Search found 22 matches

by life24
2016-10-19T11:40:19-07:00
Forum: Digital Image Processing
Topic: I need image database
Replies: 5
Views: 16666

Re: I need image database

Thank you,
But TID2008 distorted with noise,but i need image database with vary contrast level.
For example: suppose original image is clean image (and reference) and 10 image from reference image but with several level contrast or haze from reference image.
by life24
2016-10-19T11:09:33-07:00
Forum: Digital Image Processing
Topic: I need image database
Replies: 5
Views: 16666

I need image database

hello,
I need image database the same TID2008 but instead distorted with noise, distorted with light,contrast or added haze to image.
We have such a database?
Thanks
by life24
2016-06-27T06:55:51-07:00
Forum: Digital Image Processing
Topic: Scaling factor in two matrix
Replies: 10
Views: 17822

Re: Scaling factor in two matrix

It's a standard blending function. If you know three of the four variables (out, A, B, s) you can easily calculate the fourth, for example: A = (out - B*s) / (1-s) Thank you for your reply, yes, but when watermark image in the cover image(A and B) , we lost A and B in watermark image. We just s and...
by life24
2016-06-27T06:41:24-07:00
Forum: Digital Image Processing
Topic: Scaling factor in two matrix
Replies: 10
Views: 17822

Re: Scaling factor in two matrix

Thank you for your reply,
The below formula is your formula? or it's from other papers?
out = A*(1-s) + B*s

We have out intensity and watermark is fine.
Now with Scale(for example : 0.5 ) and out ,how we can extract A and B ?
by life24
2016-06-27T06:24:15-07:00
Forum: Digital Image Processing
Topic: Scaling factor in two matrix
Replies: 10
Views: 17822

Re: Scaling factor in two matrix

We have the below formula

Watermarked= A + (s*B).

If A and B between 0 and 255, for example we have:

S = 0.5 , A = 250 and B = 245


Watermarked = 250 + (0.5*245) = 372.5 !!!
But each pixel is 8-bit and should be between 0 <= intensity <= 255 .
by life24
2016-06-27T05:39:04-07:00
Forum: Digital Image Processing
Topic: Scaling factor in two matrix
Replies: 10
Views: 17822

Re: Scaling factor in two matrix

Emailed to the owner article and answered me, now could you give me more explain about it? Embedding a matrix into another one can do as matrix addition. Scaling factor is used for obtaining the invisibleness of the watermark. Pls find the below. Watermarked= A + (s*B). Here A &B are matrices of cov...
by life24
2016-06-24T23:22:49-07:00
Forum: Digital Image Processing
Topic: Scaling factor in two matrix
Replies: 10
Views: 17822

Re: Scaling factor in two matrix

Sure,
Reference article is here and we can read it free.
http://www.sciencedirect.com/science/ar ... 0915001945
by life24
2016-06-24T21:47:53-07:00
Forum: Digital Image Processing
Topic: Scaling factor in two matrix
Replies: 10
Views: 17822

Scaling factor in two matrix

Hello, I reading an article and i can't understand well about scaling factor. Could you give me definition and example about scaling factor? How can embed one matrix to other matrix with scaling factor? Thanks http://s6.uplod.ir/i/00791/5n2zdovoqtd9.png http://s6.uplod.ir/i/00792/k687xdweoztj.png
by life24
2016-06-20T09:51:49-07:00
Forum: Digital Image Processing
Topic: Detection quality of pizza
Replies: 4
Views: 13784

Re: Detection quality of pizza

Thank you for your reply,
I do not know about it.
No explanation was given in the question. just it:
what is your suggestion in image processing for detection quality for pizza?

I wrote we use segmentation .
by life24
2016-06-18T12:28:22-07:00
Forum: Digital Image Processing
Topic: Detection quality of pizza
Replies: 4
Views: 13784

Re: Detection quality of pizza

No,This question was in our final exam but interesting for me.
I wrote we use segmentation .
by life24
2016-06-18T06:09:31-07:00
Forum: Digital Image Processing
Topic: Detection quality of pizza
Replies: 4
Views: 13784

Detection quality of pizza

Hello,
Generally, what is your suggestion in image processing for detection quality for pizza?
I think segmentation is good :)
Thanks
by life24
2016-06-15T07:39:38-07:00
Forum: Digital Image Processing
Topic: Problem with HE
Replies: 2
Views: 12159

Problem with HE

Hello,
Why in pure 'HE' isn't good for images with cumulative in black or white region in histogram? Thanks
For example:
Image
by life24
2016-06-15T07:34:38-07:00
Forum: Digital Image Processing
Topic: Mean shift problem of traditional histogram equalization technique
Replies: 1
Views: 11010

Mean shift problem of traditional histogram equalization technique

Hello, Could you explain it? mean shift problem of traditional histogram equalization technique to some extent.
by life24
2016-06-14T04:30:13-07:00
Forum: Digital Image Processing
Topic: Two question about watermarking
Replies: 1
Views: 8429

Two question about watermarking

Hello,
--Why is the watermark embedded into image instead of just inserting it into the file header?
2- What is the drawback of inserting additional information into images?(in watermarking)
Thanks
by life24
2016-06-14T04:20:00-07:00
Forum: Digital Image Processing
Topic: HSV HSB HSL color space
Replies: 2
Views: 10142

HSV HSB HSL color space

Hello, These are the same color space? HSV HSB HSL ? Thanks