Flicker of image with USB IMAQ vision

Similar Questions

• several webcams in for usb or imaq vision Builder

  Hello

  I have a question about imaq nor for usb or vision builder AI 3.6 (I did a vi with imaq and I run in the constructor of the vision) and I want to know how can I connect multiple webcams to the computer, and how many of them can be connected. can they all be of a make and model and can they be executed with a driver installed on the computer?

  Thank you

  Hello

  In general NOR-IMAQ for USB can support only one camera at a time. You can acquire multiple cameras (not simultaneously) using USB IMAQ list VI cameras to identify each device plugged into your system and access it via the other IMAQ live to USB.

  I would also like to point out that Vision Builder AI does not support the NO-IMAQ for cameras USB driver. It is designed to solve machine vision applications, but USB cameras provide in general or advanced necessary for machine vision triggering modes.  Because the machine vision and USB cameras will usually together, we do support USB cameras in Vision Builder AI.

• How can I import an image with transparent background .png in the Vision Assistant?

  Hello

  I am using the Vision Assistant of NOR. Here, I want to overlay one existing image with another. Therefore, I use the overlay Installer where can I import a .png image. If I do, I don't get

  the transparent background of the back of the image, even, I was saved with a transparent background. The image is displayed with an orange background.

  If I import the same image to any front panel for example, I see the picture on the right path with a transparent background. What I've done wrong? I have attached the image I want to use.

  Thank you

  Hello! Don't know how to do this in the Vision Assistant. Try to use the overlay (bitmap) or convert your image into mask. Effect of transparency not supported in the Vision. What you can do in LabVIEW is something like this:

  

  

• Acquisition of images with 3 USB cameras causing too many uses of the memory/cpu

  Dear experts,

  I'm trying to capture images with 3 cameras USB, located in 3 different positions. I have to initialize each cameras using USB list vi camera when switching between cameras. I realize that, by making this method causing too many uses of the memory/cpu and can cause CPU hang up. If I stop the program, the memory/cpu counter are down.

  Do you know how to reduce this problem.

  Thank you

  Hart

  
  

• IMAQ Vision Image structure

  I currently grabbing an image, using my own equipment and windows messaging and do it in memory as a bitmap image.  How to copy this image in a structure Image IMAQ Vision.  I see other threads that the structure is the owner, but is it possible to copy the raw data in the structure of the Image.  The only way I can achieve this is to write in a BMP file, and then use the () imaqReadFile to read back in. It takes a lot of time, it would be much faster if I could copy from one location to another.

  You can use imaqArrayToImage(), but I've always found this difficult to use function.

  my favorite way is to create a new image of the right size using imaqCreateImage(), then get a pointer to the first pixel using imaqGetImageInfo() and fill pixels directly by copying the data in the buffer of the image. I already showed how to access pixels directly on this forum. You should pay attention to the size of your pixels and the format of the image (RGB, grey levels).

• IMAQ Vision: IO file error

  Hello

  I get the error in the subject, trying to open a file that was acquired from a phone android via the command "adb shell screencap.  I have attached the criterion vi and the image.  I can't seem to find the solution to open this file without error happening on "imaq readfile.  I tried image different types on imaq create and also tried the other way to read that an image file named "imaq read info image and vision.

  I see that I can use the 'imaq getimageinfo' tool to get the parameter image correctly.  I can't get labview to open the image without error, given the tools available.  Help, please.

  P.S. I'm under labview 2013 sp1.

  Thanks in advance,

  David Jenkinson

  Confirmation: Your product-1074395993 code error code when executing "IMAQ ReadFile" during the reading of this png. I don't know what could be the problem with this PNG. To work around the problem, you can use 'Read the PNG file' of the 'Graphics Formats VIs"which doesn't have this problem.

  

• Check the development of an Image with Standard of LABVIEW functions

  Hello

  I want to determine the best quality of the development of a series of color images using features standard LABVIEW, an example my images would be KING of coins in copper or similar sample 2 mm x 1 mm. I do not have the Toolbox IMAQ vision, so this will not be an option. Could someone give me an example of this or point me in the direction I must go. Is it better to check the quality of the focus on the image of color or black and white image or perhaps a representation of the intensity of the image? I heard that the gap checking type of a line of pixels in the image would give a good indication of the quality of the development by seeking the higher SD all images?

