Spatio-temporal noise removal method using block classification and display device using the same

A display device for displaying images by removing noise from a third field by using a first noise-removed field, a second noise-removed field, and the third field, comprising:

• a motion calculation part adapted to generate a first motion-compensated field by using the third field and the second noise-removed field, generate a second motion-compensated field by using the first and second noise-removed fields, and generate a third motion-compensated field by using the second motion-compensated field and the third field;
• a classification part adapted to generate blocks of the third field into a uniform region and a non-uniform region based on a variance value of a generated difference image by using the third field and any of the first and second motion-compensated fields;
• a temporal filter adapted to perform temporal filtering over every block of the third field based on the first and third motion-compensated fields, the third field, and the variance value;
• a spatio-temporal filter adapted to perform spatio-temporal filtering by performing spatial filtering over every block of the first and third motion-compensated fields and the third field, and by performing the temporal filtering over every block of the third field based on the spatially-filtered value;
• and
• an arithmetic logic unit adapted to output a third noise-removed field by applying a weighted value to the temporal-filtered value and the spatio-temporal-filtered value, respectively, depending on whether a block in the third field is the uniform region or the non-uniform region.