Open 32-bit jpeg & convert to intensity graph form (LV8.5 & Vision 8.5)

I will cross-post this in the Machine Vision forum as
well. I have an LLB to open images with IMAQ vision utilities, and
then attempt to convert to intensity graph format. I obtain the color
table of the image from a Vision utility, and subsequently apply to the
intensity graph in hopes of duplicating the vision container contents.
I am unsuccessful in converting 32-bit jpeg and was hoping for some
help. Please let me know if this in fact is even possible to do.
Attached is an example jpeg image file.
Sincerely,
Don
Attachments:
open_image_file_and_convert_to_intensity_graph1.llb ‏207 KB
Photo_111107_0021.jpg ‏240 KB

DonRoth wrote:
Hi George:
Yes - I understand I am getting only one color plane.
With LabVIEW / Vision only, can this jpeg image be displayed in an intensity graph with the proper (original) color information? You say the LabVIEW Read Jpeg File.vi reads this image fine - but how do you display the output of this fx in an intensity graph with the original / proper color information (again using only LabVIEW / Vision, or maybe your toolkit)?
Unless it is an 8 bit color image already you can always down sample it to 8 bit. I think the IMAQ Cast function should do that, otherwise there is for sure some function to change color depth. Colors will of course change slightly as it is very unlikely that a 24bit image especially if it is a photo, has only 256 unique colors used.
Once you converted your IMAQ image into an 8 bit image extracting the bitmap and color dtable is easy and then applying it to an intensity graph of course too. Remains the question why you wouldn't want to use the IMAQ control. If it is about IMAQ license costs then of course you won't be able to use other IMAQ functions either so this advice won't help then.
Rolf Kalbemratter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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I would like to be able to change the color of a set of individual pixels within an intensity graph, to blue for example, while leaving the color table otherwise as is, for example, gray scale. The change to blue would be based on location, not on current gray value. I think I can accomplish this using the mask fx with picture controls, and then convert to intensity graph. Is there a more direct way? A good example to demonstrate this capability would be just using a 'mouse down' event on an intensity graph to change the color at the mouse location. Any thoughts are appreciated.
Sincerely,
Don

Yes, seems to work fine .
If you have LabVIEW 8.0, there is another possibility. There is a new property that allows drawing any pictures or picture elements on your graph area. Of course you could draw individual pixels, but nothing prevents you from e.g. drawing circles, squares, odd shaped areas, arrows or event text. ... Anything you could do with a plain picture indicator. One example that ships with LabVIEW 8.0 is Envelope.vi, see image.
Message Edited by altenbach on 06-12-2006 07:31 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
envelope.png ‏32 KB

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Kind regards,
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Attachments:
Test.vi ‏14 KB

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Most efficient way to extract the amplitude of a signal and display on an intensity graph

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Hi Hillary,
Thanks for your reply.
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I have used the write jpeg file from intensity but image colours are different

Here are the relevent files for my program.
Insert these values
x1=218
x2=368
y1=45
y2=45
r=39 in order to run adn crop the pictures
I hope someone can help
Attachments:
218_368_45_39.jpg ‏23 KB
2ColourProgram.llb ‏355 KB

Hi,
I'd suggest you to use PNG format to save the images of your intensity graphs. You get sharper images than JPEG format.
I made some modification to your program to save PNG files, anyway you can try to save in JPEG and see the difference.
Alberto
P.S. I removed the delay of 100ms from the final Equation with kl fator.vi, the speed is much increased.
Attachments:
2ColourProgram.zip ‏176 KB

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regards

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Don

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Attachments:
test_color2.llb ‏2251 KB

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Hi,
This VI crashes when setting blinking to TRUE, using LV2012, Win7 32 bit. I saw that this was a bug in 2004 , hasn't it been fixed yet? Or am I missing something obvious?
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"Wisdom comes from experience. Experience is often a result of lack of wisdom.”
― Terry Pratchett
Solved!
Go to Solution.
Attachments:
testBlinking.vi ‏16 KB

Yup, still broken LV2013SP1.
I'm not making any excuses for non-action, but I would image that blinking an intensity graph isn't something they get a lot of complaints about...
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Single pixel formation in Intensity graph

I needed to capture a image using CCD camera. Though it has 16 bit resolution, i need to focus on ONE PIXEL.
The process goes like this. Save the image information in a spread sheet array and then find the max value of the array. Till this step, i am OK.
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Intensity graph is 2D array which needs X and Y value.
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Please help me on this. Thanks in advance.

