extracting a person from a image

[nouman.ashraf91@yahoo.com]

how can i extract a person from its background in an image. Actually i want to calculate the area occupied by that person.

[PaulG.]

Is this an image analysis application? If so use blob analysis. You will need to create a blob out of the person's image. Determine the size of a single pixel. Then count the number of pixels in the blob.  Mulitiply.

[alexderjuengere]

In order to create this blob in the first place, which is called "segmentation", you could use k-means as shown here in Kl3m3ns Blog:

https://decibel.ni.com/content/blogs/kl3m3n/2014/10/15/color-image-segmentation-based-on-k-means-cl...

[NIquist]

Unfortunately what he really needs here is not just Blob Analysis, it's Bob Analysis.  Measuring the area is easy with NI Image tools assuming there's a size reference.  The hard part here is going to be the A.I. that determines that a particular set of pixels form the shape of a human being.  Tricky even with a brute force approach where you have a huge library or "human-like" image data to compare to.

This topic probably does belong in the Imaging forum but either way the OP has to provide a lot more detail about his application if he expects any useful help on the subject.

[alexderjuengere]

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@NIquist wrote:

Unfortunately what he really needs here is not just Blob Analysis, it's Bob Analysis.  Measuring the area is easy with NI Image tools assuming there's a size reference.  The hard part here is going to be the A.I. that determines that a particular set of pixels form the shape of a human being.  Tricky even with a brute force approach where you have a huge library or "human-like" image data to compare to.

This topic probably does belong in the Imaging forum but either way the OP has to provide a lot more detail about his application if he expects any useful help on the subject.

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nice!

[niveraja194]

Hi

Is there any way i can find the area of the white pixels alone in my grayscale image?

thankyou

[GerdW]

Hi niveraja,

yes: count them!

(You count all WHITE pixels and divide by the number of all pixels to get the percentage of WHITE in your image…)

[niveraja194]

Hi

Yeah but how do I count in labview? I tried histogram but still can't figure out how to get the pixel count from the graph.

Thankyou

[GerdW]

Hi niveraja,

why don't you attach a VI with an example image and your histogram approach?

It's a rather good idea to use a histogram for that purpose…

[niveraja194]

Hi 

I have attached a thresholded image with the simple histogram VI I tried. Please help me get the white pixel count for this image.

Thankyou