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I would expect that CV_FM_RANSAC_ONLY computes rough fundamental matrix and filter outliers, while the CV_FM_RANSAC performs fundamental matrix computation using RANSAC algorithm to find rough fundamental matrix and then perform robust fundamental matrix estimation using only inliers from previous stage. This gives you better result but needs more time.

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I would expect that CV_FM_RANSAC_ONLY CV_FM_RANSAC_ONLY computes rough fundamental matrix and filter outliers, while the CV_FM_RANSAC CV_FM_RANSAC performs fundamental matrix computation using RANSAC algorithm to find rough fundamental matrix and then perform robust fundamental matrix estimation using only inliers from previous stage. This gives you better result but needs more time.