topic Stitch images with overlap in LabVIEW

Stitch 2D Data

SSG0484 — Thu, 04 Apr 2019 06:32:38 GMT

Can someone provide me idea how to stitch 2D images.

I have tried myself , but its not working.

Stitch images row wise with multiple rows

SSG0484 — Wed, 03 Apr 2019 05:18:35 GMT

I have a VI code to stitch images rows with more than one row.

There are some errors.

Can you help me to correct it.

Re: Stitch 2D Data

Gregory — Thu, 04 Apr 2019 15:24:06 GMT

Can you give some more background of what you want? I cannot see your VI since I'm on LV 2016. If you want to join 2 images vertically and you are using the VAS (vision acquisition software from NI), then you can convert both to arrays and build array. If you want to join horizontally you would have to transpose both, build the array, then transpose the output.

Re: Stitch 2D Data

SSG0484 — Thu, 04 Apr 2019 15:34:59 GMT

I want 3*3 array of images.

I don;t know how to give loops.

Because most of the blocks in labview support 1 row or column only

Re: Stitch 2D Data

Gregory — Fri, 05 Apr 2019 21:03:43 GMT

Maybe something like this will work for you. In the place marked "Load Images Here" you would load up your images from the file. Instead, I just create a ramp of values from 0 to 255. You might have to do some reorganizing to get the images exactly how you want them.

Re: Stitch 2D Data

SSG0484 — Sat, 06 Apr 2019 03:54:29 GMT

Thanks ...

@Gregory wrote:

Maybe something like this will work for you. In the place marked "Load Images Here" you would load up your images from the file. Instead, I just create a ramp of values from 0 to 255. You might have to do some reorganizing to get the images exactly how you want them.

Vertical stitching

SSG0484 — Sun, 07 Apr 2019 17:38:28 GMT

I have a modified a horizontal stitching program to vertical stiching. But I am not getting desired output.

Can you help me with it?

Thanks

Re: Vertical stitching

altenbach — Sun, 07 Apr 2019 18:41:22 GMT

You have attached an empty diagram.

(Seems unnecessary waste of bandwidth because we can create that without your help in about a second. :D)

You should also link to the earlier discussion so we have context.

Re: Vertical stitching

SSG0484 — Mon, 08 Apr 2019 03:13:00 GMT

Sorry

Re: Vertical stitching

RavensFan — Mon, 08 Apr 2019 03:21:18 GMT

@SSG0484 wrote:

I have a modified a horizontal stitching program to vertical stiching. But I am not getting desired output.

Can you help me with it?

Thanks

What does "not getting desired output" mean? You're not getting any output? Or the output is different from what you expect? And if so explain, in detail.

PS: You should correct the spelling of "stitched" in your VI.

Re: Vertical stitching

SSG0484 — Mon, 08 Apr 2019 03:22:19 GMT

I want all images to be stitched vertically.

Re: Vertical stitching

RavensFan — Mon, 08 Apr 2019 03:38:20 GMT

We know what you want. But you hadn't described what was wrong. At least now the image shows us something is wrong, but still isn't clear what.

I don't understand your array manipulation at the top of the last For Loop. Why are you replacing array elements? Or even have an array at all? What is the array that is initializing the shift register? You are always indexing out element 0. It seems to me that index 1 would be properly, The subVI looks for "left/top". I think stitching vertically, the top of the image is being moved down, not the left. Wouldn't that be the second element of that array? And why play with an array at all. Just put an integer in the shift register, read the value, combine that into the array with a 0 for left. Take that original element and add the height and put that scalar in the shift register to be the new top for the next iteration.

Also, check the detailed help for Image to Image function. There is a 3rd image reference input you have unwired. Since that says destination image, I'm think that is what your Stitched image reference should be wired into. But it is all very confusing as you are combing 2 images, yet the subVI has 3 inputs and 1 output. You may even need a shift register on that reference wire.

Re: Vertical stitching

SSG0484 — Mon, 08 Apr 2019 07:33:47 GMT

Thank u so much for suggestions......

Stitch images with overlap

SSG0484 — Sat, 13 Apr 2019 11:41:25 GMT

Hi,

Can someone give suggestions to stitch images with small amount of overlap.

Which all vi's are used for that?

Re: Stitch images with overlap

altenbach — Sat, 13 Apr 2019 18:30:53 GMT

@SSG0484 wrote:

Hi,

Can someone give suggestions to stitch images with small amount of overlap.

This description is insufficient because you need to define what should happen at the places of overlap (average both pictures, first one wins, second one wins, etc.)

In the general case, you would first allocate a 2D array of the final size, then replace (or average, etc.) subsections with the image data at the desired locations.

Re: Stitch images with overlap

SSG0484 — Sun, 14 Apr 2019 15:43:11 GMT

Actually I would like to take average at overlap regions.

Re: Stitch images with overlap

altenbach — Sun, 14 Apr 2019 17:37:32 GMT

@SSG0484 wrote:

Actually I would like to take average at overlap regions.

So do you have problems with the stitching or with the averaging? What is the datatype of the image?

Re: Stitch images with overlap

SSG0484 — Mon, 15 Apr 2019 09:26:07 GMT

Actually I need to stitch images of microscopic slide captured using camera. For now I need to stitch two rows of slides with four columns with both vertical and horizontal overlap. Image is monochrome 8 bit image of resolution 3088*2076.

Actually I don't know how to start.

I am new to labview image processing.

So I am searching for ideas to get start with.

I have acquired images with sufficient overlap on both vertical and horizontal.

I need to apply average of images at areas of overlap.

Re: Stitch images with overlap

Frozen — Mon, 15 Apr 2019 14:22:51 GMT

Do you have precise control of the overlap areas? Otherwise you will first need to determine the amount of overlap between images before "stitching" them together.

It has been many years since I have used NI's imaging package. Have you looked for a native stitching function? The other option is to us third party SW like ImageMagick to do the work for you.

Re: Stitch images with overlap

SSG0484 — Tue, 16 Apr 2019 18:36:39 GMT

How to determine overlap region?

I have attached work i have done till now.