Archive for September 16th, 2011

September 16, 2011

Bokode

bokode

A bokode is a type of data tag which holds thousands of times more information than a barcode. They were developed by a team at the MIT Media Lab. The bokode pattern is a tiled series of Data Matrix codes. The name is a portmanteau of the words bokeh (a photographic term) and barcode – rewritable bokodes are called bocodes. They are much smaller than a barcode and are circular in shape with a diameter of 3mm. A bokode consists of an LED covered with a mask and a lens. They are readable from different angles and from 4 meters (13 feet) away by an SLR camera.

Currently they are expensive to produce as the LED requires power, but there are prototypes which manage with reflected light. Bokodes represent a privacy advantage compared to Radio-frequency identification tags (RFID): bokodes can be covered up, whereas active as well as passive RFID tags can be read from a distance with equipment that can receive radio signals.

September 16, 2011

Bokeh

bokeh

In photography, bokeh [boh-kay] is the blur, or the aesthetic quality of the blur, in out-of-focus areas of an image, or ‘the way the lens renders out-of-focus points of light.’ Differences in lens aberrations and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting—’good’ and ‘bad’ bokeh, respectively. Bokeh occurs for parts of the scene that lie outside the depth of field. Photographers sometimes deliberately use a shallow focus technique to create images with prominent out-of-focus regions.

Bokeh is often most visible around small background highlights, such as specular reflections and light sources, which is why it is often associated with such areas. However, bokeh is not limited to highlights; blur occurs in all out-of-focus regions of the image.

read more »