Patent ID: 11895447
Assignee: NIKON CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. A decoding method, comprising:
an acquisition process of acquiring encoded RAW image data resulting from encoding gradation correction RAW image data that has undergone gradation correction using a gamma coefficient;
a decoding process of decoding the encoded RAW image data acquired by the acquisition process into the gradation correction RAW image data; and
an inverse gradation correction process of executing inverse gradation correction on the gradation correction RAW image data decoded by the decoding process on the basis of the gamma coefficient and a prescribed value, and outputting the RAW image data prior to gradation correction;
wherein the inverse correction process executes first inverse gradation correction for a first interval in which the input signal level of the gradation correction RAW image data is less than the prescribed value, and executes second inverse gradation correction for a second interval in which the input signal level of the RAW image data is in at least a portion of a range from the prescribed value to a maximum value.