Implementing your OpenCV filters

Now that your development environment is ready, we can begin the fun part! We will implement three filters using OpenCV:

  • FilterOriginal: This filter does nothing and returns the same picture (lazy!)
  • FilterGrayscale: This filter converts a picture from color to grayscale
  • FilterBlur: This filter smoothes the picture

The parent class of all these filters is Filter. Here is this abstract class:

class Filter
 virtual ~Filter();

 virtual QImage process(const QImage& image) = 0;

Filter::Filter() {}
Filter::~Filter() {} 

As you can see, process() is a pure abstract method. All filters will implement a specific behavior with this function. Let's begin with the simple  ...

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