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Fix blur not drawing in shape for motion tracker #1275

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Fix blur not drawing in shape for motion tracker #1275

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fa62874
changed in place blurring to buffer
doruphin Jul 30, 2026
d452d45
unnecessary copy and change constant to enum
doruphin Jul 31, 2026
72bf9d8
change existing value to enum
doruphin Jul 31, 2026
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39 changes: 30 additions & 9 deletions src/modules/opencv/filter_opencv_tracker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -468,36 +468,37 @@ static int filter_get_image(mlt_frame frame,
}

if (blur > 0 && data->boundingBox.width > 1 && data->boundingBox.height > 1) {
cv::Mat roi = cvFrame(data->boundingBox);
cv::Mat blurredRoi;
roi.copyTo(blurredRoi);
bool do_blur = true;
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switch (mlt_properties_get_int(filter_properties, "blur_type")) {
case 1:
// Gaussian Blur
cv::GaussianBlur(cvFrame(data->boundingBox),
cvFrame(data->boundingBox),
cv::Size(0, 0),
blur);
cv::GaussianBlur(roi, blurredRoi, cv::Size(0, 0), blur);
break;
case 2:
// Pixelate
{
cv::Mat roi = cvFrame(data->boundingBox);
cv::Mat res;
cv::resize(roi,
res,
cv::Size(MAX(2, data->boundingBox.width / blur),
MAX(2, data->boundingBox.height / blur)),
cv::INTER_NEAREST);
cv::resize(res,
roi,
blurredRoi,
cv::Size(data->boundingBox.width, data->boundingBox.height),
0,
0,
cv::INTER_NEAREST);
cvFrame(data->boundingBox) = roi;
}
break;
case 3:
// Opaque fill, handled in shape_width option
shape_width = -1;
do_blur = false;
break;
case 0:
// Median Blur
Expand All @@ -506,12 +507,32 @@ static int filter_get_image(mlt_frame frame,
// median blur param must be odd and, minimum 3
++blur;
}
cv::medianBlur(cvFrame(data->boundingBox), cvFrame(data->boundingBox), blur);
cv::medianBlur(roi, blurredRoi, blur);
break;
default:
// Do nothing
do_blur = false;
break;
}

if (do_blur) {
switch (mlt_properties_get_int(filter_properties, "shape")) {
case 1:
// Ellipse
{
cv::Mat mask = cv::Mat::zeros(roi.size(), CV_8UC1);
cv::RotatedRect bounding = cv::RotatedRect(cv::Point2f(data->boundingBox.width / 2.0f,
data->boundingBox.height / 2.0f),
cv::Size2f(data->boundingBox.width, data->boundingBox.height),
0);
cv::ellipse(mask, bounding, cv::Scalar(255), -1, 1);
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blurredRoi.copyTo(roi, mask);
}
break;
default:
blurredRoi.copyTo(roi);
break;
}
}
}

// Paint overlay shape
Expand Down