Converts a color RGB image to a grayscale image, where the pixel value is converted to
Grayscale Value =0.2989 * R + 0.5870 * G + 0.1140 * B
The original color RGB image is a three-channel, converted into a single-channel grayscale image
You wrote a Python program that implements the conversion task:
#-*-Coding
Using Dephi for image processing can be a variety of methods, the most commonly used should be tbitmap, it provides easy access to the image, combined with canvas can be drawn line, draw a circle, image copy and other operations. However, in order to obtain a higher speed, we hope to read and write directly to the image
Reference: http://blog.csdn.net/cool1949/article/details/6649429 RGB image to grayscale image
Today in helping Li Na classmate read the code, suddenly thought of to scrutiny RGB image conversion to grayscale image principle. So began the story of this blog. As a little white, the elaboration may not be very specific a
Scale Image length and width to control Image File Size
Author:
Liu Peng
Date:
2010-11-08This article details how to adjust the image file size by scaling the image.
IntroductionWhen uploading images in some cases, the size of the image files will be limited, such
Reading Tips:
C ++ image processing SeriesCodeIt is clear and readable, and all uses C ++ code.
《Delphi Image ProcessingThe series focuses on efficiency. The general code is Pascal, and the core code is BaSm.
Make sure that the two items are consistent and can be compared with each other.
The code in this article must include "C ++ Image Processing-data t
This article mainly introduces the JSP realizes the image vibration effect, the flicker effect, the automatic switch image data, the nonsense does not say much, the concrete code is as follows:
1. Image vibration effect when the mouse pointer passes through the image
2. Picture Flicker Effect
3.
In general, we use Cvtcolor to convert an image to a grayscale image, but we can actually convert the image to grayscale when we read it.
Very simple operation, just want to imread the second parameter to 0 can be
As in the following code:
Cv::mat srcimage = Cv::imread ("Lakewater.jpg", 0);
The official description of the second parameter is as follows:
>0 r
Cropping an image
Once you have scanned an image and opened it in Photoshop, you can do the retouching. To begin, you use the Crop tool to crop the appropriate size of the picture so that it fits into the space designed for it.
1. On the Rectangle Marquee Tool button (), hold with the mouse key, and then drag to () and select. Then double-click the Crop tool to display its palette of options, select the fix
When phpmailer sends an image, it prompts that the image is successfully sent, but the image in the email is not shown as the question. The body format is HTML. I made an editing page and the image can be displayed on the editing page, however, the image is on an intranet se
uses JS to write a method, and then call this method in the image onmouseover event, so that when the mouse hovers over the small image, its large image will automatically display The picture query out, but also need to add a view of the large image function, and then use JS to write a method, and then in the
Upload images using AJAX, support image instant browsing, support JS image compression to the serverAjax uploads mainly use var reader = new FileReader () This methodJS image compression is mainly done using canvasSource:/** * js use form to upload images, support local preview of selected images, support to carry custom parameters * @param {string} params.previe
Upload | upload pictures | data | database *
AUTHOR:SHARPCN | Scorpion
Studio:www.bkwww.com
Copyright (c) 2004 Home tomorrow
Function: Will upload the picture to add security image watermark, and the picture directly written to the database, do not keep on the hard disk.
*/
involving namespaces
Using System;
Using System.Collections;
Using System.ComponentModel;
Using System.Data;
Using System.Data.SqlClient;
Using System.Drawing;
Using System.Drawi
Image processing-similar image recognition (histogram application) and image processing Histogram
Algorithm Overview:
First, histogram data is collected for the source image and the image to be filtered, and then the respective image
send code1. The first is to change the Inspector file (in fact this should be put last)Add an image selection box2. Add the corresponding attributes on the UIBasicSprite.cs3. Next change on the UISprite.cs, now onfill Riga mirror-like logic, too long, cut part:The logic here is based on your choice of image mode, such as the left and right words, calculate two times UV information, draw two uirect, here to
Image upload network blur How to do? believe that many friends have been to upload space or friends circle picture is very vague, this is how to do? How can you make the picture clear? The following small series for everyone to bring the picture upload blurred solution, together to see it.
Many children's shoes have such doubts, in space, microblogging, friends and other social platforms to upload or download photos, why the total feeling is not clea
An introduction to the image moduleCreate a new picture Python code image.new (mode, size) image.new (mode, size, color)
Image.new (mode, size)
image.new (mode, size, color)
Cascade PicturesCascade two pictures, Img2 and Img2,alpha is a floating-point number between [0,1], if 0, the effect is IMG1, if 1.0, the effect is img2. Of course IMG1 and IMG2 must be the same size and pattern. This function can make a beautiful effect, and the arithmetic plus
Copy CodeThe code is as follows:
involving namespaces
Using System;
Using System.Collections;
Using System.ComponentModel;
Using System.Data;
Using System.Data.SqlClient;
Using System.Drawing;
Using System.Drawing.Drawing2D;
Using System.Drawing.Imaging;
Using System.Web;
Using System.Configuration;
Method
public void AddUser (string personname, String personemail, String personsex, String Persondob, String personimage, String Personimagetype)
{
string strimagetype = UserImage.PostedFile.Conten
Symbian OS not only native support bitmap bitmap, but also can use Cimagedecoder class to encode and decode jpeg/gif/png type of image.
Cimagedecoder can be created from a file or created from a descriptor, see the SDK for a specific method of creation.
Cimagedecoder to be used in conjunction with active objects, the method used is simple:
void CImageHelper::LoadPngImageL(TDesC aFileName, CFbsBitmap* aBitmap, CFbsBitmap* aBitmapMask) { if (iImgDeco
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