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

Claim 11:
12. A decoder, comprising:
an acquisition unit configured to acquire encoded RAW image data resulting from encoding gradation correction RAW image data that has undergone gradation correction using a gamma coefficient;
a decoding unit configured to decode the encoded RAW image data acquired by the acquisition unit into the gradation correction RAW image data; and
an inverse gradation correction unit configured to execute inverse gradation correction on the gradation correction RAW image data decoded by the decoding unit on the basis of the gamma coefficient and a prescribed value, and output the RAW image data prior to gradation correction,
wherein the inverse correction unit is configured to execute 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 execute 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.