Extract Transform And Rotation Matrices From Homography?
Sep 12, 2011
I have 2 consecutive images from a camera and I want to estimate the change in camera pose:
I calculate the optical flow:
Const MAXFEATURES As Integer = 100
imgA = New Image(Of [Structure].Bgr, Byte)("pic1.bmp")
imgB = New Image(Of [Structure].Bgr, Byte)("pic2.bmp")
grayA = imgA.Convert(Of Gray, Byte)()
[Code]...
How do I calculate the new position and lookat?
If I'm doing this all wrong or if there's a better method,
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Sep 16, 2009
I am having some major problems with the code in VBA and recording a macro didn't get me anywhere nor is the VBA help file. I have to have it so that I can input a values for the x axis rotation and the y axis rotation so that my 3d surface graph will rotate whatever values I input, the 3d surface graph will rotate those degrees. I also have to have a method for having the default rotation. I was also wondering how to put scroll bars for the x and y rotation. The only other thing I am having trouble with is having an input to check box for right angle axes. So far I have two cells for entering the x rotation value and the y rotation value. I also already have my 3d surface graph.
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Jan 12, 2011
I am trying to understand transformation matrices (not just their implementation in VB, but in general) and I've put about 3 full days into this so far. I believe I have the data in my matrices correct. Applying any single matrix to an array of points does a correct transformation.I am wondering if I understand how to combine multiple matrices into a single one.I understand you just have to multiply them together.I took this to mean you just have to multiply each element with its corresponding element in the second to make a third matrix?[code]
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Jan 29, 2011
I have created some 3d models(VB) for display in a WPF 3d Viewport and would like to rotate them. I would like to rotate them about an axis of rotation defined by a line through two 3d points. All the examples seem to rotate about one of X Y or Z axes and are not helpful for a more general approach. The angle of rotation is easily found. My maths is a bit rusty now so is there a function that would calculate the axis easily ?
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Dec 26, 2009
explain how Graphics.RotateTransform is working?
[Code]...
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May 19, 2009
I'm developing a sun shading analysis tool, and part of the analysis involves rotating a house (modelled as a cube consisting of 8 points) by the solar azimuth and solar altitude angles. The reason for this is to determine if the wall in question is facing the sun, and if so I run a shading analysis using a scanline algorithm to determine the percentage of wall plane that is in shade from a tree in the yard (this is modeled using overlapping 2D polygons). The purpose of the rotation and tilt of the object is so that the wall plane is directly perpendicular to the sun, so that the analysis can be done in 2D as opposed to 3D.
I first rotate each point of the house (which is stored in an array) through the azimuth, and then tilt it up through the solar altitude angle. I have set up my 3D coordinate system using the standard right-hand rule for orientation of the x,y,z axes. I'm using a basic rotation matrix as follows:For the azimuth, I am rotating around the z-axis, so I am using the following matrix transformation.
[x',y'] = [x*cos(azimuth) - y*sin(azimuth) , x*sin(azimuth) + y cos(azimuth)]For the altitude, I am rotating the object about the x-axis to tilt it up. I use the initial z-coordinate and the transformed y'-coordinate for the altitude tilt calculation.Each point, when completely rotated and tilted, will have a distinct set of coordinates: [x', y'', z'].Individually, the rotation and tilt work fine. But when I try to do them consecutively, I run into problems.
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May 3, 2012
I am first time working on PDF documents.I was searching on Rotation of a PDF page. I got some code samples regarding rotations by 90,180,270,360 degrees.
But my problem is that if there is a very small rotation required of the order of few degrees .. Is there any way that we can specify an angle using a slider bar or use the mouse to click and rotate the PDF page...
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Apr 1, 2011
I have a screen full of puzzle peices they are all rotated at different angles (90,180,270). is there a way to track the peices rotation? I was thinking of using a 2d array to store there rotation. however, I am using this code to rotate the peices:
[Code]...
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Jan 24, 2010
i'm developing a simple 2d animation program. my task is to get the center point of a rotation, for example: at the frame 0 there is a rectangle at x,y coordinates and with 0° of rotation at the frame 10 there is the same rectangle, translated and rotated what is the center point around which the rotation occurred? This is not really a question about programming, i know, rather than a problem of geometry.
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May 12, 2012
how to rotate image like 3d rotation?
