Get rid of the chunk code, and recompute the grid within the zoom traverse.

[spline3.git] / src / MRI.hs

diff --git a/src/MRI.hs b/src/MRI.hs
index ce1bb7d9d078e567ebde68323d1b112e4e9166f3..8e2b0acb96303b03339e15ae94d487ce972f36e8 100644 (file)
--- a/src/MRI.hs
+++ b/src/MRI.hs
@@ -6,6 +6,7 @@ import Data.Bits
 import Data.Array.Repa                  as R
 import Data.Array.Repa.IO.Binary        as R
 import Data.Array.Repa.IO.ColorRamp     as R
+import Data.Array.Repa.IO.BMP           as R (writeComponentsToBMP)
 
 import Values
 
@@ -21,10 +22,10 @@ mri_height = 256
 mri_shape :: DIM3
 mri_shape = (Z :. mri_depth :. mri_height :. mri_width)
 
-mri_lower_threshold :: Int
+mri_lower_threshold :: Double
 mri_lower_threshold = 1400
 
-mri_upper_threshold :: Int
+mri_upper_threshold :: Double
 mri_upper_threshold = 2500
 
 mri_slice3d :: DIM3
@@ -48,14 +49,14 @@ read_word16s path = do
 
 
 {-# INLINE bracket #-}
-bracket :: Int -> Int -> Int -> Word16
-bracket low high x
-        | x < low      = 0
-        | x > high     = 255
-        | otherwise    = truncate (r * 255)
+bracket :: Double -> Word16
+bracket x
+        | x < mri_lower_threshold      = 0
+        | x > mri_upper_threshold      = 255
+        | otherwise                    = truncate (r * 255)
             where
-              numerator = fromIntegral (x - low) :: Double
-              denominator = fromIntegral (high - low) :: Double
+              numerator = x - mri_lower_threshold
+              denominator = mri_upper_threshold - mri_lower_threshold
               r = numerator/denominator
 
 
@@ -69,11 +70,11 @@ swap_bytes :: (Shape sh) => (RawData sh) -> (RawData sh)
 swap_bytes arr =
     R.force $ R.map flip16 arr
 
-bracket_array :: (Shape sh) => (RawData sh) -> (RawData sh)
+bracket_array :: (Shape sh) => (Values sh) -> (RawData sh)
 bracket_array arr =
   R.force $ R.map f arr
   where
-    f = (bracket mri_lower_threshold mri_upper_threshold) . fromIntegral
+    f = bracket
 
 
 flip_y :: RawData3D -> RawData3D
@@ -139,3 +140,33 @@ blue_dbl_data =
 z_slice :: Elt a => Int -> Array DIM3 a -> Array DIM2 a
 z_slice n arr =
   slice arr (Any :. n :. All :. All)
+
+
+transpose_zx :: Elt a => Array DIM3 a -> Array DIM3 a
+transpose_zx arr =
+  traverse arr
+           (\(Z :. zdim :. ydim :. xdim) -> (Z :. xdim :. ydim :. zdim))
+           (\_ -> (\(Z :. z :. y :. x) -> arr ! (Z :. x :. y :. z)))
+
+
+z_slice3 :: Elt a => Int -> Array DIM3 a -> Array DIM3 a
+z_slice3 n arr
+  | n == 0 = transpose_zx $ current R.++ next
+  | n == zdim-1 = transpose_zx $ previous R.++ current
+  | otherwise = transpose_zx $ previous R.++ current R.++ next
+  where
+    (Z :. zdim :. _ :. _) = extent arr
+    previous = transpose_zx $ reshape mri_slice3d (z_slice (n-1) arr)
+    current = transpose_zx $ reshape mri_slice3d (z_slice n arr)
+    next = transpose_zx $ reshape mri_slice3d (z_slice (n+1) arr)
+
+
+write_values_slice_to_bitmap :: Values2D -> FilePath -> IO ()
+write_values_slice_to_bitmap v3d path =
+  R.writeComponentsToBMP path routput goutput boutput
+  where
+    arr_bracketed = bracket_array v3d
+    colors = values_to_colors $ R.map fromIntegral arr_bracketed
+    routput = R.map (\(red, _,     _)    -> red)   colors
+    goutput = R.map (\(_,   green, _)    -> green) colors
+    boutput = R.map (\(_,   _,     blue) -> blue)  colors