rotation ecran oled

[Hamden]

Hello

I use cvi 2010 and ni vision with a GigE camera to test a screen OLED(small screen):

1-Test pixel (cmptage number of pioxel)

2-Alignment test

I  wants to know what is the function imaq to test the proper positioning of my screen: angle of rotation relative to the Horizental.

I use the fonction:

imaqMeasureParticle (src1, FALSE, TRUE, IMAQ_MT_ORIENTATION, &anglee);

bat the resultas is always 90.

Help please.

[Tim_O1]

Hi Hamden,

There are many different ways of finding the angle of rotation of an object. The easiest way could be to do a pattern match which returns the angle of rotation or you could use straight edge detection to determine the angle. To find the list of all functions go to Start>>Programs>>National Instruments>>Vision>>Documentation. The function for pattern match is CWIMAQPatternMatchReportItem and the straight edge detection is CWIMAQStraightEdge.

LabVIEW Reference:
IMAQ Find Straight Edges 3 VI
http://zone.ni.com/reference/en-XX/help/370281P-01/imaqvision/imaq_find_straight_edges_3/

IMAQ Match Pattern 3 VI
http://zone.ni.com/reference/en-XX/help/370281P-01/imaqvision/imaq_match_pattern_3/

Tim O

[CrisSTine01]

 Hello, 

i'm working on he same subject and i'm finding difficulties on using Labwindows CVI because it's my first time,
In fact i used the function IMAQ Match Pattern and it works but the problem is when the image is rotated the function doesn't fount the pattern i think that the problem is how to define the RotationAngleRange and to initialize angleRanges(upper and lower) I tried this code
RotationAngleRange* angleRanges ;
angleRanges->lower= 0;
angleRanges->upper= 30;
but it doesn't work
FATAL RUN-TIME ERROR: "uptest.c", line 41, col 10, thread id 0x00001BD8: Dereference of uninitialized pointer.

please help me