This paper proposes a novel fast intra-prediction algorithm that exploits the Sobel operator to replace the Hadamard transform used in the Rough Mode Decision (RMD) process of intra prediction in High Efficiency Video Coding (HEVC). First, the Sobel operator is used to calculate the vector direction of each pixel. A judgment is then made on which prediction mode the vector belongs to, and a his...

The work herein presented aims at improving the detection of the fovea and optic disk anatomical structures in color fundus photographs from patients with visible lesions. The detection algorithm consists of five steps: selection of an area in the image where the optic disk is located using Sobel operator, extraction of optic disk boundaries applying the Hough transform to detect center and dia...

As a successor to H.264/AVC, High Efficiency Video Coding (HEVC) standard has an outstanding performance than before. To make the coding efficiency higher, one introduced new coding feature in HEVC is adding intra prediction modes up to 35 instead of 9 in H.264, but it increases calculation complexity. To save the coding time, this paper proposes a fast intra mode decision algorithm based on ed...

This paper proposes a novel fast intra-prediction algorithm that exploits the Sobel operator to replace the Hadamard transform used in the Rough Mode Decision (RMD) process of intra prediction in High Efficiency Video Coding (HEVC). First, the Sobel operator is used to calculate the vector direction of each pixel. A judgment is then made on which prediction mode the vector belongs to, and a his...

Edge detection is an important tool in digital image processing applications for extracting information from image. Sobel operator based edge detection algorithm creates an image which highlights edges and transitions. In real-time image processing applications, it is required to process large data of pixels in a given timing constraints. Hence, speed of image processing is a big problem. Recon...

An effective and real-time eyes detection system based on the symmetric and geometric relationships of human-eyes region in gray-level images is presented. In order to reduce the search effort and eliminate the noise impact, we first perform the edge processing with Sobel filter. We then make use of the characteristics of symmetric relationship of human-eyes region to find out the possible regi...

Game theoretical analyses of communication (e.g. Lewis, Crawford & Sobel) demand cooperation between conversational partners for reliable information exchange to take place. Similarly, in pragmatics, the theory of language use, it is standard to assume that communication is a cooperative affair. Recently, this standard view has come under attack by Durcot and Merin, and it has been proposed tha...

Spoken language allows for rich communication, but the message spaces used in most cheap talk models and experiments are usually quite restrictive. I show theoretically that introducing vague messages into a strategic information transmission game a la Crawford and Sobel (1982) increases communication between boundedly rational players if some senders are moderately honest. My model treats vagu...

The Logarithmic Image Processing model (LIP) is a robust mathematical framework for the processing of transmitted and reflected images. It follows many visual, physical and psychophysical laws. This works presents a new formulation of a 2D–convolution of separable kernels using the LIP paradigm. A previously stated LIP–Sobel edge detector is redefined with the new proposed formulation, and the ...

Previous research has demonstrated that causal learning is facilitated by observing interventions on a causal system (e.g., Lagnado & Sloman, 2002). Does the origin of these interventions influence learning? Sobel (2003) demonstrated that causal learning was facilitated when learners observed the results of their own interventions as opposed the results of another’s interventions, even though t...