calculate Z from two images possible?

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Hi,

im trying to calculate the depth of a pixel from two given images.

My idea:

• calibrate the camera (calculate instrinsic camera parameters)
• find feature points with sift or surf in both images
• macht the feature points from the two images with flann
• calculate fundamental matrix
• calculate z with Epipolar gemometry
• calculate cm from pixelvalues

is my approach right? will this work or is this possible?