Francisco Abad

Learn More
We present a simple calibration method for computing the extrinsic parameters (pose) and intrinsic parameters (focal length and principal point) of a camera by imaging a pattern of known geometry. Usually, the patterns used in calibration algorithms are complex to build (three orthogonal planes) or need a lot of features (checkerboard-like pattern). We(More)
Omni-directional video (ODV) is a novel medium that offers viewers a 360º panoramic recording. This type of content will become more common within our living rooms in the near future, seeing that immersive displaying technologies such as 3D television are on the rise. However, little attention has been given to how to interact with ODV content. We(More)
This paper presents a methodology for integrating synthetic objects into real scenes. We take a set of photographs of the real scene and build a simple image-based model. We use high dynamic range images to build an accurate representation of the lighting in the scene. Then we insert a synthetic object into the model and compute its illumination and shading(More)
Autostereoscopic displays are a subject of recent research efforts in Computer Graphics. Such displays have to be fed graphics information in order to produce spatial images. This information is typically 4D radiance data called a light field. Traditionally light-field models were based on the two-plane parameterization. In this paper, however, we present a(More)
In a per-object classification system, many authors have advised a two-step process: First by obtaining small, homegeneous objects, second by merging those regions. In this paper, we present a new method to decide whether two regions belong to the same class or not. An extension of Chang and Li's method of adaptive region-growing is proposed, in order to(More)
The goal of multimodal user interfaces is to assist users in completing tasks quicker or with fewer errors, by reducing their cognitive workload. Visual, auditory and tactile feedback modalities are commonly used as a means to provide users with information through different sensory channels. Understanding how visual, auditory and tactile feedback(More)