blob detection in matlab

I am new to Matlab. My Gray scale image has Blobs and Lines. How to detect blobs?. Using 8-connctivity rules. Need to log the sizes of each blob followed by x,y of pixel?. I read about bwlabel. Is it possible to detect Blobs and lines separately?.

[Erik S.]

can you provide an example image?

Answer 1

[Alexey Gordienko]

Hello! Here is my example of processing a binary image for highlighting license plates of cars using blob analysis

function [BBOX_OUT, NUM_BLOBS, LABEL] = CCA(Image)
    BBOX_OUT = [];
    NUM_BLOBS = [];
    LABEL = [];
%%connected component analisys
    hblob = vision.BlobAnalysis;
    hblob.CentroidOutputPort = false;
    hblob.MaximumCount = 3500;
    hblob.Connectivity = 4;
    hblob.MaximumBlobArea = 6500;
    hblob.MinimumBlobArea = 200;
    hblob.LabelMatrixOutputPort = true;
    hblob.OrientationOutputPort = true;
    hblob.MajorAxisLengthOutputPort = true;
    hblob.MinorAxisLengthOutputPort = true;
    hblob.EccentricityOutputPort = true;
    hblob.ExtentOutputPort = true;
    hblob.BoundingBoxOutputPort = true;

      [AREA,BBOX,MAJOR,MINOR,ORIENT,ECCEN,EXTENT,LABEL] = step(hblob,Image);
      imshow(LABEL*2^16)
      numberOfBlobs = length(AREA);

     allowableAxis = (((MAJOR./MINOR) > 3.8) & (AREA > 200) & (abs(rad2deg(ORIENT))<10) & (EXTENT> 0.6));

      idx = find(allowableAxis);
      keeperBlobsImage = ismember(LABEL, idx);
      imshow(keeperBlobsImage)

      LABEL = bwlabel(keeperBlobsImage, 4);

     for i =1:length(idx)
         BBOX_OUT((i),1:4) = BBOX(idx(i),1:4);
     end

     NUM_BLOBS = length(idx);
  end

[Yosef Asseaf]

when I run your code an error 'Not enough input arguments' has appear.what shall I do.

[Stephen23]

@Yosef Asseaf: the function CCA requires one input argument: did you call it with one input argument?

[Image Analyst]

Yusef, see my Image Segmentation Tutorial https://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862&sort=downloads_desc I think it will help you.