Task: Lungs detection in grayscale x-ray images

Preprocessing

• Apply Gaussian blur
• Apply opencv's AddWeight function (to increase grayscale contrast)
• Thresholding (Grayscale -> binary)

Identify lungs area

• Find Contours
  • different contours will be formed including parts such as trachea and skull, as well as background noise
  • contours near image edges as well as contour < 2% of images are removed
• Morphology
• Draw lungs area

Evaluation

• Compare the similarity of lungs area with ground-truth by computing Euclidean distance