# Tag Info

Accepted

### $8 \times 8$ block matrix in JPEG image compression?

The lossy JPEG compression does not merely remove small coefficients in higher frequencies. It encodes them with a precision relative to a (relatively crude) visual perception model; most notably, ...
• 29.6k
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### Auto Detection of Rotation Angle on Arbitrary Image with Orthogonal Features

If I understand your method 1 correctly, with it, if you used a circularly symmetrical region and did the rotation about the center of the region, you would eliminate the region's dependency on the ...
• 12.3k
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• 26.5k
Accepted

### Should Edge Detection Be Applied in Spatial or in Frequency Domain?

We need to separate the concept of edge detection from the tools we use to apply the procedure. Edges are local property of the image. Being so local means we don't analyze the image in frequency ...
• 39.1k
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• 29.6k
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### Are There Common Values of Standard Deviation for Gaussian Noise of an Image?

You can easily have a look on the values of the STD on Image Denoising Papers: The range of 1-15 is considered low. The range 15-30 is considered medium. The range 30-50 (Even above) is considered ...
• 39.1k

### Auto Detection of Rotation Angle on Arbitrary Image with Orthogonal Features

There is a similar DSP trick here, but I don't remember the details exactly. I read about it somewhere, some while ago. It has to do with figuring out fabric pattern matches regardless of the ...
• 6,875

### Auto Detection of Rotation Angle on Arbitrary Image with Orthogonal Features

This is a go at the first suggested extension of my previous answer. Ideal circularly symmetric band-limiting filters We construct an orthogonal bank of four filters bandlimited to inside a circle ...
• 12.3k

### Digital Image Processing Textbook with Specific Topics

This is the list I'd recommend: Rafael C. Gonzalez, Richard E. Woods - Digital Image Processing Great introductory book. Well written, a lot of examples. Though it is not deep in any of the fields. ...
• 39.1k
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### Localized Gamma Correction

Gamma Correction is Pixel Wise operation. Hence what you can do is estimate it per pixel and then average it per local area.
• 39.1k

### Recommended Order of Performing Denoising, Deblurring and Super Resolution on an Image

If your image is modeled as an image which is noisy, blurry and heavily decimated the optimal thing to do is estimate the image given that model. The model is well defined in @Laurent Duval's ...
• 39.1k
Accepted

### 2D Frequency Domain Convolution Using FFT (Convolution Theorem)

Similar to your question Applying 2D Image Convolution in Frequency Domain with Replicate Border Conditions in MATLAB the issue is what happens when you multiply in 2D in frequency domain. So few ...
• 39.1k
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### Is the Laplacian Filter an High Pass Filter (HPF)?

There are many approximations for the Laplacian Filter (See The Hypermedia Image Processing Reference - Laplacian/Laplacian of Gaussian): Indeed this is an High Pass Filter (HPF). Namely it will ...
• 39.1k
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### What is Label Refinement in the Context of Image Segmentation

The correct context of the refinement key word is segmentation. Label Refinement in the context of image segmentation is a step to increase the resolution and understanding of the segmentation. It can ...
• 39.1k