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78 lines
1.4 KiB
78 lines
1.4 KiB
// Copyright 2011 The Graphics-Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package convolve |
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import ( |
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"code.google.com/p/graphics-go/graphics/graphicstest" |
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"image" |
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"reflect" |
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"testing" |
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_ "image/png" |
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) |
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func TestSeparableWeights(t *testing.T) { |
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sobelXFull := []float64{ |
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-1, 0, 1, |
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-2, 0, 2, |
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-1, 0, 1, |
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} |
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sobelXSep := &SeparableKernel{ |
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X: []float64{-1, 0, +1}, |
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Y: []float64{1, 2, 1}, |
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} |
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w := sobelXSep.Weights() |
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if !reflect.DeepEqual(w, sobelXFull) { |
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t.Errorf("got %v want %v", w, sobelXFull) |
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} |
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} |
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func TestConvolve(t *testing.T) { |
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kernFull, err := NewKernel([]float64{ |
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0, 0, 0, |
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1, 1, 1, |
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0, 0, 0, |
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}) |
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if err != nil { |
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t.Fatal(err) |
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} |
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kernSep := &SeparableKernel{ |
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X: []float64{1, 1, 1}, |
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Y: []float64{0, 1, 0}, |
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} |
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src, err := graphicstest.LoadImage("../../testdata/gopher.png") |
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if err != nil { |
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t.Fatal(err) |
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} |
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b := src.Bounds() |
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sep := image.NewRGBA(b) |
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if err = Convolve(sep, src, kernSep); err != nil { |
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t.Fatal(err) |
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} |
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full := image.NewRGBA(b) |
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Convolve(full, src, kernFull) |
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err = graphicstest.ImageWithinTolerance(sep, full, 0x101) |
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if err != nil { |
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t.Fatal(err) |
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} |
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} |
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func TestConvolveNil(t *testing.T) { |
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if err := Convolve(nil, nil, nil); err != nil { |
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t.Fatal(err) |
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} |
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} |
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func TestConvolveEmpty(t *testing.T) { |
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empty := image.NewRGBA(image.Rect(0, 0, 0, 0)) |
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if err := Convolve(empty, empty, nil); err != nil { |
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t.Fatal(err) |
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} |
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}
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