  Any help is greatly appreciated!

  Convert the image into an array to IMAQ ImageToArray.

  Extract a single line or row of the table by using the table to Index.  Assuming that your image be U8, these will be U8 values.

  Digital conversion to Double can convert the array of double values.

  Use Rotate 1-d array with an offset of 1 to turn the table.

  Subtract the table of rotation of the rotation matrix.

  Deletion of the table to delete the first element of the array.  It's the difference between the first and last items, which is not desired.

  Absolute value to convert the table of all positive values.

  Use the mean or the standard deviation to measure the development.  I usually have better results with the standard deviation, but sometimes means gives good results also.

  Bruce

• Cannot open RAW Image (binary) u16 in Vision

  Have another question Image U16.  Trying to open a raw U16 image.  Opens in ImageJ with the following options:

  

  I duplicated these settings using this simple code

  

  But I get the error: "error 1074396074 occurred at ReadFile IMAQ.

  Possible reasons:

  IMAQ Vision: inconsistent image size. »

  Image should look like:

  

  I write the file "Martha-1849-02-001-6 - view0000_raw_grey_32bit.raw" ftp://ftp.ni.com/incoming if you want to try.

  Thank you

  Don

  The help says "If you read a non-standard file format, you must set the size of the Image to match the contents of the file before using IMAQ ReadFile".

  Use IMAQ SetImageSize to set the size of 3888 x 3072 and it works.

  -Christophe

• How to download imaq vision

  I am a new user of labview and I wish to study this subject IMAQ vision. However, for the same thing, I have no idea as to how I can use it on LabView. Smoker I don't understand if I have to download additional software for IMAQ Vision work with LabView. Kindly advice me.

  Jean-Luc

  NOR-Vision and NOR-IMAQ are two different things. NOR-IMAQ is a set of drivers and software to acquire, view and save images of some devices. The supported devices are in the readme file. This software is free. NEITHER Vision is a software level. He did work with a wider variety of devices. It is not free.

  I think that it is best to call your local sales office OR that they would be better suited to help you, rather than this forum. We mainly answer technical questions here.

• The USB IMAQ camera driver

  I read a lot of discussion on the issue of the compatibility of driver usb IMAQ and im still looking for a solution for my problem. IAM using labview 2011 on windows 7 and im trying to use a usb webcam in my labview program and it requires to install the camera driver IMAQ us but im having problems with palletes for usb camera. I installed the latest version of the vision acquisition software and I installed the usb driver detected on this link http://zone.ni.com/devzone/cda/epd/p/id/5030 ... Please can someone help me with this problem?

  Hello

  This VI is not the type of the camera. You don't have to replace it.

  The picture I have attached above is an excerpt - This means that you can drag directly on your block diagram and code will be automatically popu...

  ARO

• Lost file "IMAQ Vision example Folder.vi"

  Hello world

  I was working with this file and I lost it. Now, I could not find or fix also I re - install all the modules of the vision, and many examples use this file to take the path of the image to work. Someone can help me trying to find the path and bring me the IMAQ Vision example Folder.vi

  Thank you for your cooperation,

  John

  Hi, thanks for your response, I did it and I don't know why, but did not work. I solve the problem using the IMAQ Vision AVI Folder.vi and change the block diagram and removal of some parts and then rename it as the vi that I lost. In this way, I solved the problem.

• bug in several functions of IMAQ vision mask

  Some functions IMAQ Vision bad work if you use the image source as the mask. I keep running into this bug in IMAQ Vision, Vision functions exhibit this behavior, and others do not. It is not documented in job descriptions. Even if it were, it would still be a bug. Example:

  1. create an image source U8 containing zeros and nonzero values.

  2. son of the image in the entry source and IMAQ mask entry quantify and return the value of % of the global report to see what percentage of pixels are different from zero.

