverse gamma correction to third color value, is realized using predetermined gamma correction table and inverse gamma correction table
, compared with carrying out gamma correction and inverse gamma correction calculating, gamma correction and inverse gamma correction are carried out in the embodiment of the present application
Speed ratio it is very fast, thus effectively improve to the first image carry out color space conversion efficiency.
In addition, in traditional technology, due to needing calculate according to corresponding gamma correction algorithms to the first color-values
To the second color-values, and need that third color value according to corresponding inverse gamma correction algorithm is carried out that the 4th color is calculated
Value.It is understood that when executing aforementioned gamma correction algorithms and inverse gamma correction algorithm under different running environment,
It may be in the presence of the conversion and shape data alignment thereof retained between digit difference, real-coded GA after such as decimal point
Not parity problem bring data conversion value error, the color so as to cause the first image loses and the first image file damage
It is bad.
But in the embodiment of the present application, due to being to determine corresponding second color of the first color-values using gamma correction table
Value, and corresponding 4th color-values of third color value are determined using inverse gamma correction table, so utilize the embodiment of the present application
Scheme can be direct by unified checking list (including gamma correction table and inverse gamma correction table) under various running environment
The second color-values and the 4th color-values are obtained, so that the color loss and image damage of the first image will not be led to problems such as.
It is understood that on the one hand, for the first image, user is to the pixel of different location in the first image
Degree of concern is different, it is however generally that, the distance of the central point of the first image of distance is less than the pixel of preset threshold, the pass of user
Note degree can be higher, and is more than or equal to the pixel of preset threshold for example for the distance of the central point of the first image of distance
The degree of concern of the pixel of the marginal portion of first image, user can be relatively low.Therefore, for the center of the first image of distance
The distance of point is less than for the pixel of preset threshold, and the required precision that gamma conversion is carried out to it is also relatively high, correspondingly, right
For the distance of the central point of the first image of distance is more than or equal to the pixel of preset threshold, gamma conversion is carried out to it
Required precision it is comparatively relatively low.On the other hand, since sensitivity of the human eye for different color may be different
's.For the color-values in some Color Ranges, human eye tends not to tell its difference.In another aspect, the gamma correction
The size of the data volume of table directly affects the execution efficiency of abovementioned steps S103.
So promoting the execution efficiency of abovementioned steps S103 in the embodiment of the present application, the gamma correction table be can wrap
Include the first gamma correction table and the second gamma correction table.Wherein, the color-values before the gamma correction in the first gamma correction table with
It is one-to-one relationship between color-values after gamma correction, that is to say, that a gamma school in the first gamma correction table
The color-values after the corresponding gamma correction of color-values before just.And the color-values before the gamma correction in the second gamma correction table
It is many-to-one corresponding relationship between the color-values after gamma correction, that is to say, that more in the second gamma correction table
The color-values after the corresponding gamma correction of color-values before a gamma correction.
In the embodiment of the present application, for the first pixel, if user compares the degree of concern of the first pixel
It is low, and/or, human eye is not high to the sensitivity of first color-values, then, can when the first color-values being converted into the second color-values
Without requiring very high conversion accuracy.So in the embodiment of the present application, if first pixel is apart from first figure
The distance of the central point of picture is more than or equal to preset threshold, and/or, if first color-values are located at the first color-values range
It is interior, then gamma correction is carried out to first color-values using the second gamma correction table, obtains second color-values；It is no
Then, gamma correction is carried out to first color-values using the first gamma correction table, obtains second color-values.
Wherein, the distance of central point of first pixel apart from the first image is more than or equal to described default
Threshold value indicates that user is less than or equal to default attention rate to the degree of concern of first pixel, i.e., expression user is to institute
The degree of concern for stating the first pixel is relatively low；First color-values are located within the scope of the first color-values, indicate human eye to institute
The sensitivity for stating the first color-values is lower than default susceptibility, i.e. expression human eye compares the sensitivity of first color-values
It is low.
