There are two ways of using the Gluproject function:
Gldouble modelview[16]; Gldouble projection[16]; Gldouble out[3], in[3]; Assign value to in ... Glpushmatrix (); Glgetdoublev (Gl_modelview_matrix, Modelview); Glgetdoublev (Gl_projection_matrix, PROJECTION); Gluproject (in[0],in[1],in[2],modelview,projection,viewport, (out[0]), (out[1]), (out[2]));
Gluproject
SharpGL learning notes (3) Projection Transformation and viewpoint transformation, sharpgl learning notes
Starting from this section, we use the VS2010 extension of SharpGL to directly generate the SharpGL project.
If you do not see the following SharpGL project when creating a project, find a directory named "SharpGL 2.0 Visual Studio Extension" in the source code of SharpGL and install the directory named SharpGL. vsix vs2010 extension, and then re
Recently, I have been studying the meanshift tracking algorithm and encountered some concepts, such as the color histogram and reverse projection, which I don't understand. I hope I can be impressed by Baidu's search and summary.
(1) color histogram
Color features are the most widely used visual features in image search. The main reason is that color is often related to objects or scenes contained in images. In addition, compared with other visual fea
Hann Digital connected VR Experience Pavilion is expected to open in June this year, the project is mainly for children and adults in two different high-end consumer groups, the face of children's consumer groups mainly paint animation room.650) this.width=650; "Src=" Http://s4.51cto.com/wyfs02/M00/82/19/wKiom1dLzmDDHtGYAAKEjU7Uwmg314.png-wh_500x0-wm_3 -wmp_4-s_3053004329.png "title=" 2-16042q02pd12.png "alt=" Wkiom1dlzmddhtgyaakeju7uwmg314.png-wh_50 "/>Among them, the interactive
accessing objects in the value Stack:Common methods for accessing objects in the value Stack:Common methods for accessing actions in the value Stack:Static access method:Access static attributes:Static methods for accessing the Math class:Constructor for accessing common classes:Access List:Access an element in the List:Access the set of an attribute of an element in the List:Access the specific value in the set of an attribute of the element in the List: |Access Set:Access an element in the Se
Main content:
What is least squares
The geometrical meaning of least squares
Orthogonal projection matrix
What is least squares?Suppose we have n-pairs of data on our hands, {(Xi,yi): I=1...N}, in order to explore the relationship between the Y-variable and the X-variable, we want to match it with a polynomial, but how are the coefficients in the polynomial determined? It's definitely not going to work, and the least squares meth
Google Maps, Virtual earth and other network geographic use of map projection, often known as the web Mercator or spherical Mercator, its main difference with the conventional Mercator projection is to simulate the world as a sphere rather than ellipsoid.
What is Mercator projection?
Mercator (Mercator) projection, a
In OpenGL, if you want to manipulate the model, it is necessary to multiply the state of the model (the current matrix) by a matrix corresponding to this operation.If multiplied by the transformation matrix (translation, scaling, rotation), the position of the model is transformed after multiplying;If multiplied by a projection matrix (projecting a 2D plane), the projection of the model is set when multipli
It is customary to separate the layers so that they are understood. Of course, the more layer and layer properties, the greater the load on the machine. Here are three ways to figure out and the effect of a composite layer.
One or three methods of drawing
Here are some examples of path-gouging, lasso tools and magic wand.
If you want to be comfortable on the edge and not afraid of hard friends can use the path to pull the map, so that you can control the edge changes.
This article illustrates the Android triangle on Glsurfaceview based on OpenGL and the use of projection and camera view methods. Share to everyone for your reference, specific as follows:
Defining triangles
OpenGL allows us to use three-dimensional coordinates to define an object. Before we draw a triangle, we need to define the coordinates of its various points. We typically use arrays to store the coordinates of each vertex.
The OpenGL ES defaul
I've been playing the game industry for eight months now, the entry threshold of the game industry is low, so it is relatively easy to learn, summed up their own confused several points of knowledge, originally wanted to write out to beginners, rogue I was a lazy person, has been dragged to the present, finally resolved to move to the blog in black and white, I hope you like.
Projection transformation: I think this is the 3D to 2D transformation of t
Tags: http io os ar sp file data on CTIMongoDB projection means to select only the necessary data instead of selecting the entire data for a file. If a document has 5 fields, you need to display only 3, and then select only 3 fields.Find () methodMongoDB's Find () method, which is interpreted in the MongoDB query document, accepts the second optional parameter that is the list of fields to retrieve. In MongoDB, when the Find () method is executed, it
This article mainly introduces the Python Verification Code recognition tutorial using projection method, connected domain method segmentation picture, has a certain reference value, now share to everyone, there is a need for friends can refer to
Objective
Today this article mainly records how to slice the verification code, the main library used is pillow and Linux image processing Tools gimp. First, consider a fixed position and width, no adhesion,
OPENCV Study Notes (iv) projection Optionally a picture for testing, the picture is as follows:1#include 2#include 3 using namespacestd;4 using namespaceCV;5 intMain ()6 {7Iplimage * src = cvloadimage ("Cat.png",0);//forced conversion read image as grayscale graph8Cvshowimage (the grayscaleImage", SRC);9Cvthreshold (SRC, SRC,0,255, Cv_thresh_otsu + cv_thresh_binary);//greater than 0 take 255, otherwise take 0Teniplimage* Paintx = cvcreateimage (cvget
that the data is definedUsing the WGS84 datum, but you don't know which coordinate system it uses.
Projections
The earth isn't flat, and there is no simple way of putting it down on a flat paperMap (or these days a flat screen), so people have come up with all sorts of ingeniousSolutions each with their pros and cons. Some preserves area, so all objects haveA relative size to each other, others preserve angles (conformal) like the MercatorProjection, some try to find a good intermediate mix wit
1 -- Back Projection
CamShift is a motion tracking algorithm called "Continuously Apative Mean-Shift. It is used to track the color information of moving objects in video images. I divide this algorithm into three parts for ease of understanding:1) Back Projection Calculation2) Mean Shift Algorithm3) CamShift AlgorithmFirst, we will discuss Back Projection, and t
In the equisigned projection, there is no disappearing point. The observer's eyes are always parallel, and the Projection Direction and coordinate axis angle are fixed values. Although it looks slightly distorted, the stereoscopic effect is obvious in general, the important thing is that no matter where you place the stereoscopic image formed by the equisigned projectio
Hibernate, in addition to working with objects in a query result set, can use the results in the result set as rows and column sets, similar to how the data obtained through JDBC performs a select query. Therefore, hibernate also supports queries such as attributes, statistical functions, and GROUP by.To use Hibernate's projection statistics function, first obtain the Org.hibernate.criterion.Projection object from the Org.hibernate.criterion.Projectio
Projection in OpenGL
In OpenGL, the projection matrix specifies the size and shape of the visible area. For normal projection and Perspective Projection, they have their respective purposes.
Forward projection
It is applicable to 2D graphics, such as text and architectural
1. What is the role of reverse projection?Reverse projection is used to find the most matched point or area of a particular image (usually smaller or only 1 pixels, hereinafter referred to as a template image) in the input image (usually larger), that is, where the positioning template image appears in the input image.2. How Reverse projection WorksThe way to fin
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