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convolve.lisp
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convolve.lisp
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;;; Copyright (c) 2011 Cyrus Harmon, All rights reserved.
;;; See COPYRIGHT file for details.
(in-package :opticl)
(defun normalize-array (array &key element-type)
(let ((sum (coerce (sum array) 'double-float)))
(if (zerop sum)
array
(apply #'map-array (lambda (n) (/ n sum)) array
:force-simple t
(when element-type `(:element-type ,element-type))))))
(defun discrete-convolve (u v)
"Perform a discrete convolution of matrix u with matrix v"
(let ((fit-function
(let ((type (array-element-type u)))
(cond
((equal type '(unsigned-byte 1))
(make-constrain-fn 0 1))
((equal type '(unsigned-byte 2))
(make-constrain-fn 0 3))
((equal type '(unsigned-byte 4))
(make-constrain-fn 0 15))
((equal type '(unsigned-byte 8))
(make-constrain-fn 0 255))
((equal type '(unsigned-byte 16))
(make-constrain-fn 0 #xffff))
((equal type '(unsigned-byte 32))
(make-constrain-fn 0 #xffffffff))
(t #'identity)))))
(with-image-bounds (vr vc) v
(unless (and (= vr vc)
(oddp vr))
(error "convolution matrix bust be square and of odd dimensions"))
(let ((span (ash vr -1)))
(declare (type fixnum span))
(with-image-bounds (ur uc channels) u
(let ((zr (+ ur vr -1))
(zc (+ uc vc -1)))
(let ((z (make-array (apply #'list zr zc
(when channels (list channels)))
:element-type (array-element-type u))))
;; let's speed this up for some common cases:
(cond
((and (typep u '8-bit-gray-image)
(typep v 'double-float-gray-image))
(locally
(declare (type 8-bit-gray-image u z)
(type double-float-gray-image v)
(type fixnum span)
(optimize (speed 3)))
(do-pixels (i j) z
(let ((acc-k 0d0))
(declare (type double-float acc-k))
(loop for ui fixnum from (logand #xffffffff (- i span))
to (logand #xffffffff (+ i span))
for vi fixnum downfrom (1- vr) downto 0
do (loop for uj fixnum from (logand #xffffffff (- j span))
to (logand #xffffffff (+ j span))
for vj fixnum downfrom (1- vc) downto 0
do
(let ((ui* (constrain ui 0 (1- ur)))
(uj* (constrain uj 0 (1- uc))))
(incf acc-k (* (aref v vi vj) (pixel u ui* uj*))))))
(setf (pixel z i j) (cond ((<= acc-k 0d0) 0)
((>= acc-k 255d0) 255)
(t (round acc-k))))))))
((and (typep u '16-bit-gray-image)
(typep v 'double-float-gray-image))
(locally
(declare (type 16-bit-gray-image u z)
(type double-float-gray-image v)
(type fixnum span)
(optimize (speed 3)))
(do-pixels (i j) z
(let ((acc-k 0d0))
(declare (type double-float acc-k))
(loop for ui fixnum from (logand #xffffffff (- i span))
to (logand #xffffffff (+ i span))
for vi fixnum downfrom (1- vr) downto 0
do (loop for uj fixnum from (logand #xffffffff (- j span))
to (logand #xffffffff (+ j span))
for vj fixnum downfrom (1- vc) downto 0
do
(let ((ui* (constrain ui 0 (1- ur)))
(uj* (constrain uj 0 (1- uc))))
(incf acc-k (* (aref v vi vj) (pixel u ui* uj*))))))
(setf (pixel z i j) (cond ((<= acc-k 0d0) 0)
((>= acc-k #xffff) #xffff)
(t (round acc-k))))))))
((and (typep u '8-bit-rgb-image)
(typep v 'double-float-gray-image))
(locally
(declare (type 8-bit-rgb-image u z)
(type double-float-gray-image v)
(type fixnum span)
(optimize (speed 3)))
(do-pixels (i j) z
(let ((acc-r 0d0) (acc-g 0d0) (acc-b 0d0))
(declare (type double-float acc-r acc-g acc-b))
(loop for ui fixnum from (logand #xffffffff (- i span))
to (logand #xffffffff (+ i span))
for vi fixnum downfrom (1- vr) downto 0
do (loop for uj fixnum from (logand #xffffffff (- j span))
to (logand #xffffffff (+ j span))
for vj fixnum downfrom (1- vc) downto 0
do
(let ((ui* (constrain ui 0 (1- ur)))
(uj* (constrain uj 0 (1- uc)))
(v-val (aref v vi vj)))
(declare (type double-float v-val))
(multiple-value-bind (r g b) (pixel u ui* uj*)
(declare (type (unsigned-byte 8) r g b))
