Abstract
This chapter describes Core Image, an image processing and analysis framework for iOS and macOS, and discusses how to use Core Image to implement image filtering and face detection.
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Notes
- 1.
In this example, the filter is CISepiaTone, which maps the colors of an image to various shades of brown.
- 2.
The official Core Image Filter Reference [5] lists the filters currently available, their characteristics and parameters, and shows a sample image produced by each filter.
- 3.
The functionality for discovering which filters are available is not limited to built-in filters; it can be used for any category, such as kCICategoryVideo (which means the filter can be used for video) or kCICategoryBlur (which includes all blurring filters).
- 4.
In fact, Core Image can even reorganize filters when applying them in a different order will produce the same result more efficiently [8]
- 5.
See [12] for another example, if interested.
- 6.
For a complete list of compositing filters, you can query the CICategoryCompositeOperation category.
- 7.
For a list of generator filters, you can query the CICategoryGenerator and CICategoryGradient categories.
- 8.
For the complete list of transition filters, you can query the CICategoryTransition category.
- 9.
Face detection should not be confused with face recognition. Core Image does not contain any built-in method for face recognition.
- 10.
- 11.
References
Auto Enhancing Images. https://apple.co/2VdbyDD. Accessed: 2020-06-23.
CIDetector Class Reference. https://apple.co/3hT2TzH. Accessed: 2020-06-23.
CIFilter Class Reference. https://apple.co/2YoPHLq. Accessed: 2020-06-23.
Core Image and Video. https://bit.ly/2Nofmxm. Accessed: 2020-06-23.
Core Image Filter Reference. https://apple.co/3fO0LaM. Accessed: 2020-06-23.
Core Image Kernel Language Reference. https://apple.co/2VbrWnV. Accessed: 2020-06-23.
Core Image Programming Guide. https://apple.co/37hvKZT. Accessed: 2020-06-09.
Core Image Programming Guide—Processing Images. https://apple.co/37UFqJX. Accessed: 2020-06-23.
Core Image Reference Collection. https://apple.co/30t8Xst. Accessed: 2020-06-10.
Core Image Tutorial: Getting Started. https://bit.ly/2Yq9aLv. Accessed: 2020-06-23.
Detecting Faces in an Image. https://apple.co/2BAXlti. Accessed: 2020-06-23.
Processing an Image Using Built-in Filters. https://apple.co/3doFqmN. Accessed: 2020-06-23.
Querying the System for Filters. https://apple.co/3hU99Y9. Accessed: 2020-06-23.
Subclassing CIFilter: Recipes for Custom Effects. https://apple.co/3i1JGw7. Accessed: 2020-06-23.
S. J. Gladman. Core Image for Swift: Advanced Image Processing for iOS. Reaction Diffusion Limited, 2016.
W. Moore. An Introduction to Core Image. https://bit.ly/2VebFii. Accessed: 2020-06-23.
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Marques, O. (2020). Core Image. In: Image Processing and Computer Vision in iOS. SpringerBriefs in Computer Science. Springer, Cham. https://doi.org/10.1007/978-3-030-54032-6_3
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DOI: https://doi.org/10.1007/978-3-030-54032-6_3
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