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require 'image'
torch.setdefaulttensortype('torch.FloatTensor')
torch.setnumthreads(16)
local function test_rotate(src, mode)
torch.manualSeed(11)
local mean_dist = 0.0
for i = 1, 10 do
local theta = torch.uniform(0, 2 * math.pi)
local d1, d2, d3, d4
-- rotate
if mode then
d1 = image.rotate(src, theta, mode)
d2 = src.new():resizeAs(src)
image.rotate(d2, src, theta, mode)
else
d1 = image.rotate(src, theta)
d2 = src.new():resizeAs(src)
image.rotate(d2, src, theta)
end
-- revert
local revert = 2 * math.pi - theta
if mode then
d3 = image.rotate(d1, revert, mode)
d4 = src.new():resizeAs(src)
image.rotate(d4, d2, revert, mode)
else
d3 = image.rotate(d1, revert)
d4 = src.new():resizeAs(src)
image.rotate(d4, d2, revert)
end
-- diff
if src:dim() == 3 then
local cs = image.crop(src, src:size(2) / 4, src:size(3) / 4, src:size(2) / 4 * 3, src:size(3) / 4 * 3)
local c3 = image.crop(d3, src:size(2) / 4, src:size(3) / 4, src:size(2) / 4 * 3, src:size(3) / 4 * 3)
local c4 = image.crop(d4, src:size(2) / 4, src:size(3) / 4, src:size(2) / 4 * 3, src:size(3) / 4 * 3)
mean_dist = mean_dist + cs:dist(c3)
mean_dist = mean_dist + cs:dist(c4)
elseif src:dim() == 2 then
local cs = image.crop(src, src:size(1) / 4, src:size(2) / 4, src:size(1) / 4 * 3, src:size(2) / 4 * 3)
local c3 = image.crop(d3, src:size(1) / 4, src:size(2) / 4, src:size(1) / 4 * 3, src:size(2) / 4 * 3)
local c4 = image.crop(d4, src:size(1) / 4, src:size(2) / 4, src:size(1) / 4 * 3, src:size(2) / 4 * 3)
mean_dist = mean_dist + cs:dist(c3)
mean_dist = mean_dist + cs:dist(c4)
end
--[[
if i == 1 then
image.display(src)
image.display(d1)
image.display(d2)
image.display(d3)
image.display(d4)
end
--]]
end
if mode then
print("mode = " .. mode .. ", mean dist: " .. mean_dist / (10 * 2))
else
print("mode = nil, mean dist: " .. mean_dist / (10 * 2))
end
end
local src = image.scale(image.lena(), 128, 128, 'bilinear')
print("** dim3")
test_rotate(src, nil)
test_rotate(src, 'simple')
test_rotate(src, 'bilinear')
print("** dim2")
src = src:select(1, 1)
test_rotate(src, nil)
test_rotate(src, 'simple')
test_rotate(src, 'bilinear')
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