Emil Dumic

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• PhD
• Professor (Associate) at University North

In this paper we will present a new dynamic point cloud compression based on different projection types and bit depth, combined with the surface reconstruction algorithm and video compression for obtained geometry and texture maps. Texture maps have been compressed after creating Voronoi diagrams. Used video compression is specific for geometry (FF...

This article describes an empirical exploration on the effect of information loss affecting compressed representations of dynamic point clouds on the subjective quality of the reconstructed point clouds. The study involved compressing a set of test dynamic point clouds using the MPEG V-PCC (Video-based Point Cloud Compression) codec at 5 different...

This paper presents a summary of recent progress in compression, subjective assessment and objective quality measures of point cloud representations of three dimensional visual information. Different existing point cloud datasets, as well as discusses the protocols that have been proposed to evaluate the subjective quality of point cloud data. Seve...

This meta-survey provides a comprehensive review of 3D point cloud (PC) applications in remote sensing (RS), essential datasets available for research and development purposes, and state-of-the-art point cloud compression methods. It offers a comprehensive exploration of the diverse applications of point clouds in remote sensing, including speciali...

The incorporation of live examples of different tasks within a computer vision (CV) course offers multifaceted learning opportunities. This study delves into the educational advantages derived from such an exercise. By engaging in the development of different computer vision systems, students gain practical experience in applying fundamental comput...

The paper investigates the usage aspects of ChatGPT (version 3.5) in STEM and computing-related education processes - more precisely, we concentrate on an elective course offered to our students - Introduction to Web Programming. In this course, our students learn the basics of client/front-side web programming (using HTML5, CSS3, and plain JavaScr...

This paper presents a face detection and recognition system utilizing a Raspberry Pi computer that is built on a predefined framework. The theoretical section of this article shows several techniques that can be used for face detection, including Haar cascades, Histograms of Oriented Gradients, Support Vector Machine and Deep Learning Methods. The...

Students in STEM fields often need to propose and develop programming solutions of different levels of complexity, for various scientific, technical, and engineering problems. In order to solve such tasks, they must have sufficient general programming skills and the knowledge of some standard programming language, such as C/C++, C#, Python, Java, K...

In this work we compare two different options to perform on-line subjective quality assessment experiments in the context of the Call for Evidence on JPEG Pleno Point Cloud Coding. A deep-learning based point cloud codec submitted to the Call was tested against current MPEG point cloud compression methods. The first option is based on participants...

This paper presents a fast and lightweight image inpainting method using distance transform and Gaussian lowpass filtering on disoccluded regions for virtual view synthesis. Virtual views are created from one texture-plus-depth image and afterwards a described method is used for the hole filling process. Proposed algorithm is compared with several...

This article proposes a new method for subjective 3D video quality assessment based on crowdsourced workers—Crowd3D. The limitations of traditional laboratory-based grade collection procedures are outlined, and their solution through the use of a crowd-based approach is described. Several conceptual and technical requirements of crowd-based 3D vide...

In this paper we present a novel no-reference video quality measure, NR-FFM (no-reference frame–freezing measure), designed to estimate quality degradations caused by frame freezing of streamed video. The performance of the measure was evaluated using 40 degraded video sequences from the laboratory for image and video engineering (LIVE) mobile data...

Recently stakeholders in the area of multimedia representation and transmission have been looking at plenoptic technologies to improve immersive experience. Among these technologies, point clouds denote a volumetric information representation format with important applications in the entertainment, automotive and geographical mapping industries. Th...

Theory of electromagnetic waves is usually covered to a lesser extent within courses of physics for first year students of electrical engineering. Teaching higher education courses of more complex analysis of EM wave propagation which is meant for senior students, specially those of radio communications, imposes some challenges for professors becau...

The SC29/WG1 (JPEG) Committee within ISO/IEC is currently working on developing standards for the storage, compression and transmission of 3D point cloud information. To support the creation of these standards, the committee has created a database of 3D point clouds representing various quality levels and use-cases and examined a range of 2D and 3D...

Traditionally, the quality of a multimedia system was mainly assessed through the evaluation of its Quality of Service (QoS) that is by evaluating system parameters such as bandwidth, latency, jitter, throughput, transmission delay, availability, etc. However, these metrics often failed to capture the actual end-user perceived quality, which has pr...

This chapter presents an overview of different tools used in research and engineering of 3D video delivery systems. These include software tools for 3D video compression and streaming, 3D video players, and their interfaces. Other types of tools widely used in research studies and development of new networking solutions, such as network simulators,...

This chapter describes different video transport technologies that support the existing 3D video formats, such as frame-compatible side-by-side and multi-view video plus depth. Particular emphasis is given to the DVB systems (terrestrial, satellite, and cable) and IP transport, focusing HTTP/TCP streaming, adaptive HTTP streaming, RTP/UDP streaming...

