Image reading in labview

Hi I am venkat. I am new to labview. can anyone help me how to read and find its information in labview. thank you.

Hi eswar,
ever looked over the functions palette?
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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Dicom image files in labview

hello everybody,
I want t view dicom image files in labview, i tried downloading dicom sdk's of activex, then i tried to import Dcsdk through tools palette,which i couldnt do it. Can anyone please tell me the way to proceed. I have dicom software installed in my pc and i also have some dicom image files.

Hi,
I would like to suggest you to go through the forum post where you can find the link for the DICOM code example written in Labview.
Kind regards
Marek S.

Binary file readed from Labview and Borland C++ v.5

Hi Everybody!
My problem is reading binary file from Labview 7.0 and Borland C++ version 5 is not the same.
Only one difference is "space". Reading from Labview I got "00" (decimal) and reading from Borland C++ I got "32".
I also try to read this binary file with Matlab 6 and I also got "00" as well as those from Labview.
I really struck with this problem.. Anybody has an idea about this problem.
Thanks a lot for anybody help!
Nok

Hi,
These threads regarding reading of binary files was recently discussed in this forum
You might find some answers for your query
http://forums.ni.com/ni/board/message?board.id=170&message.id=99016&requireLogin=False
and
http://forums.ni.com/ni/board/message?board.id=170&message.id=153565&requireLogin=False
Regards
Dev

I cannot display image (read from oracle BLOB field) on browser?

I cannot display image (read from oracle BLOB field) on browser?
Following is my code, someone can give me an advise?
content.htm:
<html>
<h1>this is a test .</h1>
<hr>
<img src="showcontent.jsp">
</html>showcontent.jsp:
<%@ page import="com.stsc.util.*" %>
<%@ include file="/html/base.jsp" %>
<%
     STDataSet data = new STDataSet();
//get blob field from database
     String sql = "SELECT NR FROM ZWTAB WHERE BZH='liqf004' AND ZJH='001'";
     //get the result from database
     ResultSet rs = data.getResult(sql,dbBase);
     if (rs!=null && rs.next()) {
          Blob myBlob = rs.getBlob("NR");
          response.setContentType("image/jpeg");//
          byte[] ba = myBlob.getBytes(1, (int)myBlob.length());
          response.getOutputStream().write(ba);
          response.getOutputStream().flush();
     // close your result set, statement
     data.close();
%>

Don't use jsp for that, use servlet. because the jsp engine will send a blank lines to outPutStream corresponding to <%@ ...> tags and other contents included in your /html/base.jsp file before sending the image. The result will not be treated as a valid image by the browser.
To test this, type directly showcontent.jsp on your browser, and view it source.
regards

Iterate over selected images, read/change crop settings in LR3?

Since there is a new SDK I thought I ask again for this version:
I'd like to write a Lightroom script which iterates through all selected images, read and change the crop settings of (nearly) every image.
Is this possible to achieve in lua using the LR3 SDK? Or is it still not possible to read and write development settings?
Kind regards,
Sam

You can read individual develop settings but only apply presets. That's better than nothing, but allowing us to write develop settings would have opened up a whole new world of possibilities - I think it scared them...
A possible work around: read settings, create a temp preset, write changed settings to the temp preset, then apply it.
NoYeah?
Rob

Image reading problem in servlet

Image reading problem in servlet
I am reading an image in servlet and writing it to ServletOutputStream
The following code works fine unless I change the size of the byte array (for increasing download speed) from 8 to something like 128 or any other higher value
If I change the value of byte array size the image does not get downloaded properly, I mean the quality of the image changes, it does not looks like the original imageURL url = new URL("http://www.mysite.com/images/img1.jpg");
URLConnection con = url.openConnection();
con.setUseCaches(false);
BufferedInputStream in = new BufferedInputStream(con.getInputStream());
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
byte b[] = new byte[8];
while(in.read(b) != -1)
     out.write(b);
     out.flush();
out.close();
in.close();what do I change
byte array size
or use the constructor of BufferedInputStream with 2 parameter
or use the constructor of BufferedOutputStream with 2 parameter
or use flush outside while loop or what else

Change your while loop to:
int count;
while((count = in.read(b)) != -1)
     out.write(b, 0, count);
     out.flush();
}The penultimate time read is called, it may not fill the entire byte array. You only want to write out however much was read into the array.
For better performance, you should move the flush() outside of the loop too. BufferedOutputStream will flush automatically when its internal buffer is full.

