为什么SADWinowSize_slider的跟踪栏的值在分配给 sbm->state 时变为 0。SADWindowSize，在我的代码中

Why the value of trackbar of SADWinowSize_slider become 0 when it assign to sbm->state.SADWindowSize, in my code

本文关键字：state SADWindowSize 代码 我的 跟踪 slider SADWinowSize 为什么 sbm- 分配 gt      更新时间：2023-10-16

我正在使用opencv通过GUI测试立体BM调谐参数。

下面是我的代码。 

Mat out1, out2;
Size imageSize = out1.size();
StereoBM sbm;
/// Initialize values
int preFilterType_slider = 0, preFilterCap_slider = 0, preFilterSize_slider = 0,
minDisparity_slider = 0, uniqnessRatio_slider = 0, textureThreshold_slider = 0,
speckleRange_slider = 0, sADWindowSize_slider = 5, spackleWindowSize_slider = 0,
numDisparities_slider = 0, numDisparities2_slider = 0;

int preFilterType_max = 1, preFilterCap_max = 61, preFilterSize_max = 100,
minDisparity_max = 200, uniqnessRatio_max = 2500, textureThreshold_max = 10000,
speckleRange_max = 500, sADWindowSize_max = 255, spackleWindowSize_max = 200,
numDisparities_max = 500, numDisparities2_max = 0;

Mat dispt, disp8, g1, g2;
void on_trackbar_bmTunning(int , void*)
{
    if (preFilterSize_slider % 2 == 0) preFilterSize_slider++;  //odd
    if (preFilterSize_slider < 5) preFilterSize_slider = 5;     //started from 5
    if (preFilterSize_slider > 255) preFilterSize_slider = 255; // to 255
    if (preFilterCap_slider < 1) preFilterCap_slider = 1;
    if (preFilterCap_slider > 63) preFilterCap_slider = 63;
    if (sADWindowSize_slider % 2 == 0) sADWindowSize_slider++;
    if (sADWindowSize_slider <= 5) sADWindowSize_slider = 5;
    if (sADWindowSize_slider > 255)sADWindowSize_slider = 255;
    if (sADWindowSize_slider >= MIN(imageSize.width, imageSize.height))
        sADWindowSize_slider = MIN(imageSize.width, imageSize.height);
    if (minDisparity_slider < 0) minDisparity_slider = 0;
    if (numDisparities_slider <1) numDisparities_slider = 1;
    if (textureThreshold_slider < 0) textureThreshold_slider = 1;
    if (uniqnessRatio_slider < 0) uniqnessRatio_slider = 1;

    //disp8 = g1.clone();
    sbm.state->speckleWindowSize = spackleWindowSize_slider;
    sbm.state->speckleRange = speckleRange_slider;
    sbm.state->preFilterSize = preFilterSize_slider; // 41
    sbm.state->preFilterCap = preFilterCap_slider; //31
    sbm.state->SADWindowSize = sADWindowSize_slider; //41
    sbm.state->minDisparity = minDisparity_slider *-16;//-64
    sbm.state->numberOfDisparities = numDisparities_slider * 16; //128
    sbm.state->textureThreshold = textureThreshold_slider; //10
    sbm.state->uniquenessRatio = uniqnessRatio_slider; //15
    sbm(g1, g2, dispt);
    normalize(dispt, disp8, 0, 255, CV_MINMAX, CV_8U);
    imshow("Tune BM Window ", disp8);
}
int test2_bmTunning() {
    out1 = imread("aloeL.jpg");
    out2 = imread("aloeR.jpg");
    cvtColor(out1, g1, CV_BGR2GRAY);
    cvtColor(out2, g2, CV_BGR2GRAY);
    namedWindow("Tune BM Window", CV_WINDOW_NORMAL);
    createTrackbar("Number of Disparities", "Tune BM Window", &preFilterType_slider, preFilterType_max, 0);
    createTrackbar("Pre Filter Cap", "Tune BM Window", &preFilterCap_slider, preFilterCap_max, on_trackbar_bmTunning);
    createTrackbar("Pre Filter Size", "Tune BM Window", &preFilterSize_slider, preFilterSize_max, on_trackbar_bmTunning);
    createTrackbar("Minimum Disparity", "Tune BM Window", &minDisparity_slider, minDisparity_max, on_trackbar_bmTunning);
    createTrackbar("Uniqueness Ratio", "Tune BM Window", &uniqnessRatio_slider, uniqnessRatio_max, on_trackbar_bmTunning);
    createTrackbar("Texture Threshold", "Tune BM Window", &textureThreshold_slider, textureThreshold_max, on_trackbar_bmTunning);
    createTrackbar("Speckle Range", "Tune BM Window", &speckleRange_slider, speckleRange_max, on_trackbar_bmTunning);
    createTrackbar("Block Size", "Tune BM Window", &sADWindowSize_slider, sADWindowSize_max, on_trackbar_bmTunning);
    createTrackbar("Speckle Window Size", "Tune BM Window", &spackleWindowSize_slider, spackleWindowSize_max, on_trackbar_bmTunning);
    createTrackbar("Number of Disparity", "Tune BM Window", &numDisparities_slider, numDisparities_max, on_trackbar_bmTunning);
    /// Show some stuff
    //on_trackbar_bmTunning(sADWindowSize_slider, 0);
    waitKey(0);
    return 0;
}

问题：

当跟踪栏滑块中的 SADWindowSlize 值的值分配给 sbm.state->SADWindowSize = sADWindowSize_slider;//41

在这一行代码中，sADWindowSize_slider 的值变为 0，因此它会引发运行时错误，即 SAD 窗口大小应该是奇数，介于 5 到 255 之间。

我无法理解SADWindowSize_slider的值如何变为 0。

请指导我找到原因并帮助我解决问题。

谢谢

我们在代码中发现了问题。

SADWindowSize 应该是奇数，介于 5 ~ 255 之间。因此，这个条件是不需要的，也没有意义。 

if (sADWindowSize_slider >= MIN(imageSize.width, imageSize.height))
        sADWindowSize_slider = MIN(imageSize.width, imageSize.height);

只需删除上面提到的代码行，为您的 iamge 运行和调整参数并享受结果。

玩得愉快！！

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