MATLAB: Detection of 3D blobs with flat surfaces

Image Processing Toolboximage segmentation

I have a 3D gray-scale array that represents a bag with several objects inside. I need to find (segment) any object with flat surface/s in the bag. Knowing the approximate intensity range of these objects, I binarized the volume, and removed objects with volumes below a threshold.

The result was getting some of those objects as individual blobs and some attached to nearby objects.

Now, I would like to detect blobs with flat surfaces. Any suggestion?

Best Answer

Try convhulln() and extract any blob that has points on the convex hull.

Related Solutions

MATLAB: How to calculate area of an irregular shape region in a binary image

Try this:

props = regionprops(binaryImage, 'Area');
allAreas = [props.Area]

MATLAB: How to select irregular area in a pic.

To find the area you may need to segment your image. If you just want to define the area's vertices somehow, like with roipoly() or imfreehand(), then you can get the area with polyarea(). However if the area is defined by something like intensity, texture, or whatever, then you need to segment the image. Segmentation means undergoing a series of steps such as filtering or morphology or something until you eventually get to an image that can be thresholded to form a binary image (your segmented image). With that binary image you can then label it with bwlabel() or bwconncomp() and then call regionprops(). Or you can call bwarea() for a different definition of area, weighted by how the boundary winds around, whereas regionprops() gives area as a simple count of pixels in the blobs.

Best Answer

Related Solutions

MATLAB: How to calculate area of an irregular shape region in a binary image

MATLAB: How to select irregular area in a pic.

Related Question