Image Reconstruction: Backprojection & Fourier
Backprojection
This section demonstrates a basic backprojection algorithm for image reconstruction.
Steps:
- Determine the dimensions of the sinogram:
[numOfParallelProjections, numOfAngularProjections] = size(sinogram);- Initialize a matrix for the backprojected image (BPI):
BPI = zeros(numOfParallelProjections);
d = numOfParallelProjections * sind(45);
c = d * 2;
dim_pad = ceil((c - numOfParallelProjections) / 2);- Calculate the padded image dimensions:
padded_dim = numOfParallelProjections + 2 * dim_pad;Realistic Vray Rendering Techniques for Interiors and Exteriors
This is a scene that I did for a presentation about exterior lighting, and I would like to share the making of this scene with you. The scene is available for download; see more info at the end.
First, about modeling: for the structure, it was simply easy, just boxes with the help of Edit Poly tools. The most difficult to create was the furniture used in the scene; I did it with the help of ZBrush and Photoshop. The trees and plants were made with Speedtree and the Ivy plugin.
The grass was a simple
Read MoreHotel Security: Protecting Assets and Guests
Principles of Hotel Security
Overall framework for action: A hotel is a tourist company; the purpose is accompanying the hotel business.
- People travel.
- Concentration and free movement of persons: The same number of clients and threats enter. It is difficult to protect the filter.
- Currency, jewelry, cards, etc.: Large concentration of values.
- Events, conferences, tours.
- Socially relevant and famous people (here, also the safety of the occupants of the hotel).
- Unknown and known loss.
- Need for many staff and
Navarre’s Architectural Gems: Moneo and Sáenz de Oiza
Navarre’s Contemporary Architects: Moneo and Sáenz de Oiza
Sáenz de Oiza: An Eclectic Vision
Sáenz de Oiza’s architecture is notable for its eclecticism, earning him the reputation of “an architect without style.” His work features a unique kind of genius: he transforms styles, rather than copying them, providing a new vision that makes his works original.
- Search for Universal Forms: Oiza’s work is dominated by rigor and accuracy in measurements, emphasizing harmony between elements.
- Stylistic Influences:
Brunelleschi’s Architecture: Pietra Serena and Roman Influence
He constantly used Pietra Serena, a gray stone for walls, contrasting with white plaster. He did not focus so much on color effects, but rather on architectural ones (white is secondary).
The capitals are of a classic character, but not the stems. It is a kind of compound capital with acanthus leaves, heat waves, and eggs, but with a smooth shaft. Brunelleschi used classic elements in a free interpretation and not as a fake.
- Above the capitals are the arches, which modulate quite abundantly and with
Essential Flight Line Operations: Safety, Service, and Efficiency
Essential Flight Line Activities
What are some activities that take place on the flight line?
Fueling, repositioning aircraft, line maintenance (sometimes), aircraft servicing (lavatory, pre-heat, cleaning, etc.), and passenger transportation.
The Importance of the Flight Line
It is generally the first impression your customer will have of your operation.
Key Aspects of a Well-Managed Flight Line
- Courteous personnel, regardless of pilot
- Prompt service: Have aircraft fueled and ready (i.e., preheated)
- Efficient