Project 4: Dayu Li

README.md

@@ -3,11 +3,52 @@ CUDA Denoiser For CUDA Path Tracer
 
 **University of Pennsylvania, CIS 565: GPU Programming and Architecture, Project 4**
 
-* (TODO) YOUR NAME HERE
-* Tested on: (TODO) Windows 22, i7-2222 @ 2.22GHz 22GB, GTX 222 222MB (Moore 2222 Lab)
+* Dayu Li
+* Tested on: Windows 10, i7-10700K @ 3.80GHz 16GB, GTX 2070 8150MB (Personal laptop)  
 
-### (TODO: Your README)
+## Features
+* A pathtracing denoiser that uses geometry buffers (G-buffers) based on A-trous wavelet filter
 
-*DO NOT* leave the README to the last minute! It is a crucial part of the
-project, and we will not be able to grade you without a good README.
+## Effects
+* Tested with 8 iterations and color-phi = 0.45, normal phi = 0.35, postion phi = 0.2.  
 
+| Raw | Denoised |
+| :----:  | :----: |
+|![](./img/1.png)|![](./img/2.png)|
+
+### Performance Analysis
+Since the A-Trous filter is applied only when the iterations are completed, the denoiser's performance is based on the image for the last frame thus has nothing todo with the iteration times. When the image size is 800 * 800, the time cost of applying a denoiser with 5 filter layers is about 5.88 ms.  
+
+#### Number of Levels of the Filter 
+Improving the filter layers will definitely cause a incrase of computation time. However, when the layer is greater than 5, imprving the number of layers will NOT change the effect of denoising apparently. Thus the filter layer number 4 or 5 is considered a proper value. The cost of time is linearly increasing with the number of layers which makes sense since the layers will affect the iteration times for a single for loop.  
+
+Effects and time with differnt filter layers (phi values are 0.45,0.35,0.2).  
+
+| Filter Layers |Time | Effect |
+| :----:  | :----: | :----:|
+| 1 | 2.14ms |![](./img/layer1.png)|
+| 3 | 4.65ms |![](./img/layer3.png)|
+| 5 | 5.37ms |![](./img/layer5.png)|
+| 10 | 11.66ms |![](./img/layer10.png)|
+
+### Change the phi values
+Improving the phi values given in the A-Trous paper will lead to different weight values when the denoiser is applied, thus lead to a total different output image, however the change of the phi values will not change the time coplexsity of the denoiser thus makes no change in the time costs.  
+
+* Tested with 8 iterations, changing the specified phi value to 3.0
+
+| Status |Effect |
+| :----:  | :----:|
+| Large Color | ![](./img/color.png)|
+| Large Normal | ![](./img/normal.png)|
+| Large Postion | ![](./img/pos.png)|
+
+### Change the Image size 
+Change the size of image will change the pixel numbers and thus lead to an increase of executing time.  
+
+* Tested with 10 iteartions with 5 filter layers  
+
+|Image Size| Time |
+|---|---|
+| 800 * 800 | 5.37ms|
+| 1600 * 1600 | 26.35ms|
+| 3200 * 3200 | 53.37ms|