Method and apparatus for image and video processing
AssigneeSony Corporation
InventorsOliver Erdler, Paul Springer, Carsten Dolar, Martin Richter
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Abstract
The present invention relates to an image processing method. The method comprises a step of generating adaptive temporal filter coefficients. Then a recursive filter is applied at least once to an image frame using the generated temporal filter coefficients. The present invention further relates to an apparatus and a computer program product for performing image processing.
Claims32
Image processing method,
- comprising the steps of
- generating adaptive temporal filter coefficients and
- applying a recursive filter at least once to an image frame using the generated temporal filter coefficients.
Method according to any of the preceding claims,
- comprising the step of repeating the filter coefficient generation and the recursive filtering at least once.
Method according to any of the preceding claims,
- wherein the step of generating the adaptive temporal filter coefficients bases on at least one successive and/or at least one preceding frame.
Method according to any of the preceding claims,
- wherein the step of generating the adaptive temporal filter coefficients comprises calculating a temporal difference between a pixel in the current frame under processing and a pixel within at least one previous and/or successive frame and follows the equation
- T
- k
- +
- p
- =
- 1
- c
- 2
- +
- α
- ·
- diff_t
- k
- +
- p
- 2
- ,
- where Tk+p is the temporal filter coefficient, c and α are constants or adaptively generated based on external analysis information and diff_tk+p is the temporal difference between the current frame k and the frame k+p, p being a natural number.
Method according to any of the preceding claims,
- wherein the adaptive temporal filter coefficients are calculated based on at least one motion compensated frame.
Method according to any of the preceding frames,
- further comprising the step of spatially and/or temporally pre-processing the image frame prior to the generation of the filter coefficients.
Apparatus for image processing,
- comprising a temporal weighting factor generator for generating adaptive temporal filter coefficients and
- a regularization filter for applying a recursive filter at least once to an image frame using the generated temporal filter coefficients.
Apparatus for image processing comprising
- means for generating adaptive temporal filter coefficients and
- means for applying a recursive filter at least once to an image frame using the generated temporal filter coefficients.
A computer program product stored on a computer readable medium which causes a computer to perform the steps of
- generating adaptive temporal filter coefficients and
- applying a recursive filter at least once to an image frame using the generated temporal filter coefficients.
Method for reducing compression artifacts in a video signal, comprising the steps of:
- analysing the input image with respect to image areas by an image analyser to obtain image analysis information,
- filtering discontinuous boundaries within the input image, and
- smoothing the filtered image, wherein obtained image analysis information is used in one or both of said steps of filtering and/or smoothing.
Apparatus for reducing compression artifacts in a video signal, comprising
- an image analyser for analysing the input image with respect to image areas to obtain image analysis information,
- a block noise filter for filtering discontinuous boundaries within the input image, and
- a regularizer for smoothing the filtered image,
- wherein said block noise filter and/or said regularizer are adapted for using obtained image analysis information.
Dependencies are inferred from the claim text.