An Efficient Frame Packing Method for Icosahedral Projection in 360 Video Coding

Kim, Hyunho; Yoon, Yong-Uk; Kim, Jae-Gon

doi:10.5573/ieiespc.2018.7.3.195

Cited by 2 publications

(4 citation statements)

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“…Yoon et al propose a technique for SSP [3] with bitrate reductions of 0.3%. Kim et al propose a suitable technique when introducing the icosahedron projection [4].…”

Section: Inactive Regions In 360 • Videosmentioning

confidence: 99%

“…In icosahedron projection (ISP), there are 20 triangular faces which are packed in a compact format (CISP). To compact the 20 triangles in a rectangular frame, some triangles are split or flipped vertically or horizontally [4].…”

Section: Ohp Cohpmentioning

confidence: 99%

“…This video data is commonly called 360 • video and overcomes the drawback of classic equilinear sequences, which usually cover less than 180 • of viewing angle horizontally and vertically, in a single point of view. To this end, a high number of different projection formats have been proposed and studied [2,3,4]. The target of a projection format is to optimize the user experience which is measured in terms of the visually perceived quality, independent from the viewing angle [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient Coding of 360° Videos Exploiting Inactive Regions in Projection Formats

Herglotz

Jamali

Coulombe

et al. 2019

2019 IEEE International Conference on Image Processing (ICIP)

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This paper presents an efficient method for encoding common projection formats in 360 • video coding, in which we exploit inactive regions. These regions are ignored in the reconstruction of the equirectangular format or the viewport in virtual reality applications. As the content of these pixels is irrelevant, we neglect the corresponding pixel values in ratedistortion optimization, residual transformation, as well as inloop filtering and achieve bitrate savings of up to 10%.

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“…Yoon et al propose a technique for SSP [3] with bitrate reductions of 0.3%. Kim et al propose a suitable technique when introducing the icosahedron projection [4].…”

Section: Inactive Regions In 360 • Videosmentioning

confidence: 99%

Section: Ohp Cohpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Coding of 360° Videos Exploiting Inactive Regions in Projection Formats

Herglotz

Jamali

Coulombe

et al. 2019

2019 IEEE International Conference on Image Processing (ICIP)

View full text Add to dashboard Cite

show abstract

“…Thus, a variety of mapping methods with less distortion and pixel wasting have been proposed [ 34 , 35 , 36 , 37 ]. Although a tremendous number of studies have been conducted for 360° videos [ 38 , 39 , 40 ], the standardization activities for a quality assessment of 360° images are limited.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of 360° Image Projection Formats; Comparing Format Conversion Distortion Using Objective Quality Metrics

Hussain

Kwon

2021

J. Imaging

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Currently available 360° cameras normally capture several images covering a scene in all directions around a shooting point. The captured images are spherical in nature and are mapped to a two-dimensional plane using various projection methods. Many projection formats have been proposed for 360° videos. However, standards for a quality assessment of 360° images are limited. In this paper, various projection formats are compared to explore the problem of distortion caused by a mapping operation, which has been a considerable challenge in recent approaches. The performances of various projection formats, including equi-rectangular, equal-area, cylindrical, cube-map, and their modified versions, are evaluated based on the conversion causing the least amount of distortion when the format is changed. The evaluation is conducted using sample images selected based on several attributes that determine the perceptual image quality. The evaluation results based on the objective quality metrics have proved that the hybrid equi-angular cube-map format is the most appropriate solution as a common format in 360° image services for where format conversions are frequently demanded. This study presents findings ranking these formats that are useful for identifying the best image format for a future standard.

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An Efficient Frame Packing Method for Icosahedral Projection in 360 Video Coding

Cited by 2 publications

References 0 publications

Efficient Coding of 360° Videos Exploiting Inactive Regions in Projection Formats

Efficient Coding of 360° Videos Exploiting Inactive Regions in Projection Formats

Evaluation of 360° Image Projection Formats; Comparing Format Conversion Distortion Using Objective Quality Metrics

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