Comments for Steve on Image Processing
http://blogs.mathworks.com/steve
Steve Eddins has developed MATLAB and image processing capabilities for MathWorks since 1993. He also coaches development teams on designing programming interfaces for engineers and scientists. Steve coauthored <i> Digital Image Processing Using MATLAB</i>.Wed, 26 Aug 2015 21:08:48 +0000hourly1http://wordpress.org/?v=4.0.1Comment on Many D65 values to choose from by Eric S
http://blogs.mathworks.com/steve/2015/08/25/many-d65-values-to-choose-from/#comment-28199
Wed, 26 Aug 2015 21:08:48 +0000http://blogs.mathworks.com/steve/?p=1414#comment-28199http://imgs.xkcd.com/comics/standards.png
]]>Comment on Many D65 values to choose from by Steve Eddins
http://blogs.mathworks.com/steve/2015/08/25/many-d65-values-to-choose-from/#comment-28197
Wed, 26 Aug 2015 10:52:21 +0000http://blogs.mathworks.com/steve/?p=1414#comment-28197Nathaniel—I’m glad I’m not the only one going a little bonkers over stuff like this. Our quality engineers offer raised eyebrows over gold tests with tolerances like 5e-4. Unfortunately, that can hide what should have been easily identifiable and correctable precision issues. And it’s not just the implementations – the reference specs and standards have precision problems, too. The problem I’m trying to track down now stems partly from following reference specs too literally.
]]>Comment on Many D65 values to choose from by Nathaniel Smith
http://blogs.mathworks.com/steve/2015/08/25/many-d65-values-to-choose-from/#comment-28196
Wed, 26 Aug 2015 03:02:16 +0000http://blogs.mathworks.com/steve/?p=1414#comment-28196OH man I hear you on this. While trying to grab some quick gold values as test cases for my color math library recently I became wayyyy too familiar with all the weird inaccuracies inside all the easy-to-find online color conversion tools. (“Oh, this tool is using an exact forward matrix for sRGB but rounded off the inverse matrix to 3 digits” — lots of variants on that one! or “oh this tool does conversion from 0-1 scale to the 0-255 scale by multiplying by 256, that’s… interesting”, …) I guess it doesn’t really matter in practice so long as you’re accurate to ~3 digits but aughhhhh. Color code is so sloppy!
]]>Comment on Ellipse visualization and regionprops by Arun
http://blogs.mathworks.com/steve/2015/08/17/ellipse-visualization-and-regionprops/#comment-28194
Tue, 18 Aug 2015 18:14:32 +0000http://blogs.mathworks.com/steve/?p=1401#comment-28194Nice Article.
]]>Comment on Typecast got faster in R2014b by Steve Eddins
http://blogs.mathworks.com/steve/2015/08/07/typecast-got-faster-in-r2014b/#comment-28185
Sun, 09 Aug 2015 14:53:21 +0000http://blogs.mathworks.com/steve/?p=1376#comment-28185Aslak—That’s exactly the way I use it.
]]>Comment on Typecast got faster in R2014b by Aslak Grinsted
http://blogs.mathworks.com/steve/2015/08/07/typecast-got-faster-in-r2014b/#comment-28184
Fri, 07 Aug 2015 20:59:34 +0000http://blogs.mathworks.com/steve/?p=1376#comment-28184I’ve found it useful when trying to get matlab to read binary files of mixed types. It is painfully slow to fread first 1 uint8, and then 4 doubles, followed by 2 uint16 and so on… It is much faster to read the whole chunk and typecast. Not a beautiful hack, but it works. Example here: http://www.glaciology.net/Home/Miscellaneous-Debris/loadingmolapedrfilesinmatlab
(other suggestions for how to solve these types of Problems are welcome)
]]>Comment on New Horizons Pluto Program Used MATLAB and Image Processing for Navigation by Chen Lin
http://blogs.mathworks.com/steve/2015/07/19/new-horizons-pluto-program-used-matlab-and-image-processing-for-navigation/#comment-28183
Thu, 06 Aug 2015 14:36:44 +0000http://blogs.mathworks.com/steve/?p=1371#comment-28183Awesome! Great job, MATLAB! Thanks for the detailed explanations, Steve!
]]>Comment on Get the MATLAB code by Jiro Doke
http://blogs.mathworks.com/steve/2015/07/15/get-the-matlab-code-2/#comment-28179
Fri, 17 Jul 2015 14:35:32 +0000http://blogs.mathworks.com/steve/?p=1365#comment-28179@Andreas,
If you want to run the commands incrementally, then the “MATLAB code” will be perfect if you put it into the MATLAB Editor. You can run each section (separated by %% ) individually by clicking on “Run and Advance” or “Run Section”.
]]>Comment on ICIP 2015 by Steve Eddins
http://blogs.mathworks.com/steve/2015/07/06/icip-2015/#comment-28178
Thu, 16 Jul 2015 11:26:36 +0000http://blogs.mathworks.com/steve/?p=1348#comment-28178Usha—Sounds like a good blog topic. I’ll put it on my list.
]]>Comment on Get the MATLAB code by Andreas
http://blogs.mathworks.com/steve/2015/07/15/get-the-matlab-code-2/#comment-28177
Thu, 16 Jul 2015 08:48:25 +0000http://blogs.mathworks.com/steve/?p=1365#comment-28177I haven’t. When I read your posts I copy & paste the commands box by box to Matlab. I do it incrementally to sync reading with executing the corresponding lines of code.
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