Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12938-017-0366-3/MediaObjects/12938_2017_366_Fig4_HTML.gif)
a, b Refer to the orientation field estimation results for two texture images in the last iteration of 30-view DDTV. The arrows stand for the direction for the blocks. The length of the arrows indicates the reliability of the estimated orientation field for that position