Map The Location Of All The Back Pixels In An Image?
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?
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.
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.
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).
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.
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!
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.
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?
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?
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..
Im trying to make a program that will automaticly do something for me so what i want it to do is record clicks from when u press f12 say for example till u press f11 then i want it to play them back when i click a button so it clicks automaticly in place where i recorded the clicks i also want it to play over and over again. Can anyone help me get started because im not sure where to start i dont know much about simulating mouse click and mousing mouse automatically and also i dont know how i would do the F12 and F11 thing.
I'm having a problem getting the src of the image the mouse is hovering over in a webbrowser. I can get an href just fine, just not an src. To get the href, I used this
im toying with an idea based round having controls end user movable at runtime, and having a function to save the current position/location of all the controls, so then i can skip through presets i already made as it were. Ill be using .ini files eventually (just testing with txt files to check it was a valid aproach) I can get all the info i need into the txt file, the problem is how to read it back into the app?
Trying to add a image by location. I have it working kinda but its not adding according to point location. I think i could use picture boxes to add it but Id preffer using a point click method were i dont have to make a picture box grid. Here is what I have so far.
Private Sub pb_Canvas_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles pb_Canvas.Click If ActiveTank = True Then
I wish to convert image 24bit RGB pictures to an RGB (or BGR) array of byte, and convert back array to RBG. I need speed, so I was suggested to use memorystreams, but have no idea where to start.
have this code: Friend Shared Function RGBArrayToImage(ByRef RGBArray() As Byte, _ ByRef Rows As Integer, _
In my database I have this "C:UsersLauraDesktopUni AnimationBluedot.gif" in a table called "images" and within a colomn called "image" I thought this code would work but I don't understand the error message I am getting. PictureBox1.Image = ds.Tables("Pipelining").Rows(inc).Item("image") If anyone could give me a hand that would be good
In my program there is a user image "avatar" & well any program with a avatar should allow the user to change his or her image "custom image" So my point is on load the PictureBox1.ImageLocation = ("FILEPATH")now i make a new form "form2" with two buttons (OK) (Cancel) & a TextBox
On OK_Click Form1.PictureBox1.ImageLocation = (Me.TextBox1.Text)
How can i make it save that file path so on load it loads that image?
How do I set the current image location in vb.net if I use the drag and drop even.It seems like the imagelocation doesn't work because I tried outputting the image location using messagebox. But it didn't show up anything. How do I get the image location of the file that I have just drop into the picturebox so that I could transfer it on another directory?
Private Sub pb_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles pb.DragDrop Dim FileToMove As String Dim MoveLocation As String Try
im making a program for a friend at the min where long story short in part of the program the user will press a button while they are viewing a web page in the standard web browser control, when the button is pressed i am trying to get the location of a image off the page into a string.
i was originally trying to go through the web page code one character at a time searching for "<img" tags but had no success. i have just seen the WebBrowser.Document.GetElementsByTagName
I am working on splitter control in winform, I want to insert the image in the splitter and make the image location to stay at the same place in the splitter when I am moving them.
When i am moving the splitter, the image will move around in winform which it is a messy.
Code: Public Class Form1 Private Sub Splitter1_SplitterMoved(ByVal sender As System.Object, ByVal e As System.Windows.Forms.SplitterEventArgs) Handles Splitter1.SplitterMoved
1. Image Resizing: The code takes the screen when you press the button and then save the image. My question is, how can I set the image size before saving?[code]
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I'm making a sciene program so I want to draw the graphic with decimal size and location. But the parameters are always integer, not decimal or double. Can I do that?What is big but light?
