This interactive allows you to see the pixels of an image, and details about those pixels. Click Zoom In to see details about individual pixels.
Find an edge in the graph and zoom right in. What information could a computer use from the values of the pixels surrounding the edge to find it?
We have supplied you with some grids to apply to the image to transorm it. The numbers in the grids are multiplied against the values of the pixels that surround each point. What numbers can you use in these boxes to discover edges?
Below the grids is a thresholder which you can apply to the result. What results can you get if you combine these two filters to the image? There is an option for outputting the absolute value of the result of the multiplication grid. What does checking and unchecking this box change about the result? What happens if you apply multiple grids?
Try adding a threshold to the picture once the transformation has taken place to highlight the edges you find.
This interactive works best on a desktop browser, due to the heavy performance load.
Either drag and drop an image onto this page, or click the button below to load your own image into the interactive. The image will be resized for performance.
You can save an image of this interactive by right clicking on the zoomed image and clicking "Save image as..." (Chrome/Firefox).