Découvrez ou redécouvrez les expériences de Charles Forman, un voyage dans le monde des pixels et des éléments. Via Setpixel
>Quote : A digital image is made up of two dimensional array of different colors. These indivual colors that make up an image are called pixels. Normally, these colors are displayed tightly next to each other. When displayed in the right order, they made up what appears to be a picture. What if these pixels were displayed in a slightly different way? Perhaps each pixel could be represented as an icon representing that pixel rather than a simple dot on a screen.
Previously, these techniques were used very commonly due to the limitation of the display technology. For example, on text only terminal displays, pictures could be converted into text where each pixel of the image is represented by a letter that resembles the brightness of that pixel. Other examples would include LED display panels, or more artistic examples like Danny Rozin's Wooden Mirror.
It is interesting that these concepts are being explored not because of necessity but rather because of a particular visual aesthetic.
In this case, each pixel is represented by a circle. The size of the circle is varied based on the brightness of that particular pixel. So, if the pixel is very bright, the circle is very large. If the pixel is very dark, the circle is very small or invisible. This is very standard as far as these type of effect goes.
The slight difference with this demo is that the circles are colored only when something in the video moves. With each frame, the previous video frame is differenced with the current to get a picture of what has moved. When something has moved, or changed, that section of the buffer is painted. Over time, this buffer is faded. The result is some kind of trailing effect.
Based on this buffer, the color of the circle is affected. The section of video that is currently moving's circle is painted bright green. Over time, the color will fade.
Because the circles size is still based on the intensity of the pixel in the video, if there is much movement, it doesn't mean that the image will be very bright and green, rather that it will be more clear.
The aesthetic of the end result is reminisent of visualizations of old computer displays, or pixel-based toys like "lite-brite".