Questions tagged [histogram]
The histogram tag has no usage guidance.
62
questions
3
votes
1answer
572 views
Histogram evaluation for image quality concerning illumination
I'm currently trying to develop an algorithm to control the camera characteristic of a camera (the camera characteristic can be controlled to adopt it to the different lightning situation which can ...
2
votes
1answer
168 views
Histogram operation for improving visual object tracking
I'm developping a people tracking with nearest neighbour data association technique and kalman filter for smoothing/predicting.
The tracker works quite good but sometimes it mismatch objects if they ...
3
votes
1answer
8k views
What is use of a gaussian filter over histogram?
I am working in the field of digital image processing and currently i am reading this paper and I have two questions about it....
After applying a gaussian filter to a histogram, will the pixel ...
3
votes
2answers
203 views
Optimal image histogram for Human eye
I need to visualize some data as gray-scale images after contrast enhancement. The processing algorithm must be built on few samples, and then it will be applied on unseen images (suppose, the [min, ...
2
votes
1answer
573 views
Histogram of signal with a time shift added
One of the problems in Proakis's signal processing book using Matlab asks to plot the histogram of
x3(n) = x1(n) + x1(n-1)
where ...
3
votes
1answer
3k views
Interpolation in Contrast Limited Adaptive Histogram Equalization
I have been trying to implement the CLAHE algorithm and came across this page which states step by step procedure for the algorithm.
I understand the initial steps to perform HE of tiles in the image....
2
votes
1answer
998 views
Lesser bins histogram looks more equalised than higher bins histogram after histogram equalisation?
I tried to do a histogram equalisation on an image, and then display its histogram. I realise that when I show the histogram with 10 bins, it looks more "equalised" than when I show the histogram with ...
2
votes
3answers
1k views
Why histogram equalization fail in enhance images for bimodal histogram?
I'm on histogram equalization process. I have quite well understood the math but i don't understand why an histogram on bimodal image fails in image enhancement and what techniques can be used in this ...
1
vote
0answers
880 views
Local histogram equalization
I want to learn computer vision and so I downloaded image processing slides from my university archive. I'm on histogram equalization. Learning about local histogram equalization points me out to this ...
3
votes
1answer
1k views
Relation between histogram equalization and 'Auto Levels'
I need to enhance an image using only global linear adjustment of intensity, i.e.:
$$I'=aI+b,\qquad a,b\in \mathbb{R}$$
where $I$ and $I'$ are input and output (enhanced) image.
I already know how ...
7
votes
1answer
2k views
importance of using histogram equalization
I'm reading opencv tutorials and I'm diving into histogram equalization. i have looked in wikipedia, there is a nice example that sums up exactly the problem:
original:
equalized:
but for getting ...
10
votes
1answer
7k views
Opencv calcHist and calcBackProject in plain english
i've started experimenting with c++ and opencv because of i want to learn image processing.
Now, my first exercise is to create a skin detector with calcHist and calcBackProject.
But i don't ...
