bugfix: blobdetector was putting incorrect diameter value in keypoints
-j8 in linux_installation tutorial
Fix a typo error
Fix a typo error
Merge pull request #2330 from rohitgirdhar:linux_tutorial_make_j8
Merge pull request #2328 from rohitgirdhar:bugfix_blobdetector_kpt_radius
Merge pull request #2337 from pmoulon:master