| CPC G06T 5/002 (2013.01) [G06T 5/50 (2013.01); G06T 7/40 (2013.01); G06T 2207/20182 (2013.01)] | 14 Claims |
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1. An electronic device comprising:
an input interface comprising a circuit; and
a processor configured to:
convert an input image input through the input interface to a first frequency domain signal,
based on first energy information for each of a plurality of first pixel blocks included in the input image in the first frequency domain signal, obtain first information indicating whether each of the plurality of first pixel blocks is a texture block,
obtain first ratio information of the texture block among the plurality of first pixel blocks based on the first information,
perform noise removal processing on the image input,
convert the noise-removed image to a second frequency domain signal,
based on second energy information for each of a plurality of second pixel blocks included in the noise-removed image in the second frequency domain signal, obtain second information indicating whether each of the plurality of second pixel blocks is the texture block,
obtain second ratio information of the texture block among the plurality of second pixel blocks based on the second information,
obtain energy amount corresponding to each of the plurality of second pixel blocks by summing up energy amount of frequency bands having a value equal to or more than a first threshold value in the second frequency domain signal,
obtain third information on maximum energy amount, among energy amount of each of the plurality of second pixel blocks, and
identify whether the input image is an upscaled image based on a difference between the first ratio information and second ratio information, the second ratio information and the third information.
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