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The following text and code is based on the how to scan images of OpenCV 2.4.13.0 documentation , lookup tables and time measurement with OpenCV section, English Good students can read the original text directly. 1. Color compression Color Reduction The simplest understanding is to reduce the number of colors that represent an image, and we all know that a 8-bit deep 3-channel RGB True color image includes more than 16 million (16777216) of the number of colors, In fact, in some ap

Basic ideas Take the information out of each pixel of the picture, the most important thing is to get the RGB value Convert each pixel from RGB to grayscale image, i.e. 0-255. To 0-255 grading, convert each level of pixel points to ASCII code, complete Implementing the first step: getting pixel informationThis requirement can be accomplished using the canvas's Getimagedata method, as followsCanvasId="Canvas" >Canvas>script> var c

A few days ago, I was in the Linux software, found a more fun software, called Aview, he can convert a picture into a text pattern. As a result, we recommend software to our colleagues. Gy classmates feel interesting, and then home with the script and program also made the same effect. The whole good, the old Wang two weeks ago just told you about the image processing and text recognition, so stir hot, with the previous program, add a few lines of code, on the same effect. Let's show you the res

----This digest from author ZYL910 's blogFirst, the basicFor color turn grayscale, there is a well-known psychological formula:Gray = r*0.299 + g*0.587 + b*0.114Second, integer algorithmIn practical applications, it is desirable to avoid low-speed floating-point operations, so integer arithmetic is required.Note that the coefficients are all 3-bit accurate, and we can scale them up to 1000 times times to implement an integer arithmetic:Gray = (r*299

First, the basicFor color turn grayscale, there is a well-known psychological formula:Gray = r*0.299 + g*0.587 + b*0.114Second, integer algorithmIn practical applications, it is desirable to avoid low-speed floating-point operations, so integer arithmetic is required.Note that the coefficients are all 3-bit accurate, and we can scale them up to 1000 times times to implement an integer arithmetic:Gray = (r*299 + g*587 + b*114 + 500)/1000RGB is generall

runtime according to the name. For example, a bank controller contract requests to a named controller contract ("Banka-data") to obtain a bank data contract address so that a bank controller contract can access the a bank data contract at run time. The main difference between it and the agent controller contract is that the service object is different, the agent controller contract is oriented to Dapp, and the name controller contract is oriented to the chain contract. In addition, the naming c

feature extraction process Please see the article at the end of the appendix).L Primary LBP calculation method (first, the multi-resolution, gray scale invariant, rotation invariant ^_^)Suppose we have a 3*3 window in which the values in the window represent the grayscale values of each pixel, as shown below:You can see that the grayscale value of the center pixel is 6, we compare the gray value of this ce

): This is an additional part of the scanner and is mainly used to assist in text scanning. You can perform a continuous scan of up to 50 pages of text pages. This accessory is usually used with optical character recognition software (OCR) instead of image editing programs like Adobe Photoshop. 　　 Bit: the smallest unit of storage in a computer. The bitwise value is 0 or 1. The more digits, the more complex the image information is. Example: Unit (Single-bit) The Unit image uses only one data b

Python computer vision and python vision This article comes from the book python computer visual programming. I am a beginner. If you find any errors in this article, please leave a message to me. Thank you. PIL Module The entire process of the PIL module isPython Imaging LibraryIs a free Image Processing Module in python. Open Image The PIL module is commonly used in its Image class. To open an Image, you must first import the Image class.from PIL import Image,Then callImageOfopenMethod.For ex

Chapter 3 image preprocessing 3.1 grayscale Transformation I. Definition of grayscale Transformation Definition of grayscale Transformation (vertex Operation) ★For input image f (x, y), grayscale T will generate an output image g (x, y), and g (x, y) the value of each pixel is determined by the value of the input pixel

of implementing the malicious PHP code in the image reconstructed in PNG format, And the conditions that need to be met. PNG file format, Imagecreatefrompng function parsing, modify picture, upload, file contains ... 0x01 PNG Picture format The PNG image to be rebuilt still contains malicious PHP code, first of all to have a basic understanding of the PNG image format. PNG supports three image types: indexed color images (INDEX-COLOR images), grayscale