I recently tried to use Nvidia hardware encoder and decoder. I calculated the PSNR of raw images and decoded images and I found the PSNR is a little bit lower than JPEG compression by using OpenCV or libjpeg. I already choose “NV_ENC_PRESET_LOSSLESS_DEFAULT_GUID” to get the default encoder config.
Is there any other way I have try? What does it mean LOSSLESS? IIUC, lossless should mean we always get a same quality image after compression.
Can anyone help with this? Thanks!