Friday, November 9, 2012

Image Processing/ Vertex Shading

Video


Pat1
Original picture:





Fetures implemeted:
  •  Image negative: vec3(1.0) - rgb

  •  Gaussian blur: GaussianBlurMatrix = 1/16[[1 2 1][2 4 2][1 2 1]]

  •  Grayscale: vec3 w = vec3(0.2125, 0.7154, 0.0721); luminace = dot(rgb, W);

  •  Edge Detection: Sobel-horizontal = [[-1 -2 -1][0 0 0 ][1 2 1]]; Sobel-vertical = [[-1 0 1][-2 0 2 ][-1 0 1]].

  • Toon shading


Optional features:
  • Pixelate: define the pixel size(by using the picture size); Get the new coordinates by6 multiply the pixel size with the pixel index. Pixel indices are calculated by dived the original texture coordinates by pixel size.

  • Brightness: u = (rgb.r + rgb.g + rgb.b)/3;

  • Contrast: (m-a)/(n-a) vs m/n

  • Night Vision: Only multiplied by green color;



Part2:
Sea wave:
float s = sin(pos.x*2PI + time);
        float t = cos(pos.y*2PI + time);
        height = sin(sqrt(s^2 + t^2 ))/sqrt(s^2 +t^2 );



1 comment:

  1. hi..Im student from Informatics engineering, this article is very informative, thanks for sharing :)

    ReplyDelete