Questions tagged [histogram]

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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 ...

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