how to extract roi automatically

2017 9 24
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更新时间：2017 10 8
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how to extract blobs (affected region) in lungs CT scan image without free hand selection using auto selection based on color r something . in that extracted output it needs to display only the blobs in white. background needs to be black

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Walter Roberson
Walter Roberson 2017-9-24
Is this cancer or TB to be detected, or something else?
CT scans are grayscale so you will not be able to detect anything by color.
sathish kumar rb
sathish kumar rb 2017-9-26
Cancer & Bronchities . I have attached my segmented lung

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Selva Karna
Selva Karna 2017-9-24

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use imroi

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Walter Roberson
Walter Roberson 2017-9-24
imroi is not able to automatically decide where the ROI should be.

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Image Analyst
Image Analyst 2017-9-24

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Image Analyst
Image Analyst 2017-9-27
Not sure what you want so I can't tell if it's right or wrong. I have a demo for segmenting the lungs - see attached and see if it works for you.
sathish kumar rb
sathish kumar rb 2017-10-8
i need to extract the roi(blobs) affected region only . the affected region displays like white and others will be black ...
sathish kumar rb
sathish kumar rb 2017-10-8
编辑：Image Analyst 2017-10-8
Input: Segmented Lung
Output: ROIs with class labels
The pathology bearing regions are the region of interests. ROI is used to identify the abnormality from the segmented lungs.
Algorithm: ROIs Extraction
  1. Step 1: Extract the PBRs from the lung tissues as ROIs by finding the range of pixel intensity values to differentiate the PBRs and other lung pixels. If no PBRs present, then the slice is considered to be normal.
  2. Step 2: Obtain the class label information of each ROI from an expert.
Image Analyst
Image Analyst 2017-10-8
What are PBRs?
Go here for better algorithms: Medical Image Processing Algorithms
Try imfreehand(), like in the attached demo, to have your expert draw the ROI.

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