Electronic apparatus and control method thereof

An electronic apparatus comprising:

• a storage configured to store an index matrix comprising a plurality of index vectors and a plurality of filters corresponding to the plurality of index vectors respectively;
• and
• a processor configured to:
• determine whether to transpose an image block based on directivity of the image block including a target pixel and a plurality of surrounding pixels that surround the target pixel,
• obtain a gradient vector from the image block or a transposed image block based on the determination, the gradient vector indicating a relationship between the target pixel and the plurality of surrounding pixels that surround the target pixel,
• obtain correlations of the image block to the plurality of index vectors respectively based on the gradient vector;
• obtain a final image block in which a resolution of the target pixel is enlarged, and wherein the target pixel is image-processed by applying at least one filter from among the plurality of filters to the image block based on the obtained correlations,
• wherein the plurality of index vectors respectively represent a plurality of groups in which a plurality of sample gradient vectors obtained from a plurality of first sample image blocks are divided based on a characteristic of each of the plurality of first sample image blocks,
• wherein the plurality of filters are obtained by learning a relationship between the plurality of first sample image blocks and a plurality of second sample image blocks corresponding to the plurality of first sample image blocks based on each of the plurality of index vectors.