HSV Color Wheel, by Shervin Emami ([email protected]), 6th Nov 2009. HSVFiltering part added by Gabor Vasarhelyi ([email protected]), since Jan 2011.

Current version: 1.1.1 Build 71

This code lets you select HSV colors and color ranges (radius around base color in HSV color space) for colored blob detection.

Code tested on linux and Windows.

• The code relies on OpenCv 2.x/3.x, you should install that first (yes, I know, it is old, I will upgrade only if you really need it). I tested it with versions 2.4.13 and 3.2.0 and both work fine.

• Using CUDA is also recommended for speedup.

On linux, run ./bootstrap.sh which creates build, in which you can make.

If you want to experiment with different OpenCV versions, change the explicitely given version in CMakeLists.txt in the line find_package( OpenCV ... REQUIRED ).

For Windows, code was only tested in Visual Studio. There you need to setup your environment properly. The file called user_macros.props might be of help.

An input image or video file is needed as a first argument.

Click on the top Hue map, or the bottom Color graph to change values.

• LEFT button: change values to 3x3 neighbor average color. Do not change range.

• Shift+LEFT button: Average colors. Do not change range.

• Ctrl+LEFT button: save current color and range and draw it on the palette.

• Ctrl+Shift+LEFT button: clear all saved colors+ranges.

• RIGHT button: include this pixel to new range as tight as possible.

• Shift+RIGHT button: undo last mouseclick or console color input

• Ctrl+RIGHT button: undo last mouseclick or console color input

• Ctrl+Shift+RIGHT button: reset inclusion of multiple colors

Note: these work only when the image window is the active one.

• nN - next frame
• fF - 100 frame forward
• h,s,v - start writing a number in the console, on Enter it will update color.H, .S, .V, respectively
• H,S,V - start writing a number in the console, on Enter it will update color.rangeH, .rangeS, .rangeV, respectively
• c,C - start writing three numbers in the console with space between, on Enter it will update all color.H, .S, .V
• r,R - start writing three numbers in the console with space between, on Enter it will update all color.rangeH, .rangeS, .rangeV
• d/D - draw red circles and show area/diameter around none/largest/all blobs
• x/X - change highlight color (blue, green, red, white)
• BackSpace - undo last color or range selection (of mouse clicks or console input)