Method for filtering an image

In a method for recovering a compressed motion image for processing an original pixel f(i,j) based on a DCT by the unit of macro blocks of a M×M size, quantizing the DCT-processed coefficient, transmitting together with motion vector information, reversely quantizing and reversely DCT-processing the compressed pixel g(i,j) and recovering an image similar to the original image, a method for recovering a compressed motion picture, comprising the steps of:

• defining a cost function M(i,j) having a smoothing degree of an image and a reliability with respect to an original image as a pixel unit in consideration of a directional characteristic between the pixels which will be recovered and the pixels neighboring the pixels which will be recovered;
• adaptively searching a regularization parameter variable having a weight of a reliability with respect to the original image from the cost function M(i,j);
• and
• obtaining a projected pixel P(F(u,v)) using a projection method for mapping the pixels which will be recovered in accordance with a range value of the pixels which will be recovered,
• wherein said regularization parameter variable is a weight value with respect to reliability and is determined based on a difference between the original pixel and the compressed pixel and a difference value between the original pixel and the neighboring pixel.

In a method for recovering a compressed motion image for processing an original pixel f(i,j) based on a DCT by the unit of macro blocks of a M×M size, quantizing the DCT-processed coefficient, transmitting together with motion vector information, reversely quantizing and reversely DCT-processing the compressed pixel g(i,j) and recovering an image similar to the original image, a method for recovering a compressed motion picture, comprising the steps of:

• defining a cost function M(i,j) having a smoothing degree of an image and a reliability with respect to an original image as a pixel unit in consideration of a directional characteristic between the pixels which will be recovered and the pixels neighboring the pixels which will be recovered;
• adaptively searching a regularization parameter variable having a weight of a reliability with respect to the original image from the cost function M(i,j);
• and
• obtaining a finally recovered image of a spatial region by obtaining a block DCT coefficient based on a block DCT and obtaining a projected pixel P(F(u,v)) by a projection method for mapping the pixels which will be recovered in a range value of the pixel for processing the block DCT coefficient, and performing a reverse DCT,
• wherein said regularization parameter variable is a weight value with respect to reliability and is determined based on a difference between the original pixel and the compressed pixel and a difference value between the original pixel and the neighboring pixel.

An apparatus for recovering a compressed motion picture, comprising:

• an image decoding unit for outputting an information with respect to an image which will be recovered such as a decoded image, a quantized variable, a macro block type, and a motion type by decoding a coded image signal;
• and
• a block process eliminating filter for defining a cost function based on a smoothing degree of an image and a reliability with respect to an original pixel in consideration of a directional characteristic between the neighboring pixel and the pixel which will be processed based on the pixels which will be recovered using an information with respect to the image which will be recovered inputted from the image decoding unit, adaptively searching a regularization parameter variable which provides a weight of a reliability with respect to the original image for each cost function, and recovering an original pixel using a projection method for mapping the pixels which will be recovered in accordance with a range value of the pixels which will be processed,
• wherein said regularization parameter variable is a weight value with respect to reliability and is determined based on a difference between the original pixel and the compressed pixel and a difference value between the original pixel and the neighboring pixel.

In a method for recovering a compressed motion image for processing an original pixel f(i,j) based on a DCT by the unit of macro blocks of a M×M size, quantizing the DCT-processed coefficient, transmitting together with motion vector information, reversely quantizing and reversely DCT-processing the compressed pixel g(i,j) and recovering an image similar to the original image, a method for recovering a compressed motion picture, comprising the steps of:

• defining a cost function M(i,j) having a smoothing degree of an image and a reliability with respect to an original image as a pixel unit in consideration with a directional characteristic between the pixels which will be recovered and the pixels neighboring the pixels which will be recovered;
• and
• adaptively searching a regularization parameter variable having a weight of a reliability with respect to the original image from the cost function M(i,j) and a weight value of a smoothing degree of the original image,
• wherein said regularization parameter variable is a weight value with respect to reliability and is determined based on a difference between the original pixel and the compressed pixel and a difference value between the original pixel and the neighboring pixel.

An apparatus for recovering a compressed motion picture, comprising:

• an image decoding unit for outputting an information with respect to an image which will be recovered, a quantized variable, a macro block type, and a motion type by decoding a coded image signal;
• and
• a block process eliminating filter for defining a cost function based on a smoothing degree of an image and a reliability with respect to an original pixel in consideration of a directional characteristic between a neighboring pixel and the pixel which will be processed based on the pixels which will be recovered using an information with respect to the image which will be recovered inputted from the image decoding unit, and adaptively searching a regularization parameter variable which has a weight of a reliability with respect to the original image from each cost function and a weight of a smoothing degree of the original image for thereby recovering an original pixel,
• wherein said regularization parameter variable is a weight value with respect to reliability and is determined based on a difference between the original pixel and the compressed pixel and a difference value between the original pixel and the neighboring pixel.

A method of filtering an image, comprising:

• checking, with a filter apparatus, whether a first pixel to be filtered is in an intra-coded portion of an image and whether a neighboring pixel is in the intra-coded portion of the image;
• selecting, with the filter apparatus, a filtering method having a filtering strength based on a result of the checking step, the selected filtering method adjusting a degree of filtering based on a difference value, the difference value being based on the pixel being filtered and a neighboring pixel;
• and
• filtering, with the filter apparatus, the first pixel with the filtering method.