Most contemporary neuron tracing systems are semi-automatic; that is, an operator follows neuron branches in a microscope or on a data tablet and instructs a computer when to record a spatial sample. A list of such samples is then used to generate a display of the neuron and to summarize statistically its structure. The tracing is tedious, and the operator… (More)
A system of programs for building three-dimensional models of biological structures was developed. Outlines of features such as cells, tissue edges, and neuron pathways are traced into a computer from tissue sections mounted on a light microscope or projected onto a data tablet. The three-dimensional models are built from a series of the two-dimensional… (More)
A hard copy capability was needed for the CRT of a PDP-11/LDS-2 graphics facility. Available hardware was inconvenient or unsatisfactory for several reasons. An Hewlett-Packard 7210 A Digital Plotter was selected and an interface from standard line generator format to the plotter was designed and built. The results are a fast, quiet, high-quality hard copy… (More)
The Neuroscience Display Processor (NDP) has been developed at the University of North Carolina for displaying two- and three-dimensional structures, and two-dimensional graphs. To make easy the displaying of graphs and other drawings on a refresh CRT or on a digital plotter, a subroutine package has been produced for the scientist programming in FORTRAN.… (More)
Computer graphics displays in the neurosciences are classified into three categories: anatomical structures, physiological waveforms, and statistical summaries. The capabilities required in a line drawing system to present neuroscience displays are smooth rotation and translation of 3D structures, simple line rejection, orthographic projection, and flexible… (More)
A PDP-11/34 laboratory computer, a Quantimet image analyzer, and a research light microscope with motorized X, Y stage and focus axis are used for "semi-automatic" neuron reconstruction. The operator examines each neuron tree through the microscope eyepieces, commands the Quantimet system to move the stage and focus the optics, and when a point along the… (More)
After five years of experience meeting neuroscientists' display requirements, a university computer center constructed a low-cost, special-purpose, highly successful graphics processor.