With IPP option on, Arithmetic exception happens in webcam_demo when switch to arbitrary oriented grouping.

[thorikawa]

Steps to reproduce:

1. Build opencv (as of August 18) with IPP option on and with contrib modules.
2. Build and run webcam_demo
3. Press 'g' to switch to arbitrary oriented grouping.
4. Exception happens.

Back Trace:

Program received signal EXC_ARITHMETIC, Arithmetic exception.
0x000000010026bca9 in cv::meanStdDev (_src=@0x7fff5fbf77a8, _mean=@0x7fff5fbf7788, _sdv=@0x7fff5fbf7768, _mask=@0x10084b628) at /Users/poly/workspace/opencv/modules/core/src/stat.cpp:1040
1040         int rows = src.size[0], cols = (int)(total_size/rows);
(gdb) bt
#0  0x000000010026bca9 in cv::meanStdDev (_src=@0x7fff5fbf77a8, _mean=@0x7fff5fbf7788, _sdv=@0x7fff5fbf7768, _mask=@0x10084b628) at /Users/poly/workspace/opencv/modules/core/src/stat.cpp:1040
#1  0x0000000101a29fd2 in cv::text::MaxMeaningfulClustering::probability (this=0x7fff5fbfb270, cluster=@0x1038ed008) at /Users/poly/workspace/opencv_contrib/modules/text/src/erfilter.cpp:2684
#2  0x0000000101a23072 in cv::text::MaxMeaningfulClustering::build_merge_info (this=0x7fff5fbfb270, Z=0x1037aa060, X=0x1038a2400, N=25, dim=7, use_full_merge_rule=false, merge_info=0x7fff5fbfadb0, meaningful_clusters=0x7fff5fbfb300) at /Users/poly/workspace/opencv_contrib/modules/text/src/erfilter.cpp:2366
#3  0x0000000101a20d2e in cv::text::MaxMeaningfulClustering::operator() (this=0x7fff5fbfb270, data=0x1038a2400, num=25, dim=7, method=0 '\0', metric=2 '\002', meaningful_clusters=0x7fff5fbfb300) at /Users/poly/workspace/opencv_contrib/modules/text/src/erfilter.cpp:2269
#4  0x0000000101a4b29c in cv::text::erGroupingGK (_image=@0x7fff5fbfcf40, _src=@0x7fff5fbfcf20, regions=@0x7fff5fbfd830, groups=@0x7fff5fbfcfd0, text_boxes=@0x7fff5fbfcfb8, filename=@0x7fff5fbfcf08, minProbability=0.5) at /Users/poly/workspace/opencv_contrib/modules/text/src/erfilter.cpp:3086
#5  0x0000000101a49db3 in cv::text::erGrouping (image=@0x7fff5fbfcf40, channels=@0x7fff5fbfcf20, regions=@0x7fff5fbfd830, groups=@0x7fff5fbfcfd0, groups_rects=@0x7fff5fbfcfb8, method=1, filename=@0x7fff5fbfcf08, minProbability=0.5) at /Users/poly/workspace/opencv_contrib/modules/text/src/erfilter.cpp:4084
#6  0x0000000100004a7d in main (argc=1, argv=0x7fff5fbff778) at webcam_demo.cpp:222
```'

[thorikawa]

Sent PR to opencv repo. opencv/opencv#3135

[thorikawa]

Fixed.