Difference between videoscale and videobox

[Baby Octopus]

I would want to scale an image with letter box for maintaining display aspect
ratio. I tried to upscale a 352x288 image to 640x360 by running the below
mentioned command. I'm not satisfied with the result. Input is
http://i49.tinypic.com/os51r6.png but the result is
http://i47.tinypic.com/25ksm6s.png 

gst-launch-1.0 -v filesrc location=/mnt/temp/cif_test.yuv ! videoparse
width=352 height=288 ! videoscale add-borders=1  !
video/x-raw,width=640,height=360  !  filesink location=/mnt/temp/out.yuv

My log looked like 

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstVideoParse:videoparse0.GstPad:src: caps =
video/x-raw, format=(string)I420, width=(int)352, height=(int)288,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)25/1
/GstPipeline:pipeline0/GstVideoScale:videoscale0.GstPad:src: caps =
video/x-raw, format=(string)I420, width=(int)640, height=(int)360,
pixel-aspect-ratio=(fraction)11/16, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)25/1
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps =
video/x-raw, format=(string)I420, width=(int)640, height=(int)360,
pixel-aspect-ratio=(fraction)11/16, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)25/1
/GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps =
video/x-raw, format=(string)I420, width=(int)640, height=(int)360,
pixel-aspect-ratio=(fraction)11/16, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)25/1
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps =
video/x-raw, format=(string)I420, width=(int)640, height=(int)360,
pixel-aspect-ratio=(fraction)11/16, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)25/1
/GstPipeline:pipeline0/GstVideoScale:videoscale0.GstPad:sink: caps =
video/x-raw, format=(string)I420, width=(int)352, height=(int)288,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)25/1
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Got EOS from element "pipeline0".
Execution ended after 3051953093 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...






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