## Directional Filtering Transform for Image/Intra-Frame Compression (2010)

### BibTeX

@MISC{Peng10directionalfiltering,

author = {Xiulian Peng and Jizheng Xu and Feng Wu},

title = {Directional Filtering Transform for Image/Intra-Frame Compression},

year = {2010}

}

### OpenURL

### Abstract

While directional adaption is introduced into traditional transforms, different orders of two 1-D transforms will result in different results of one 2-D transform. Based upon an anisotropic image model, this paper analyzes the effect of transform orders in terms of theoretical coding gain. Our results reveal that the transform orders have little effect on the coding gain with full decomposition, good directional modes and good interpolation. However, in practical compression schemes, since high-pass bands are not decomposed fully because of the consideration on complexity, different transform orders have different coding performances, which can be solved by an adaptive transform order. Motivated by our analyzed results, a directional filtering transform (dFT, in order to distinguish from the common usage on DFT) is proposed in this paper to better exploit correlations among samples in H.264 intraframe coding. It provides an evenly distributed set of prediction modes with an adaptive transform order. Both interblock and intrablock correlations are exploited in this scheme. Experimental results in H.264 intraframe coding demonstrate its superiority both objectively and subjectively.

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Citation Context ...ieee.org. Digital Object Identifier 10.1109/TIP.2010.2049242 formation of images in the frequency domain [1]–[9]. Some attempts on applying these transforms to image compression have been reported in =-=[7]-=-–[9] and [31]. The main challenge for them is that coefficients after these transforms hardly use existing mature quantization and entropy coding methods. On the other hand, some methods are proposed ... |

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Citation Context ...iltering transform (dFT, in order to distinguish from the common usage on DFT) to better exploit image and intraframe correlations in H.264 intraframe coding. Some preliminary results are reported in =-=[32]-=-. dFT consists of directional filtering and an optional DCT. In the directional filtering, there are two different modes. One is the unidirectional filtering (UDF), similar to H.264 intra prediction. ... |

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