Point clouds have been gaining importance as a solution to the problem of efficient representation of 3D geometric and visual information. They are commonly represented by large amounts of data, and compression schemes are important for their manipulation transmission and storing. However, the selection of appropriate compression schemes requires e...

Point clouds are one of the most promising technologies for 3D content representation. In this paper, we describe a study on quality assessment of point clouds, degraded by octree-based compression on different levels. The test contents were displayed using Screened Poisson surface reconstruction, without including any textural information, and the...

In this paper we present a new method for classification of image degradation type based on Riesz transform coefficients and Blind/Referenceless Image Spatial Quality Evaluator (BRISQUE) that employs spatial coefficients. In our method we use additional statistical parameters that give statistically better results for blur and all tested degradatio...

This paper presents a research study on the subjective assessment of 3D video quality using a newly constructed 3D video database (3DVCL@FER). This database consists of 8 original 3D video sequences, each degraded with 22 different degradation types, including degradations specific to stereoscopic systems. The subjective assessment was done with th...

This paper presents a new 3D video database (STESCAL3D -Stereoscopic Scalable 3D), made up of 3D stereo video sequences affected by different types of degradations. A set of subjective quality grades have been collected in three geographically displaced sites. The database contents have been produced using scalable video coding to encode 3D stereo...

In this paper we analyzed possible capacity gains in transition from DVB-T to DVB-T2 standard. We compared minimum C/N ratio needed for quasi error free reception of DVB-T and DVB-T2 systems with similar transmitting parameters currently used in Croatia. C/N was calculated using simulations developed in Matlab for those standards, in three commonly...

On 31 December 2010 analogue television in Croatia was completely switched off and was replaced by DVB-T television standard. Because of that, it became possible to provide more TV programs with higher quality and it freed up the frequency band for first digital dividend, which is now used for LTE mobile broadband services. Nowadays, newer and more...

In this work we present a study on the performance of existing state of the art 2D objective image and video quality measures, tested on the new 3D stereoscopic video NAMA3DS1-COSPAD1 database. Different image and video quality measures have been tested on test material affected by different types of degradations. Results show that in some cases, i...

In this paper, we present a new full-reference objective image quality measure-IQM2, based on structural similarity index and steerable pyramid wavelet transform. IQM2 is tested using different number of orientation kernels and seven subjective databases. Finally, IQM2 measure is compared with twelve commonly used full-reference objective measures....

In this study we analyze the correlation between different image and video quality measures and corresponding subjective scores computed on 20 3D texture+depth video sequences from the University of Coimbra 3D (UC3D) video database. Quality metrics were tested on (degraded) depth information and synthesized views. The results show that in the case...

Mobile users today expect wide range of multi­ media services to be available in different mobility sce­ narios, and among the others is mobile TV service. The Digital Video Broadcasting – Satellite services to Hand­ held (DVB­SH) is designed to provide mobile TV services, supporting a wide range of mobile multimedia services, like audio and data b...

This paper describes a crowdsourced subjective video quality method which evaluates various degradation types including wireless packet losses, transmission errors and compression artefacts. In recent times crowdsourcing gained a lot of momentum in various fields. The crowdsourcing method could be used in situations where a larger set of results is...

In this paper, we present the measurement of the signal transmitted in the second generation digital terrestrial television standard in urban area. The transmitter was located at the Sljeme hill in Zagreb, Croatia and measurements were carried out at different locations in the city of Zagreb, Croatia. The channel power, the constellation graph and...

In this paper we present new reduced video quality measure (RVQM) based on 3D steerable wavelet transform and modified SSIM (Structural Similarity index) measure. RVQM is compared with other full and reduced reference quality measures and tested on LIVE video and LIVE mobile databases. Results show that proposed RVQM measure provides good correlati...

In this paper we present new image quality database VCL@FER (http://www.vcl.fer.hr/quality/) which consists of four degradation types, 6 levels of each degradation and 23 different images (552 degraded images). It can be used in objective image quality evaluation, as well as to develop and test new image quality measures. Results for six commonly u...

This paper presents simulation environment that includes transmission channel models from the ETSI standard EN 300 744 (DVB-T system) and channel models based on real measured parameters. Our simulation includes transmitter and receiver, supports different system parameters (modulation, code rate, guard interval) and channel models. It is adaptive...

This paper describes a simulation and measurement of digital television signal transmission according to the DVB-T2 standard in Single-Frequency Networks (SFN) over few models of the fading channels. Simulation was done using a software implementation of the DVB-T2 standard with parameters defined for the DVB-T2 test signal that is transmitted in C...

