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Probably the contour processing works here,

You can do the following,

• Convert BGR image to HSV color space
• Apply inRange() to segment object
• Find contours.
• Filter contour by it's area

Probably the contour processing works here,

You can do the following,

• Convert BGR image to HSV color space
• Apply inRange() to segment object
• Find contours.
• Filter contour by it's area

Probably the contour processing works here,

You can do the following,

• Convert BGR image to HSV color space
• Apply inRange() to segment object
• Find contours.
• Filter contour by it's area

Note: If you already segment segmented the object then perform the last two steps only.