Nahid Sheikhipour | Tampere University (original) (raw)

Papers by Nahid Sheikhipour

2019 8th European Workshop on Visual Information Processing (EUVIP)

The Moving Picture Experts Group (MPEG) recently has developed a standard for compressing volumet... more The Moving Picture Experts Group (MPEG) recently has developed a standard for compressing volumetric content known as video-based point cloud compression (V-PCC). The V-PCC standard is a multi-layer approach in which the point cloud information is mapped onto multiple image layers. The second layer is considered for including the points that were not projected into the first layer. Even though this dual-layer scheme provides better coding efficiency and reconstruction quality compared to the single-layer approach, but it is considered to be very complex due to high frame rate, memory buffer, execution time, etc. Hence, the single-layer scheme is considered in practical scenarios. This work attempts to improve the coding efficiency and reconstruction quality of the single-layer scheme. The proposed method in this work estimates the most important patches (MIPs) of the second layer and includes them in the patch generation of the first layer. The proposed method provided on average 9.8% and 5.7% bitrate reductions in all intra configuration in different quality metrics when compared to the single-layer scheme. Moreover, the proposed method in random access configuration has reduced the bitrate on average by 8.6% and 4.3% in different quality metrics compared to the single-layer scheme.

APSIPA Transactions on Signal and Information Processing

Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the inter... more Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the interest in representing the real world in an immersive fashion has never been higher. Distributing such representations enables users all over the world to freely navigate in never seen before media experiences. Unfortunately, such representations require a large amount of data, not feasible for transmission on today's networks. Thus, efficient compression technologies are in high demand. This paper proposes an approach to compress 3D video data utilizing 2D video coding technology. The proposed solution was developed to address the needs of “tele-immersive” applications, such as VR, AR, or mixed reality with “Six Degrees of Freedom” capabilities. Volumetric video data is projected on 2D image planes and compressed using standard 2D video coding solutions. A key benefit of this approach is its compatibility with readily available 2D video coding infrastructure. Furthermore, objective and...

APSIPA Transactions on Signal and Information Processing

Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the inter... more Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the interest in representing the real world in an immersive fashion has never been higher. Distributing such representations enables users all over the world to freely navigate in never seen before media experiences. Unfortunately, such representations require a large amount of data, not feasible for transmission on today's networks. Thus, efficient compression technologies are in high demand. This paper proposes an approach to compress 3D video data utilizing 2D video coding technology. The proposed solution was developed to address the needs of “tele-immersive” applications, such as VR, AR, or mixed reality with “Six Degrees of Freedom” capabilities. Volumetric video data is projected on 2D image planes and compressed using standard 2D video coding solutions. A key benefit of this approach is its compatibility with readily available 2D video coding infrastructure. Furthermore, objective and...

2019 8th European Workshop on Visual Information Processing (EUVIP)

The Moving Picture Experts Group (MPEG) recently has developed a standard for compressing volumet... more The Moving Picture Experts Group (MPEG) recently has developed a standard for compressing volumetric content known as video-based point cloud compression (V-PCC). The V-PCC standard is a multi-layer approach in which the point cloud information is mapped onto multiple image layers. The second layer is considered for including the points that were not projected into the first layer. Even though this dual-layer scheme provides better coding efficiency and reconstruction quality compared to the single-layer approach, but it is considered to be very complex due to high frame rate, memory buffer, execution time, etc. Hence, the single-layer scheme is considered in practical scenarios. This work attempts to improve the coding efficiency and reconstruction quality of the single-layer scheme. The proposed method in this work estimates the most important patches (MIPs) of the second layer and includes them in the patch generation of the first layer. The proposed method provided on average 9.8% and 5.7% bitrate reductions in all intra configuration in different quality metrics when compared to the single-layer scheme. Moreover, the proposed method in random access configuration has reduced the bitrate on average by 8.6% and 4.3% in different quality metrics compared to the single-layer scheme.

APSIPA Transactions on Signal and Information Processing

Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the inter... more Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the interest in representing the real world in an immersive fashion has never been higher. Distributing such representations enables users all over the world to freely navigate in never seen before media experiences. Unfortunately, such representations require a large amount of data, not feasible for transmission on today's networks. Thus, efficient compression technologies are in high demand. This paper proposes an approach to compress 3D video data utilizing 2D video coding technology. The proposed solution was developed to address the needs of “tele-immersive” applications, such as VR, AR, or mixed reality with “Six Degrees of Freedom” capabilities. Volumetric video data is projected on 2D image planes and compressed using standard 2D video coding solutions. A key benefit of this approach is its compatibility with readily available 2D video coding infrastructure. Furthermore, objective and...

APSIPA Transactions on Signal and Information Processing

Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the inter... more Due to the increased popularity of augmented (AR) and virtual (VR) reality experiences, the interest in representing the real world in an immersive fashion has never been higher. Distributing such representations enables users all over the world to freely navigate in never seen before media experiences. Unfortunately, such representations require a large amount of data, not feasible for transmission on today's networks. Thus, efficient compression technologies are in high demand. This paper proposes an approach to compress 3D video data utilizing 2D video coding technology. The proposed solution was developed to address the needs of “tele-immersive” applications, such as VR, AR, or mixed reality with “Six Degrees of Freedom” capabilities. Volumetric video data is projected on 2D image planes and compressed using standard 2D video coding solutions. A key benefit of this approach is its compatibility with readily available 2D video coding infrastructure. Furthermore, objective and...