Distance Between Two Points On An Image In Terms Of Pixels?
Jun 1, 2012
I'm using Visual Basic 2006 and i'm a newbie so excuse me if my question is not complete. I basically have a picturebox, in which i am displaying an image from a webcam. Now the user clicks on two points on the image and i need to get the distance between the two points in terms of the number of pixels. I did think of and try the pythagorean theorem, but i'm confused as to what units the answer turns out in. Is it in terms of inches? or pixels? Do i need to set the Scale Mode propety to pixels to get it in pixels? And if so, is there a way to get the number of pixels per inch? Sorry for asking so many questions but i've been reading other forums and i'm confused!
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Sep 30, 2011
On forms size and such, is it in points or pixels? I'd assume pixels, however, it seems when i make a image that is in the same size, (i put the size as the dimensions for pixels), the image seems not the same size. I'm unsure of how big a "point" is, but i am aware of a pixel.
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Sep 5, 2009
I'm sure some of you know the equation to get the distance of 2 points on a coordinate grid, and I'm making a program to do just that, the only problem is that when I use the square root function it doesn't return an exact number, what's wrong with my code?[code]...
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Apr 12, 2012
i am having a problem in building up a VBcode for getting the minimum distance between a set of coordinate points. what actually i an trying is to find the minimum distance between one set of coordinate points(A(x1,y1),Bx2,y2),C(x3,y3),D(x4,y4),E(x5,y5)) with respect to another set of CO-ord points (i(x1,y1),j(x2,y2),k(x3,y3),l(x4,y4),m(x5,y5))..
ublic Function DoSearch(ByVal SearchCritera As Bracket, ByVal ListToSearchFrom As System.Collections.Generic.List(Of TRacksDefinitions.Racks.Bracket)) As System.Collections.Generic.List(Of TRacksDefinitions.Search.SearchBracket) Implements TRacksDefinitions.Search.ISearch.DoSearch
[code]....
the above is code which i have created till now and the next step is calculating the mindistance criteria..search criteria . rear points is the one we get frm solidworks and b.rearpoints is the one present in database we compare both of them find the one which is very similar to the one in database..
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Mar 18, 2006
Is there a way of converting pixels to points? The dimensions in VB are in pixels, but Office COM such as WordApp.Resize are expressed in points. So trying to align app windows is a mess.I guess the ratio of pixels to points varies from one monitor to another(?), so this would need to be calculated at run time.I tried a nifty trick of doing Me.Font.SizeInPoints / Me.FontHeight but that doesnt seem to be quite right or a very sensible way of doing it.
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Jul 27, 2009
I'm trying to make a -what i thought would be simple app.My intention was to build program that:1) i'd provide a grayscale image2) the program would count the black pixels the grey pixels the more grey pixels etc. (the hue) and the white3) would make the percentage sum of all pixels, that is: 300.000 black pixels (rgb 0 0 0) etc. given that 0 is the black, 100 the white. e.g a simple grayscale image is 55.2 white
This was my way and i don't think that is useful:
First of a button to convert the image to greyscale:
Dim bm as new Bitmap(source.Width,source.Height)
Dim x
Dim y
[CODE]...
Secondly, -and that's the stupid way- i did -or better i wanted to do- this: i put the code to dynamically create labels, each label having the colour of a pixel as background colour and as text the colour converted to rgb
The third step which i intended to do (i couldn't get pas two) was to sum up the labels etc.
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Nov 11, 2011
How can we get the pixels of an image in a fast way?
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Feb 22, 2010
how can i get a full code or full information how to work with image and pixels i want to work with image by pixels as integer number not as color?
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Nov 23, 2010
I need to read 10 images in 1 folder and do feature extraction onto 10 images.Does anyone can suggest any good edge detection by using C++ / VB.Net / C# language? After I can successfully detect the edge and write a new image file (in this case is generate 10 new edge detection filtered images, only black and white line image) within the same folder.Then lastly, I do not know any distance measurement able to calculate distance between each edge detection filtered-images (not the original image) and show the result in graph.How can read those images back and get the data of the edge?Keywords are edge detection and distance measurement.
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Dec 17, 2010
You could check to see if the distance across the form minus the distance across the picture box is equal to the horizontal location of the picture box to see if it's on the right side. For the left side, just check if the horizontal location of the picture box is 0.
