Measuring blocking artifacts using edge direction information
نویسندگان
چکیده
Block-based transform coding is the most popular approach for image and video compression. The objective measurement of blocking artifacts plays an important role in the design, optimization, and assessment of image and video coding systems. This paper presents a new algorithm for measuring blocking artifacts in images and videos. Instead of using the traditional pixel discontinuity along the block boundary, we use the edge directional information of the images. The new algorithm does not need the exact location of the block boundary thus is invariant to the displacement, rotation and scaling of the images. Experiments on various still images and videos show that the new blockiness measure is very efficient in terms of computational complexity and memory usage, and can produce blocking artifacts measurement consistent with subjective rating.
منابع مشابه
Blocking artifact reduction in compressed images based on edge-adaptive quadrangle meshes
During image deblocking, the preservation of visually significant edges in the image is important. Based on the observation that blocking artifact along edge direction is difficult for human perception, a number of existing techniques have proposed to filter the edge pixels with low weight or bypass them altogether to avoid blurring. However, the un-processed artifacts that are anti-parallel to...
متن کاملA directional deblocking filter based on intra prediction for H.264/AVC
Although the adaptive deblocking filter of H.264/AVC efficiently reduces blocking artifacts for most images, it is limited in removing the blocking artifacts of the directional edge on the block boundaries. In order to solve this problem, we propose a directional deblocking filter based on intra prediction direction. The proposed algorithm performs directional filtering according to the directi...
متن کاملModified De-interlacing method based on edge direction
This paper proposes a de-interlacing method which can detect correct edge directions for interpolation. In the traditional method, the determination of the edge direction is done by only the 2 pixels in that direction. This method sometimes chooses incorrect edge direction. The proposed method adopts 6 pixels in the corresponding direction and an average value is calculated. Since more informat...
متن کاملA No-Reference Blocking Artifacts Metric Using Selective Gradient and Plainness Measures
This paper presents a novel no-reference blocking artifacts metric using selective gradient and plainness (BAM_SGP) measures for DCT-coded images. A boundary selection criterion is introduced to distinguish the blocking artifacts boundaries from the true-edge boundaries, which ensures that the most potential artifacts boundaries are involved in the measurement. Next, the artifacts are evaluated...
متن کاملLocal Blur and Blocking Artifact Detection in Digital Images
In this paper, we will present a novel but simple unified method to locally detect blocking artifact and blur in digital compressed image. Digital images are prone to coding artifacts in terms of blur and blocking artifacts. Each of the distortion mentioned above has different characteristics due to coding scheme applied to the images. We present a local blur and blocking artifact detection bas...
متن کامل