Storage method for gamma value look-up table
View Patent ↗A storage method for a gamma value look-up table comprises storing gamma values corresponding to grays exceeding or equaling a 33rd gray in the gamma value look-up table, and calculating gamma values corresponding to a 1st gray to a 32nd gray by a formula.
1. A method for a gamma value look-up table in a memory of an electronic device, comprising:
storing gamma values corresponding to grays exceeding or equaling a 33rd gray in the gamma value look-up table of the electronic device; and
calculating gamma values corresponding to a 1st gray to a 32nd gray by a formula,
wherein the gamma values corresponding to the 1st gray to the 32nd gray are expressed as the formula:
gamma
(
i
)
=
gamma
(
256
)
×
(
i
256
)
γ
+
(
gamma
(
33
)
-
gamma
(
256
)
×
(
32
256
)
γ
32
)
×
i
,
where, i denotes a gray, i exceeds or equals 1 and is less than or equal to 32, gamma(i) denotes a gamma value corresponding to an ith gray, gamma(256) denotes a gamma value corresponding to the 256th gray, gamma(33) denotes a gamma value corresponding to the 33rd gray, and γ denotes a parameter exceeding or equaling 1.8 and less than or equal to 2.4.
2. The method of claim 1 , wherein the number of grays is 256.
3. The method of claim 1 , wherein the parameter γ is 2.2.
4. The method of claim 3 , wherein each gamma value corresponding to the 33rd gray to the 256th gray is stored in a 10 bit form.
5. The method of claim 4 , wherein gamma values corresponding to the 33rd gray, a 34th gray, a 35th gray and a 36th gray are stored in bytes corresponding to addresses from 0 to 4.
6. The method of claim 5 , further comprising:
storing the lower 8 bits of a gamma value corresponding to a 33rd gray in bit 0 to bit 7 of a byte corresponding to an address which is 0;
storing the higher 2 bits of the gamma value corresponding to the 33rd gray in bit 0 to bit 1 of a byte corresponding to an address which is 4 respectively;
storing the lower 8 bits of a gamma value corresponding to a 34th gray in bit 0 to bit 7 of a byte corresponding to an address which is 1;
storing the higher 2 bits of the gamma value corresponding to the 34th gray in bit 2 to bit 3 of a byte corresponding to an address which is 4 respectively;
storing the lower 8 bits of a gamma value corresponding to a 35th gray in bit 0 to bit 7 of a byte corresponding to an address which is 2;
storing the higher 2 bits of the gamma value corresponding to the 35th gray in bit 4 to bit 5 of a byte corresponding to an address which is 4 respectively;
storing the lower 8 bits of a gamma value corresponding to a 36th gray in bit 0 to bit 7 of a byte corresponding to an address which is 3;
storing the higher 2 bits of the gamma value corresponding to the 36th gray in bit 6 to bit 7 of a byte corresponding to an address which is 4 respectively.