In this paper we present the modified SSIM (SSIMmod) and simplified SSIM (SSIMsimpl) measures and compare them with 3 objective measures (MSE, original SSIM and VIF). Objective measures are compared using 7 publicly available subjective image quality databases and 3 correlation types (Pearson's, Spearman's and Kendall's correlation). Results show t...

This paper analyzes the performance of a new DVB-S2 system. The standard outer Bose-Chaudhuri-Hoquenghem encoder is substituted with a Reed-Solomon (204, 188) encoder in order to analyze and possibly improve the system performances. Simulation for analyzing the communication quality is designed via Matlab and Simulink. The results are compared with...

In this paper we present new approach to the objective image quality evaluation based on discrete wavelet transform (DWT) and particle swarm optimization (PSO). DWT was applied on image difference (difference between original and degraded image) that is decomposed into approximation and detail subbands. DWT coefficients were computed using Coiflet...

In this paper we present new image quality database which consists of four degradation types: JPEG, JPEG2000, White noise and Gaussian blur. Results for five commonly used objective quality measures are compared using newly developed image database, as well as LIVE image database. Subjective image quality assessment (IQA) is based on subjective exp...

Image quality assessment is a challenging task that is traditionally approached by computational models. To maintain, control, and enhance the quality of images, it is important for image acquisition, management, communication, and processing systems to be able to identify and quantify image quality degradations. A great deal of effort has been mad...

This paper presents simulation model for DVB-T system following the ETSI standard EN 300 744. Simulation model includes DVB-T transmitter and receiver, supports different system parameters and transmission channels. The model provides overall evaluation of DVB-T system parameters and can be used for educational and testing purposes.

In this paper we compare some of the objective quality measures with subjective, in several HDTV formats, to be able to grade the quality of the objective measures. Also, comparison of objective and subjective measures between progressive and interlaced video signal will be presented to determine which scanning emission format is better, even if it...

We present an innovative approach to the objective quality evaluation that could be computed using the mean difference between the original and tested images in different wavelet subbands. Discrete wavelet transform (DWT) subband decomposition properties are similar to human visual system characteristics facilitating integration of DWT into image-q...

We present an innovative approach to the objective quality evaluation that could be computed using the mean difference between the original and tested images in different wavelet subbands. Discrete wavelet transform (DWT) subband decomposition properties are similar to human visual system characteristics facilitating integration of DWT into image-q...

There is a large number of different video compression formats being used for various purposes today. These formats differ between each other in possibility of achieving suitable bitrates while maintaining acceptable image quality. Current video compression standards offers the possibility of different sampling rate for the luminant and the chromin...

Digital video braodcasting requires high image quality, keeping the bitrate as low as possible at the same time. In the digital photography, new image compression standard named JPEG2000 proves to be more efficient than JPEG in subjective evaluation. JPEG2000 uses discrete wavelet transform (DWT) while JPEG uses discrete cosine transform (DCT). In...

Digital mammography allows detection of breast abnormalities in early stage of breast cancer development. One of the abnormalities that may indicate breast cancer in its early stage is bilateral asymmetry. This paper presents computer-aided detection algorithm for bilateral asymmetry that uses B-spline interpolation for breast alignment. Alignment...

The continuous growth of digital video industry driven by constant improvements in digital processing technology has stimulated today’s broadcasters to start a new transition.This newtransition toward better, high definition television system will introduce and offer the audience a true, realistic experience of a perceived high resolution video con...

In this paper we compare some of the objective quality measures with subjective, in several HDTV formats, to be able to grade quality of objective measures. Also, comparison of objective and subjective measures between progressive and interlaced video signal will be presented to check which scanning emission format is better, even if it has differe...

This article provides results of subjective and objective measurements of video quality in HDTV systems. Picture quality in a compressed system can change dynamically based on a combination of data rate, picture complexity, and the encoding algorithm employed. Current HDTV formats, 720p/50, 1080i/25, 1080p/50 compressed with H.264/AVC codec were ex...

When comparing different interpolation methods, common approach is to use an objective image quality measure that evaluates the numerical errors between the original image and interpolated image. The problem with this approach is impossibility to have original image in two or more different resolutions. Common method is to start with an original im...

Picture quality measures should show how some new interpolation method performs in comparison with other interpolation methods. For the case of magnified image achieved by interpolation, original image is unknown and there is no perfect way to judge the magnification quality. Common approach is to start with an original image, generate a lower reso...

Discrete wavelet transform (DWT) can be used in various applications, such as image compression and coding. In this paper we examine how DWT can be used in image interpolation. Afterwards proposed method is compared with other traditional interpolation methods. Results show that proposed method yields better image interpolation performance compared...

Discrete wavelet transform (DWT) can be used in various applications, such as image compression and coding. In this paper we examine how DWT can be used in image interpolation. Afterwards proposed method is compared with two other traditional interpolation methods. For the case of magnified image achieved by interpolation, original image is unknown...