Method and apparatus for processing video frame by using difference between pixel values

A method of encoding a video frame, the method comprising:ndividing the video frame into a plurality of pixel blocks each including at least one reference pixel where the at least one reference pixel is predetermined;calculating difference values between the at least one reference pixel in a current pixel block and pixels neighboring the at least one reference pixel where the pixels neighboring the at least one reference pixel are located in the current pixel block;converting the calculated difference values into values that belong to a bit depth range; andperforming entropy coding by using the converted difference values as symbols,wherein the performing of entropy coding comprises:rearranging the converted difference values in an order of occurrence probabilities of the difference values before being converted; andmapping the rearranged difference values to symbols used for entropy coding.

A non-transitory computer-readable recording medium storing a computer-readable program for executing a method comprising:ndividing the video frame into a plurality of pixel blocks each including at least one reference pixel where the at least one reference pixel is predetermined;calculating difference values between the at least one reference pixel in a current pixel block and pixels neighboring the at least one reference pixel where the pixels neighboring the at least one reference pixel are located in the current pixel block;converting the calculated difference values into values that belong to a bit depth range; andperforming entropy coding by using the converted difference values as symbols,wherein the performing of entropy coding comprises:rearranging the converted difference values in an order of occurrence probabilities of the difference values before being converted; andmapping the rearranged difference values to symbols used for entropy coding.

An apparatus for encoding a video frame, the apparatus comprising:na frame dividing unit that divides the video frame into a plurality of pixel blocks each including at least one reference pixel where the at least one reference pixel is predetermined;a difference value calculating unit that calculates difference values between the at least one reference pixel in a current pixel block and pixels neighboring the at least one reference pixel where the pixels neighboring the at least one reference pixel are located in the current pixel block;a difference value converting unit that converts the calculated difference values into values that belong to a bit depth range; andan entropy coding unit that performs entropy coding by using the converted difference values as symbols,wherein the entropy coding unit rearranges the converted difference values in an order of occurrence probabilities of the difference values before being converted, and maps the rearranged difference values to symbols used for entropy coding.

A method of decoding an encoded video frame, the method comprising:nreconstructing symbols used for entropy coding from encoded pixel values;mapping the reconstructed symbols to values that belong to a bit depth range;summing the mapped values and a pixel value of at least one reference pixel where the at least one reference pixel is predetermined;performing a modulo operation on the summed values by using a level value of a bit depth; anddetermining resultant modulo operation values as pixel values of pixels neighboring the at least one reference pixel included in the encoded video frame,wherein the encoded pixel values are based on difference values between the at least one reference pixel in a current pixel block and pixels neighboring the at least one reference pixel where the pixels neighboring the at least one reference pixel are located in the current pixel block.

A non-transitory computer-readable recording medium storing a computer-readable program for executing a method comprising:nreconstructing symbols used for entropy coding from encoded pixel values;mapping the reconstructed symbols to values that belong to a bit depth range;summing the mapped values and a pixel value of at least one reference pixel where the at least one reference pixel is predetermined;performing a modulo operation on the summed values by using a level value of a bit depth; anddetermining resultant modulo operation values as pixel values of pixels neighboring the at least one reference pixel included in the encoded video frame,wherein the encoded pixel values are based on difference values between the at least one reference pixel in a current pixel block and pixels neighboring the at least one reference pixel where the pixels neighboring the at least one reference pixel are located in the current pixel block.

An apparatus for decoding an encoded video frame, the apparatus comprising:na symbol reconstruction unit that reconstructs symbols used for entropy coding from encoded pixel values;a mapping unit that maps the reconstructed symbols to values that belong to a bit depth range;a summing unit that sums the mapped values with a pixel value of at least one reference pixel where the at least one reference pixel is predetermined;a modulo operation performing unit that performs a modulo operation on the summed values by using a level value of a bit depth; anda pixel value determining unit that determines resultant modulo operation values as pixel values of pixels neighboring the at least one reference pixel included in the encoded video frame,wherein the encoded pixel values are based on difference values between the at least one reference pixel in a current pixel block and pixels neighboring the at least one reference pixel where the pixels neighboring the at least one reference pixel are located in the current pixel block.