{"action":"created","comment":{"url":"https://api.github.com/repos/scikit-image/scikit-image/pulls/comments/50633430","id":50633430,"diff_hunk":"@@ -0,0 +1,116 @@\n+from __future__ import division\n+\n+import numpy as np\n+from ..util.dtype import dtype_range\n+\n+__all__ = ['mse', 'nrmse', 'psnr']\n+\n+\n+def mse(X, Y):\n+    \"\"\" compute mean-squared error between two images.","path":"skimage/measure/_simple_metrics.py","position":10,"original_position":10,"commit_id":"cfb9c760db3eb51d7e6215a93ff3eaae5d3eed12","original_commit_id":"cfb9c760db3eb51d7e6215a93ff3eaae5d3eed12","user":{"login":"ahojnnes","id":134307,"avatar_url":"https://avatars.githubusercontent.com/u/134307?v=3","gravatar_id":"","url":"https://api.github.com/users/ahojnnes","html_url":"https://github.com/ahojnnes","followers_url":"https://api.github.com/users/ahojnnes/followers","following_url":"https://api.github.com/users/ahojnnes/following{/other_user}","gists_url":"https://api.github.com/users/ahojnnes/gists{/gist_id}","starred_url":"https://api.github.com/users/ahojnnes/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ahojnnes/subscriptions","organizations_url":"https://api.github.com/users/ahojnnes/orgs","repos_url":"https://api.github.com/users/ahojnnes/repos","events_url":"https://api.github.com/users/ahojnnes/events{/privacy}","received_events_url":"https://api.github.com/users/ahojnnes/received_events","type":"User","site_admin":false},"body":"\"compute\" -> \"Compute\", remove leasing space in the line.","created_at":"2016-01-24T10:21:28Z","updated_at":"2016-01-24T10:21:28Z","html_url":"https://github.com/scikit-image/scikit-image/pull/1897#discussion_r50633430","pull_request_url":"https://api.github.com/repos/scikit-image/scikit-image/pulls/1897","_links":{"self":{"href":"https://api.github.com/repos/scikit-image/scikit-image/pulls/comments/50633430"},"html":{"href":"https://github.com/scikit-image/scikit-image/pull/1897#discussion_r50633430"},"pull_request":{"href":"https://api.github.com/repos/scikit-image/scikit-image/pulls/1897"}}},"pull_request":{"url":"https://api.github.com/repos/scikit-image/scikit-image/pulls/1897","id":56992879,"html_url":"https://github.com/scikit-image/scikit-image/pull/1897","diff_url":"https://github.com/scikit-image/scikit-image/pull/1897.diff","patch_url":"https://github.com/scikit-image/scikit-image/pull/1897.patch","issue_url":"https://api.github.com/repos/scikit-image/scikit-image/issues/1897","number":1897,"state":"open","locked":false,"title":"add simple metrics (PSNR, NRMSE)","user":{"login":"grlee77","id":6528957,"avatar_url":"https://avatars.githubusercontent.com/u/6528957?v=3","gravatar_id":"","url":"https://api.github.com/users/grlee77","html_url":"https://github.com/grlee77","followers_url":"https://api.github.com/users/grlee77/followers","following_url":"https://api.github.com/users/grlee77/following{/other_user}","gists_url":"https://api.github.com/users/grlee77/gists{/gist_id}","starred_url":"https://api.github.com/users/grlee77/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/grlee77/subscriptions","organizations_url":"https://api.github.com/users/grlee77/orgs","repos_url":"https://api.github.com/users/grlee77/repos","events_url":"https://api.github.com/users/grlee77/events{/privacy}","received_events_url":"https://api.github.com/users/grlee77/received_events","type":"User","site_admin":false},"body":"This PR adds simple metrics:  `mse`, normalized root mean square error (`nrmse`) and peak signal to noise ratio (`psnr`).\r\n\r\nThese are all pretty trivial to implement, but are still useful to have on hand.  PSNR in particular is widely used as a comparison metric in image denoising/compression papers.  \r\n\r\nI realize that the existing `skimage.measure.structural_similarity` (SSIM) metric is generally superior to these in terms of making image comparisons, but I would argue these are still useful to have around, if only for comparing to results from the 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