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How to apply Gabor wavelets to an image?
A typical use of Gabor filters is to calculate filter responses at each of several orientations, e.g. for edge detection. You can convolve a filter with an image using the Convolution Theorem, by taking the inverse Fourier transform of the element-wise product of the Fourier transforms of the image and the filter. Here is the … Read more
Non-linear axes for imshow in matplotlib
In my view, it is better to use pcolor and regular (non-converted) x and y values. pcolor gives you more flexibility and regular x and y axis are less confusing. import pylab as plt import numpy as np from matplotlib.colors import LogNorm from matplotlib.ticker import LogFormatterMathtext x=np.logspace(1, 3, 6) y=np.logspace(0, 2,3) X,Y=np.meshgrid(x,y) z = np.logspace(np.log10(10), … Read more
Loading image src using a variable containing base64 data in AngularJS
The content of the ng-src needs to be interpolated: Try this: <img data-ng-src=”https://stackoverflow.com/questions/22018776/{{image.dataURL}}”/>
How to convert an Image to UIImage?
There is no direct way of converting an Image to UIImage. instead, you should treat the Image as a View, and try to convert that View to a UIImage. Image conforms to View, so we already have the View we need. now we just need to convert that View to a UIImage. We need 2 … Read more
Is it OK to HTTP redirect images?
Yes, you can redirect images and browsers will follow redirects. But you’ll generally want to keep redirection to a minimum for performance reasons, because each redirect requires a separate HTTP request, which adds server overhead and increases end-user page load time a little. The one thing you should definitely avoid is redirecting many images on … Read more
Algorithm challenge: Generate color scheme from an image
To find the primary X colors, screencap the app. Run a color histogram on the image. The top X colors in the histogram are the theme. Edit: if gradients are used, you’ll want to pick distinct “peaks” of colors; that is, you may have a whole bunch of colors right around “orange” if orange is … Read more
What is the difference between “JPG” / “JPEG” / “PNG” / “BMP” / “GIF” / “TIFF” Image?
Yes. They are different file formats (and their file extensions). Wikipedia entries for each of the formats will give you quite a bit of information: JPEG (or JPG, for the file extension; Joint Photographic Experts Group) PNG (Portable Network Graphics) BMP (Bitmap) GIF (Graphics Interchange Format) TIFF (or TIF, for the file extension; Tagged Image … Read more
How can I set a website image that will show as preview on Facebook?
1. Include the Open Graph XML namespace extension to your HTML declaration <html xmlns=”http://www.w3.org/1999/xhtml” xmlns:fb=”http://ogp.me/ns/fb#”> 2. Inside your <head></head> use the following meta tag to define the image you want to use <meta property=”og:image” content=”fully_qualified_image_url_here” /> Read more about open graph protocol here. After doing the above, use the Facebook “Object Debugger” if the image … Read more