C#

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For image processing experts haytham_mohammad10-Dec-05 3:06 haytham_mohammad 10-Dec-05 3:06  I would like to know why we write this formula to change from color to Grayscale picture The formula is p[0] = p[1] = p[2] = (byte)(.299 * red + .587 * green + .114 * blue); thanks in advance haitham Re: For image processing experts rob tillaart10-Dec-05 5:08 rob tillaart 10-Dec-05 5:08  The different colors have a different brightness, red and blue are perceived darker as darker colors. I assume it has to do with the fact that red and blue are on the ends of the visible spectrum while green is in the middle. regards, rob tillaart Re: For image processing experts haytham_mohammad10-Dec-05 6:33 haytham_mohammad 10-Dec-05 6:33  i know that this code convert the perceived bytes of the RGB to be within the domain 0-->255 and the rgb saved as 24byte per pixel i.e 3 * 8 bytes in other words red take byte blue takes byte etc so my question why we multiply the red color by the number (.299) specifically and of course the remaining numbers thanks for ur attention. haitham Re: For image processing experts Stanciu Vlad10-Dec-05 8:09 Stanciu Vlad 10-Dec-05 8:09  Converting a image to a grayscale has no standard. Mostly on the internet you will find this forumla givven by the NTSC standard GS = 0.3*R + 0.59*G + 0.11*B These scaling values (0.3, 0.59, 0.11) can variate. Their main purpose is to sum up to a property (luminance) of the givven color. The final color is from the grayscale because you set all the 3 bytes to the same value. Try using other scaling values in your ConvertToGrayscale procedure and observe the diferrences.- of course that the standard values haven't been found through experimentation, a good image processing skil is required and if I m not mistaking phisics is needed too in order to get to a such result. protected internal static readonly ... and I wish the list could continue ... Re: For image processing experts rob tillaart11-Dec-05 1:20 rob tillaart 11-Dec-05 1:20  http://www.pjb.com.au/comp/colours.html#item_rgb2gray[^] states it comes from the NTSC video standard. "The above invocation causes the r g b colour to be converted to its equivalent gray value, which is then left on the stack. The conversion follows the NTSC video standard, which determines how a colour television signal is rendered on a black and white television: gray = .3 * red + .59 * green + .11 * blue" http://www.netnam.vn/unescocourse/computervision/12.htm[^] has some more background about different color spaces. regards rob Re: For image processing experts Ista11-Dec-05 14:33 Ista 11-Dec-05 14:33  You know they provide an imaging namespacing to do this math so as specifications change your code will not. And the Color object can convert values for you I'm not an expert yet, but I play one at work. Yeah and here too. Re: For image processing experts haytham_mohammad12-Dec-05 3:18 haytham_mohammad 12-Dec-05 3:18  DO u mean that the color object consists a method to convert the picture from color to grayscale or any specific format? i didnt try it yet but i think that it will be slower than we handle this ourselves thanks for ur help haitham Re: For image processing experts Ista12-Dec-05 3:22 Ista 12-Dec-05 3:22  no,but there is an imaging namespace that would be more effecient, unless you do the processing in C++ I'm not an expert yet, but I play one at work. Yeah and here too. Re: For image processing experts haytham_mohammad12-Dec-05 18:42 haytham_mohammad 12-Dec-05 18:42  how can i know the capabilities of the imaging name space and i want to know also if there is any book talk about the image processing in c# or handle the image processing methods of matlab in c# thanks in advance haitham Re: For image processing experts Ista13-Dec-05 2:28 Ista 13-Dec-05 2:28  a link to using matlab http://www.codeproject.com/dotnet/matlabeng.asp[^] in c# Just create an image and use the System.Drawing.Imaging namespace. Use your Object Browser to view the objects you can use. Nick I'm not an expert yet, but I play one at work. Yeah and here too. request:source code sachappi10-Dec-05 2:30 sachappi 10-Dec-05 2:30  hello everybody..can someone help me in finding the source code in c# for my major project..my