1. An image processing apparatus comprising: a low dynamic range image providing unit configured to provide one or more low dynamic range images having different exposure levels; a saturation region detecting unit configured to classify each of the one of more low dynamic range images as a saturation region, an under-saturation region, and a non-saturation region with respect to an intensity value; a feature map generating unit configured to compare the patterns of the non-saturation regions excluding the saturation regions and the under-saturation regions of the one of more low dynamic range images and generating feature maps indicating a similarity between the patterns of the non-saturation regions; a final feature map generating unit configured to convert pixels included in the feature maps into moving pixels and non-moving pixels and generating final feature maps; a moving region definition unit configured to compare the final feature maps and the one or more low dynamic range images and defining moving regions and non-moving regions included in the one or more low dynamic range images; a noise reduction unit configured to remove noise from the moving regions and the non-moving regions by using a first noise reduction filter for the moving regions and a second noise reduction filter for the non-moving regions; and a radiance map generating unit configured to generate a radiance map corresponding to the one or more low dynamic range images by making a weight of the moving regions from which noise is removed smaller than a weight of the non-moving regions from which noise is removed.