Note: a true write up would have included the values used to achive the results.

#### Assignment I Write up

29.Sept.2000
 I implemented the following features: Random noise: Brighten: Contrast: Saturation: Crop: Extract Channel: Quantize: Random dither Ordered dither Floyd-Steinberg dither Composite Create a composite image of myself and a famous place. I started with the scene of the city and myself. I created the masks by hand and them composited the images together. Blur Edge detect Scale Rotate Fun Point Sampling, Bilinear Sampling, 3x3 Gaussian Sampling. NPR: The goal of this filter is to approximate an etched image where the line width is inversely proportional to aveage luminance of the area it covers. The filter has three parameters: theta: this is the angle of the etching lines (in degrees) lw: this is the maximum width of a line in pixels. This also loosely represents    the amount of gray levels available (i.e quantization level) sw: this is the distance between lines in pixels The filter works by first rotating the image by theta degrees. Then the average luminace is computed for two 1x(lw/2) regions of the image this number is used to determine how many pixels to set to black = (lw/2)*(1-avg_lum/255). Thus the average luminance is kept approximately the same. The image is then rotated back, and then cropped. Note at this time the crop starting point is sliightly incorrect. I will fix this in a later version This algorithm need a high amount of highly correlated data to yield pleasing results. So it is advisable to use the sampling flag set to 1 or 2 and the scale flag set to a value proportional to the lw value. It may also be useful to blur the final result or scale it back down to it's original resolution it the image was to be displayed on screen For example the Einstein image was created with the folowing commands: image.exe -sampling 1 -scale 4 4 -NPR 30 16 2 < einstein.bmp > einstein_etch.bmp image.exe -sampling 1 -scale .5 .5 -blur 9 < einstein_etch.bmp > einstein_etch_small.bmp The Dobkin image was created with the following commands: image.exe -sampling 1 -NPR 30 16 2 < dobkin1.bmp > dob_etch2.bmpimage.exe -sampling 1 -scale .5 .5 -blur 9 < dob_etch2.bmp >dob_etch2_small.bmp ; Art Contest: Please enter my dobkin and einstein images into the art contest