Machine Vision

Introduction to Using Cognex DVT Intellect

Intellect

Use 515 cameras which have CMOS greyscale sensors 640 x 480 pixels.

CCD are more precise and has readers and flaw detection but costs more!

Download from: • http://www.sigavision.com/siga_downloads.html

Intellect Menus

current camera

camera IP address

current working

pane

current software version

image ID display

Intellect shares many menus commonly found in other Windows applications like “File”, “Edit”, “View”, “Window”, and “Help”

Some menu items are unique to Intellect like “Image”, “System”, “Product”, and “System”

Tool Bars

Image Toolbarshow

previous image

(emulation)

show next image

(emulation)

start image cycle

show last inspected

image

stop image cycle

actual size

zoom to fit

zoom in

focus assist

record inspected

images

zoom out

image assist

method selection

enable image assist

set image sequence

Focus assistFocus assist – returns a score (sharpness, intensity and contrast), the higher the better

Image assistImage assist – automatically adjust gain and exposure time

System Toolbar

open Network Explorer

display all camera

connections

open system, product, or image

disconnect from

camera

save system to camera’s

flash

apply white

balance

undo toggle trigger method

(internal/external)

redo run/stop inspection

Product Toolbar

cut product

copy product paste

product

allows product

selection

delete product

toggle antiblooming

activate external LED ring lights

save to camera’s

flash

set exposure

(ms)

create new product

Product Management

Used in conjunction with the properties window to:- Rename Product- Put in a description- Assign Coordinate Transform or Global Scaling- Change the Digital ID of a Product (for digital input selection of product to use)

Tool Toolbar

paste tool

delete tool show tool

properties

allows tool selection

reposition tools

copy tool

cut tool

Toolbox Pane

Camera limitations

510 & 515 do not do Readers or Flexible Flaw detection.

Manual also states 510 does not do positioning or counting but this is probably incorrect!

Pre-processing (Filtering)

Enhance Image Features• Edges

• Defects

Reduce Noise Increase Contrast (image domain) Subtract Background Feature Adds processing time!

Types of Filter Gradient Low pass High pass Sharpen Median Kirsh Convolution

Erode Dilate Open Close Fill Holes FOV Balance Image Domain

Subtract Dark Image Color Inverse Log Edge Aggregate

Convolution

Example from ES372:Spatial-domain: Convolution Mask

Best shown by example:

Convolution mask (3x3)

Image

New value is calculated as:

29111111111

)1201201201201100120120120120(

Sum of matrixSum of product of

both matrices

Positioning Tools

You can find positioning tools by clicking the Positioning header within the Toolbox

There are four positioning tools from which to choose

searches along a line for an edge, feature, or pattern

searches an area for the location of trained feature(s)

searches along an area for a specific edge

finds the center position and the radius of a circle

Counting Tools

CountAlong Line

EdgeCount

Count inArea

PixelCounting

ReplicatorTool

PatternCount

BlobPatternMatch

ObjectLocate

Results used for a Source of Positions to

place another tool, multiple times

FeatureCount

Learn Pixel Intensities

Object locate will probably give the best results

Identification tool

Identifies the part by using multiple leaned models by either Blob properties or Colour properties

Scripting

Like JavaScript Always make comments about what you

are trying to do Reserved words:

• They have special meaning

• Ex. if and PASS End almost all lines with ;

Coordinate Systems

Allows for transforms to be set up for Coordinate Transformations, lens distortion and Tool scaling.

Under systems menu.Great for traditional

robot/camera/world calibration

Camera

(grid) Frame

Robot Frame

+X

+Y

(0,0)

+X

+Y

(0,0)

Coordinate Transformation

Coordinate Systems

Place DVT Target under camera Click “Calibrate” to create a Transform Choose this Transform for your Product