One-dimensional signal adaptive filter for reducing blocking effect and filtering method

A one-dimensional signal adaptive filter comprising:

• an image storing unit for temporarily storing an image data;
• a threshold value calculator for calculating threshold values (T) using a predetermined function of a quantization step (Q) stored in the image storing unit;
• a gradient operation unit for applying a one-dimensional window of a predetermined size along the boundaries of blocks of a predetermined size constituting an image frame stored in the image storing unit, and performing a predetermined gradient operation on each pixel constituting the one-dimensional window, thereby obtaining a gradient operation result for each pixel;
• a threshold value comparator for comparing the gradient operation result of each pixel of the one-dimensional window, obtained by the gradient operation unit, with the corresponding threshold value (T) calculated by the threshold value calculator, thereby generating a result for each pixel;
• a binary edge map generator for generating the result for each pixel of the threshold value comparator as a binary value for each pixel;
• a weighted filter value generator for applying a one-dimensional filter window of a predetermined size on the binary edge map generated by the binary edge map generator, and generating a weighted value only of the edge pixel belonging to the one-dimensional filter window, wherein a weighted value is not generated of a pixel which is not an edge pixel;
• and
• a one-dimensional weighted filter for performing filtering using the weighted value generated by the weighted filter value generator to generate new pixel values.