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I am making a application that you can apply different effects to photos using GPU Image Framework by Brad Larson.I want to add X-ray Effect filter in GPU image app.Any pointers will be appreciated
You want something like the GPUImageColorInvertFilter:
If that doesn't produce the exact effect you want, you could create a custom filter based on it and have your fragment shader first convert to luminance, and then apply a greenish tint based on the inverse of the pixel's luminance. That would provide the exact effect you show above.
I'll leave the coding of such a shader as an exercise for the reader.
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I am new to Swift and Xcode. Currently I have imagepicker working on my app and I am trying to detect multiple objects in the image that is uploaded from the image library, but I cannot find any tutorials where it depicts still image object detection with bounding boxes from image picker.
I know that I need to start off with VNImageRequestHandler in SwiftUI, but from there how do you input your machine learning model and create the bounding boxes. I have already tried piecing the code together from the Still images tutorial on Apple developer and the Vision object detection on Apple Documentation.
Any tips or information would be extremely helpful!
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How does filter size affect image understanding?
For example, if our data is images of human faces, what is the difference between using a 3 * 3 filter and a 7 * 7 filter?
Does increasing the size of the filter differentiate more shapes and textures?
Yes, you are correct, to some extent.
Increasing the filter kernel allows the model to differentiate between more complex & bigger shapes and textures. For example:
Conv2D(filters=x, kernel_size=(7,7)) can differentiate more shapes than Conv2D(filters=x, kernel_size=(3,3)) can.
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I'm writing an ios app that can create a word cloud or word mosaic with a pattern selected by user. My question is, how can I calculate the coordinates of each word, considering the sizes of each word is randomly calculated? Or any other approach?
Note that the pattern I want to work on is like this
but, rather like that, my app will fill the white areas with word mosaic, while preserving the photo of the user.
[EDIT]
my algorithm right now is to randomly set the size and position of each words and just put them there. How can I check if each word that I'm putting doesn't intersect with each other and the photo?
Reference: http://www.imagechef.com/ic/word_mosaic/
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I have a task of building 2d game (packman style) and I need to use open gl(any version) for drawing image (task says so). It means I should build "open gl application" in Xcode, or it is enough to use Core Graphics or UIViews?
I had a very positive experience in my experiments at writing a 2D "packman-style" game using Core Graphics: if you do it right, CALayer animation proves sufficiently reliable and simple to implement.
Here is a link to a great article that explains how you can implement animated sprites in Cocoa. The trick is to use image atlases to avoid managing multiple images at runtime.
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I am new to Quartz, and I would like to draw a candlestick chart in iOS, but I don't know how.
How can I draw charts like this? Are there any good examples for iOS?
Core Plot may be able to do it. If not, it's probably a pretty easy thing to add to the Core Plot library.
http://code.google.com/p/core-plot/
You can do it with SwiftCharts, there are 2 candle sticks examples ready to use - one interactive and other not-interactive (with less overhead, in case you don't need interactivity)
(Disclosure: I'm the author)