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Merge pull request #27582 from MaximSmolskiy:take_into_account_overflow_for_connected_components
Take into account overflow for connected components #27582 ### Pull Request Readiness Checklist Fix #27568 The problem was caused by a label type overflow (`debug_example.npy` contains `92103` labels, that doesn't fit in the `CV_16U` (`unsigned short`) type). If pass `CV_32S` instead of `CV_16U` as `ltype` - everything will be calculated successfully Added overflow detection to throw exception with a clear error message instead of strange segfault/assertion error See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake
This commit is contained in:
Maxim Smolskiy
GitHub
parent
07cf36cbb0
commit
615ceefd0c
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@ -261,13 +261,24 @@ namespace cv{
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template<typename LabelT>
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inline static
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void flattenL(LabelT *P, const int start, const int nElem, LabelT& k){
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void checkLabelTypeOverflowBeforeIncrement(const LabelT numLabels) {
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constexpr LabelT maxLabelTypeValue = std::numeric_limits<LabelT>::max();
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CV_CheckLT(
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numLabels,
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maxLabelTypeValue,
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"Total number of labels overflowed label type. Try using CV_32S instead of CV_16U as ltype");
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}
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template<typename LabelT>
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inline static
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void flattenLParallel(LabelT *P, const int start, const int nElem, LabelT& k){
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for (int i = start; i < start + nElem; ++i){
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if (P[i] < i){//node that point to root
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P[i] = P[P[i]];
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}
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else{ //for root node
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P[i] = k;
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checkLabelTypeOverflowBeforeIncrement(k);
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k = k + 1;
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}
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}
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@ -353,6 +364,7 @@ namespace cv{
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// Action 2: New label (the block has foreground pixels and is not connected to anything else)
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#define ACTION_2 img_labels_row[c] = label; \
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P_[label] = label; \
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checkLabelTypeOverflowBeforeIncrement(label); \
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label = label + 1;
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//Action 3: Assign label of block P
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#define ACTION_3 img_labels_row[c] = img_labels_row_prev_prev[c - 2];
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@ -1160,7 +1172,7 @@ namespace cv{
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LabelT nLabels = 1;
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for (int i = 0; i < h; i = chunksSizeAndLabels[i]) {
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CV_DbgAssert(i + 1 < chunksSizeAndLabelsSize);
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flattenL(P.data(), stripeFirstLabel8Connectivity<LabelT>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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flattenLParallel(P.data(), stripeFirstLabel8Connectivity<LabelT>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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}
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//Array for statistics data
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@ -1261,6 +1273,7 @@ namespace cv{
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// Action 2: New label (the block has foreground pixels and is not connected to anything else)
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#define ACTION_2 img_labels_row[c] = lunique; \
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P[lunique] = lunique; \
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checkLabelTypeOverflowBeforeIncrement(lunique); \
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lunique = lunique + 1;
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//Action 3: Assign label of block P
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#define ACTION_3 img_labels_row[c] = img_labels_row_prev_prev[c - 2];
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@ -1789,7 +1802,7 @@ namespace cv{
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mergeLabels(imgLabels, P, chunksSizeAndLabels.data());
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for (int i = 0; i < h; i = chunksSizeAndLabels[i]) {
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flattenL(P, stripeFirstLabel4Connectivity<int>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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flattenLParallel(P, stripeFirstLabel4Connectivity<int>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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}
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//Array for statistics dataof threads
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@ -1854,6 +1867,7 @@ namespace cv{
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#define ACTION_1 img_labels_row[c] = 0;
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#define ACTION_2 img_labels_row[c] = lunique; \
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P[lunique] = lunique; \
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checkLabelTypeOverflowBeforeIncrement(lunique); \
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lunique = lunique + 1; // new label
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#define ACTION_3 img_labels_row[c] = img_labels_row_prev[c]; // x <- q
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#define ACTION_4 img_labels_row[c] = img_labels_row[c - 1]; // x <- s
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@ -2052,6 +2066,7 @@ namespace cv{
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//new label
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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}
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}
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@ -2135,6 +2150,7 @@ namespace cv{
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//new label
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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}
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}
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@ -2320,7 +2336,7 @@ namespace cv{
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mergeLabels8Connectivity(imgLabels, P, chunksSizeAndLabels.data());
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for (int i = 0; i < h; i = chunksSizeAndLabels[i]){
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flattenL(P, stripeFirstLabel8Connectivity<int>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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flattenLParallel(P, stripeFirstLabel8Connectivity<int>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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}
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}
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else{
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@ -2331,7 +2347,7 @@ namespace cv{
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mergeLabels4Connectivity(imgLabels, P, chunksSizeAndLabels.data());
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for (int i = 0; i < h; i = chunksSizeAndLabels[i]){