topic is "IMPLEMENTATION OF VIRTUAL PRIVATE NETWORK USING LOGICAL TUNNELING"..actually i found a software on net similar to my project..the name is AccessPoint SSL VPN software..but i am not able to download the toolkit version 1.1 from freedownloadscentre..can someone please help me out..thanx in advance..God bless u all.. spider hi guys i am spiderman Re: request:source code Colin Angus Mackay10-Dec-05 7:22 Colin Angus Mackay 10-Dec-05 7:22  I would have thought that VPN software would more commonly be found lower down than C#. I would have said that implementations would most likely be written in C or C++ and be written as a driver rather than in a high level C# application. My: Blog | Photos "Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious Re: request:source code Jared Parsons10-Dec-05 18:55 Jared Parsons 10-Dec-05 18:55  My guess is the professor made the assignment in C# so people couldn't download existing work off of the web Jared Parsons jaredp@beanseed.org http://spaces.msn.com/members/jaredp/ Re: request:source code Bahadir Cambel10-Dec-05 10:32 Bahadir Cambel 10-Dec-05 10:32  I think you could take a look at sourceforge.net http://sourceforge.net/search/?words=VPN&type_of_search=soft[^] ComboBox query? MudkiSekhon10-Dec-05 1:39 MudkiSekhon 10-Dec-05 1:39  In Windows forms application, while using Combobox, is that possible that I use text to display while in background for storing those values, i use numeric values and vice versa? Thanks, Sandeep +919891027854 Re: ComboBox query? monrobot1311-Dec-05 14:34 monrobot13 11-Dec-05 14:34  I'm not 100% sure, but I'd take a look at the DisplayMember and ValueMember properties of the ListControl that might be what you're looking for. - Aaron Re: ComboBox query? MudkiSekhon11-Dec-05 17:34 MudkiSekhon 11-Dec-05 17:34  Yes, I am looking for the same . But how can we use this property in a Combobox? Thanks, Sandeep +919891027854 Re: ComboBox query? MudkiSekhon11-Dec-05 18:17 MudkiSekhon 11-Dec-05 18:17  I have a Hashtable. I want to display the key names of that Hashtable in Combobox whereas I want to use corresponding key values as ValueMember of that Combobox Thanks, Sandeep +919891027854 Re: ComboBox query? monrobot1312-Dec-05 8:20 monrobot13 12-Dec-05 8:20  I don't know if you'll be able to do it with a HashTable as the ValueMember and DisplayMember properties work in conjunction with the DataSource property, which only accepts IList (list ArrayList for example) and IListSource. What you could do is change your HashTable to an ArrayList that holds a user-defined type. If you look at ListControl.ValueMember[^] it has a good example. - Aaron creating a progress dialog box steve_rm10-Dec-05 1:18 steve_rm 10-Dec-05 1:18  Hello, I am having trouble with creating a progress dialog box. I have to retrieve some information from a database and l want to display a dialog box with a progress bar, that increments the time it takes to get all the data. //Click retrieve information from the database. //Display dialog box until all data is retrieved. //Display the data in the datagrid. I am having trouble with the dialog box part. Is there an easy way to do this. Many thanks in advance, Steve Re: creating a progress dialog box Polis Pilavas10-Dec-05 2:54 Polis Pilavas 10-Dec-05 2:54  Take a look here[^]. Even though it deals with ADO.NET v2.0, it's quite similar to your case and it explains how to increment the progressBar control according to the records in your table. Regards, Polis Can you practice what you teach? send me huffman coding in c# latif ullah khan9-Dec-05 23:34 latif ullah khan 9-Dec-05 23:34  send me huffman coding in c# latif ullah Re: send me huffman coding in c# Guffa10-Dec-05 0:18 Guffa 10-Dec-05 0:18  Google is not evil.[^] --- b { font-weight: normal; } Re: send me huffman coding in c# Jared Parsons10-Dec-05 18:56 Jared Parsons 10-Dec-05 18:56  Send me money in a bag. Jared Parsons jaredp@beanseed.org http://spaces.msn.com/members/jaredp/ -- modified at 5:34 Sunday 11th December, 2005 Re: send me huffman coding in c# Dave Kreskowiak11-Dec-05 3:36 Dave Kreskowiak 11-Dec-05 3:36  Carefull! He might send you a bag of money worth $.05 cents! RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

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