Problem using image grabbing in loop

Hi,
We're currently building a machine vision application using 4 cameras at the same time and tried to implement some sort of passthru of all 4 by using a while loop with inside it a sequence to switch channels and grab the images. Somehow this only gives us completely weird images with several black lines through them. It looks like something to do with other system activity because when you move windows or use other programs it gets worse. However, that must be something I'm doing wrong, working on a P4 1.5GHz...
If someone could give me a hint or has any ideas, they would be very welcome.
Thanks

Are you reading the images from a buffer or directly from the device? It's possible you're doing software timed acquisition which is not reliable -- you are at the mercy of Windows and the software speed to properly acquire your images.
Without a small example it's difficult to determine the cause of the problem....
Chris_Mitchell
Product Development Engineer
Certified LabVIEW Architect

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2) Create a directory from sql as system
===============================
SQL> create directory IMGDIR as '/images';
Directory created.
3) Try to load the "test.gif" file but get a non-existent file or directory failure
==================================
DECLARE
-- applicaition variables
Image ORDSYS.ORDImage;
ctx RAW(4000) :=NULL;
BEGIN
DELETE FROM emp WHERE ename = 'John Doe';
INSERT INTO emp VALUES
('John Doe'
, 24000
, 'Technical Writer'
, 123
, ORDSYS.ORDImage(ORDSYS.ORDSource(empty_blob(), NULL,NULL,NULL,SYSDATE,1),
NULL,NULL,NULL,NULL,NULL,NULL,NULL)
, ORDSYS.ORDImage(ORDSYS.ORDSource(empty_blob(), NULL,NULL,NULL,SYSDATE,1),
NULL,NULL,NULL,NULL,NULL,NULL,NULL));
-- select the newly inserted row for update
SELECT photo INTO Image FROM emp
WHERE ename = 'John Doe' for UPDATE;
-- This example imports the image file test.gif from the IMGDIR
-- directory on a local file system.
Image.setSource('FILE','IMGDIR','test.gif');
Image.import(ctx);
--END;
-- set property attributes for the image data
Image.setProperties;
UPDATE emp SET photo = Image WHERE ename = 'John Doe';
COMMIT;
-- continue processing
END;
SQL> /
DECLARE
ERROR at line 1:
ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "ORDSYS.ORDSOURCE", line 183
ORA-22285: non-existent directory or file for FILEOPEN operation
ORA-06512: at "ORDSYS.ORDIMG_PKG", line 484
ORA-06512: at "ORDSYS.ORDIMAGE", line 175
ORA-06512: at line 26
null

This error occured because the user who ran the PL/SQL script did not have the privilege to read the IMGDIR directory.
You can give the privilege to the user as SYSTEM:
SQL> grant read on directory IMGDIR to user;
Then the user should be able to find the IMGDIR directory and run the PL/SQL script without the error.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by niallmcp ():
Can anyone see what I'm doing wrong here ?
I'm sure it's something obvious but I can't see it.
2) Create a directory from sql as system
===============================
SQL> create directory IMGDIR as '/images';
Directory created.
SQL> /
DECLARE
ERROR at line 1:
ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "ORDSYS.ORDSOURCE", line 183
ORA-22285: non-existent directory or file for FILEOPEN operation
ORA-06512: at "ORDSYS.ORDIMG_PKG", line 484
ORA-06512: at "ORDSYS.ORDIMAGE", line 175
ORA-06512: at line 26
<HR></BLOCKQUOTE>
null

Finder not showing camera, Image Grab sees it

Hey,
I have a Canon EOS 400D, but when I plug it in via USB it fails to show up in Finder.
I can grab the images from the camera using Image Grab, so OS X definitely sees it -- just for some reason, it's not showing up on the Desktop or in the Finder sidebar, as other cameras (or flash disks, iPods, etc) do.
Any thing I can do to make it show up?
Thanks!
--Public.

I don't know about that model specifically, but for a camera to appear in the "Finder", it must be able to function as a "mass storage" device. I get the impression that many Canon cameras do not support this mode...

Get newest image when using IMAQdx grab

Hi everone!
I have a problem. I use IMAQdx grab.vi to capture image from camera usb. it has 30 fps. I want to get newest image, which camera acquired. but I realize that IMAQdx grab.vi copys sequent image out of buffer. I simulate a moving rectangle. then I use camera to positive object. I alway receive position of object from camera delay 3 frame.I expect it to delay 1 frame. I attached my program. I want to configure camera to grab the newest image.
Thank in advance!
Attachments:
MAIN.vi ‏204 KB

The cleanest way to accomplish what you are trying to do uses the low-level functions. The Get Image VI will automatically pull the next buffer available, but can also be configured to pull the most recently acquired buffer or any buffer of your choosing. You can see the function's context help for more details.
Also, if you are unfamiliar with using the low-level functions there is a very good example in the example finder called "Low-Level Grab" in the IMAQdx section.
Christopher S. | Applications Engineer
Certified LabVIEW Developer
"If in doubt... flat out." - Colin McRae

Problem using image grabbing in loop

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