(setf acc-r (+ acc-r (* r v-val)))
(setf acc-g (+ acc-g (* g v-val)))
(setf acc-b (+ acc-b (* b v-val)))))))
(setf (pixel z i j) (values
(cond ((<= acc-r 0d0) 0)
((>= acc-r 255d0) 255)
(t (round acc-r)))
(cond ((<= acc-g 0d0) 0)
((>= acc-g 255d0) 255)
(t (round acc-g)))
(cond ((<= acc-b 0d0) 0)
((>= acc-b 255d0) 255)
(t (round acc-b)))))))))
((and (typep u '16-bit-rgb-image)
(typep v 'double-float-gray-image))
(locally
(declare (type 16-bit-rgb-image u z)
(type double-float-gray-image v)
(type fixnum span)
(optimize (speed 3)))
(do-pixels (i j) z
(let ((acc-r 0d0) (acc-g 0d0) (acc-b 0d0))
(declare (type double-float acc-r acc-g acc-b))
(loop for ui fixnum from (logand #xffffffff (- i span))
to (logand #xffffffff (+ i span))
for vi fixnum downfrom (1- vr) downto 0
do (loop for uj fixnum from (logand #xffffffff (- j span))
to (logand #xffffffff (+ j span))
for vj fixnum downfrom (1- vc) downto 0
do
(let ((ui* (constrain ui 0 (1- ur)))
(uj* (constrain uj 0 (1- uc)))
(v-val (aref v vi vj)))
(declare (type double-float v-val))
(multiple-value-bind (r g b) (pixel u ui* uj*)
(declare (type (unsigned-byte 16) r g b))
(setf acc-r (+ acc-r (* r v-val)))
(setf acc-g (+ acc-g (* g v-val)))
(setf acc-b (+ acc-b (* b v-val)))))))
(setf (pixel z i j) (values
(cond ((<= acc-r 0d0) 0)
((>= acc-r #xffff) #xffff)
(t (round acc-r)))
(cond ((<= acc-g 0d0) 0)
((>= acc-g #xffff) #xffff)
(t (round acc-g)))
(cond ((<= acc-b 0d0) 0)
((>= acc-b #xffff) #xffff)
(t (round acc-b)))))))))
((and (typep u '8-bit-rgba-image)
(typep v 'double-float-gray-image))
(locally
(declare (type 8-bit-rgba-image u z)
(type double-float-gray-image v)
(type fixnum span)
(optimize (speed 3)))
(do-pixels (i j) z
(let ((acc-r 0d0) (acc-g 0d0) (acc-b 0d0)
(acc-k
(nth-value 3 (pixel u
(constrain i 0 (1- ur))
(constrain j 0 (1- uc))))))
(declare (type double-float acc-r acc-g acc-b)
(type (unsigned-byte 8) acc-k))
(loop for ui fixnum from (logand #xffffffff (- i span))
to (logand #xffffffff (+ i span))
for vi fixnum downfrom (1- vr) downto 0
do
(let ((ui* (constrain ui 0 (1- ur))))
(loop for uj fixnum from (logand #xffffffff (- j span))
to (logand #xffffffff (+ j span))
for vj fixnum downfrom (1- vc) downto 0
do
(let ((uj* (constrain uj 0 (1- uc)))
(v-val (aref v vi vj)))
(declare (type double-float v-val))
(multiple-value-bind (r g b) (pixel u ui* uj*)
(declare (type (unsigned-byte 8) r g b))
(setf acc-r (+ acc-r (* r v-val)))
(setf acc-g (+ acc-g (* g v-val)))
(setf acc-b (+ acc-b (* b v-val))))))))
(setf (pixel z i j)
(values
(cond ((<= acc-r 0d0) 0)
((>= acc-r 255d0) 255)
(t (round acc-r)))
(cond ((<= acc-g 0d0) 0)
((>= acc-g 255d0) 255)
(t (round acc-g)))
(cond ((<= acc-b 0d0) 0)
((>= acc-b 255d0) 255)
(t (round acc-b)))
;; keep the alpha value constant?!?
acc-k))))))
(t
(do-pixels (i j) z
(let ((acc (if channels
(make-list channels :initial-element 0)
0)))
(loop for ui fixnum from (- i span) to (+ i span)
for vi fixnum downfrom (1- vr) downto 0
do (loop for uj fixnum from (- j span) to (+ j span)
for vj fixnum downfrom (1- vc) downto 0
do
(let ((ui* (constrain ui 0 (1- ur)))
(uj* (constrain uj 0 (1- uc))))
(if channels
(setf acc (mapcar (lambda (a q) (+ a (* q (aref v vi vj))))
acc
(multiple-value-list (pixel u ui* uj*))))
(incf acc (* (pixel u ui* uj*) (aref v vi vj)))))))
(if channels
(setf (pixel z i j) (values-list (mapcar fit-function acc)))
(setf (pixel z i j) (funcall fit-function acc)))))))
z)))))))
(defparameter *gaussian-kernel*
(normalize-array #2A((1 2 1)
(2 4 2)
(1 2 1))
:element-type 'double-float))
(defun blur-image (img)
(trim-image
(discrete-convolve img *gaussian-kernel*) 1 1))
(defparameter *sharpen-kernel*
(normalize-array #2A((-1 -4 -1)
(-4 26 -4)
(-1 -4 -1))
:element-type 'double-float))
(defun sharpen-image (img)
(trim-image
(discrete-convolve img *sharpen-kernel*) 1 1))