Comments on: Gray scale pixel values in labeled regions http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/ Steve Eddins manages the Image & Geospatial development team at The MathWorks and coauthored Digital Image Processing Using MATLAB. He writes here about image processing concepts, algorithm implementations, and MATLAB. Sat, 11 Feb 2012 18:27:50 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Steve http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-23836 Steve Mon, 10 Jan 2011 13:35:13 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-23836 Sara—I don't understand your question. Can you clarify? Sara—I don’t understand your question. Can you clarify?

]]> By: sara http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-23832 sara Sat, 08 Jan 2011 00:57:38 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-23832 hi steve,the example shows on how to get the maximun pixel.can you help me on how to get the value for all pixels?i really need your help, tq vr much hi steve,the example shows on how to get the maximun pixel.can you help me on how to get the value for all pixels?i really need your help, tq vr much

]]> By: mogh http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-23388 mogh Fri, 20 Aug 2010 20:35:16 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-23388 hello sir can you help me,what i shoud do if the background of the original image (i.e. 'coins.png')was complex instead of uniform one? thanks hello sir
can you help me,what i shoud do if the background of the original image (i.e. ‘coins.png’)was complex instead of uniform one?
thanks

]]> By: Steve http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22398 Steve Fri, 04 Dec 2009 18:12:46 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22398 Manju@mdash;I suppose it depends on how you define "distance from center point to boundary." Center point can be identified by <tt>regionprops</tt>. The boundary locations of a region can be identified using <tt>bwperim</tt>, <tt>find</tt>, and the <tt>'Image'</tt> property returned by <tt>regionprops</tt>. Then you can use a function such as <tt>hypot</tt> to compute the distances between the center and each boundary location. Manju@mdash;I suppose it depends on how you define “distance from center point to boundary.” Center point can be identified by regionprops. The boundary locations of a region can be identified using bwperim, find, and the 'Image' property returned by regionprops. Then you can use a function such as hypot to compute the distances between the center and each boundary location.

]]> By: Manju http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22356 Manju Mon, 16 Nov 2009 14:06:56 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22356 well if we have a few ovals within each other like in a cell how do we measure the distance from the center point to the boundary of each region?How do we calculate individual regions? Thanks well if we have a few ovals within each other like in a cell how do we measure the distance from the center point to the boundary of each region?How do we calculate individual regions?
Thanks

]]> By: Steve http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22355 Steve Mon, 16 Nov 2009 12:32:16 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22355 Manju—What do you mean? How is each region defined? Manju—What do you mean? How is each region defined?

]]> By: Manju http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22352 Manju Mon, 16 Nov 2009 03:48:56 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22352 if we have 2-3 regions within each other how do we measure the regions of each one? if we have 2-3 regions within each other how do we measure the regions of each one?

]]> By: Steve http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22190 Steve Tue, 06 Oct 2009 11:16:04 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22190 Opcs—Here's basic assignment: <pre> % Replace element in row 5, col 6 with value 10 A(5, 6) = 10; </pre> You might also want to look at my posts on <a href="http://blogs.mathworks.com/steve/2008/01/28/logical-indexing/" rel="nofollow">logical</a> and <a href="http://blogs.mathworks.com/steve/2008/02/08/linear-indexing/" rel="nofollow">linear indexing</a>. Opcs—Here’s basic assignment:

% Replace element in row 5, col 6 with value 10
A(5, 6) = 10;

You might also want to look at my posts on logical and linear indexing.

]]> By: opcs http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22184 opcs Mon, 05 Oct 2009 21:11:25 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22184 sir,i have an image and want to perform some operations on selective pixels of the image, means to transform an image into different image. how to apply that function on that pixels, leaving remaining pixels unaffected in the resulted image ? I'm in new in matlab and have no more time to complete the assignment so please help me out thanx... sir,i have an image and want to perform some operations on selective pixels of the image, means to transform an image into different image.

how to apply that function on that pixels, leaving remaining pixels unaffected in the resulted image ?

I’m in new in matlab and have no more time to complete the assignment so please help me out

thanx…

]]> By: Steve http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22069 Steve Thu, 20 Aug 2009 16:17:31 +0000 http://blogs.mathworks.com/steve/2007/08/21/gray-scale-pixel-values-in-labeled-regions/#comment-22069 Varun—The convention followed by the Image Processing Toolbox is that gray-scale images represented as floating-point arrays have the range [0, 1], not [0, 255]. I recommend that you take a look at the intro sections in the Image Processing Toolbox users guide that describes the interactions between image type and data type conventions. Note also that the default display range can be overridden when you call <tt>imshow</tt> using this syntax: <pre> imshow(A, [0 255]) </pre> Take a look at the documentation for <tt>imshow</tt> for more details. Varun—The convention followed by the Image Processing Toolbox is that gray-scale images represented as floating-point arrays have the range [0, 1], not [0, 255]. I recommend that you take a look at the intro sections in the Image Processing Toolbox users guide that describes the interactions between image type and data type conventions. Note also that the default display range can be overridden when you call imshow using this syntax:

imshow(A, [0 255])

Take a look at the documentation for imshow for more details.

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