mongo projection

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

7.mongo command line run JavaScript scriptYou can manipulate the data and manage MongoDB by writing JavaScript scripts at the command line. For more information, see How to use the [Running. js files via a MONGO shell Instance on the Server] () in the MONGO script. Part.This article describes how to connect MongoDB by writing JavaScript scripts on the

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

Mongo-connector integrates MongoDB to Solr for incremental Indexing Configure the MongoDB replica set Deploy a replica set for testing and development Deployment replica set 1. create necessary data folders for each node: 1 mkdir-p/srv/mongodb/rs0-0/srv/mongodb/rs0-1/srv/mongodb/rs0-2 2. Run the following command to start the mongod instance: First node: Mongod -- port 27017 -- dbpath/srv/mongodb/rs0-0 -- replSet rs0 -- smallfiles -- oplogSize 128 --

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

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

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