diff options
| -rw-r--r-- | integralimg.go | 40 |
1 files changed, 20 insertions, 20 deletions
diff --git a/integralimg.go b/integralimg.go index 9b9ad16..afdbebe 100644 --- a/integralimg.go +++ b/integralimg.go @@ -14,8 +14,8 @@ import ( "math" ) -// I is the Integral Image -type I [][]uint64 +// Image is an integral Image +type Image [][]uint64 // SqImage is a Square integral Image. // A squared integral image is an integral image for which the square of @@ -23,16 +23,16 @@ type I [][]uint64 // Standard Deviation. type SqImage [][]uint64 -func (i I) ColorModel() color.Model { return color.Gray16Model } +func (i Image) ColorModel() color.Model { return color.Gray16Model } -func (i I) Bounds() image.Rectangle { +func (i Image) Bounds() image.Rectangle { return image.Rectangle {image.Point{0, 0}, image.Point{len(i[0]), len(i)}} } // at64 is used to return the raw uint64 for a given pixel. Accessing // this separately to a (potentially lossy) conversion to a Gray16 is // necessary for SqImage to function accurately. -func (i I) at64(x, y int) uint64 { +func (i Image) at64(x, y int) uint64 { if !(image.Point{x, y}.In(i.Bounds())) { return 0 } @@ -52,12 +52,12 @@ func (i I) at64(x, y int) uint64 { return orig } -func (i I) At(x, y int) color.Color { +func (i Image) At(x, y int) color.Color { c := i.at64(x, y) return color.Gray16{uint16(c)} } -func (i I) set64(x, y int, c uint64) { +func (i Image) set64(x, y int, c uint64) { var prevx, prevy, prevxy uint64 prevx, prevy, prevxy = 0, 0, 0 if x > 0 { @@ -73,15 +73,15 @@ func (i I) set64(x, y int, c uint64) { i[y][x] = final } -func (i I) Set(x, y int, c color.Color) { +func (i Image) Set(x, y int, c color.Color) { gray := color.Gray16Model.Convert(c).(color.Gray16).Y i.set64(x, y, uint64(gray)) } // NewImage returns a new integral Image with the given bounds. -func NewImage(r image.Rectangle) *I { +func NewImage(r image.Rectangle) *Image { w, h := r.Dx(), r.Dy() - var rows I + var rows Image for i := 0; i < h; i++ { col := make([]uint64, w) rows = append(rows, col) @@ -89,21 +89,21 @@ func NewImage(r image.Rectangle) *I { return &rows } -func (i SqImage) ColorModel() color.Model { return I(i).ColorModel() } +func (i SqImage) ColorModel() color.Model { return Image(i).ColorModel() } func (i SqImage) Bounds() image.Rectangle { - return I(i).Bounds() + return Image(i).Bounds() } func (i SqImage) At(x, y int) color.Color { - c := I(i).at64(x, y) + c := Image(i).at64(x, y) rt := math.Sqrt(float64(c)) return color.Gray16{uint16(rt)} } func (i SqImage) Set(x, y int, c color.Color) { gray := uint64(color.Gray16Model.Convert(c).(color.Gray16).Y) - I(i).set64(x, y, gray * gray) + Image(i).set64(x, y, gray * gray) } // NewSqImage returns a new squared integral Image with the given bounds. @@ -113,7 +113,7 @@ func NewSqImage(r image.Rectangle) *SqImage { return &s } -// Window is a part of an Integral Image +// Window is a section of an Integral Image type Window struct { topleft uint64 topright uint64 @@ -126,7 +126,7 @@ type Window struct { // GetWindow gets the values of the corners of a square part of an // Integral Image, plus the dimensions of the part, which can // be used to quickly calculate the mean of the area -func (i I) GetWindow(x, y, size int) Window { +func (i Image) GetWindow(x, y, size int) Window { step := size / 2 minx, miny := 0, 0 @@ -151,12 +151,12 @@ func (i I) GetWindow(x, y, size int) Window { } func (i SqImage) GetWindow(x, y, size int) Window { - return I(i).GetWindow(x, y, size) + return Image(i).GetWindow(x, y, size) } // GetVerticalWindow gets the values of the corners of a vertical // slice of an Integral Image, starting at x -func (i I) GetVerticalWindow(x, width int) Window { +func (i Image) GetVerticalWindow(x, width int) Window { maxy := len(i) - 1 maxx := x + width if maxx > len(i[0])-1 { @@ -167,7 +167,7 @@ func (i I) GetVerticalWindow(x, width int) Window { } func (i SqImage) GetVerticalWindow(x, width int) Window { - return I(i).GetVerticalWindow(x, width) + return Image(i).GetVerticalWindow(x, width) } // Sum returns the sum of all pixels in a Window @@ -196,7 +196,7 @@ func (w Window) Proportion() float64 { // MeanStdDevWindow calculates the mean and standard deviation of // a section on an Integral Image, using the corresponding Square // Integral Image. -func MeanStdDevWindow(i I, sq SqImage, x, y, size int) (float64, float64) { +func MeanStdDevWindow(i Image, sq SqImage, x, y, size int) (float64, float64) { imean := i.GetWindow(x, y, size).Mean() smean := sq.GetWindow(x, y, size).Mean() |