filter: circle-ci fix

filter/filters_circleci.go

@@ -28,6 +28,7 @@ LICENSE
 package filter
 
 import (
+	"image"
 	"io"
 )
 
@@ -45,3 +46,16 @@ func NewKNN(dst io.WriteCloser, area, threshold float64, history, kernelSize int
 func NewDifference(dst io.WriteCloser, threshold float64) *NoOp {
 	return &NoOp{dst: dst}
 }
+
+// debugWindows is used for displaying debug information for the motion filters.
+type debugWindows struct{}
+
+// close frees resources used by gocv.
+func (d *debugWindows) close() error { return nil }
+
+// newWindows creates debugging windows for the motion filter.
+func newWindows(name string) debugWindows { return debugWindows{} }
+
+// show displays debug information for the motion filters.
+func (d *debugWindows) show(img, imgDelta interface{}, motion bool, contours *[][]image.Point, text ...string) {
+}