National Instruments IMAQTM 用户手册

connectivity-4

Only pixels adjacent in the horizontal and vertical directions are considered 
neighbors.

connectivity-8

All adjacent pixels are considered neighbors.

contrast

A constant multiplication factor applied to the luma and chroma 
components of a color pixel in the color decoding process.

convex hull

The smallest convex polygon that can encapsulate a particle.

convex hull function

Computes the convex hull of objects in a binary image.

convolution

.

convolution kernel

2D matrices, or templates, used to represent the filter in the filtering 
process. The contents of these kernels are a discrete two-dimensional 
representation of the impulse response of the filter that they represent.

Danielsson function

Similar to the distance functions, but with more accurate results.

determinism

A characteristic of a system that describes how consistently it can respond 
to external events or perform operations within a given time limit.

digital image

An image f (x, y) that has been converted into a discrete number of pixels. 
Both spatial coordinates and brightness are specified.

dilation

Increases the size of an object along its boundary and removes tiny holes in 
the object.

driver

Software that controls a specific hardware device, such as an IMAQ or 
DAQ device.

edge

Defined by a sharp transition in the pixel intensities in an image or along an 
array of pixels.

edge contrast

The difference between the average pixel intensity before and the average 
pixel intensity after the edge.

edge detection

Any of several techniques to identify the edges of objects in an image.