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esimov
2018-07-03 09:18:55 +03:00
parent bf850ad014
commit 8accaed975
1 changed files with 3 additions and 3 deletions
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6
main.go
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@@ -183,7 +183,7 @@ func process(input image.Image, done chan struct{}) bool {
dctPixels[u] = make([]pixel, *blockSize) dctPixels[u] = make([]pixel, *blockSize)
for v := 0; v < *blockSize; v++ { for v := 0; v < *blockSize; v++ {
for i := i0; i < i1; i += 4 { for i := i0; i < i1; i += 4 {
// Get the YUV converted image pixels // Obtain the pixels converted to YUV color space
yc, uc, vc, _ := b.Pix[i+0], b.Pix[i+2], b.Pix[i+2], b.Pix[i+3] yc, uc, vc, _ := b.Pix[i+0], b.Pix[i+2], b.Pix[i+2], b.Pix[i+3]
// Convert YUV to RGB and obtain the R,G,B value // Convert YUV to RGB and obtain the R,G,B value
r, g, b := color.YCbCrToRGB(yc, uc, vc) r, g, b := color.YCbCrToRGB(yc, uc, vc)
@@ -203,7 +203,7 @@ func process(input image.Image, done chan struct{}) bool {
} }
} }
// normalization // Normalize alpha channel.
alpha := func(a float64) float64 { alpha := func(a float64) float64 {
if a == 0 { if a == 0 {
return math.Sqrt(1.0 / float64(n)) return math.Sqrt(1.0 / float64(n))
@@ -220,7 +220,7 @@ func process(input image.Image, done chan struct{}) bool {
dctPixels[u][v] = pixel{cr, cg, cb, cy} dctPixels[u][v] = pixel{cr, cg, cb, cy}
// Get the quantized DCT coefficients. // Obtain the quantized DCT coefficients.
if *blockSize <= 4 { if *blockSize <= 4 {
dctPixels[u][v].r = dctPixels[u][v].r / q4x4[u][v] dctPixels[u][v].r = dctPixels[u][v].r / q4x4[u][v]
dctPixels[u][v].g = dctPixels[u][v].g / q4x4[u][v] dctPixels[u][v].g = dctPixels[u][v].g / q4x4[u][v]