(in-package #:photo)
+(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.
+Default resolving power is 5 lpm at 25cm."
+
+ (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)
(viewing-distance 250)
- (print-size (format-dimensions :8x10in)))
+ (print-size (output-dimensions :8x10in)))
"Returns circle of confusion in mm and print magnification for a format.
Default resolving power is 5 lpm at 25cm."
- (let* ((format-size (format-dimensions format))
+ (let* ((format-size (imager-dimensions format))
(format-diagonal (diagonal (car format-size) (cdr format-size)))
(print-diagonal (diagonal (car print-size) (cdr print-size)))
(resolution-factor (/ (* lpm print-diagonal minimum-distance)
(print-magnification (/ print-diagonal format-diagonal)))
(values coc print-magnification)))
-(defun coc-sensor (format nx ny)
+(defun coc-pixels (imager pixels)
"Returns circle of confusion based on pixel size."
- (let* ((dim (format-dimensions format))
- (pixel-width (/ (car dim) nx))
- (pixel-height (/ (cdr dim) ny)))
- (values (float (* 2 pixel-width))
- (float (* 2 pixel-height)))))
-
-(defun coc-sensor-camera (camera &key (format :aps))
- (let ((dim (sensor-dimensions camera :format format)))
- (coc-sensor format (car dim) (cdr dim))))
-
-(defun sensor-dimensions-megapixels (format megapixels)
- (let* ((dim (format-dimensions format))
- (aspect-ratio (/ (car dim) (cdr dim)))
- (width (round (sqrt (* aspect-ratio 1000000 megapixels)))))
- (cons width (round (/ width aspect-ratio)))))
-
-
-(defun sensor-dimensions (sensor-spec &key (format :aps))
- "Returns the number of pixels for a sensor.
-CAMERA-SPEC is either a keyword designating the camera or
-the number of megapixels of the sensor.
-FORMAT should be defined if the CAMERA-SPEC is the number of megapixels
-so the proper aspect ratio is used."
- (etypecase sensor-spec
- (keyword
- (ecase sensor-spec
- ;; nikon
- (:d2x (cons 4288 2848))
- (:d100 (cons 3037 2024))
- (:d2h (cons 2464 1632))
- (:d70 (cons 3008 2000))
-
- ;; canon
- (:1d (cons 2464 1648))
- (:1d2 (cons 3504 2336))
- (:1ds (cons 4064 2704))
- (:1ds2 (cons 4992 3328))
-
- ))
- (number
- (sensor-dimensions-megapixels format sensor-spec))))
+ (when (and (consp imager) (consp pixels))
+ (values (float (* 2 (/ (car imager) (car pixels))))
+ (float (* 2 (/ (cdr imager) (cdr pixels)))))))
+
+(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)
"Return the circle of confusion based on the airy disk."
(values near far depth mag infinity-blur-diameter)))
(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.
+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
:pupil-factor pupil-factor)
mag blur)))
(defun hyperfocal (focal-length f-stop coc &key (units :mm))
- (mm->length
- (+ focal-length (/ (* focal-length focal-length) f-stop coc))
- units))
-
-(defun magnification (focal-length distance)
- (float (/ focal-length (- distance focal-length))))
-
-(defun bellows-factor (focal-length distance)
- (1+ (magnification focal-length distance)))
+ (mm->length (+ focal-length (/ (* focal-length focal-length) f-stop coc)) units))
(defun effective-aperture (focal-length distance aperture)
- (* aperture (bellows-factor focal-length distance)))
\ No newline at end of file
+ (* aperture (bellows-factor focal-length distance)))