Asking the same question in multiple threads does not help or get you an answer more quickly. Please be patient. Many of us who participate in the Forum do so as volunteers.
Now to your question. As you noted, you can use the Array Max & Min function to locate a pixel with the maximum value. If more than one pixel has that value, this function only reports the first occurrence of that value. The 1D output of the Array Max & Min function contains the indexes of the pixel. So the first element would be the row index (X value) and the second element would be the column index (Y value). What I do not understand is why you want to display just one value on an intensity graph. That seems rather meaningless. Please explain what you want the output to look like.
Lynn

Merge a intensity graph to a Serial write/read

Hey.
I am doing my bachelor in Labview, and are using a arduino 2560 as a microcontroller for a thermal sensor.
After many attempts on connecting the arduino to labview using LIFA.BASE I get connection sometimes, and sometimes not.
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Attachments:
bachelor_2013.vi ‏259 KB
Modded Advanced Serial Write and Read_test.vi ‏40 KB

There is the Simple Serial Write Read example. That should get you started with talking over a serial port with VISA.
It seems like you have an array of bytes that you need to send. You just use the Byte Array To String to convert directly into a string and send it. For reading, there is the String To Byte Array that you can use to start parsing your data.
Show us what you have so far. Be sure to include any sample data you may have and expected results. Things get really confusing when stating ASCII and Hex since people can interpret that in 10 different ways.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Control grid intensity graph

Hi,
I want to control the grid of an intensity graph to be exactly spaced by "1"... How to do?
See attached example in LV8.5. Start with default values and you get grid lines with spacing of 1.
Now change "size" to 15 and run again. Gridlines are now spaced by 0.5. Size=10 -> spacing of 0.2, size=4 -> spacing=0.1 ...
I want to have a spacing of 1 regardless of size parameter! How to achieve this?
Btw. I need both major and minor grid, as array size can grow to more than can be handled by major grid alone...
Message Edited by GerdW on 02-26-2008 03:09 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
Test_Grid_LV85.vi ‏16 KB

Hi Simon,
thanks for clarification.
To summarize: major increment has to be bigger than minor and you have to set them both...
Scale labelling is not so important for me, but it would be nice to have each number when space is sufficient (in the example vi for sizes upto 15). It seems I have to change my graph formatting a little bit: make minor grid transparent when not needed (for small sizes) and switch gridlines on, when scale space is not sufficient to show all numbers...
In the attached example pic (today's measurement of pressure sensor wafer ) I use the gridlines to separate single chips. And I always want to separate single chips regardless of array size (=wafer/chip) - which can vary from 10 to ~80...
Message Edited by GerdW on 02-26-2008 05:26 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
grid-example.png ‏27 KB

Region of Interest (ROI) on Intensity Graph

Hello,
I hope somebody can help me. I have read the other posts available regarding choosing ROIs on intensity graphs but they don't really answer my question.
I am taking a series of still images. Having stored the image as an array and displayed it on the intensity graph, I need some way of selecting a rectangular ROI (preferably with mouse) to define an array subset and performing max/min/mean/standard deviation measurements on this region. I am aware that the array would need reshaping to work with the in built VI for mean and standard deviation but cannot seem to find a way to may the selection of the array subset in the first place.
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Sarah Bohndiek

Hi,
since you're using an intensity graph, you could use an event structure to capture for the mouse down and mouse up events.
They both give you the coords of where the mouse was. The nex trick would be to convert that into array position co-ordinates, which requires knowing how the data is presented in the graph (actual graph area size, and the amount of data passed to it.) It's easy enough to get the size of the plot area, and you can get the position of the control itself, however calculating exactly where the plot area is inside of the control is not available.
If you plot area size is fixed, you could use a picture control, set to transparent over the top of the plot area. Then use the same trick for the event returning co-ordinates. If you change the values on the scale however, the actual plot area can change in size too (since the renumbering on an auto-scale can cause the scale on the axis to move if the text increases or decreases in length)
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Hope that helps
Sacha Emery
National Instruments (UK)
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Attachments:
roi on intensity (picture).vi ‏73 KB

Open 32-bit jpeg & convert to intensity graph form (LV8.5 & Vision 8.5)

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