| In most applications of image processing data is collected and displayed in square pixels. Hexagonal pixels offer the advantage of greater rotational symmetry in addition to close packed structure without gaps and a more circular (isotropic) pixel. I compared the image quality of images using square pixels with that of images employing hexagonal pixels. The comparison was done using various images, each considering a different aspect of geometry (i.e., lines at different angles, curves, etc.). The square pixel images were constructed using the average of a square area of smaller square pixels. Hexagonal pixel images were constructed using two techniques. The first one was called the “two-template approach”, wherein two different templates were used to create a close packed hexagonal image from smaller square pixels. The second approach was called the “six-neighbor approach” which creates a rectangular template using the six neighbors of a hexagonal pixel. Euclidean distance, Resemblity, Entropy and MTF were the image quality measures used to compare the square pixel and hexagonal pixel images. (Abstract shortened by UMI.)... |