It is understood that for the second gamma correction table comprising gamma correction before color-values and gamma
The quantity of the corresponding relationship between color-values after correction, the color before the gamma correction for including than the first gamma correction table
The corresponding relationship between color-values after value and gamma correction is few, therefore, determines the second color-values using the second gamma correction table
Efficiency, than determining the high-efficient of the second color-values using the first gamma correction table.That is, for more in the first image
For a pixel, partial pixel o'clock determines the second color-values using the first gamma correction table, and partial pixel point utilizes the second gal
Horse checking list determines the second color-values, rather than the multiple pixel determines the second color using the first gamma correction table
Value carries out the first image to improve so improving the efficiency for carrying out gamma conversion to the pixel in the first image
The efficiency of color conversion.
The embodiment of the present application does not limit the preset threshold specifically, the preset threshold can determines according to actual conditions,
The embodiment of the present application is not specifically limited.The embodiment of the present application does not limit the first color-values range specifically yet, and described first
Color-values within the scope of color-values, human eye cannot tell its difference.
It should be noted that for the second gamma correction table, when predefining the second gamma correction table, for more
Color-values before a gamma correction can arbitrarily select a color-values from the color-values before the multiple gamma correction, benefit
Color-values after corresponding gamma correction is calculated with aforementioned formula (1), by the color after the gamma correction being calculated
Value is as the color-values after the corresponding gamma correction of color-values before the multiple gamma correction.
Similarly, in order to promote the execution efficiency of abovementioned steps S105, the inverse gamma correction table may include first anti-
Gamma correction table and the second inverse gamma correction table.Wherein, the color-values before the inverse gamma correction in the first inverse gamma correction table with
It is one-to-one relationship between color-values after inverse gamma correction, that is to say, that one in the first inverse gamma correction table is anti-
The color-values after the corresponding inverse gamma correction of color-values before gamma correction.And the anti-gamma school in the second inverse gamma correction table
It is many-to-one corresponding relationship between the color-values after color-values and inverse gamma correction before just, that is to say, that described second is anti-
The color-values after the corresponding inverse gamma correction of color-values before multiple inverse gamma corrections in gamma correction table.
In the embodiment of the present application, for the first pixel, if user compares the degree of concern of the first pixel
It is low, and/or, human eye is not high to the sensitivity of first color-values, then, can when third color value being converted into four color-values
Without requiring very high conversion accuracy.So in the embodiment of the present application, if first pixel is apart from first figure
The distance of the central point of picture is more than or equal to preset threshold, and/or, if the third color value is located at the second color-values range
It is interior, then inverse gamma correction is carried out to first color-values using the second inverse gamma correction table, obtains the 4th color
Value；Otherwise, inverse gamma correction is carried out to first color-values using the first inverse gamma correction table, obtains the 4th color
Coloured silk value.
Wherein, the distance of central point of first pixel apart from the first image is more than or equal to described default
Threshold value indicates that user is less than or equal to default attention rate to the degree of concern of first pixel, i.e., expression user is to institute
The degree of concern for stating the first pixel is relatively low；The third color value is located within the scope of the second color-values, indicates human eye to institute
The sensitivity for stating third color value is lower than default susceptibility, i.e. expression human eye compares the sensitivity of the third color value
It is low.
It is understood that for the second inverse gamma correction table comprising inverse gamma correction before color-values and
The quantity of the corresponding relationship between color-values after inverse gamma correction, the anti-gamma school for including than the first inverse gamma correction table
The corresponding relationship between the color-values after color-values and inverse gamma correction before just is few, therefore, utilizes the second inverse gamma correction table
The efficiency for determining the 4th color-values, than determining the high-efficient of the second color-values using the first inverse gamma correction table.That is, right
For all pixels point in the first image, partial pixel o'clock determines the 4th color-values, portion using the first inverse gamma correction table
Pixel is divided to determine the 4th color-values using the second inverse gamma correction table, rather than all pixels utilize the first anti-gamma
Checking list determines the 4th color-values, so the efficiency that anti-gamma conversion is carried out to the pixel in the first image is improved, thus
Improve the efficiency that color conversion is carried out to the first image.
It should be noted that for the second inverse gamma correction table, it is right when predefining the second inverse gamma correction table
Color-values before multiple inverse gamma corrections can arbitrarily select a color from the color-values before the multiple inverse gamma correction
Coloured silk value, the color-values after corresponding inverse gamma correction is calculated using aforementioned formula (3), the anti-gamma school that this is calculated
Color-values after just are as the color-values after the corresponding inverse gamma correction of color-values before the multiple inverse gamma correction.
