# \#haar

**URL:** https://forum.opencv.org/tag/haar/173.md

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## [About OpenCV Haar Cascades: Calculation and retrieval of x, y, w, h values for the bounding rectangle for face detection](https://forum.opencv.org/t/about-opencv-haar-cascades-calculation-and-retrieval-of-x-y-w-h-values-for-the-bounding-rectangle-for-face-detection/13818)

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**Author:** [@Jayce](https://forum.opencv.org/u/Jayce)\
**Replies:** 2\
**Last updated:** [July 11, 2023, 8:05am UTC](https://forum.opencv.org/t/about-opencv-haar-cascades-calculation-and-retrieval-of-x-y-w-h-values-for-the-bounding-rectangle-for-face-detection/13818 "2023-07-11T08:05:00Z")

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Good day! Does anyone here know how to pinpoint the exact code for calculating the Haar Cascades’ x, y, w, h rectangle values in the OpenCV library? I would just like to review the library codes myself and know how thes…

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## [Object Detection - Haar Cascade / LBP Cascade - Software - cv\_traincascade.exe - CPU Utilisation](https://forum.opencv.org/t/object-detection-haar-cascade-lbp-cascade-software-cv-traincascade-exe-cpu-utilisation/7353)

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**Author:** [@VDL](https://forum.opencv.org/u/VDL)\
**Replies:** 0\
**Last updated:** [January 30, 2022, 4:08pm UTC](https://forum.opencv.org/t/object-detection-haar-cascade-lbp-cascade-software-cv-traincascade-exe-cpu-utilisation/7353 "2022-01-30T16:08:24Z")

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The opencv\_traincascade.exe program that is used to train Haar/LBP cascade classifiers for object detection; I see that it only uses all available processors/cores for a small (in comparision to the rest) duration of ti…

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## [Object Detection - Haar Cascade / LBP Cascade - Simplest Example - Training Data](https://forum.opencv.org/t/object-detection-haar-cascade-lbp-cascade-simplest-example-training-data/7348)

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**Author:** [@VDL](https://forum.opencv.org/u/VDL)\
**Replies:** 1\
**Last updated:** [February 1, 2022, 2:10pm UTC](https://forum.opencv.org/t/object-detection-haar-cascade-lbp-cascade-simplest-example-training-data/7348 "2022-02-01T14:10:03Z")

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I would like to start using the Haar/LBP Cascade Classifier. I would like to start at the most basic level, with the most simplest example. You can compare it to what would be a ‘Hello World’ example in programming lang…