An Efficient Implementation of Image Mipmapping using Frequency Domain Techniques
Chunduri SreenivasaRao, Babusa Dudekula, Sathyasri Nukala · International Journal of Engineering and Technology · 2017
Mipmapping is a popular technique, generally, used in real time processors to increase rendering speed and minimize aliasing effects.The basic idea of this technique is to construct a pyramid of binary fractioned downscaled images of the original image.The existing time domain convolution approach suffers from more computations for downscaling of images, particularly when the image resolution is very high.In this paper, frequency domain based overlap save method along with basic FFT properties is explained on how to implement mipmaps efficiently, aiming at less computations.The theoretical computations were provided of the proposed approach.The proposed approach was implemented on ADSP-BF533 DSP processor for different resolutions of input images.The computational comparison clearly reveals that the proposed approach is attractive to be used in scaling at very high resolution images and provides good performance than time domain filtering.The experimental results also show that proposed approach does not degrade the quality of the downscaled images based on the measurement of PSNR between proposed and time domain techniques.Keyword-