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| Undergraduate Honours Projects | ||||||
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Carleton University - School of Computer Science Undergraduate Honours Project Winter 2010 Real-Time HDR Processing Edward Duong 
ABSTRACT In the field of digital image processing, tone mapping is a technique for transforming high dynamic ranges in light intensity to a lower dynamic range while attempting to maintain as much of the original image details as possible. Unfortunately, most tone mapping processes are time consuming and computationally intensive. As a result, users can spend a significant amount of time adjusting tone mapping parameters and reapplying the process for a single image before achieving a desired output image. The goal of this report is to explain and provide a technique for achieving soft real-time visual feedback on two existing tone mapping processes - Fattal and Drago. Our technique involves creating a lower resolution copy of the original image through multi-scale image processing, applying the tone mapping process on this lower resolution copy, and then scaling the resulting image to its full resolution. This produces a fast, yet pixilated, tone mapping preview with visual similarities to its full resolution tone mapping. Although this technique is not suitable for large resolution images (in excess of 4-million pixels), empirical results from the prototype implementation indicate previews can be computed within seconds given current hardware capabilities. |
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