Despair's profile - activity

Okay so after a few hours of reading trying and failing, I've come to an conclusion that this can't be done.

Simple solution is : make a new bigger image and use the Region Of Interest to copy all the images you want to the bigger image and then display it.

Though I still have no idea how to move the Slidebar to a fixed position by window size :O

Hi, I've tried creating a window that will display 2 images in it so I opened a new window using autosize ( that from what I read keeps the images size and prevents them from being fit to the window) but still all i have is 1 big image.

Goal : Displaying the current displayed picture on the left side of screen and a secondary image on the right side of the screen. ** the window will be set to be FULLSCREEN

*could use a suggestion about the way I open the window to be full screen and images the same size they started with * this is what I have so far:

#include "highgui.h"
#include "cv.h"
#include <iostream>
#define FILENAME "picture.jpg"
#define WINDOWTITLE "Image To Ascii"
int beta=255;

IplImage* img_gray=NULL,*img_gray_smaller=NULL,*img_gray_regular_size=NULL,*img_gray_modify=NULL;

void onTrackbarSlide(int pos){
    img_gray_modify=cvCreateImage(cvSize(80, 60),IPL_DEPTH_8U,1);
    cvCopy( img_gray_smaller, img_gray_modify, NULL );
    int inc=(pos<255)? 255-pos: -255+(510-pos);
    cvSetImageROI(img_gray_modify,cvRect(0,0,80,60));
    cvAddS(img_gray_modify, cvScalar(inc),img_gray_modify);
    cvResetImageROI(img_gray_modify);
    img_gray_regular_size=cvCreateImage(cvSize(800, 600),IPL_DEPTH_8U,1);
    cvResize(img_gray_modify,img_gray_regular_size,CV_INTER_NN);
    cvReleaseImage(&img_gray_modify);
    cvShowImage(WINDOWTITLE, img_gray_regular_size);
}

int main(){
    char c='a';
    img_gray=cvLoadImage(FILENAME,CV_LOAD_IMAGE_GRAYSCALE),
    img_gray_smaller=cvCreateImage(cvSize(80, 60),IPL_DEPTH_8U,1),
    cvNamedWindow(WINDOWTITLE, CV_WINDOW_AUTOSIZE | CV_WINDOW_NORMAL);
    //cvResizeWindow(WINDOWTITLE,800,600);
    cvCreateTrackbar("brightness", WINDOWTITLE, &beta, 510, onTrackbarSlide);
    while(true){
        c=cvWaitKey(0);
        if (c==27)break;
        if (c==32){
            cvReleaseImage(&img_gray_smaller);
            cvReleaseImage(&img_gray);
            cvReleaseImage(&img_gray_regular_size);
            img_gray=cvLoadImage(FILENAME,CV_LOAD_IMAGE_GRAYSCALE);
            img_gray_smaller=cvCreateImage(cvSize(80, 60),IPL_DEPTH_8U,1);
            cvResize(img_gray,img_gray_smaller,CV_INTER_LINEAR);
        }
        cvShowImage(WINDOWTITLE, img_gray_regular_size);    
    }
    cvReleaseImage(&img_gray_smaller);
    cvReleaseImage(&img_gray);
    cvReleaseImage(&img_gray_regular_size);
    cvReleaseImage(&img_gray_modify);
}

• another thing : is there an efficient way to move the Trackbar to the bottom of the screen no matter which resolution i use?

Thanks alot. I have the Oreilly opencv book and I went back to that chapter didnt notice the FIRST WINDOW !! part :)

thanks again!

Hi, I've written the following code and I bumped into a few problems/questions.

First problem: Trackbar isnt showing. Second: is the ROI configured properly?

The thing is I want the Trackbar to start from the middle ( as 255 means no change to brightness ) and the image will change accordingly .

Anyways at the moment only the window loads and no images load since I want the image to load on screen only when the user changes the Trackbar position.

Thanks.

#include "highgui.h"
#include "cv.h"
#include <iostream>
#define FILENAME "picture.jpg"
#define WINDOWTITLE "Image To Ascii"
int beta=255;

