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Method and device for determining filter coefficients in process of image interpolation
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A filter coefficient and interpolation technology, applied in the field of image coding and decoding, can solve the problem of complex filter coefficients and achieve the effect of improving accuracy
Active Publication Date: 2010-07-28
HUAWEI TECH CO LTD +1
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[0010] In the process of calculating the corresponding filter coefficients in the above way, it is necessary to analyze the similarity of the surrounding image pixels to obtain the similarity function s(f(ε), f(x)), so that the corresponding filter coefficients can be determined The process is more complicated
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Embodiment 1
[0055] In this embodiment, it is considered that filtering along the edge direction or along the low frequency direction can reduce signalcrosstalk than filtering across the edge or along the high frequency direction. Therefore, performing directional filtering on areas with special structures such as edge areas, corners or lines in the image can significantly improve the quality of image filtering or interpolation.
[0056] In this example, if Figure 1A As shown, the corresponding image interpolation process can include:
[0057] Step 11, according to the Gaussianhypothesis, set different deflection angles, that is, set the corresponding angle θ, and calculate a set of filter coefficients according to the positions of the input image pixel points to be interpolated;
[0058] Usually, the setting of corresponding different deflection angles depends on the requirements for accuracy. Specifically, several deflection angles can be uniformly set in the interval [0, π), and the ...
Embodiment 2
[0077] In this embodiment, the correlation of the interpolated pixel points is corrected mainly by using the gradient distribution of the interpolated pixel points around the position to be interpolated, so as to further take advantage of the direction filter to extract the structural information of the pixel, making the interpolation more accurate. to be accurate.
[0078] Specifically, such as figure 2 As shown, the corresponding process of implementing the interpolation operation may include:
[0079] Step 21, calculate the gradient value of each pixel point (that is, the interpolation point) of the input image, correspondingly, the Sobel operator can be used to calculate the gradient, or other methods can also be used to calculate the corresponding gradient.
[0080] Step 22, for the pixel position to be interpolated at position x (i.e. point x to be interpolated), collect N values of existing pixel values in its vicinity as interpolation pixels (i.e. interpolation poi...
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Abstract
The invention relates to a method and a device for determining filter coefficients in the process of image interpolation. The method comprises the following steps of: setting at least one angle of deviation, and calculating at least one filter coefficient according to the angle of deviation; determining the filter coefficients corresponding to interpolation points according to the relation between the gradient vector angles of to-be-interpolated points and the angles of deviation in the at least one filter coefficient, or determining the distance weighting functions and angle weighting functions of the interpolation points first and then determining the filter coefficients corresponding to the interpolation points according to the distance weighting functions and the angle weighting functions; and performing image interpolation according to the filter coefficients of the interpolation points. In the embodiment of the invention, directional information between the interpolation points and the to-be-interpolated points can be considered in the process of interpolation, so that the corresponding directional information can be utilized effectively to determine the filter coefficients and improve the accuracy of the interpolation.
Description
technical field [0001] The invention relates to the technical field of image encoding and decoding, in particular to a method and device for determining filter coefficients in an image interpolation process. Background technique [0002] Image interpolation technology is used in image display, coding and other links. Specifically, it includes: when interpolation is required to obtain the pixel value of a certain position, different weight coefficients (ie, filter coefficients) can be assigned to the existing pixels in the surrounding positions to carry out weighted calculation to obtain the value of the position. Correspondingly, the position to be interpolated may be the position point of some missing pixel values in the input image, or it may also be the position point where the pixel needs to be inserted when the image is enlarged. [0003] According to different ways of calculating the weights of surrounding position pixels, the corresponding image interpolation can b...
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