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Nov 22, 2010
I am looking to remove groups of pixels that are less than 10x10 in size. The pixels are generated from scanned fax reports and are solid black, so they should be able to weed out easily. Our fax machine is rather old, and it generates random block dots along our documents. In other words, I have several images with random solid black dots that need to be removed.
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May 28, 2012
what would be the fastest (best) way to make transparent all pixels in one image that are white on other image?
Let's say that have 2 transparent images (.png) and want to delete some portion of the first image. Pixels to be deleted (made transparent) are defined as white on the other image (some kind of deleting mask).
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Jun 9, 2011
I need to map the location of all the back pixels in an image into some kind of structure. The program later uses the structure to select a random pixel location. It then removes the location, to prevent it being used again. The problem is, there is a huge number of black pixels (close to 40,000) so an ordinary array takes forever to search for and eliminate the "used" pixels. Is there some other "Faster" data structure?
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Oct 14, 2009
I have an Image object. I'd like to save that image on my hard disk, using a specific resolution. As a default, the image is saved in 640X480.
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Dec 16, 2009
I come straight to the point without going too far. I need to scan all the pixels of a generic image and for each pixel derive the RGB components. I started with the following function that performs its task very good and returns 3 array (R, G, B) with the different values, but unfortunately is too slow.
[Code]...
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Aug 18, 2008
How can I evaluate pixels within a Binary Image?What I have done so far is to take the image and use it's "getPixel" method and do a comparison of this pixel to black/white. But that can't be right... Can it? It's a binary image, I should be evaluating each pixel as true/false. Correct?
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Apr 26, 2011
I'd like to check for all colors in an image. I've already came up with this:
Code:
Dim lst As New List(Of Color)
Dim img As Bitmap = System.Drawing.Bitmap.FromFile("C:image.jpg")
For x = 0 To img.Width - 1
[code]....
Unfortunately this needs to sweep through all the pixels, and it's EXTREMELY slow... method to get all colors in an image without sweeping through all pixels?
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Oct 13, 2010
I want to programatically delete some pixels that are unused in order to reduce the image size.Can anyone tell me how to reduce the size of an image file without changing the pixels values..
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Jun 21, 2012
i want to create image with width and height 64 and set all pixels to black
dim b as bitmap
b.width = 64
b.height = 64
[code]....
the code not working
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Jul 7, 2009
It is possible to find the points of a part of image example, do I have a photography of a castle where there is a flag, manage to find where is the flag positioned to runtime?
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Feb 9, 2011
Below is some code. Note the comment "SOULD BE -1" If I make it -1 I get the message that I'm trying to write into protected memory.
Not on all images but a few that I tested.It appears that inBitmap.Height points to non-image data.
1)Can you tell me what is wrong and how to fix it?
2)Or how to test so I don't crash.
[Code]...
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Mar 30, 2012
assuming i have an isoceles triangle, where i know the height + base width, how
can i calculate the width of that triangle at 1/3 of the distance from the point + 2/3 of the distance from the point?
i thought it'd be simply 1/3 base width + 2/3 base width, but my drawing is +/- a few pixels when i resize it?
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Apr 20, 2010
is there a way to offset the points in a polygon without having to change each one individually the points are in an array
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Apr 9, 2010
How is VB6 Different from VB.NET in terms of Syntax? what is their relationship and major differences?.
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May 13, 2010
Having read this page, I can't believe that VB.Net has such a terrible performance when it comes to I/O.Is this still true today? How does the .Net Framework 2.0 perform in terms of I/O (that's the version I'm targeting)?
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Jan 17, 2009
While for the most part you can generate the same MSIL, there are definitely differences in tooling. PEX, for example, works much easier with C#.
What Microsoft or 3rd party tools don't work equally well for both languages?
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May 10, 2009
When someone else install my program on another computer, how do i get a professional setup with terms and so on??
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Jan 31, 2010
how can i get the points which make a polygon from a region which was derived from the polygon's points?
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Jun 3, 2010
I am using VS2008 and VB.NET. Can someone provide or point me to info on how to add a Terms and Conditions form to an installation? The user would have to accept in order for the installation to continue or else cancel installation.
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Feb 8, 2009
Are the terms 'Function' and 'Procedure' synonomous?
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