Need Help on how to use Adobe Image reader

Hi,
I Needed to know what important features are available using the latest Adobe Image reader & does it help really in making Good Quality webpages

I'd recommend you start here: Getting Started with Adobe Connect - Adobe Connect User Community

Check Focus Of An Image With Standard LABVIEW Functions

Hi,
I would like to determine the best focus quality of a series of color images using standard LABVIEW functions, an example my images would be a 1mm x 2mm ROI of a copper coin or similar sample. I do not have the IMAQ vision toolkit so that will not be an option. Could somebody give me an example of this or point me in the direction I need to go. Is it better to check focus quality on the color image or a black and white image, or perhaps an intensity representation of the image? I have heard that checking the Standard Deviation of a line of pixels within the image would give a good indication of the focus quality by looking for the highest SD value of all the images?
Any help is greatly appreciated!
Solved!
Go to Solution.

Hi Jimmy01,
I found this example which shows a couple ways to determine the best focus for your system: http://www.ni.com/example/28506/en/
I also found this example, although it uses the IMAQdx drivers. So you'll have to modify it a bit to work with the IMAQ drivers, but it's doable: https://decibel.ni.com/content/docs/DOC-11090
It looks like these examples detect the best focus by measuring the sharpness of the edges. A stronger edge means the camera is more in focus. This is also what I was thinking before I found these. I haven't been able to find anything about using the standard deviation of line pixels, as you mentioned.
Julian R.
Applications Engineer
National Instruments

Image filters for LabVIEW

Hi,
I'm looking for image filters in LabVIEW similar to PhotoShop or Paint Shop
Pro filters.
Do you know something about that?
Miguel.

Miguel,
The IMAQ Vision toolkit has some simple filters available. Most of them are also available in Vision Builder. However, any "high-tech" filters like the ones in PhotoShop would have to be developed from scratch.
I have some experience designing image filters. I would be glad to discuss any specific filters you are trying to achieve. I can be contacted at [email protected]
Bruce
Bruce Ammons
Ammons Engineering

Images displayed in Labview do not stay synchronized across multiple frames

Hello,
I'm a little new of a poster, but a long time lurker. I'd like to thank everyone that answers here for all of the questions that I have previously read and from which I have learned so much.
I am creating an Labview FPGA based solution in Labview 12.0 32bit on Windows 7. I have a target FPGA module which captures data from an external apparatus, does some processing locally, and then uses a DMA FIFO to send this data to the host, one sample/pixel at a time.
The host takes this pixel data, does a little bit more processing to it and adds each row to a queue. This queue is then looked at, some more processing is done to the rows and they are combined together, finally resulting in a 2D array that is displayed using the 'intensity chart' indicator.
I have managed to get this running at around 10 fps, creating essentially a movie. The synchronization is done via a trigger signal sent from my external apparatus to the FPGA to keep both each row and each frame displaying correctly.
The problem has been that as I try to add a little bit more functionality to the host (specifically - I'm trying to send across 2 channels simultaneously from the FPGA by combining them into a U32, and so I need to pull that combination apart and translate it back into fixed point in an automatically indexed for loop, at which point I pass one of the channels through same processing as before before displaying just that one channel), I have seemed to hit some sort of wall of functionality in that my synchronization no longer works. That is, my image, instead of being properly centered, it is skewed so I see only half of each frame each time I display the image. Finally, when I move my mouse around, or scroll my front panel, or even hover over the start bar (and have the Windows 7 window previews pop up) or do pretty much anything else with the Windows UI, my frames start 'skipping' and they change where they overall in the horizontal and vertical direction.
This leads me to conclude that there is some resource that I am unaware of that is limited and that overflows whenever I do anything with the UI. This resource then overflows and drops some lines of pixels. When the program recovers, it goes back to displaying full frames, but by this point things are out of synch already, so I never return to a 'correct' image, although this is just a hypothesis.
Question:
Does anyone know if there is a hidden resource that Labview is using that would cause degradation of performance tied to UI changes in Windows or in Labview proper? If so, is there anything that I can do to increase this resource? If not, then is there another approach that I should be using for these type of high throughput requirements?
Thanks everyone!
Adrian

Hi Florian,
Thanks for your response!
I can try that - thanks.
In terms of giving more, unfortunately, I am unable to post the actual code, or else I would have already. I will try to describe the problem as much as possible:
I am processing data points in the FPGA, then transferring to the host. At the host, I am combining the elements together into a 2D array, transposing them, and sending them back to the FPGA. On the FPGA side, I am again operating on each element, before transferring back to the host. Now that the final values are at the host, I am displaying them.
1. Is there a quick way to transpose a 2D array on the host? I assume that I will need to gather all of the elements together into a 2D array and then transpose it, before splitting it up again. Is that correct?
When I split it out again, is there a faster way to do it than to auto-index this array in a for loop and feed that into a DMA FIFO back to the FPGA?
2. My assumption is that the host cannot process things fast enough and that it is the cause of the dropped pixels. Is there a way to see where a buffer is dropping data during operation? Other than the 'timeout' states on the DMA FIFOs, is there a way to check on queues or other host constructs? Would this be purely through the queue 'get number of elements left' method?
3. My algorithm is reliant on a transpose, which is why I have a back and forth between the FPGA and the Host. Do you know of a good way to apply a transpose on an array purely in the FPGA? That would eliminate a round trips and thus reduce a lot of the load on the host.
Thanks for your help!
Best,
Adrian

