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Questions tagged [image-enhancement]

71 questions
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1 answer

Contrast Limited Adaptive Histogram Equalization in 360 images

I am currently applying the Contrast Limited Adaptive Histogram Equalization algorithm together with an algorithm to perform the photo denoise. My problem is that I am working with 360 photos. As the contrast generates different values ​​at the…
João Santos
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Gabor filter parametrs for fingerprint image enhancement?

i am biggner in image processing and in gabor filter and i want to use this filter to enhance fingerprint image i read many articles about fingerprint image enhancement and i know that the steps for that is read image -> noramalize -> get…
Salo7ty
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Non-Reference Loss Function

I was going through this awesome research paper and I have found the term Non-Reference Loss Functions. Can someone help me to understand what it is? Some resource link is more than enough, I have googled this and I have found no clue. What is this…
R0b1n
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Enhancing corner detection of lamp with OpenCV

I'm using the following code to detect the brightly illuminated lamp. The illumination might vary. I'm using the following code to detect the same. img = cv2.imread("input_img.jpg") rgb = img.copy() img_grey = cv2.cvtColor(img,…
user6038900
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6 answers

uneven illuminated images

How to get rid of uneven illumination from images, that contain text data, usually printed but may be handwritten? It can have some spots of lights because the light reflected while making picture. I've seen the Halcon program's segment_characters…
maximus
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Easy way to correct Colour Constancy using Color by Correlation algorithm

Recently, I've been implementing a variety of algorithms whilst attempting to learn Matlab. One paper I've been reading is: Color by Correlation, which is cited by the thousands and used for comparison within many other color constancy…
Reanimation
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Retinex algorithm implementation

I need to implement Single Scale retinex and multiscale retinex algorithm in C#, I searched a bit but couldn't find any useful practice projects and artilces with code As I understood correctly I should: Convert RGB to YUV Blur the image using…
Aydar Omurbekov
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Robust color tracking vs exposure and white balance changes

Does anyone had the experience with color matching and frame-to-frame tracking of it video when the exposure settings and white balance are constantly changing? I'm working on color tracking app that uses iPad 2 frontal camera to capture video. I…
BloodAxe
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circular image with vertical periodic noise restoration by FFT

I have a circular image with vertical periodic noise, when I tried to use FFT and a vertical hard mask to eliminate these vertical lines,the circular shape border affects the result greatly. Is there a way to deal with the border or restrict the fft…
Kevin
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Detect dots in a image using image processing with python

I need to identify the following dots in the given images. But it doesn't give correct detection. Can someone give a methodology to identify these dots in an image like this? I have done some enhancement to this as follows, enhanced image, by…
vidu
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weighted CDF formula always returns 1

I am reading this paper for enhancing image quality. my problem is that when I am calculating weighted CDF, I always get 1 as output. here is the sequence of formulas: which gamma is defined like this: which Cw is the weighted CDF: which I think…
hossein hayati
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Interpolation vs Average

I'm new of computer vision concepts and I'd like to know why, when we double the size of an image, we should use bilinear interpolation where pixels haven't values instead of average between nearest known values pixels.
M.Morris
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KeyError: "None of [Index(['file_path'], dtype='object')] are in the [columns]

I tried to run this file and it's giving me the following error while trying to call the function. I couldn't understand what is causing this error. I want to do some image enhancement so that my model can better understand them while training. Any…
Ankita Prasad
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Error: 'numpy.ndarray' object has no attribute 'mode'

I have looked this error here but the code was different , he used PIL.ImageOps So basically I got an error with this code: img1 = cv2.imread(r'C:\Users\Yael\Desktop\final project\Image processing\PC3\PC3_Glucose_1.tif', 0) enhancer =…
Yael Lifshitz
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How can I compensate illumination changes in iris images other than using Retinex theory?

I want to make an effective illumination compensation on iris images and I want this compensation to be based on color i.e. illumination compensation using color rather than texture. I corrected my images for various mechanical errors but I want a…
KronnorK
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