US 12,309,397 B2
Image processing apparatus and method
Takeshi Tsukuba, Tokyo (JP)
Assigned to Sony Group Corporation, Tokyo (JP)
Appl. No. 17/782,173
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Jan. 22, 2021, PCT No. PCT/JP2021/002296
§ 371(c)(1), (2) Date Jun. 3, 2022,
PCT Pub. No. WO2021/149812, PCT Pub. Date Jul. 29, 2021.
Claims priority of provisional application 62/965,767, filed on Jan. 24, 2020.
Prior Publication US 2023/0045106 A1, Feb. 9, 2023
Int. Cl. H04N 19/00 (2014.01); G06T 5/92 (2024.01); G06T 11/00 (2006.01); G06T 11/60 (2006.01); H04N 19/186 (2014.01)
CPC H04N 19/186 (2014.11) [G06T 5/92 (2024.01); G06T 11/001 (2013.01); G06T 11/60 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An image processing apparatus, comprising:
circuitry configured to:
clip coefficient data subjected to lossless adaptive color transform at a level based on a bit depth of the coefficient data;
clip a luminance component and a color component of the coefficient data at the same level as each other;
clip the luminance component and the color component of the coefficient data with, as an upper bound, a value obtained by subtracting 1 from a power of 2 with a value obtained by adding 1 to the bit depth as a power index;
clips the luminance component and the color component of the coefficient data with, as a lower bound, a value obtained by multiplying −1 by a power of 2 with a value obtained by adding 1 to the bit depth as a power index; and
perform inverse adaptive color transform on the coefficient data clipped at the level by the lossless method.