convert to grayscale

Category: OpenCV "Q1" how to convert a color picture to a grayscale with a pixel value of only 0 and 255 with OPENCV? Grayscale, iplimage* pImg = Cvloadimage ("C:\\1.bmp", 0); So the image has been grayscale and then called cvthreshold(image, image, 255, cv_thresh_binary); Yes, 125 there is the threshold yo

) * 16, dwbytewritten, null );// File dataWritefile (hnewfile, pnew, dwnewsize, dwbytewritten, null ); Delete [] pbuffer;Delete [] pnew; // Close the file handleClosehandle (hnewfile );Closehandle (hfile ); Return true;} 4. Questions Since a 24-digit real-food image can be converted into a 4-digit grayscale image, there must be a proper way to convert it into a 4-digit color image. The specific difference

Android-convert an RGB color image to a grayscale image Instance: RGB2Grey Project running: Source code: [Java]Public class MainActivity extends Activity {/* (Non-Javadoc)* @ See android. app. Activity # onCreate (android. OS. Bundle)*/@ OverridePublic void onCreate (Bundle savedInstanceState ){Super. onCreate (savedInstanceState );SetContentView (R. layout. activity_main );// Obtain the reference of th

Instance: RGB2Grey Project running: Source code: [Java]Public class MainActivity extends Activity { /* (Non-Javadoc)* @ See android. app. Activity # onCreate (android. OS. Bundle)*/@ OverridePublic void onCreate (Bundle savedInstanceState ){Super. onCreate (savedInstanceState );SetContentView (R. layout. activity_main );// Obtain the reference of the component in the interface by IdButton rgb2greyBtn = (Button) findViewById (R. id. rgb2greybtn );ImageView imageView1 = (ImageView) findViewById

:/cygwin/android-ndk-r4-crystax.4, run Cygwin, through the CD command to go to the ndk/samples/example directory/, run $ndk/ndk-build to compile the directory Android.mk Here's a personal habit. 5, install Eclipse CDT, the official Download CDT installation package, decompression after plugins and feagures copy overlay to eclipse folder can 6, go to the System Properties-> environment variable->path add "D:/cygwin/bin" (assuming Cygwin installed in D: under) and "D:/cygwin/android-ndk-r4-crys

Example: Rgb2grey Project Operation Effect Chart: Source Code : [Java]public class Mainactivity extends activity {/* (Non-javadoc)* @see Android.app.activity#oncreate (android.os.Bundle)*/@Overridepublic void OnCreate (Bundle savedinstancestate) {Super.oncreate (savedinstancestate);Setcontentview (R.layout.activity_main);Get references to components in the interface by IDButton rgb2greybtn = (button) Findviewbyid (R.ID.RGB2GREYBTN);ImageView ImageView1 = (imageview) Findviewbyid (R.ID.I

In Qt, we sometimes need to change the color of the Qimage class to grayscale, at first I was thinking of using the Qimage member function Converttoformat(), but tried a lot of parameters, the return to the conversion of the picture is a problem, not what we want gray-scale image, If you have successfully converted a grayscale image using the member function, please write your method in the comment area and

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

//read data from video files--convert data to grayscale--candy edge detection for images//Sandy//Time: 2015-10-10#include #includeintMainintargcChar*argv[]) { //preparatory workcvcapture* Capture=cvcreatefilecapture ("E:\\videos\\xx.avi");//to point the capture variable to a video file if(!capture)return-1;//Check if the function is successful//Read the video//method One: Use Cvgrab (Grab) Frame () to

I'm trying to use the matplotlib read RGB image and convert it to grayscale.In MATLAB, I use this: 1 img =rgb2gray(imread(‘image.png‘)); In the Matplotlib tutorial they did not cover it. They just read in the image 12 importmatplotlib.image as mpimgimg =mpimg.imread(‘image.png‘) Then they slice the array, but this is not from what I know to convert