new DFT class created

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
apply filter

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
lowpass/highpass added

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
filters

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
bandpass filter added

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
notch filter added

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
support added for 3 channel filters

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
more support

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
Docs added

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
function added to apply DFT filter in Image

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
DFT tests added

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
merge fix for Jay