In a kind of implementation of the embodiment of the present application, it is contemplated that digital movie includes one group of image sequence, that is, includes
Aforementioned first image of multiframe executes the equipment such as IMB of abovementioned steps S101-S105, may include in the embodiment of the present application
Multiple execution units, multiple execution unit can execute abovementioned steps S101-S105 parallel, i.e., the multiple execution unit can
To carry out the conversion of color space to the first image of difference in the digital movie simultaneously, to be promoted to entire digital movie
Carry out the efficiency of color space.
Example devices
Conversion method based on the image color space that above embodiments provide, the embodiment of the present application also provides a kind of figures
As the conversion equipment of color space, the device is introduced below in conjunction with attached drawing.
Referring to fig. 2, which is a kind of structural representation of the conversion equipment of image color space provided by the embodiments of the present application
Figure.
The device 200 of the conversion of image color space provided by the embodiments of the present application, specifically includes: first acquisition unit
201, second acquisition unit 202, first corrects unit 203, converting unit 204 and the second correction unit 205.
First acquisition unit 201, for obtaining the first image；
Second acquisition unit 202, for obtaining first pixel for the first pixel in the first image
In the first color-values of X ' Y ' Z ' color space；First pixel is any one pixel in the first image；
First correction unit 203 carries out gamma to first color-values for utilizing predetermined gamma correction table
Correction, obtains the second color-values, and second color-values are the corresponding color-values in XYZ color space；The gamma correction
Including the corresponding relationship between the color-values before gamma correction and the color-values after gamma correction in table；
Converting unit 204 obtains corresponding in rgb color space for converting to second color-values
Three color-values；
Second correction unit 205 carries out the third color value anti-for utilizing predetermined inverse gamma correction table
Gamma correction, obtains the 4th color-values, and the 4th color-values are the corresponding color-values in R ' G ' B ' color space；It is described anti-
Including the corresponding relationship between the color-values before inverse gamma correction and the color-values after inverse gamma correction in gamma correction table.
Optionally, the gamma correction table includes the first gamma correction table and the second gamma correction table；First gamma
The color-values after the corresponding gamma correction of color-values before a gamma correction in checking list；The second gamma correction table
In multiple gamma corrections before the corresponding gamma correction of color-values after color-values；
The first correction unit 203, is specifically used for:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold,
And/or if first color-values are located within the scope of the first color-values, using the second gamma correction table to described first
Color-values carry out gamma correction, obtain second color-values；Otherwise, using the first gamma correction table to first color
Coloured silk value carries out gamma correction, obtains second color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold,
Indicate that user is less than or equal to default attention rate to the degree of concern of first pixel；First color-values are located at the
Within the scope of one color-values, indicate that human eye is lower than default susceptibility to the sensitivity of first color-values.
Optionally, the inverse gamma correction table includes the first inverse gamma correction table and the second inverse gamma correction table；Described
The color-values after the corresponding inverse gamma correction of color-values before an inverse gamma correction in one inverse gamma correction table；Described
The color-values after the corresponding inverse gamma correction of color-values before multiple inverse gamma corrections in two inverse gamma correction tables；
The second correction unit 205, is specifically used for:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold,
And/or if the third color value is located within the scope of the second color-values, using the second inverse gamma correction table to the third
Color-values carry out inverse gamma correction, obtain the 4th color-values；Otherwise, using the first inverse gamma correction table to described
Three color-values carry out inverse gamma correction, obtain the 4th color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold,
Indicate that user is less than or equal to default attention rate to the degree of concern of first pixel；The third color value is located at the
Within the scope of two color-values, indicate that human eye is higher than default susceptibility to the sensitivity of the third color value；
Optionally, characteristic is, if second color-values are (X, Y, Z), the third color value is (R, G, B),
The converting unit 204, specifically for being realized by following formula by the second color-values to the conversion of third color value:
Optionally, described device further include:
Third acquiring unit, the color-values for obtaining the first pixel are first figure of the 4th color-values
Picture；
Display unit, for showing that the color-values of first pixel are the 4th color-values on LED display
The first image.
Since described device 200 is the corresponding device of method provided with above method embodiment, described device 200 it is each
The specific implementation of a unit is same design with above method embodiment, accordingly, with respect to each unit of described device 200
Specific implementation, can refer to above method embodiment description section, details are not described herein again.