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flattenL(P, stripeFirstLabel4Connectivity<int>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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flattenLParallel(P, stripeFirstLabel4Connectivity<int>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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}
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}
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@ -2433,6 +2449,7 @@ namespace cv{
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//new label
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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}
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}
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@ -2483,6 +2500,7 @@ namespace cv{
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//new label
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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}
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}
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@ -3108,6 +3126,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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continue;
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}
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@ -3130,6 +3149,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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continue;
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}
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@ -3483,6 +3503,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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continue;
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}
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@ -3507,6 +3528,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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continue;
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}
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@ -3550,6 +3572,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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continue;
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}
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@ -3561,6 +3584,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = label;
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P_[label] = label;
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checkLabelTypeOverflowBeforeIncrement(label);
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label = label + 1;
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continue;
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}
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@ -4260,7 +4284,7 @@ namespace cv{
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LabelT nLabels = 1;
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for (int i = 0; i < h; i = chunksSizeAndLabels[i]){
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CV_DbgAssert(i + 1 < chunksSizeAndLabelsSize);
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flattenL(P.data(), stripeFirstLabel8Connectivity<LabelT>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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flattenLParallel(P.data(), stripeFirstLabel8Connectivity<LabelT>(i, w), chunksSizeAndLabels[i + 1], nLabels);
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}
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//Array for statistics data
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@ -4865,6 +4889,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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continue;
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}
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@ -4887,6 +4912,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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continue;
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}
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@ -5240,6 +5266,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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continue;
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}
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@ -5264,6 +5291,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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continue;
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}
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@ -5307,6 +5335,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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continue;
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}
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@ -5318,6 +5347,7 @@ namespace cv{
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//Action_2: New label (the block has foreground pixels and is not connected to anything else)
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imgLabels_row[c] = lunique;
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P[lunique] = lunique;
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checkLabelTypeOverflowBeforeIncrement(lunique);
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lunique = lunique + 1;
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continue;
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}
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@ -798,7 +798,47 @@ TEST(Imgproc_ConnectedComponents, 4conn_regression_21366)
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}
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}
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TEST(Imgproc_ConnectedComponents, regression_27568)
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{
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Mat image = Mat::zeros(Size(512, 512), CV_8UC1);
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for (int row = 0; row < image.rows; row += 2)
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{
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for (int col = 0; col < image.cols; col += 2)
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{
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image.at<uint8_t>(row, col) = 1;
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}
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}
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for (const int connectivity : {4, 8})
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{
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for (const int ccltype : {CCL_DEFAULT, CCL_WU, CCL_GRANA, CCL_BOLELLI, CCL_SAUF, CCL_BBDT, CCL_SPAGHETTI})
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{
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{
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Mat labels, stats, centroids;
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try
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{
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connectedComponentsWithStats(
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image, labels, stats, centroids, connectivity, CV_16U, ccltype);
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ADD_FAILURE();
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}
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catch (const Exception& exception)
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{
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EXPECT_TRUE(
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strstr(
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exception.what(),
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"Total number of labels overflowed label type. Try using CV_32S instead of CV_16U as ltype"));
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}
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}
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{
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Mat labels, stats, centroids;
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EXPECT_NO_THROW(
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connectedComponentsWithStats(
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image, labels, stats, centroids, connectivity, CV_32S, ccltype));
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}
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}
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}
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}
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}
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} // namespace
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