I conn't resize an image, how to fix it?

C++
1

the source image has been shown, but can not to resize the image and exit the application.

image
image785×650 27.1 KB

2

please post code as text

3

There is my code

int imgWidth = 320;
int imgHeight = 240;
uint8_t *imgBuf = nullptr;
cv::Mat srcImg, dstImg;

uint8_t *buf = new uint8_t[imgWidth * imgHeight];
imgBuf = buf;
for (int i = 0; i < imgHeight; i++) {
    for (int j = 0; j < imgWidth; j++) {
        uint8_t data = rand() % 256;
        buf[i * imgWidth + j] = data;
    }
}

srcImg = cv::Mat(imgHeight, imgWidth, CV_8UC1, imgBuf);
cv::imshow("srcImg", srcImg);

if (!srcImg.empty()) {
    int newImgWidth = imgWidth * 2;
    int newImgHeight = imgHeight * 2;
    cv::resize(srcImg, dstImg, cv::Size(newImgWidth, newImgHeight), 0, 0, cv::INTER_NEAREST);
}

if (!dstImg.empty()) {
    cv::imshow("dstImg", dstImg);
    cv::waitKey(0);
}
4

you are mixing GUI toolkits: Qt and whatever opencv was built with.

that is dangerous and likely the cause of all issues you experience.

as long as there is any Qt involved, we can’t help.

5

I got it, this question come from the opencv configure problem in qt .pro file

6

There is no problem with win32ui check :

        cout << srcImg.rows << "," << srcImg.cols << "\n";
        cout << dstImg.rows << "," << dstImg.cols << "\n";

You can use rng::fill instead of rnd

7

Thank you for your help, I had fixed it.