IplImage* img_gray=NULL,*img_gray_smaller=NULL,*img_gray_regular_size=NULL,*img_gray_modify=NULL;

void onTrackbarSlide(int pos){
    *img_gray_modify=*img_gray_smaller;
    int inc=(pos<255)? 0-pos: 510-pos;
    cvSetImageROI(img_gray_modify,cvRect(0,0,80,60));
    cvAddS(img_gray_modify, cvScalar(inc),img_gray_modify);
    cvResetImageROI(img_gray_modify);
    img_gray_regular_size=cvCreateImage(cvSize(800, 600),IPL_DEPTH_8U,1);
    cvResize(img_gray_modify,img_gray_regular_size,CV_INTER_NN);
    cvReleaseImage(&img_gray_modify);
    cvShowImage(WINDOWTITLE, img_gray_regular_size);
}

int main(){
    cvCreateTrackbar("brightness", WINDOWTITLE, &beta, 510, onTrackbarSlide);
    char c='a';
    img_gray=cvLoadImage(FILENAME,CV_LOAD_IMAGE_GRAYSCALE),
    img_gray_smaller=cvCreateImage(cvSize(80, 60),IPL_DEPTH_8U,1),
    //img_gray_regular_size=cvCreateImage(cvSize(800, 600),IPL_DEPTH_8U,1);
    cvNamedWindow(WINDOWTITLE, CV_WINDOW_AUTOSIZE);
    cvResizeWindow(WINDOWTITLE,800,600);
    while(true){
        c=cvWaitKey(0);
        if (c==27)break;
        if (c==32){
            cvReleaseImage(&img_gray_smaller);
            cvReleaseImage(&img_gray);
            cvReleaseImage(&img_gray_regular_size);
            img_gray=cvLoadImage(FILENAME,CV_LOAD_IMAGE_GRAYSCALE);
            img_gray_smaller=cvCreateImage(cvSize(80, 60),IPL_DEPTH_8U,1);
            //img_gray_regular_size=cvCreateImage(cvSize(800, 600),IPL_DEPTH_8U,1);
            cvResize(img_gray,img_gray_smaller,CV_INTER_LINEAR);
            //cvResize(img_gray_smaller,img_gray_regular_size,CV_INTER_NN);
        }
        cvShowImage(WINDOWTITLE, img_gray_regular_size);    
    }
    cvReleaseImage(&img_gray_smaller);
    cvReleaseImage(&img_gray);
    cvReleaseImage(&img_gray_regular_size);
    cvReleaseImage(&img_gray_modify);
}

img_gray=cvLoadImage(FILENAME,CV_LOAD_IMAGE_GRAYSCALE);
img_gray_smaller=cvCreateImage(cvSize(80, 60),IPL_DEPTH_8U,1);
img_gray_regular=cvCreateImage(cvSize(800, 600),IPL_DEPTH_8U,1);
cvResize(img_gray,img_gray_smaller,CV_INTER_LINEAR);
cvResize(img_gray_smaller,img_gray_regular,CV_INTER_NN);
cvShowImage(WINDOWTITLE, img_gray_regular);

the nearest is the NN part? i've just changed it to this and it does look better, can see the pixles. though still i think it can look a bit better, is it the linear part maybe?

Thanks for your help!

Hi, I've been trying to manipulate an 800x600 image to be 80x60 image ( kinda pixalated ) and grayscaled but to be seen as 800x600 size

what I do is the following:

img_gray=cvLoadImage(FILENAME,CV_LOAD_IMAGE_GRAYSCALE);
img_gray_smaller=cvCreateImage(cvSize(80, 60),IPL_DEPTH_8U,1);
img_gray_regular=cvCreateImage(cvSize(800, 600),IPL_DEPTH_8U,1);

which is loading the image as grayscale to begin with resizing it to 80x60 and then resizing it again to 800x600

but it doesnt look very well, any suggestions on

How to look at a low resolution image magnified to 800*600?

(maybe its the depth? the channels? tried mixing with those but the program fails)

awesome thanks

First, thanks for answering.

Yes, I have the library folder set in the C++ Directories menu. Also it is set in the additional libraries (inside the linker menu). And finally in the linker input menu there are all the lib files (Additional Dependencies)

any idea what i might be forgetting? :O thanks!

retried again and still linker errors... could it be because i have VS2012 installed also?

still fails to load, now i have linking issues also.... guess i should try the windows32bit install ? :(

Yes I have. All except step number 3 that says to choose a build, because I can't find where to select one. All I see in Downloads are 2.4.1 - nothing about 64/32 bit there

thanks though

you think if i install a second OS ( windows 7 32 bit) i wont have those troubles? is it worth trying>?

using Windows 7 64bit sp1. Visual Studio 2008 vc9 (got 64bit redistribution installed)

been googling for many hours , reinstalled opencv a few times , with different versions.

so far I found out that this error is caused by 32bit - 64bit encounter.

I downloaded Dependency Walker and checked my debug exe it had a few "cannot find" messeges MSVCP80D.dll, MSVCR80D.dll , IESHIMS.dll and TBB_DEBUG.dll

so I tried to get those files into the project folder. downloaded the first 3 and got the tbb_debug from the opencv folder

now i still have the 0xc000007b messege when trying to use the executeable and the dependecny walker says the following:

Error: At least one module has an unresolved import due to a missing export function in an implicitly dependent module. Error: Modules with different CPU types were found.

and in the files list nothing that i can see where the problem is at (no red lines no nothin!)