Compression of MR Images Using DWT by Comparing RGB and YCbCr Color Spaces
Open Access JSIP
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Table 1. PSNR, and bpp for different test medical images of RGB and YCbCr color space.
PSNR bpp
Medical
Images R G B Y Cb Cr R G B Y Cb Cr
MR1 11.83 11. 83 11. 84 12.91 57.93 58.63 0.279 0.279 0.278 0.301 0.502 0.502
MR2 13.28 13.28 13.25 14.26 50.52 47.54 0.225 0.226 0.205 0.253 0.491 0.503
MR3 14.66 14.61 14.76 15.85 36.02 34.1 0.293 0.289 0.287 0.310 0.500 0.504
MR4 11.66 11. 54 11. 57 12.49 43.85 41.85 0.226 0.223 0.226 0.255 0.503 0.503
MR5 16.84 16.84 16.84 18.08 42.94 60.78 0.226 0.223 0.226 0.255 0.503 0.503
MR6 17.4 17.29 17.24 18.47 52.93 51.08 0.075 0.082 0.088 0.131 0.505 0.498
MR7 18.37 18.37 18.37 19.61 147 147 0.118 0.118 0.118 0.163 0.502 0.502
MR8 18.38 18.38 18.38 19.61 147 147 0.141 0.141 0.141 0.183 0.502 0.502
MR9 18.62 18.62 18.62 19.85 147 147 0.140 0.140 0.140 0.182 0.502 0.502
MR10 16.57 16.57 16.57 17.81 147 147 0.268 0.268 0.268 0.292 0.502 0.502
15.761 15.733 15.744 16.894 87.21988.1980.188 0.190 0.189 0.223 0.502 0.502
parameters PSNR and bpp are generally used for assess-
ing the quality of the reconstructed image. Earlier studies
[1-8,13,14] discussed the image compression and [4-6]
addressed the compression of images. The results were
obtained in the present study, using the preprocessing
step followed by the bisection method including thresh-
olding, the quantization, dequantization and the IDWT
were compared with the 3-D transforms, such as discrete
Hartley transform (DHT), discrete cosine transform
(DCT) and discrete Fourier transform (DFT) [6]. From
Table 1 high bit rate result improved the quality of the
reconstructed image. The performance of the MRI com-
pression using algorithm yielded better results than other
transforms. It can be concluded that YCbCr color space
was found to be better PSNR than the RGB color space.
The user can improve the bit rate and CR depending on
his reconstructed image quality requirements.
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