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Jun 13, 2012
my question is regarding working out the direction of the smallest angle between two vectors in 2D. I am making a game in C++ where one of the obstacles is a heat seeking missile launcher. I have it working by calculating the vector between the target and bullet, normalising the vector and then multiplying it by its speed. However, I am now coming back to this class to make it better. Instead of instantly locking onto the player I want it to only do so only when the bullets vector is within a certain angle (the angle between the bullets vector and the vector bulletloc->target). Otherwise I want it to slowly pan towards the target by a degrees thus giving the player enough space to avoid it. I have done all this (in a vb.net project so i could simplify the problem, work it out then re write in in C++). However the bullet always rotates clockwise towards the target even if the quickest route would be counter clockwise. So the problem is working out the direction to apply the rotation in so the smallest angle is covered. Here is my code so you can try and see what I am describing:
Function Rotate(ByVal a As Double, ByVal tp As Point, ByVal cp As Point, ByVal cv As Point)
'params a = angle, tp = target point, cp = current point, cv = current vector of bullet'
[Code]...
I had was to work out the bearing of the two vectors and if the difference is greater than 180 degrees, rotate clockwise otherwise rotate counter clockwise
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Mar 12, 2011
SI like doing random things like 3D objects inside a windows form. With that said, I'm creating an application that will, eventually, write the code for me, after I do it myself visually.If you run the app it will make some more sense I guess.Now, to rotate the cubes, I'm using
.Transform.World = Matrix.RotationYawPitchRoll(CSng(CubeRx(1) / 10), CSng(-CubeRy(1) / 10), CSng(CubeRz(1) / 10))
now I do not want the world to rotate, just my individual cubes.Here's an example of me referring to my cube in action
If howmanycubes >= 1 Then
' vb2 = New VertexBuffer(GetType(CustomVertex.PositionNormalColored), 36, d, Usage.Dynamic And Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Default)
[code]....
how to apply textures to the cube.instructions:When running the program, type in values on right side and click create cube.before you click create cube again, those same text boxes will adjust your current cube.Then when you click create new, it places another cube ontop of your current cube, so you'll need to give it new values.Not much validation is going on so some bad values will cause crashes.
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Jun 4, 2009
What I need to do is query an iTextSharp AcroField to check if it is rotated, and if so capture the value of the rotation.So If I have the following field:
Dim af As iTextSharp.text.pdf.AcroFields = stamper.AcroFields
Dim afi As iTextSharp.text.pdf.AcroFields.Item
afi = af.GetFieldItem("fieldName")
What do I need to do to get the rotation (in degrees) of that specific field?
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May 31, 2010
I'm trying to build a dial control as a custom user control in VB.NET. I'm using VS2008.so far I have managed to rotate image using graphics.rotatetransform . however, this rotate everything. Now I have a Bitmap for the dial which should stay stable and another Bitmap for the needle which I need to rotate.so far i've tried this:
Dim gL As Graphics = Graphics.FromImage(bmpLongNeedle)
gL.TranslateTransform(bmpLongNeedle.Width / 2, bmpLongNeedle.Height * 0.74)
gL.RotateTransform(angleLongNeedle)[code].....
As I understand it, the image of the needle should be rotated at angle "angleLongNeedle" although i'm placing the rotated image at 0,0. However, the result is that the Needle doesn't get drawn on the control.
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Sep 1, 2009
How to find shift and rotation between same two images using programming languages vb.net or C++ or C#?
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Sep 1, 2011
I am using API calls to transform a Bitmap object. I have various physical transformations (rotation, flipping, scaling, displacement) as well as some colour adjustments (inversion, brightness and contrast)Everything works fine except for when I use the rotation or shear transformations in combination with the colour adjustment. In that case the colours revert to the original image.The interesting thing about this problem is that it seems to be dependent on the off-diagonal factors (eM12 and eM21 below) in the XForm matrix. For example, here is the rotation matrix:
Public Sub RotateClockwise(Radians As Single)
With XFormMatrix
.eM11 = Cos(Radians)[code]....
is there some way I can use both SetWorldTransform and SetColorAdjustment when using non-zero values for the off-diagonal factors in my XForm transformation?
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Oct 4, 2008
I am developing a game in compact framework. In Mobile Devices there is a button that Rotates the screen by 90 degrees so you can hold the mobile device the way that suits you. The problem is that i want to handle that in my game, so if i see that the screen has rotated the game will pause.
