Contents

1. Histogram introduction

OpenCV Lecture - 6_1.Histogram(1/6) : Histogram Introduction

Source code

• http://study.marearts.com/2013/09/opencv-make-histogram-and-draw-example.html
• http://study.marearts.com/2014/11/opencv-emdearth-mover-distance-example.html
• http://study.marearts.com/2014/05/open-cv-get-histogram-and-compare-color.html

💡 bin, hog, bow

2. Histogram generating & drawing

OpenCV Lecture - 6_1.Histogram(2/6) : Histogram make & draw

Source code

• C++ histogram: http://study.marearts.com/2017/12/gray-image-histogram-without-opencv.html
• OpenCV Histogram: http://study.marearts.com/2017/12/calhist-for-gray-image-opencv-histogram.html
• Histogram draw: http://study.marearts.com/2013/09/opencv-make-histogram-and-draw-example.html
• RGB Histogram: http://study.marearts.com/2017/12/calchist-for-rgb-image-opencv-histogram.html

Reference

• https://docs.opencv.org/2.4/modules/imgproc/doc/histograms.html
• https://docs.opencv.org/2.4/doc/tutorials/imgproc/histograms/histogram_calculation/histogram_calculation.html

💡 calcHist, normalize, gray histogram, rgb histogram

3. Hue(hsv) histogram

OpenCV Lecture - 6_1.Histogram(3/6) Hue(HSV) Histogram

Source code

• Image: http://study.marearts.com/2017/12/hue-histogram-example-opencv-source-code.html
• Webcam version: http://study.marearts.com/2017/10/webcam-histogram-test-opencv.html

Reference

• https://en.wikipedia.org/wiki/RGB_color_space
• https://en.wikipedia.org/wiki/HSL_and_HSV

💡 cvConvert, hsv, hue, saturation, value, hsi

4. 2D histogram

OpenCV Lecture - 6_1.Histogram(4/6) 2D Histogram

Source code

• http://study.marearts.com/2014/11/opencv-randn-example.html

💡 minMaxLoc, 2d histogram

5. Stretching

OpenCV Lecture - 6_1.Histogram(5/6) Histogram Stretching

Source code

• http://study.marearts.com/2017/12/opencv-histogram-stretching-example.html

💡 stretching, normalize

6. Equalization

OpenCV Lecture - 6_1.Histogram(6/6) : Histogram equalization

Source code

• http://study.marearts.com/2018/01/histogram-equalization-stretching.html

💡 equalizeHist

🙇🏻Thank you!

🎁 Source code, Material(pdf) and example images 👇

https://www.marearts.com/products/opencv-lecture-materials-1