As can be seen from the above description, the first image can be converted into R ' G ' B ' color space from X ' Y ' Z ' color space,
So that the color space of the first image after conversion matches with LED display so that color space convert after the
One image can be shown on LED display.Specifically, available first image, for any one in the first image
Pixel i.e. the first pixel, available first pixel X ' Y ' Z ' color space the first color-values, by institute
State the first color-values be it is nonlinear, cannot directly convert thereof into the color-values of rgb color space, so the application implement
In example, predetermined gamma correction table can use, gamma correction is carried out to first color-values, is obtained in XYZ color
Corresponding second color-values in space, second color-values are linear.Then, the second color-values are converted, is obtained
Corresponding third color value in rgb color space, the third color value are linear.In view of in practical applications, being shown in LED
Show that the color-values of the image of screen display are nonlinear, so in the embodiment of the present application, it, can after obtaining third color value
To utilize predetermined inverse gamma correction table, gamma correction is carried out to the third color value, is obtained empty in R ' G ' B ' color
Between in corresponding 4th color-values, the 4th color-values be it is nonlinear, can be shown on LED display.In the application reality
It applies in example, is using preparatory when due to carrying out gamma correction to the first color-values and carrying out inverse gamma correction to third color value
What determining gamma correction table and inverse gamma correction table were realized, compared with carrying out gamma correction and inverse gamma correction calculating, this Shen
Gamma correction please being carried out in embodiment and the speed ratio of inverse gamma correction being very fast, color is carried out to the first image to effectively improve
The efficiency of color space conversion.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the application
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by following
Claim is pointed out.
It should be understood that the application is not limited to the precise structure that has been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims
The foregoing is merely the preferred embodiments of the application, not to limit the application, it is all in spirit herein and
Within principle, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this application.
Claims (10)
1. a kind of conversion method of image color space, which is characterized in that the described method includes:
Obtain the first image；
For the first pixel in the first image, first pixel is obtained in the first color of X ' Y ' Z ' color space
Coloured silk value；First pixel is any one pixel in the first image；
Using predetermined gamma correction table, gamma correction is carried out to first color-values, obtains the second color-values, it is described
Second color-values are the corresponding color-values in XYZ color space；It include the color before gamma correction in the gamma correction table
The corresponding relationship between color-values after value and gamma correction；
Second color-values are converted, the corresponding third color value in rgb color space is obtained；
Using predetermined inverse gamma correction table, inverse gamma correction is carried out to the third color value, obtains the 4th color-values,
4th color-values are the corresponding color-values in R ' G ' B ' color space；It include anti-gamma school in the inverse gamma correction table
The corresponding relationship between the color-values after color-values and inverse gamma correction before just.
2. the method according to claim 1, wherein the gamma correction table includes the first gamma correction table and the
Two gamma correction tables；After the corresponding gamma correction of color-values before a gamma correction in the first gamma correction table
Color-values；The color after the corresponding gamma correction of color-values before multiple gamma corrections in the second gamma correction table
Value；
It is described to utilize predetermined gamma correction table, gamma correction is carried out to first color-values, obtains the second color-values,
Include:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold, and/or,
If first color-values are located within the scope of the first color-values, using the second gamma correction table to first color-values
Gamma correction is carried out, second color-values are obtained；Otherwise, using the first gamma correction table to first color-values into
Row gamma correction obtains second color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold, indicates
User is less than or equal to default attention rate to the degree of concern of first pixel；First color-values are located at the first color
In coloured silk value range, indicate that human eye is lower than default susceptibility to the sensitivity of first color-values.
3. the method according to claim 1, wherein the inverse gamma correction table includes the first inverse gamma correction table
With the second inverse gamma correction table；Color-values corresponding one before an inverse gamma correction in the first inverse gamma correction table is anti-
Color-values after gamma correction；Color-values corresponding one before multiple inverse gamma corrections in the second inverse gamma correction table is anti-
Color-values after gamma correction；
It is described to utilize predetermined inverse gamma correction table, inverse gamma correction is carried out to the third color value, obtains the 4th color
Coloured silk value, comprising:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold, and/or,
If the third color value is located within the scope of the second color-values, using the second inverse gamma correction table to the third color value
Inverse gamma correction is carried out, the 4th color-values are obtained；Otherwise, using the first inverse gamma correction table to the third color
Value carries out inverse gamma correction, obtains the 4th color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold, indicates
User is less than or equal to default attention rate to the degree of concern of first pixel；The third color value is located at the second color
In coloured silk value range, indicate that human eye is higher than default susceptibility to the sensitivity of the third color value.
