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Yep, sounds about right. But keep in mind that the camera calibration needs to be performed only once (if the stereo rig is fixed). So the order of the steps would be something like:

Only once (actually there is a ROS package that can help you: camera_calibration):

1. calibrateCamera for each camera.
2. stereoCalibrate.
3. stereoRectify.
4. Store calibration parameters.

Later in your ros node:

1. Load calibration parameters.
2. On each iteration: simpleBlobDetect -> undistortPoints -> perspectiveTransform

Have fun!