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png16debayer.py
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png16debayer.py
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# 趣味のPython学習 Project 02-03
# Python PNG16 DEBAYER
# ばーじょん 1.0.5
ver = "1.0.5"
import zlib
from PIL import Image
# NEED THIS ! get with pip command !
import imageio
# DATA ACCESS
def rdd(data,x,y,w,h) :
if x < 0 :
return 0
if y < 0 :
return 0
if x >= w :
return 0
if y >= h :
return 0
val = data[y][x]
# MIN-MAX CORRECT
if val > maxval :
val = maxval
val = val - minval
if val < 0 :
val = 0
if gnmval > 0.0 and gnmval != 1.0 :
val = int((maxval-minval)*(float(val)/(maxval-minval))**(1/gnmval))
return val
def conv16to64RGGBGRY(data,w,h) :
buffer = []
for y in range(0,h) :
for x in range(0,w) :
gry = rdd(data,x,y,w,h)
alp = 0xFF
buffer.append(alp)
buffer.append(gry)
buffer.append(gry)
buffer.append(gry)
return buffer
def conv16to64RGGB2x2(data,w,h) :
buffer = []
for y in range(0,h) :
for x in range(0,w) :
red = rdd(data,(x>>1)*2 + 0,(y>>1)*2 + 0,w,h)
gr1 = rdd(data,(x>>1)*2 + 1,(y>>1)*2 + 0,w,h)
gr2 = rdd(data,(x>>1)*2 + 0,(y>>1)*2 + 1,w,h)
blu = rdd(data,(x>>1)*2 + 1,(y>>1)*2 + 1,w,h)
# avoid over flow
grn = (( 0x0000FFFF & gr1 ) + gr2) // 2
alp = 0xFF
buffer.append(alp)
buffer.append(red)
buffer.append(grn)
buffer.append(blu)
return buffer
def RGGB3x3(data,x,y,w,h) :
dt11 = rdd(data,x-1,y-1,w,h)
dt12 = rdd(data,x+0,y-1,w,h)
dt13 = rdd(data,x+1,y-1,w,h)
dt21 = rdd(data,x-1,y+0,w,h)
dt22 = rdd(data,x+0,y+0,w,h)
dt23 = rdd(data,x+1,y+0,w,h)
dt31 = rdd(data,x-1,y+1,w,h)
dt32 = rdd(data,x+0,y+1,w,h)
dt33 = rdd(data,x+1,y+1,w,h)
alp = 0xFF
if x%2==0 and y%2==0 :
red = dt22
grn = ((0x0000FFFF & dt12 ) + dt21 + dt23 + dt32)//4
blu = ((0x0000FFFF & dt11 ) + dt13 + dt31 + dt33)//4
if x%2==0 and y%2==1 :
red = ((0x0000FFFF & dt12 ) + dt32)//2
grn = dt22
blu = ((0x0000FFFF & dt21 ) + dt23)//2
if x%2==1 and y%2==0 :
red = ((0x0000FFFF & dt21 ) + dt23)//2
grn = dt22
blu = ((0x0000FFFF & dt12 ) + dt32)//2
if x%2==1 and y%2==1 :
red = ((0x0000FFFF & dt11 ) + dt13 + dt31 + dt33)//4
blu = dt22
grn = ((0x0000FFFF & dt12 ) + dt21 + dt23 + dt32)//4
return (alp,red,grn,blu)
def conv16to64RGGB3x3(data,w,h) :
buffer = []
for y in range(0,h) :
for x in range(0,w) :
RGBA = RGGB3x3(data,x,y,w,h)
buffer.append(RGBA[0])
buffer.append(RGBA[1])
buffer.append(RGBA[2])
buffer.append(RGBA[3])
return buffer
def shift_max(data) :
buffer = []
pw = max(data)
dpos = 0
for sf in range(0,8) :
if pw<256 :
break
pw = pw >> 1
for i in range(len(data)//4) :
alp = data[dpos]
dpos = dpos + 1
red = data[dpos]>>sf
dpos = dpos + 1
grn = data[dpos]>>sf
dpos = dpos + 1
blu = data[dpos]>>sf
dpos = dpos + 1
buffer.append((red,grn,blu,alp))
return buffer
def div_max(data) :
buffer = []
pw = max(data)
if pw<255 :
pw = 255
dpos = 0
for i in range(len(data)//4) :
alp = data[dpos]
dpos = dpos + 1
red = int(float(data[dpos])/pw*0x00FF)
dpos = dpos + 1
grn = int(float(data[dpos])/pw*0x00FF)
dpos = dpos + 1
blu = int(float(data[dpos])/pw*0x00FF)
dpos = dpos + 1
buffer.append((red,grn,blu,alp))
return buffer
def cut_max(data) :
buffer = []
dpos = 0
for i in range(len(data)//4) :
alp = data[dpos]
dpos = dpos + 1
red = min([data[dpos],0x00FF])
dpos = dpos + 1
