https://community.intel.com/t5/Intel-Integrated-Performance/Weird-problem-with-openCV-face-detection/m-p/876126#M9549 <P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;">I've been trying to use OpenCV for face detection (using <SPAN>haar classifiers</SPAN> cascades). I've found out that for some pictures a face is not recognized, but if you put the same image into another one the face will be detected. Moreover, If you resize the Image (I do it one pixel after another of the image's width) openCV sometimes find the image.</SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;"></SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;">I have tried to find out if there is anything common to all of these images (I have hundreds of jpeg images that has this problem) but could not find a clue. My guess is that it has something to do with the way OpenCV "walks over" the image but I don't really have any way to prove it.</SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;"></SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;">I am attaching two images for you to try one will be detected and the other will not</SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;"></SPAN></SPAN></P> Wed, 01 Oct 2008 14:52:22 GMT opeth 2008-10-01T14:52:22Z https://community.intel.com/t5/Intel-Integrated-Performance/Weird-problem-with-openCV-face-detection/m-p/876126#M9549 <P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;">I've been trying to use OpenCV for face detection (using <SPAN>haar classifiers</SPAN> cascades). I've found out that for some pictures a face is not recognized, but if you put the same image into another one the face will be detected. Moreover, If you resize the Image (I do it one pixel after another of the image's width) openCV sometimes find the image.</SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;"></SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;">I have tried to find out if there is anything common to all of these images (I have hundreds of jpeg images that has this problem) but could not find a clue. My guess is that it has something to do with the way OpenCV "walks over" the image but I don't really have any way to prove it.</SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;"></SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;">I am attaching two images for you to try one will be detected and the other will not</SPAN></SPAN></P><P class="MsoNormal" style="margin: 0in 0in 0pt; direction: ltr; unicode-bidi: embed; text-align: left;" dir="ltr"><SPAN style="font-family: Arial;"><SPAN style="font-size: small;"></SPAN></SPAN></P> Wed, 01 Oct 2008 14:52:22 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Weird-problem-with-openCV-face-detection/m-p/876126#M9549 opeth 2008-10-01T14:52:22Z https://community.intel.com/t5/Intel-Integrated-Performance/Weird-problem-with-openCV-face-detection/m-p/876127#M9550 <DIV style="margin:0px;">I do not see attached images, were you able to provide test images?</DIV> <DIV style="margin:0px;">I would also recommend you to try IPP JPEG samples, for example picnic application where we integrated IPP Face Detector into GUI image viewer to see if IPP have the same issue with your images.</DIV> <DIV style="margin:0px;">Regards,<BR /> Vladimir</DIV> <DIV style="margin:0px;"></DIV> <P></P> Thu, 23 Oct 2008 17:39:03 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Weird-problem-with-openCV-face-detection/m-p/876127#M9550 Vladimir_Dudnik 2008-10-23T17:39:03Z