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1
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4answers
49 views

What is the difference between the terms color Intensity and color Saturation?

In Digital Image Processing, what is the difference between the intensity and the saturation of a color? How would you explain the difference to a newbie?
3
votes
0answers
51 views

How to replace color in an image without changing its texture/shades or brightness?

I want to replace color in an image from another color: For that sample image is below I want to replace color such that it becomes I know it can be easily done in Photoshop but I am looking ...
1
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2answers
52 views

Seeking segmentation methods for this light microscope image

Although I am not new to math or programming, I am a total newbie to image segmentation. I have the following light microscope image and I would like to segment it into cytoplasm (the magenta ...
0
votes
1answer
48 views

How do I calculate correlated color temperature correctly?

How can I calculate the color temperature(CCT) of the light source illuminating a given raw image correctly? The method I used is proposed by McCamy, and the algorithm was also described in the ...
0
votes
1answer
61 views

How to use the Walsh-Hadamard transform to filter 24 bit RGB color values in a localized spatial region?

After reading this Signal processing Stack Exchange article tonight, What is the Walsh-Hadamard Transform and what is it good for?, I became interested in applying the Walsh-Hadamard transform to ...
1
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4answers
115 views

Finding a signals complimentary sound / frequency

I know about complimentary colors and how to get them, since colors are basically frequency / wavelengths. Is it possible to find a signals complimentary, additive or subtractive frequencies in an ...
1
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2answers
88 views

Why is it easier to extract color in HSV model than in RGB?

I am following the open-cv tutorial and they claim that: In HSV, it is more easier to represent a color than RGB color-space. after which they convert the image from BGR color model to HSV, ...
2
votes
1answer
55 views

Old photographies coloring

There is already a succesful question How did they color old black and white movies? on this site. Very general and correspondingly in general answered. Let me please narrow it down to just the ...
0
votes
1answer
23 views

Getting composition of a mixture of colours

I wanted to validate a thought on blending of colours digitally. Imagine I have two colours, $C_1$ $(R_1,G_1,B_1)$ and $C_2$ $(R_2,G_2,B_2)$. Now, I create colour $C3$ as follows: $C_3 = \alpha C_1 + ...
1
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1answer
36 views

How to go about implementing a program to measure the “intensity”/“saturation” of a color in an image?

I have a task of developing an application to measure the intensity of a color in an image. I am researching about how to go about it. Intensity refers to the purity of a hue. Intensity is also ...
0
votes
1answer
48 views

Converting from RGB to Lab to reduce colors

In many papers I see the following: First we have to convert image from RGB to Lab color space to reduce colors then ...
1
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2answers
95 views

What is the best color space to work with for Hand detection: RGB, HSV, or YCrCb?

I'm working on hand gesture recognition using C#. I'm using OPENCV for skin detection but its performance is not optimal. So I decided to do some filtering based on color space, but I do not know what ...
0
votes
1answer
76 views

SSD for RGB images

To compare grayscale images, I'm using SSD like the difference between the two corresponding pixels and then choose the minimum. But when it comes to RGB images, how should it works ?
-1
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1answer
63 views

what is the difference between HSV and CIE-Lab color space? [closed]

when do we use HSV color space and when do we use CIE-Lab color space?
0
votes
1answer
348 views

Algorithm for color-balancing an image

I'm working on color-balancing images with as little input from the user of my app as possible, specifically to remove color casts caused by scanning aged paper. Photoshop's Auto Color action works ...
0
votes
0answers
11 views

Analysing reflectance data from a spectrophotometer

I'm not sure if this question is appropriate for this site. Please let me know if not. I have measured the reflectance of two leaves using a AvaSpec-USB2 Fiber Optic Spectrophotometer. One is a dark ...
0
votes
1answer
93 views

How to Linearise an Input Image before applying Color Correction?

I'm doing color correction on Raw images taken from Camera directly. I want to make my Camera reproduce same colors as my Target camera. Here are the steps I'm following: Take Target Color values ...
5
votes
2answers
188 views

What's the best technique to determine if the contents of two images are the same?

I need to run comparisons on the output of hundreds of frames of simple 3D-rendered characters. Perceptually, many of the frames are exact duplicates. Based on this, I assumed something like a ...
0
votes
1answer
79 views

Difference between ycbcr and ycbycr

I see in a paper mentioning ycbcr as well as ycbycr. I am wondering what is the difference between the two? In the figure, the first two lines show ycbycr but the two bottom lines show ycbycr?
1
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0answers
32 views

Good color distance metric for classifying color pairs

I have some two tone origami paper. This particular paper comes in six types, each with a different pair of colors. Here's an image that shows all six: Given a picture of one of these sheets, I ...
0
votes
1answer
192 views

Is a change in colorspace needed when comparing colors only evaluated by the computer?

