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I get features from goodFeaturesToTrack. Then I use Lucas-Kanade optiacal flow to get new vector. To subtruct two vectors(current and previous) I use: Mat dist = Mat(features_next) - Mat(features_prev); "сout<<dist&lt;<endl;" send="" me="" something="" like="" this:="" [-8.173645,="" 1.7280884;="" -9.0476074,="" 1.3460178;="" -8.053894,="" 1.6729126;="" -8.3344727,="" 1.5041504;="" -8.4681396,="" 1.2983398;="" -7.7624168,="" 1.3024292;="" -7.5558472,="" 1.5894165;="" -6.0166016,="" -6.3443604;="" -8.6588135,="" 1.4471436;="" -8.5440674,="" 1.5252075;="" -8.5332642,="" 1.2217712;="" -9.019043,="" 1.1412964;="" -8.1793213,="" 1.1274414;="" -8.4523926,="" 1.3099365;="" -8.0050659,="" 1.4452515;="" -7.769989,="" 1.5503235;="" -8.8361816,="" 1.4925537;="" -8.8579407,="" 1.8752441;="" -7.7745361,="" 1.0702209;="" -7.8722687,="" 1.7235107]="" what="" is="" this?="" where="" are="" my="" coordinates?="" is="" there="" another="" way="" to="" subtract="" them?<="" p="">

I get features from goodFeaturesToTrack. Then I use Lucas-Kanade optiacal flow to get new vector. To subtruct two vectors(current and previous) I use: Mat dist = Mat(features_next) - Mat(features_prev); "сout<<dist&lt;<endl;" send="" me="" something="" like="" this:="" [-8.173645,="" 1.7280884;="" -9.0476074,="" 1.3460178;="" -8.053894,="" 1.6729126;="" -8.3344727,="" 1.5041504;="" -8.4681396,="" 1.2983398;="" -7.7624168,="" 1.3024292;="" -7.5558472,="" 1.5894165;="" -6.0166016,="" -6.3443604;="" -8.6588135,="" 1.4471436;="" -8.5440674,="" 1.5252075;="" -8.5332642,="" 1.2217712;="" -9.019043,="" 1.1412964;="" -8.1793213,="" 1.1274414;="" -8.4523926,="" 1.3099365;="" -8.0050659,="" 1.4452515;="" -7.769989,="" 1.5503235;="" -8.8361816,="" 1.4925537;="" -8.8579407,="" 1.8752441;="" -7.7745361,="" 1.0702209;="" -7.8722687,="" 1.7235107]="" what="" is="" this?="" where="" are="" my="" coordinates?="" is="" there="" another="" way="" to="" subtract="" them?<="" this:<="" p="">

I get features from goodFeaturesToTrack. Then I use Lucas-Kanade optiacal flow to get new vector. To subtruct two vectors(current and previous) I use: Mat dist = Mat(features_next) - Mat(features_prev); "сout<<dist&lt;<endl;" send="" me="" something="" like="" this:<="" p="">

[-8.173645, 1.7280884; -9.0476074, 1.3460178; -8.053894, 1.6729126; -8.3344727, 1.5041504; -8.4681396, 1.2983398; -7.7624168, 1.3024292; -7.5558472, 1.5894165; -6.0166016, -6.3443604; -8.6588135, 1.4471436; -8.5440674, 1.5252075; -8.5332642, 1.2217712; -9.019043, 1.1412964; -8.1793213, 1.1274414; -8.4523926, 1.3099365; -8.0050659, 1.4452515; -7.769989, 1.5503235; -8.8361816, 1.4925537; -8.8579407, 1.8752441; -7.7745361, 1.0702209; -7.8722687, 1.7235107]

What is this? Where are my coordinates? Is there another way to subtract them?

I get features from goodFeaturesToTrack. Then I use Lucas-Kanade optiacal flow to get new vector. To subtruct two vectors(current and previous) I use: Mat dist = Mat(features_next) - Mat(features_prev); "сout<<dist&lt;<endl;" send="" me="" something="" like="" this:<="" p=""> Mat(features_prev);. сout<<dist<<endl; send me something like this:

[-8.173645, 1.7280884;
 -9.0476074, 1.3460178;
 -8.053894, 1.6729126;
 -8.3344727, 1.5041504;
 -8.4681396, 1.2983398;
 -7.7624168, 1.3024292;
 -7.5558472, 1.5894165;
 -6.0166016, -6.3443604;
 -8.6588135, 1.4471436;
 -8.5440674, 1.5252075;
 -8.5332642, 1.2217712;
 -9.019043, 1.1412964;
 -8.1793213, 1.1274414;
 -8.4523926, 1.3099365;
 -8.0050659, 1.4452515;
 -7.769989, 1.5503235;
 -8.8361816, 1.4925537;
 -8.8579407, 1.8752441;
 -7.7745361, 1.0702209;
 -7.8722687, 1.7235107]
1.7235107]