hsv

I have written the code for histogram and i want to use it for SVM traning. But the fundamental problem is that i don't understand how many minimum number of bins i should choose so that i can get widely varied distribution among bins for different colors (red,green,yellow,blue,orange). So, can somebody give me the link/post the image of Hue color wheel for openCV . I need something as shown below but the hue range in it is 0-360 and i need a color wheel used by opencv (i.e. 0-180 ) in opencv, the hsv image has to fit into 3 8-bit channels, (no problem for S and V [0..255]) . since H is in the

I have a problem detecting speed traffic signs with opencv 2.4 for Android. I do the following: "capture frame -> convert it to HSV -> extract red areas -> detect signs with ellipse detection" So far ellipse detection works perfect as long as picture is good quality. But as you see in pictures bellow, that red extraction does not work OK, because of poor quality of picture frames, by my opinion. Converting original image to HSV: Imgproc.cvtColor(this.source, this.source, Imgproc.COLOR_RGB2HSV, 3); Extracting red colors: Core.inRange(this.source, new Scalar(this.h,this.s,this.v), new Scalar(230

I'm trying to interpolate between two colours in HSV colour space to produce a smooth colour gradient. I'm using a linear interpolation, eg: h = (1 - p) * h1 + p * h2 s = (1 - p) * s1 + p * s2 v = (1 - p) * v1 + p * v2 (where p is the percentage, and h1, h2, s1, s2, v1, v2 are the hue, saturation and value components of the two colours) This produces a good result for s and v but not for h. As the hue component is an angle, the calculation needs to work out the shortest distance between h1 and h2 and then do the interpolation in the right direction (either clockwise or anti-clockwise). What

I am making a Color class as a part of a very basic graphics API in c++. So I decided to take a look at Microsoft's .NET framework and noticed that their Color class has functions for HSB. Then I started a research to determine whether I should provide HSB, HSL or HSV or ALL of them in my class. So, I have 3 questions on HSB, HSL, HSV: Is HSB same as HSL? If not, why isn't there an HSBL or even HSBLV? I find many different methods of calculating these values, can someone show me the FASTEST ones? JoseV Is HSB same as HSL? No, HSB is the same as HSV but HSL is different. All these are used as a

I am new to OpenCV4Android. Here is some code I wrote to detect blue colored blob in an image. Among the following images, image 1 was in my laptop. I run the application and the frame captured by the OpenCV camera is image 2. You can look at the code to see what the rest of the images are. (As you can see in the code, all the images are saved in the SD card.) I have the following questions: . Why hass the color of the light-blue blob turned out to be light-yellow in the rgba frame captured by the camera (shown in image 2). I created a boundingRect around the largest blue colored blob, but

I've found a method on the Internet to convert RGB values to HSV values. Unfortunately, when the values are R=G=B, I'm getting a NaN, because of the 0/0 operation. Do you know if there is an implemented method for this conversion in Java, or what do I have to do when I get the 0/0 division to get the right value of the HSV? Here comes my method, adapted from some code on the Internet: public static double[] RGBtoHSV(double r, double g, double b){ double h, s, v; double min, max, delta; min = Math.min(Math.min(r, g), b); max = Math.max(Math.max(r, g), b); // V v = max; delta = max - min; // S

I intend to find a distance metric between two colours in HSV space. Suppose that each colour element has 3 components: hue, saturation, and value. Hue is ranged between 0 to 360, saturation is ranged between 0 to 1, and value is ranged between 0 to 255. Also hue has a circular property, for example, 359 in hue is closer to 0 in hue value than 10 in hue. Can anyone provide a good metric to calculate the distance between 2 colour element in HSV space here? First a short warning: Computing the distance of colors does not make sense (in most cases). Without considering the results of 50 years of

I figured I should post this question, even if I have already found a solution, as a Java implementation was not readily available when I searched for it. Using HSV instead of RGB allows the generation of colors with the same saturation and brightness (something I wanted). Google App Engine does not allow use of java.awt.Color, so doing the following to convert between HSV and RGB is not an option: Color c = Color.getHSBColor(hue, saturation, value); String rgb = Integer.toHexString(c.getRGB()); Edit: I moved my answer as described in the comment by Nick Johnson. Ex animo, - Alexander. I don't

I need to pass from RGB color space to HSV .. I searched in internet and found two different implementations, but those give me different results: A: precision mediump float; vec3 rgb2hsv(float r, float g, float b) { float h = 0.0; float s = 0.0; float v = 0.0; float min = min( min(r, g), b ); float max = max( max(r, g), b ); v = max; // v float delta = max - min; if( max != 0.0 ) s = delta / max; // s else { // r = g = b = 0 // s = 0, v is undefined s = 0.0; h = -1.0; return vec3(h, s, v); } if( r == max ) h = ( g - b ) / delta; // between yellow & magenta else if( g == max ) h = 2.0 + ( b -