Method of coding artifacts reduction

• US 7,352,916 B2
• Filed: 08/11/2005
• Issued: 04/01/2008
• Est. Priority Date: 11/27/2000
• Status: Expired due to Fees

• Current Assignee: Sony Deutschland GmbH (Sony Group Corp.)
• Original Assignee: Sony Deutschland GmbH (Sony Group Corp.)
• Inventors: Estevez, Miguel, Unruh, Christian, Wagner, Peter
• Primary Examiner(s): KASSA, YOSEF
• Application Number:
  US11/202,612
• Publication Number:
  US 20050265623A1
• Time in Patent Office: 964 Days
• Field of Search: 382/260, 382/274, 382/275, 382/261, 382/233, 382/235, 382/244, 382/252, 358/3.26, 358/3.27, 358/463
• US Class Current: 382/275
• CPC Class Codes: H04N 19/117 Filters, e.g. for pre-processing or post-processing sub-band filter banks H04N19/635
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/14 Coding unit complexity, e.g. amount of activity or edge presence estimation H04N19/146 takes precedence
• CPC Class Codes: H04N 19/154 Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion use of rate-distortion criteria H04N19/147
• CPC Class Codes: H04N 19/16 for a given display mode, e.g. for interlaced or progressive display mode
• CPC Class Codes: H04N 19/162 User input
• CPC Class Codes: H04N 19/169 characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
• CPC Class Codes: H04N 19/17 the unit being an image region, e.g. an object
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/80 Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation H04N19/635, H04N19/86 take precedence
• CPC Class Codes: H04N 19/86 involving reduction of coding artifacts, e.g. of blockiness

Abstract

A method to reduce coding artifacts within a discrete decoded picture includes a spatial and/or temporal filtering with respective filter characteristics dependent on an image quality value (Q). Preferably, the spatial filtering includes a deblocking filtering, wherein the deblocking filter operation decreases with an increasing image quality value (Q) and/or the deblocking filtering chooses an image quality value (Q) dependent weighting function for a pixel to be filtered according to an activity of both blocks to which common border said pixel belongs.

Claims

1. A method to reduce coding artifacts within a discrete decoded picture, said method comprising the steps of:

spatial and/or temporal filtering with respective filter characteristics dependent on an image quality value;

wherein said image quality value is determined based on a user selection and wherein the temporal filter operation decreases with an increasing image quality value; and

wherein the temporal filter operation is realized with a blending filter applied to an entire frame which determines a new frame as a weighted sum of a predicted frame and an actual frame, which weighting is dependent on said image quality value and a difference of the actual frame with the predicted frame.

2. A method to reduce coding artifacts within a discrete decoded picture, said method comprising the steps of:

spatial and/or temporal filtering with respective filter characteristics dependent on an image quality value;

wherein said image quality value is determined based on a user selection;

wherein the temporal filter operation decreases with an increasing image quality value;

wherein the temporal filter operation is realized with a blending filter applied to an entire frame which determines a new frame as a weighted sum of a predicted frame and an actual frame, which weighting is dependent on said image quality value and a difference of the actual frame with the predicted frame, and

wherein said predicted frame is determined on basis of a motion compensation of a previously determined new frame.

3. A method to reduce coding artifacts within a discrete decoded picture, said method comprising the steps of:

spatial and/or temporal filtering with respective filter characteristics dependent on an image quality value,

wherein said image quality value is determined based on a user selection and wherein said spatial filtering includes a deblocking filtering, and

wherein the deblocking filter operation decreases with an increasing image quality value and

wherein the deblocking filtering chooses an activity-dependent weighting function for a pixel to be filtered according to a image quality value and

wherein the activity of both blocks to which a common border of said pixel belongs is considered.

4. A method to reduce coding artifacts within a discrete decoded picture, said method comprising the steps of:

spatial and/or temporal filtering with respective filter characteristics dependent on an image quality value,

wherein said spatial filtering includes a deringing filtering,

wherein said deringing filter operation decreases with an increasing image quality value and

wherein said deringing filtering chooses a deringing mask dependent on said image quality value, and

wherein said image quality value is determined based on a user selection.

5. A device for picture processing, comprising:

spatial and/or temporal filters with respective filter characteristics dependent on an image quality value,

wherein said image quality value is determined based on a user selection;

wherein the temporal filter operation decreases with an increasing image quality value;

wherein the temporal filter operation is realized with a blending filter applied to an entire frame which determines a new frame as a weighted sum of a predicted frame and an actual frame, which weighting is dependent on said image quality value and a difference of the actual frame with the predicted frame.

6. A device for picture processing, comprising:

spatial and/or temporal filters with respective filter characteristics dependent on an image quality value,

wherein said image quality value is determined based on a user selection;

wherein the temporal filter operation decreases with an increasing image quality value;

wherein the temporal filter operation is realized with a blending filter applied to an entire frame which determines a new frame as a weighted sum of a predicted frame and an actual frame, which weighting is dependent on said image quality value and a difference of the actual frame with the predicted frame;

wherein said predicted frame is determined on basis of a motion compensation of a previously determined new frame.