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Sep 7, 2011
What I am looking to do sounds really simple, but no where on the Internet so far have I found a way to do this in DotNet nor found a 3rd party component that does this either (without spending thousands on completely unnecessary features).Here goes: I have a jpeg of a floor tile (actual photo) that I create a checkerboard pattern with.In dotnet, it is easy to rotate and stitch photos together and save the final image as a jpeg.Next, I want to take that final picture and make it appear as if the "tiles" are laying on a floor for a generic "room scene". Basically adding a 3D perspective to make it appear as if it is actually in the room scene.Heres a website that is doing something similar with carpeting, however I need to do this in a WinForms application:Flor Website Basically, I need to create a 3D perspective of a jpeg, then save it as a new jpeg (then I can put an overlay of the generic room scene).
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Mar 18, 2009
I need to transform bitmap images with their 4 corner points moved from one location to another.Any code that can run on Windows, C#/VB.NET preferably, even help how to use scriptable programs like Paint.NET or Photoshop would be accepted
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Apr 6, 2011
Fourier Transform for pictures in Visual Basic?
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Nov 26, 2009
There is a bug in my code somewhere. It has a form with 5 input fields and 5 output fields. The algorithm is supposed to do a forward DFT and then immediately do a reverse DFT on the same data - so the output values should be the same. However it returns garbage! as I cannot see where the bug is.
[Code]...
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Aug 3, 2010
I am grabbing some XML from an API and I want to tranform it before I put it into my dataset. I can't quite piece it together. I am trying to work from the examples in the documentation, but all I find are examples with reading and writing to the filesystem and I am not interested in storing things in the filesystem for this.
I am trying to piece together (1) xmlReader.create(URL) -> (2) xslcompiledtransform(xmlreader,xmlwriter) -> (3) get xmlwriter it into an xmlreader -> (4)dataset.readxml(xmlreader).
I can't figure how to do (2) and (3). How do I initialize the xmlwriter properly and feed it to an xmlreader?
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Apr 8, 2012
After several hours of browsing google, wanted to check with one of you experts. I have made a winform application to read data from PABX (telecom) device. My application is listening to a particular port and once data received it passes to the data_hander. Application is working fine. But I�m facing a issue in received data string. From PABX system, it sends start and stop bit within the text string. It sends chr(2) as start bit and chr(3) as stop bit. But when my application reads the incoming data stream as follows,
ReceivedData = System.Text.Encoding.ASCII.GetString(bytes, 0, bytes.Length).Trim(Microsoft.VisualBasic.ChrW(0))
It does not recognize the start and stop bit as it sends from PABX. It just replace chr(2) and chr(3) with space and shows rest of the string. The issue is, I just want to take the same string and forward to another application and it needs this start and stop bits as it is to read the string properly. Could somebody guide me how to read this characters from PABX system or at least include them to the received string within my application as send to the other application?
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Feb 23, 2011
Using the FileHelpers library to do some great things in VB.NET. Parsing files with dynamic classes built from text file templates. One thing I can't find: A way to read in a single record and determine that it should result in the generation of two records.[code]Ideally in this next line I would like it to see certain conditions and be able to generate two records from a single source line. Dim PayRecords() As Object = engine. Transform Records(FromRecords)Alternately, if there is a way to implement the "ITransformable(Of ..." TransformTo() and have it return multiple records, I could put the logic in the dynamic class definition TransformTo() method.[code]
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Mar 29, 2011
Question: I have data that I retrieve from a database, which looks like this: Now I need to transform it to the below format, in order to be able to draw a piechart. In ReportingService, there is the Matrix control to achieve this, but what can I use to achieve the same in ordinary C#, in order to render it to a PieChart image ? Note that the number of buildings as well as the usage-types is variable and not known ahead of time.
[Code]...
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Mar 18, 2010
how to transform my textboxes to excel spead sheet within my programe
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Apr 16, 2012
I do have third party application which produce it�s reports in PDF format. Those reports are having images and different kind of alignments in the pages. So I need a code or guidance to make an application to transform the exact appearance of the PDF file in to Excel. My Issue is the PDF does not have table kind of thing to identify by regular pdf to excel conversions.
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Mar 30, 2010
I am a beginner of VB and i have no idea how to work on it.
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Jul 12, 2011
I am tying to get xslt2 transformation using XQSharp, but i get an exception when trying to call ApplyTemplates.[code]
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Mar 10, 2010
How can I transform this code to a function (anyone can do it for me?)? Otherwise I have to use this long code again and again..
[Code]...
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