Television color cast adjustment method and apparatus
Disclosed is a television color cast adjustment method, including: dividing a television display screen into a plurality of areas according to a predetermined manner; determining an adjustment coefficient of red light and an adjustment coefficient of blue light in each area according to a position of each area relative to a light bar for the television display screen; adjusting initial image in each area according to the adjustment coefficients of red light and blue light thereof, and displaying the adjusted image in each area on the television display screen. Disclosed is also a television color cast adjustment apparatus. The present disclosure may solve the problem that the color cast appears on television display screens which is caused by the glass light guide plate, thus the viewing effect of TVs is improved.
1. A television color cast adjustment method, comprising:
dividing a television display screen into a plurality of areas according to a predetermined manner;
determining an adjustment coefficient of red light and an adjustment coefficient of blue light in each area, according to a position of each area relative to a light bar for the television display screen; and
adjusting initial image in each area according to the adjustment coefficient of red light and the adjustment coefficient of blue light thereof, and displaying the adjusted image of each area on the television display screen;
wherein the operation of determining an adjustment coefficient of red light and an adjustment coefficient of blue light in each area, according to a position of each area relative to a light bar for the television display screen comprises:
determining a gain compensation coefficient of red light and a gain compensation coefficient of blue light in each area; and
respectively determining the adjustment coefficient of red light and the adjustment coefficient of blue light in each area, according to the position of each area relative to the light bar for the television display screen, the gain compensation coefficient of red light thereof, and the gain compensation coefficient of blue light thereof; wherein, the farther the distance of each area to the light bar for the television display screen is, the smaller the adjustment coefficient of red light thereof is, and the greater the adjustment coefficient of blue light thereof is.
2. The method of claim 1 , wherein, the operation of dividing a television display screen into a plurality of areas according to a predetermined manner comprises:
dividing the television display screen into N areas along a direction parallel to the light bar for the television display screen, wherein N is a positive integer.
3. The method of claim 2 , wherein, the operation of dividing the television display screen into N areas along a direction parallel to the light bar for the television display screen comprises:
dividing the television display screen into N areas of a same size along the direction parallel to the light bar for the television display screen; or dividing the television display screen into N areas of different sizes along the direction parallel to the light bar for the television display screen.
4. The method of claim 1 , wherein, the operation of respectively determining the adjustment coefficient of red light and the adjustment coefficient of blue light in each area according to the position of each area relative to the light bar for the television display screen, the gain compensation coefficient of red light thereof, and the gain compensation coefficient of blue light thereof comprises:
obtaining an adjustment coefficient of red light C R (n) in the nth area by an equation
C
R
(
n
)
=
(
k
R
+
k
B
)
/
2
N
*
a
255
*
(
N
-
b
*
n
)
;
obtaining an adjustment coefficient of blue light C B (n) in the nth area by an equation
C
B
(
n
)
=
(
k
R
+
k
B
)
/
2
N
*
a
255
*
(
c
*
n
-
N
)
;
wherein, k R refers to the number of times of total internal reflection needed for the red light to pass through a television glass light guide plate, k B refers to the number of times of total internal reflection needed for the blue light to pass through the television glass light guide plate, “a” refers to a predetermined color gain value in each area, “b” refers to the gain compensation coefficient of red light in the nth area that is relative to the light bar for the television display screen, “c” refers to the gain compensation coefficient of blue light in the nth area that is relative to the light bar for the television display screen, N refers to the quantity of the divided areas, and “n” is a positive integer and n≤N.
5. The method of claim 4 , wherein, the operation of adjusting initial image in each area according to the adjustment coefficient of red light and the adjustment coefficient of blue light thereof comprises:
obtaining image information of the adjusted image A R (n), A G (n), and A B (n) in the nth area, by equations:
A R ( n )= B R ( n )*[1+ C R ( n )],
A G ( n )= B G ( n )*1,
A B ( n )= B B ( n )*[1+ C B ( n )];
wherein, B R (n), B G (n), and B B (n) refer to three color channels of red (R), green (G), and blue (B), corresponding to the initial image in the nth area.
6. A television color cast adjustment apparatus, wherein, the apparatus comprises:
a dividing module, configured to divide a television display screen into a plurality of areas according to a predetermined manner;
a determining module, configured to determine an adjustment coefficient of red light and an adjustment coefficient of blue light in each area, according to a position of each area relative to a light bar for the television display screen; and
an adjusting module, configured to adjust initial image in each area according to the adjustment coefficient of red light and the adjustment coefficient of blue light thereof, and displaying the adjusted image of each area on the television display screen;
wherein the determining module specifically comprises:
a first determining module, configured to determine a gain compensation coefficient of red light and a gain compensation coefficient of blue light in each area; and
a second determining module, configured to respectively determine the adjustment coefficient of red light and the adjustment coefficient of blue light in each area, according to the position of each area relative to the light bar for the television display screen, the gain compensation coefficient of red light thereof, and the gain compensation coefficient of blue light thereof; wherein, the farther the distance of each area to the light bar for the television display screen is, the smaller the adjustment coefficient of red light thereof is, and the greater the adjustment coefficient of blue light thereof is.
7. The apparatus of claim 6 , wherein, the dividing module is configured to:
divide the television display screen into N areas along a direction parallel to the light bar for the television display screen, wherein N is a positive integer.
8. The method of claim 7 , wherein, the dividing module is configured to:
divide the television display screen into N areas of a same size along the direction parallel to the light bar for the television display screen; or divide the television display screen into N areas of different sizes along the direction parallel to the light bar for the television display screen.
9. The apparatus of claim 6 , wherein, the second determining module is specifically configured to:
obtain an adjustment coefficient of red light C R (n) in the nth area by an equation
C
R
(
n
)
=
(
k
R
+
k
B
)
/
2
N
*
a
255
*
(
N
-
b
*
n
)
;
obtain an adjustment coefficient of blue light C B (n) in the nth area by an equation
C
B
(
n
)
=
(
k
R
+
k
B
)
/
2
N
*
a
255
*
(
c
*
n
-
N
)
;
wherein, k R refers to the number of times of total internal reflection needed for the red light to pass through a television glass light guide plate, k B refers to the number of times of total internal reflection needed for the blue light to pass through the television glass light guide plate, “a” refers to a predetermined color gain value in each area, “b” refers to the gain compensation coefficient of red light in the nth area that is relative to the light bar for the television display screen, “c” refers to the gain compensation coefficient of blue light in the nth area that is relative to the light bar for the television display screen, N refers to the quantity of the divided areas, and “n” is a positive integer and n≤N.
10. The apparatus of claim 9 , wherein, the adjusting module is configured to:
obtain image information of the adjusted image A R (n), A G (n), and A B (n) in the nth area, by equations:
A R ( n )= B R ( n )*[1+ C R ( n )],
A G ( n )= B G ( n )*1,
A B ( n )= B B ( n )*[1+ C B ( n )];
wherein, B R (n), B G (n), and B B (n) refer to three color channels of red (R), green (G), and blue (B), corresponding to the initial image in the nth area.