It　is　difficult　to　extract　the　motion　information　between　the　camera　and　the　object　surface　with　the　model　matching　or　the　optical　flow　method　when　there　is　only　texture　structure　on　the　object　surface　for　observing.　Arranging　the　spatio-temporal　images　with　the　time　order　and　cutting　the　images　array　along　a.　row　or　a　column,　a　spatio-temporal　slice　image　appears.　Different　camera　motion　reaches　different　slice　image　and　the　camera　motion　information　can　be　extracted　by　analyzing　this　kind　of　slice　images.　Differ　from　the　common　spatio-temporal　slice　analysis　methods,　a　measurement　parameter　to　describe　the　texture　elements　distribute　density　is　present　in　this　paper.　Camera　motion　information　can　be　extracted　by　analyzing　this　parameter　in　spatio-temporal　slices　of　different　positions.