grn = min([data[dpos],0x00FF])
dpos = dpos + 1
blu = min([data[dpos],0x00FF])
dpos = dpos + 1
buffer.append((red,grn,blu,alp))
return buffer
# VALUE CONVERT
def value4(lb) :
return (((lb[0]*256 + lb[1])*256 + lb[2])*256 + lb[3])
def bytes4(val) :
b0 = val % 256
val = val // 256
b1 = val % 256
val = val // 256
b2 = val % 256
val = val // 256
b3 = val
return bytes([b3,b2,b1,b0])
def bytes1(val) :
return bytes([val])
magic = 0xEDB88320
# CRC CHECK
def calc_crc0(crc, d, magic) :
for i in range(8) :
if ((d >> i) & 1) :
crc = crc ^ 1
b = (crc & 1)
crc = crc >> 1
if b :
crc = crc ^ magic
return crc
def crc_calc(crc, buff, magic) :
for n in range(len(buff)) :
crc = calc_crc0(crc,buff[n],magic)
return crc
def change_val(st,val) :
keyin = input(f"{st} : {val} = ")
if len(keyin) == 0 :
keyin = str(val)
return keyin
# MAIN
print(f"*** PNG16-GRAY to TRUE-COLOR CONVERTER VERSION {ver} ***")
print("\nSELECT PNG16 GRAY SCALE FILE\n")
while len( fnm := input("file : ") ) > 0 :
try :
f = open(fnm,'rb')
assert(f.read(1)== b'\x89' )
assert(f.read(3)== b'PNG' )
assert(f.read(2)== b'\x0d\x0a')
assert(f.read(2)== b'\x1a\x0a')
print("PNG FORMAT ACCEPTED...")
except FileNotFoundError:
print("FILE NOT FOUND !")
except AssertionError:
print("TYPE ERROR !")
f.close()
else :
try :
lb = f.read(4)
ln = value4(lb)
assert(ln == 13)
assert(f.read(4) == b'IHDR')
wb = f.read(4)
hb = f.read(4)
bb = f.read(1)
cb = f.read(1)
pb = f.read(1)
yet = f.read(2)
crc = f.read(4)
width = (((wb[0]*256 + wb[1])*256 + wb[2])*256 + wb[3])
height = (((hb[0]*256 + hb[1])*256 + hb[2])*256 + hb[3])
bit = bb[0]*1
col = cb[0]*1
cmp = pb[0]*1
print("W:",width,"H:",height)
print("B:",bit,"C:",col,"P:",cmp)
if col>0 :
print("NOT GRAY SCALE !")
assert(False)
if bit != 16 :
print("BIT SIZE ERROR !")
assert(False)
except AssertionError:
print("DATA ERROR !")
f.close()
continue
else :
f.close()
print("*** DEBAYER MODE ***")
print("1: GRAY")
print("2: RGGB 2x2")
print("3: RGGB 3x3")
while True :
dm = int(input("MODE :"))
if 1 <= dm and dm <= 3 :
break
global minval
global maxval
global gnmval
minval = 0
maxval = 0xFFFF
gnmval = 1.0000
print("*** CORRECTION SETTING ***")
while True :
minval = int( change_val("MIN",minval))
maxval = int( change_val("MAX",maxval))
gnmval = float(change_val("GNM",gnmval))
if minval >= maxval :
continue
if gnmval <= 0.0 :
continue
break
print("*** CONVERT MODE ***")
print("1: SHIFT MAX")
print("2: DIV MAX")
print("3: CUT MAX")
mode = 0
while True :
mode = int(input("MODE :"))
if 1 <= mode and mode <= 3 :
break
imagebuffer = imageio.v2.imread(fnm)
print("*** CONVERT FILE ***")
if dm == 1 :
imagebuffer = conv16to64RGGBGRY(imagebuffer,width,height)
if dm == 2 :
imagebuffer = conv16to64RGGB2x2(imagebuffer,width,height)
if dm == 3 :
imagebuffer = conv16to64RGGB3x3(imagebuffer,width,height)
if mode == 1 :
imagebuffer = shift_max(imagebuffer)
if mode == 2 :
imagebuffer = div_max(imagebuffer)
if mode == 3 :
imagebuffer = cut_max(imagebuffer)
img_cv = Image.new('RGBA',(width,height))
for y in range(height) :
for x in range(width) :
img_cv.putpixel((x,y),imagebuffer[width*y+x])
fno = fnm + ".debayer-" + str(dm) + str(mode) + ".png"
print(f"*** WRITE OUT : {fno} ***")
img_cv.save(fno)
print("DONE !")
#END OF FILE