  The answer is wrong. If you copy the image in a separate image first and distinct picture of wire in the input mask, you get the right answer. See attached VI for building

  

  See you soon,.

  -root

  If someone knows a way to return the number of pixels not dummies in an image without duplicating the image in memory, please post the method here so I can mark it as a solution. I find that using IMAQ getpixelvalue in a double loop is extremely slow, even with a shift as a counter register.

  Using the histogram IMAQ VI seems to work (with no mask image)-the first index of the returned histogram array is the number of zero pixel, so the sum of the table no less (or less area this) is the number of pixels non-null.  The VI has the same bug with the image of the mask (and I agree with you that document a bug does not correct!) but at least you can use for this problem.

  Cheers ~ Greg

• How to reset Windows 7 password with USB

  The first thing we often do when we * password lost Windows 7 * is to ask an it expert for help. However, it is only a moment for you * forget password Windows 7 * and it may take you several days to regain access to your system. Later, don't worry about anything when you forgot the password for windows 7. The article will give you some ideas for * reset password Windows 7 * with USB drive.

  * Chapter 1: Reset password reset Windows 7 password disk.*

  Most people know generally only how to create a new user with a password or change it. But they do not develop a habit to create a password reset disk to prevent the lost password. This is an excellent and free Microsoft gift. Click here to learn how to create the password reset disk in windows 7 If you loan have a reset disk, follow these steps:

  Step 1: Start or restart your computer, insert your USB key. In the home interface, press ctrl + alt + delete, enter the classic logon box. Then type the user name that you want to use and a wrong password or leave the field blank, and then press ENTER or click OK. It will show you logon has failed.

  Step 2: Click on * reset password *... it will show you the password reset Wizard. And it allows you to create a new password for your user account. In the password reset Wizard dialog box, click on * following *.

  Step 3: Select the disk that you insert, click on * following *. Type a new password in the Type a new password box, and then retype the password in the Type the password to confirm box. In the Type, a new indication of password box, type a hint for the password or no, and then click on * next * → * finished * and then try to open a Windows XP session again when to use the new password you just put.

  EC * USB password reset disk * use only in a certain account that you have created before, or it will not help. Therefore, it is best to create a password reset disk when you add a password to the account.

  * Section two: Reset Windows 7 password Windows password rescuer run from USB drive

  If you have not created a password reset disk for your account and unfortunately you lost or forgotten windows password, see below. I'll show you a guide step by step to do this task in minutes with USB, without reinstalling the system or loss of data.

  Step 1: Prepare a 2 GB USB flash drive and a computer that you can access.

  Step 2: Download Windows password of lifeguard and install it on a computer on which you have access.

  Step 3: Run the program and burn the ISO image to the USB Flash drive.
  * NOTE: * this action will make your formatted USB drive and all data in it will be lost. You would provide better with nothing in it.

  Step 4: Use the USB to reset the password of windows 7. Before this, you must set your start your computer by USB. Then start your computer and enjoy the process of resetting the password, it is easy and fast. Don't worry if you are struggling for the parameter, you can see more in the Windows bios password rescuer website.

  Posting of interest. Thanks for this detailed description and useful links.
  If you have more interesting things to share with us you are welcome.

• IMAQ vision function reference

  Hi all

  I'm new to Lab Windows/CVI and uses the library imaq vision.

  Could someone tell me where I can find the reference of function IMAQ Vision? I found a function reference manual at first--> National Instruments--> Vision--> Documentation. But all the functions described in this document are starting by img * (). I was looking for functions starting with imaq * ().

  I'm sorry that it might be a stupid question, but any help would be appreciated.

  See you soon,.

  Thanks Alex,

  I found the document

• How to superimpose a tilted image with retangle part

  I know IMAQ overlay Retangle.vi can overlay part of an image with retangle, but I want to overlay with inclined retangle (see overlay.jpg), how can I solve this problem?

  Thank you

  Hi, skyover,

  Just create rotated rectangle KING, then KING of overlay instead of the rectangle:

  

  Andrey.