This paper gives an overview of the viewer application developed for the simulation environment C... more This paper gives an overview of the viewer application developed for the simulation environment Ciber-Rato from its specifications to its pratical implementation. The Ciber-Rato environment consists of a set of applications that simulate a virtual environment and work as a distributed system.
During the past years, the development of microarray technology has been remarkable, and it is be... more During the past years, the development of microarray technology has been remarkable, and it is becoming a daily tool in many genomic research laboratories. The widespread adoption of this technology, coupled with the significant volume of data generated per experiment, in the form of images, have led to significant challenges in storage and query-retrieval. In this paper, we present a lossless bitplane based method for efficient compression of microarray images. This method is based on arithmetic coding driven by image-dependent multi-bitplane finite-context models. It produces an embedded bitstream that allows progressive, lossy-to-lossless decoding. We compare the compression efficiency of the proposed method with three image compression standards (JPEG2000, JPEG-LS and JBIG) and also with the two most recent specialized methods for microarray image coding. The proposed method gives better results for all images of the test sets and confirms the effectiveness of bitplane based met...
Emotion recognition has attracted major attention in numerous fields because of its relevant appl... more Emotion recognition has attracted major attention in numerous fields because of its relevant applications in the contemporary world: marketing, psychology, surveillance, and entertainment are some examples. It is possible to recognize an emotion through several ways; however, this paper focuses on facial expressions, presenting a systematic review on the matter. In addition, 112 papers published in ACM, IEEE, BASE and Springer between January 2006 and April 2019 regarding this topic were extensively reviewed. Their most used methods and algorithms will be firstly introduced and summarized for a better understanding, such as face detection, smoothing, Principal Component Analysis (PCA), Local Binary Patterns (LBP), Optical Flow (OF), Gabor filters, among others. This review identified a clear difficulty in translating the high facial expression recognition (FER) accuracy in controlled environments to uncontrolled and pose-variant environments. The future efforts in the FER field shou...
This paper gives an overview of the viewer application developed for the simulation environment C... more This paper gives an overview of the viewer application developed for the simulation environment Ciber-Rato from its specifications to its pratical implementation. The Ciber-Rato environment consists of a set of applications that simulate a virtual environment and work as a distributed system.
During the past years, the development of microarray technology has been remarkable, and it is be... more During the past years, the development of microarray technology has been remarkable, and it is becoming a daily tool in many genomic research laboratories. The widespread adoption of this technology, coupled with the significant volume of data generated per experiment, in the form of images, have led to significant challenges in storage and query-retrieval. In this paper, we present a lossless bitplane based method for efficient compression of microarray images. This method is based on arithmetic coding driven by image-dependent multi-bitplane finite-context models. It produces an embedded bitstream that allows progressive, lossy-to-lossless decoding. We compare the compression efficiency of the proposed method with three image compression standards (JPEG2000, JPEG-LS and JBIG) and also with the two most recent specialized methods for microarray image coding. The proposed method gives better results for all images of the test sets and confirms the effectiveness of bitplane based met...
Emotion recognition has attracted major attention in numerous fields because of its relevant appl... more Emotion recognition has attracted major attention in numerous fields because of its relevant applications in the contemporary world: marketing, psychology, surveillance, and entertainment are some examples. It is possible to recognize an emotion through several ways; however, this paper focuses on facial expressions, presenting a systematic review on the matter. In addition, 112 papers published in ACM, IEEE, BASE and Springer between January 2006 and April 2019 regarding this topic were extensively reviewed. Their most used methods and algorithms will be firstly introduced and summarized for a better understanding, such as face detection, smoothing, Principal Component Analysis (PCA), Local Binary Patterns (LBP), Optical Flow (OF), Gabor filters, among others. This review identified a clear difficulty in translating the high facial expression recognition (FER) accuracy in controlled environments to uncontrolled and pose-variant environments. The future efforts in the FER field shou...
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Papers by António J. R. Neves