Partial dynamic false contour detection method based on look-up table and device thereof, and image data compensation method using the same

A dynamic false contour (DFC) detection apparatus, comprising:

• n line memories to receive and temporarily store image data of n pixel lines, respectively;
• a memory controller to store input pixel data in the corresponding n line memories, and to extract corresponding pixel data from the n line memories in parallel;
• n first comparators to compare the pixel data extracted by the memory controller with DFC candidate values stored in a lookup table for adjacent pixels, and to output a comparison result as an m-bit word;
• first logic to generate accumulated m-bit words by performing a bit-by-bit parallel logic operation on the m-bit words output by the n first comparators;
• n buffer memories to sequentially store the accumulated m-bit words generated by the first logic;
• second logic to generate an m-bit word by performing a bit-by-bit logic operation on the accumulated m-bit words stored in one or more of the n buffer memories;
• a second comparator to compare data of a candidate pixel with DFC candidate values stored in a lookup table for candidate pixels, and to output a comparison result as an m-bit word;
• and
• a result integration module to generate an integrated m-bit word by performing a bit-by-bit multiplication operation on the m-bit word generated by the second logic and the m-bit word output by the second comparator, and to detect existence of DFC noise based on the integrated m-bit word.

A method for detecting noise, the method comprising:

• (a) determining whether a data value of a candidate pixel in a predetermined region of an image matches a first dynamic false contour (DFC) candidate value;
• (b) determining whether a data value of at least one pixel adjacent to the candidate pixel matches a second DFC candidate value;
• (c) detecting DFC noise based on (b);
• and
• (d) changing the data value of the candidate pixel based on (a) (b), and (c).