Using IMAQ Image controls in LabVIEW steps

Hi guys
So far, I was using TestStand 4.0 together with LabVIEW 8.5 and Vision Development Module 8.5 with no problems. Recently, I've updated to LV 8.6 and VDM 8.6. I've started to experience weird problems when using LabVIEW steps with inputs/outputs containing IMAQ Image controls. When I try to click on such a step in seq editor, or try to insert a new step into the sequence, the step initialization takes a very long time (tens of seconds) or freezes completely. I've also tried to upgrade TS to version 4.1, but no difference. Also, my colleague experiences very similar symptoms on the same software setup. The only difference is that on his machine, it takes only a few seconds when you click on the vision step. However, the steps not containing an IMAQ Image control behave normally, i.e. you can't experience any "initialization time" when clicking on them in the sequence.
To illustrate, I'm attaching a simple VI containing nothing more that a single IMAQ Image control. If you don't link it to the connector pane, the VI works fine when inserted as a TS step. If the IMAQ Image control is linked to the connector pane, TS freezes when inserting such a step.
Vladimir
Solved!
Go to Solution.
Attachments:
ft5.vi ‏5 KB

Hello Vladimir,
Thank you for posting on the NI Discussion Forums. This was reported to R&D (#123249) for further investigation. The only workaround I can offer for now is to work with the VIs from version 8.5 of LabVIEW if they have vision controls linked to the connector pane. Thanks for the feedback!
Chris_G
Sr Test Engineer
Medtronic, Inc.

NEF image format in Labview

Hi,
I need to load a NEF image into labview. NEF (Nikon Electronic Format) is Nikons own RAW image format.
Is there anybody who knows how to do it?
Thanks!

RAW/NEF isn't actually a picture - it's got all the ingredients for an image, but you have to "cook" it first.
Adjustments like levels, gamma, exposure, brightness/contrast, and color balance aren't actually applied yet.
Apple has their "ImageIO" library that can deal with most RAW formats, Microsoft may have something but it's not included with the op system. Nikon's CaptureNX can obviously work with those files.
Are you after the image that's shot as a .NEF, or are you trying to "cook" that image in LabVIEW?

Download disk image of older labview revisions

Is there a place to download older revisions on LabView (7.1.1)? Looking for CD image of LabView 7.1.1 installation CD to make changes to old code.
Solved!
Go to Solution.

Everything is floating around Internet these days. But doing this may be clear case of "copyright infringement". Give your local NI office a call. They have some free solutions for such cases.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Grid View: Flags, Rating, Color Label read only? / Mark Images Read only?

Hi
I'd like to see the flag-status, rating and color label assigned to an image as cell icons. But if I show them as Cell Icons, I am also able to change them, which happens to me quite often accidentally when I click into the frame of a image to change selections.
Is it possible to show these markers for each image without being able to change them in the frame? I would be quite happy being able to change them from the tool bar, but still being able to see them on the single image.
Related to this:
Is it somehow possible to mark images as read only, so that further changes (development, metadata etc.) can be made impossible? This would be nice for older images, which have been processed completely and should stay that way, inhibiting accidental changes to images. Sometimes it is difficult to even notice when one accidentally changes metadata on an image.
Thanks for your thoughts
Beat Gossweiler
Switzerland

Yes it's a bug. I see it on Mac platform.

How can I make a projection of an image (diaporama) with LabView?

Hi, I would like to project an image (or better a matrix stored in a table) on a second screen (or videoprojector, or whatever) connected to the computer. In two words I would like to do what PowerPoint does by pressing on "diaporama".
Does somebody knows if that is possible with LabView (without scrolling the LabView window on the second screen since that doesn't make a FULL SCREEN projection of the image)?
Hope somebody can help
Thanks
TonyMontana

Tony,
I am not sure I understand exactly what you are trying to do as I never use PowerPoint.
At NIWeek in 1999 (if I recall correctly) David Moore gave a presentation that used a program he wrote entirely in LV.
I have a program which runs a slide show on a second monitor (projector). All the controls are on the main screen and the display on the second monitor consists of a simple subVI with a picture indicator sized to fit the projector window. The subVI keeps its front panel open and gets called every time the image updates.
This is a work in progress and has not yet been used in public.
Lynn

Image reading in labview

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