I am confused about the need to change color space for color comparison. I have read about delta E, the Lab format, and I do understand that comparisons in the RGB color space will not seem ...
6
votes
1answer
172 views

The small red peak in the CIE standard observer

The human eye has 3 types of color cones: red, green and blue. Their spectral sensitivity peaks in short (S, 420–440 nm), middle (M, 530–540 nm), and long (L, 560–580 nm) wavelengths. See diagram ...
1
vote
1answer
92 views

What is the implementation of a low-, mid- or high tone dodge or burn in the GIMP?

In The GIMP, and also in photoshop, you have the DODGE/BURN tool to enhance colors in shaded or highlighted regions, which would otherwise be blackish or whiteish. I found empirically that this filter ...
1
vote
2answers
435 views

CIELAB Color Clustering

I am trying to understand if there is an inherent advantage to using CIELAB for color-based segmentation. I segmented the cytoplasm from the image above, where the left image below is from RGB ...
0
votes
0answers
420 views

How to make color balance of photoshop using opencv

I want to make the same thing programmatically like Color balance in Photoshop , like in below image if we have same bar ...
0
votes
2answers
41 views

Tracking using color

I am working on tracking an object in a video by using its color. what i did is that i have converted the color of a selected object into LAB color space since it is a uniform color space. and then in ...
1
vote
1answer
76 views

How to unify the color and brightness measure of two given camera?

I have two cameras, and I'm up to perform some matching stuff on videos captured by these two cameras since I'm a CV guy. The problem is the two cameras have very different performance in terms of ...
2
votes
3answers
1k views

Problem with HSV and RGB color model

I am a beginner in digital image processing, recently I read a paper on color image contrast enhancement, In that paper authors have implemented their method in HSV color model. In my work I have ...
2
votes
1answer
224 views

Colored noises: Stationary or non-stationary?

I know for sure that white noise is considered as a stationary sound, but is that true for the rest of them? http://en.wikipedia.org/wiki/Colors_of_noise Also, can we meet some of these sounds in ...
1
vote
2answers
157 views

What are some uses of the overall colour average of an image?

As I understand, the overall colour average can be obtained by summing the individual r, g, b values of all pixels within and image and dividing by the number of pixels to produce a new tri-vector. ...
3
votes
2answers
96 views

What is state of the art in multivariate 2D image display?

If I have a 2D scalar image, it's trivial to display it with MATLAB or matplotlib type tools with the pixel values mapped via a color map, and there is any amount of literature (one example, another ...
5
votes
1answer
113 views

Temperature invariant color space

I'd like to build a color difference metric that will be invariant to small changes in lighting conditions. In other words, I should be able to tell that a red shirt is not the same as a blue shirt, ...
5
votes
1answer
997 views

Coloring a waveform with spectral centroid or by other means

Update 8 Unhappy of having to upload tracks to the service and looking at the new release of RekordBox 3 I've decided to take another look for an offline approach and a finer resolution :D Sounds ...
11
votes
2answers
9k views

How do I calculate the color temperature of the light source illuminating an image?

How can I calculate the (black body equivalent) color temperature of the light source illuminating a given image? Below are screenshots of Adobe Lightroom manipulating color temperature and a shift in ...
1
vote
1answer
329 views

Is the mean of visible color in CIELab color space can be non visible color?

I am converting color from RGB to CIELab to train a GMM. When I get back the mean of clusters of the GMM I have sometimes negatives values in RGB space. I was wondering if the mean of only visible ...
1
vote
2answers
89 views

Object Tracing with Particular Color

I started working on a autonomous robot project in my spare time. Everything is finished except the image proccessing part. I want my robot to follow an object with particular properties. For the ...
3
votes
1answer
643 views

FFT of color images incorporated into an Object Recognition method?

Is there any instance where Fourier transforms of color images have been used in conjunction with other object recognition method? Any instance of usage of Fourier transforms in color images? I ...
2
votes
4answers
2k views

How to Generate False Color Palette

How to convert grayscale intensity input to something like the following image? It seems that no response (0, black) is converted to dark blue, then it goes through other colors to red. How are ...
0
votes
1answer
702 views

Converting Gamut3D from RGB colorspace to LAB colorspace

I have this code for Gamut3D in RGB, but I'm looking to convert it into LAB colorspace but I'm not really sure what changes I ...
8
votes
2answers
2k views

YV12 to RGB - What is wrong with my algorithm?

I am attempting to convert YV12 to RGB using the following fragment shader: ...