4. method according to claim 1 to 3, characteristic are, if second color-values are (X, Y, Z),
The third color value is (R, G, B), described to convert to second color-values, is obtained corresponding in rgb color space
Third color value, realized by following formula:
5. method according to claim 1 to 3, which is characterized in that the method also includes:
The color-values for obtaining the first pixel are the first image of the 4th color-values；
The color-values that first pixel is shown on LED display are the first image of the 4th color-values.
6. a kind of conversion equipment of image color space, which is characterized in that described device includes:
First acquisition unit, for obtaining the first image；
Second acquisition unit, for obtaining first pixel in X ' Y ' for the first pixel in the first image
First color-values of Z ' color space；First pixel is any one pixel in the first image；
First correction unit carries out gamma correction to first color-values, obtains for utilizing predetermined gamma correction table
To the second color-values, second color-values are the corresponding color-values in XYZ color space；Include in the gamma correction table
The corresponding relationship between the color-values after color-values and gamma correction before gamma correction；
Converting unit obtains the corresponding third color in rgb color space for converting to second color-values
Value；
Second correction unit carries out anti-gamma school to the third color value for utilizing predetermined inverse gamma correction table
Just, the 4th color-values are obtained, the 4th color-values are the corresponding color-values in R ' G ' B ' color space；The anti-gamma school
Including the corresponding relationship between the color-values before inverse gamma correction and the color-values after inverse gamma correction in positive table.
7. device according to claim 6, which is characterized in that the gamma correction table includes the first gamma correction table and the
Two gamma correction tables；After the corresponding gamma correction of color-values before a gamma correction in the first gamma correction table
Color-values；The color after the corresponding gamma correction of color-values before multiple gamma corrections in the second gamma correction table
Value；
The first correction unit, is specifically used for:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold, and/or,
If first color-values are located within the scope of the first color-values, using the second gamma correction table to first color-values
Gamma correction is carried out, second color-values are obtained；Otherwise, using the first gamma correction table to first color-values into
Row gamma correction obtains second color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold, indicates
User is less than or equal to default attention rate to the degree of concern of first pixel；First color-values are located at the first color
In coloured silk value range, indicate that human eye is lower than default susceptibility to the sensitivity of first color-values.
8. device according to claim 6, which is characterized in that the inverse gamma correction table includes the first inverse gamma correction table
With the second inverse gamma correction table；Color-values corresponding one before an inverse gamma correction in the first inverse gamma correction table is anti-
Color-values after gamma correction；Color-values corresponding one before multiple inverse gamma corrections in the second inverse gamma correction table is anti-
Color-values after gamma correction；
The second correction unit, is specifically used for:
If the distance of central point of first pixel apart from the first image is more than or equal to preset threshold, and/or,
If the third color value is located within the scope of the second color-values, using the second inverse gamma correction table to the third color value
Inverse gamma correction is carried out, the 4th color-values are obtained；Otherwise, using the first inverse gamma correction table to the third color
Value carries out inverse gamma correction, obtains the 4th color-values；
The distance of central point of first pixel apart from the first image is more than or equal to the preset threshold, indicates
User is less than or equal to default attention rate to the degree of concern of first pixel；The third color value is located at the second color
In coloured silk value range, indicate that human eye is higher than default susceptibility to the sensitivity of the third color value.
9. according to device described in claim 6-8 any one, characteristic is, if second color-values are (X, Y, Z),
The third color value is (R, G, B), and the converting unit is specifically used for through the realization of following formula by the second color-values to the
The conversion of three color-values:
10. according to device described in claim 6-8 any one, which is characterized in that described device further include:
Third acquiring unit, the color-values for obtaining the first pixel are the first image of the 4th color-values；
Display unit, for showing the color-values of first pixel for the institute of the 4th color-values on LED display
State the first image.
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