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Wiener in frequency domain.

Started by dmitry_vag in Image Signal Processing18 years ago 1 reply

Hi all. I am new in DSP, and have a misunderstanding related to Wiener filtration. I have both source and desired signals...

Hi all. I am new in DSP, and have a misunderstanding related to Wiener filtration. I have both source and desired signals (actually images) available. As I understand, when Wiener filter is calculated in spatial domain (straightforwardly or approximated using LMS) with predefined filter size, it is a FIR filter. But if it is calculated


wavelets

Started by rukmanimohan04 in Image Signal Processing18 years ago 1 reply

hi, I have a basic doubt regarding image analysis uaing wavelets. Is it correct to compare the details in one level...

hi, I have a basic doubt regarding image analysis uaing wavelets. Is it correct to compare the details in one level with the details of another level (ie., in terms of frequency).As we say details are hich frequency regions, can we say that a deta


Color histogram

Started by zary...@yahoo.com in Image Signal Processing19 years ago

Hello, I need help on creating a color histogram in Matlab. Now, I understand that for using the imhist(), it can only be used for grayscale...

Hello, I need help on creating a color histogram in Matlab. Now, I understand that for using the imhist(), it can only be used for grayscale or indexed images right? Thus we first need to convert it, say from RGB to index by using rgb2ind function. I've created color histogram, but I'm not sure on how to read it. Or rather, i'm not really sure if this is the correct color h


converting image to frequency domai using FFt

Started by subh...@yahoo.com in Image Signal Processing19 years ago 1 reply

hi Iam doing a project in image processing where i have to convert an image innto freuency domain.The problem is that all the fft programs...

hi Iam doing a project in image processing where i have to convert an image innto freuency domain.The problem is that all the fft programs take complex as input.Can some one tell me how to convert an image into complex format. Thanks Sam


Special Announcement: GSPx 2005

Started by Webmaster in Image Signal Processing19 years ago

GSPx is the major (digital and analog) signal processing technology forum and product exposition covering DSPs, mixed-signal and analog ...

GSPx is the major (digital and analog) signal processing technology forum and product exposition covering DSPs, mixed-signal and analog products, EDA tools, software and applications. This year's event will cover the latest technology in video compression, cellular, software defined radio (SDR), multi-core/multiprocessors, and much more. Keynote Speakers:


Re: Query in Image compression using jpeg 2000

Started by Juan de Dios Santander Vela in Image Signal Processing19 years ago 1 reply

El 16/06/2005, a las 10:06, eflame1979 escribi?: > It is normal get a file size smaller than the initial image after jp2 > compression....

El 16/06/2005, a las 10:06, eflame1979 escribi?: > It is normal get a file size smaller than the initial image after jp2 > compression. But using a commercial tool save the jp2 image as a the > format of the original image increases the final file size of the > image > to be greater than the original image. Is this normal? >


Re: Digest Number 131

Started by gaurav in Image Signal Processing19 years ago 3 replies

I have generated 2D hamming from 1d successfully in the past. Here is what i did suppose u have a one row of 32 element...

I have generated 2D hamming from 1d successfully in the past. Here is what i did suppose u have a one row of 32 element 1D hamming window. And now you want to generate a 2d window. So just copy the same elements to 32 rows to make a 32 x 32 matrix . Then take its transp


Quality of JPEG compression.

Started by rukmanimohan04 in Image Signal Processing19 years ago 1 reply

Hi, I want to know on what basis a Jpeg compressed image qualified? ie., How does the images are said to have 100%, 90% and so...

Hi, I want to know on what basis a Jpeg compressed image qualified? ie., How does the images are said to have 100%, 90% and so on... qualities??? Does it depend on the quantisation values?? waiting for reply, rukmani,


drift error in Motion Compensated Temporal Filtering (MCTF) structure used in Scalable Video Coding

Started by Lee I-Hsien in Image Signal Processing19 years ago

Hi all, Recently, I read some articles about MCTF structure which was used in the extension part of H.264/AVC standard. This...

Hi all, Recently, I read some articles about MCTF structure which was used in the extension part of H.264/AVC standard. This scalable codec use MCTF to achieve the temporal scalability and claim that this structure will not have the drift error like conventional hybrid


Image Processing application

Started by Puneeth in Image Signal Processing19 years ago 2 replies

Hello, i am developing an Image processing application which automates the process of extracting information from the...

Hello, i am developing an Image processing application which automates the process of extracting information from the given input image.Input will normally be a bulding plan(jpeg image) and the output should be the dimensions of each and every room stored in


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