X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=dof.lisp;h=f1cd7b245a71b07bd95e1afdcfcf81a5bc15bcce;hb=6290486a001d80c01676dfd9c2ac053cb4bc1871;hp=4117c5a0f7d703dacce30a0e2cd51315c211945f;hpb=3c1c551f36fe090936bf5d21e7eb65acbcc0d457;p=cl-photo.git

diff --git a/dof.lisp b/dof.lisp
old mode 100755
new mode 100644
index 4117c5a..f1cd7b2
--- a/dof.lisp
+++ b/dof.lisp
@@ -19,24 +19,34 @@
 
 (in-package #:photo)
 
-(defun coc (imager-size &key (lpm 5) (minimum-distance 250) 
+(defun sort-size (size)
+  "Returns a cons pair with the smaller size first."
+  (if (>= (car size) (cdr size))
+      (cons (cdr size) (car size))
+      (cons (car size) (cdr size))))
+
+(defun print-magnification (imager-size print-size)
+  "Returns the magnification required between an imager and print sizes
+while taking crop into consideration."
+  (setf imager-size (sort-size imager-size))
+  (setf print-size (sort-size print-size))
+  (float (max (/ (car print-size) (car imager-size))
+              (/ (cdr print-size) (cdr print-size)))))
+
+(defun coc (imager-size &key (lpm 5) (minimum-distance 250)
                    (viewing-distance 250)
                    (print-size (output-dimensions :8x10in)))
-  "Returns circle of confusion in mm and print magnification for a format. 
+  "Returns circle of confusion in mm and print magnification for a format.
 Default resolving power is 5 lpm at 25cm."
+  (let* ((magnification (print-magnification imager-size print-size))
+         (resolution-factor (/ (* magnification lpm minimum-distance) viewing-distance))
+         (coc (/ 1.0d0 resolution-factor)))
+    (values coc magnification)))
 
-  (let* ((imager-diagonal (diagonal (car imager-size) (cdr imager-size)))
-         (print-diagonal (diagonal (car print-size) (cdr print-size)))
-         (resolution-factor (/ (* lpm print-diagonal minimum-distance)
-                               (* imager-diagonal viewing-distance)))
-         (coc (/ 1.0d0 resolution-factor))
-         (print-magnification (/ print-diagonal imager-diagonal)))
-    (values coc print-magnification)))
-
-(defun coc-format (format &key (lpm 5) (minimum-distance 250) 
+(defun coc-format (format &key (lpm 5) (minimum-distance 250)
                           (viewing-distance 250)
                           (print-size (output-dimensions :8x10in)))
-  "Returns circle of confusion in mm and print magnification for a format. 
+  "Returns circle of confusion in mm and print magnification for a format.
 Default resolving power is 5 lpm at 25cm."
 
   (let* ((format-size (imager-dimensions format))
@@ -49,27 +59,36 @@ Default resolving power is 5 lpm at 25cm."
     (values coc print-magnification)))
 
 (defun coc-pixels (imager pixels)
-  "Returns circle of confusion based on pixel size."
+  "Returns lpm and circle of confusion based on pixel size."
   (when (and (consp imager) (consp pixels))
-    (values (float (* 2 (/ (car imager) (car pixels))))
-            (float (* 2 (/ (cdr imager) (cdr pixels)))))))
-  
+    (let ((coc-w (float (* 2 (/ (car imager) (car pixels)))))
+          (coc-h (float (* 2 (/ (cdr imager) (cdr pixels))))))
+    (values coc-w coc-h (/ 1. coc-w) (/ 1. coc-h)))))
+
 (defun coc-pixels-format (format)
   "Returns circle of confusion based on pixel size."
   (coc-pixels (imager-dimensions format) (pixel-dimensions format)))
 
-(defun coc-airy (f-stop)
+(defun coc-airy (f-stop &optional (wavelength 0.000512))
   "Return the circle of confusion based on the airy disk."
-  (let ((airy (/ f-stop 1500)))
-    (float (* 2 airy))))
+  (float (/ 1 (rayleigh-limit f-stop wavelength))))
+
+(defun rayleigh-limit (f-stop &optional (wavelength 0.0005))
+  "Returns the rayleigh limit in line pairs per mm (MTF 9%) as well as the MTF50"
+  (let ((rayleigh (float (/ 1 1.22 f-stop wavelength))))
+    (values rayleigh (* 0.46 rayleigh))))
+
+(defun maximum-sharpness-aperture (format &optional (wavelength 0.0005))
+  (multiple-value-bind (coc-w coc-h lpm-w lpm-h) (coc-pixels-format format)
+    (declare (ignore coc-w coc-h))
+    (/ 1. (* 1.22 wavelength (/ (min lpm-w lpm-h) 0.46)))))
 
 (defun dof-mm (focal-length f-stop distance coc &key (pupil-factor 1))
   "Returns depth of field based on focal-length, f-stop, distance, and coc.
 Six values are returned:
-near dof, far dof, total dof, near point, far point, magnification,
-blur size at infinity (mm).
+near point, far point, total dof, magnification, blur size at infinity (mm).
 Circle of confusion can either be a number or keyword designating format."
-  (let* ((aperture (/ focal-length f-stop)) 
+  (let* ((aperture (/ focal-length f-stop))
          (numerator-1 (* (- pupil-factor 1) (- distance focal-length)
                          coc focal-length))
          (numerator-2 (* pupil-factor aperture focal-length distance))
@@ -105,10 +124,10 @@ Pupil factor is the ratio of the exit to enterance pupil diameters."
 
 (defun dof (focal-length f-stop distance coc &key (units :mm) (pupil-factor 1))
   "Returns the Depth of Field.
-Input: FOCAL-LENGTH, F-STOP, DISTANCE, CIRCLE-OF-CONFUSION. 
+Input: FOCAL-LENGTH, F-STOP, DISTANCE, CIRCLE-OF-CONFUSION.
 Output: NEAR-POINT, FAR-POINT, TOTAL-DOF, MAGNIFICATION, BLUR-SIZE-OF-INFINITY-POINT-IN-MM."
   (multiple-value-bind (near-point far-point total-dof mag blur)
-      (dof-mm focal-length f-stop (length->mm distance units) coc 
+      (dof-mm focal-length f-stop (length->mm distance units) coc
               :pupil-factor pupil-factor)
     (values (mm->length near-point units)
             (mm->length far-point units)
@@ -120,3 +139,7 @@ Output: NEAR-POINT, FAR-POINT, TOTAL-DOF, MAGNIFICATION, BLUR-SIZE-OF-INFINITY-P
 
 (defun effective-aperture (focal-length distance aperture)
   (* aperture (bellows-factor focal-length distance)))
+
+(defun mtf-scanner (freq dscan-freq &optional (order 3))
+  (abs (expt (kmrcl:sinc (* pi (/ freq dscan-freq))) order)))
+