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gk2a_proc.py
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gk2a_proc.py
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from PIL import Image
import sys
import os
# Jet color scheme adapted from https://stackoverflow.com/questions/7706339/grayscale-to-red-green-blue-matlab-jet-color-scale
def interpolate( val, y0, x0, y1, x1 ):
return (val-x0)*(y1-y0)/(x1-x0) + y0
def blue( grayscale ):
if ( grayscale < -0.33 ): return 1.0
elif ( grayscale < 0.33 ): return interpolate( grayscale, 1.0, -0.33, 0.0, 0.33 );
else: return 0.0
def green( grayscale ):
if ( grayscale < -1.0 ): return 0.0
if ( grayscale < -0.33 ): return interpolate( grayscale, 0.0, -1.0, 1.0, -0.33 );
elif ( grayscale < 0.33 ): return 1.0
elif ( grayscale <= 1.0 ): return interpolate( grayscale, 1.0, 0.33, 0.0, 1.0 );
else: return 1.0
def red( grayscale ):
if ( grayscale < -0.33 ):
return 0.0
elif ( grayscale < 0.33 ):
return interpolate( grayscale, 0.0, -0.33, 1.0, 0.33 )
else:
return 1.0
def rain_fall(ir):
apply = Image.new("RGB", ir.size)
apply.paste(ir)
for x in range(0,ir.width):
for y in range(0,ir.height):
min_thermal = 200
value = ir.getpixel((x,y))
if type(value)==int:
grey_scale = value
else:
grey_scale = int((float(value[0])+float(value[1])+float(value[2]))/3.0)
if(grey_scale > min_thermal):
v = (grey_scale-min_thermal)/(255-min_thermal)
apply.putpixel((x,y),(int(red((v-0.5)*2)*255),int(green((v-0.5)*2)*255),int(blue((v-0.5)*2)*255)))
return apply
def thermal(ir):
apply = Image.new("RGB", ir.size)
for x in range(0,ir.width):
for y in range(0,ir.height):
value = ir.getpixel((x,y))/255
r = int(red((value-0.5)*2)*255)
g = int(green((value-0.5)*2)*255)
b = int(blue((value-0.5)*2)*255)
apply.putpixel((x,y),(r,g,b))
return apply
def gk2a_proc(ir):
return (thermal(ir),rain_fall(ir))
def main():
if(len(sys.argv) < 3):
print("Usage: ./gk2a_proc.py <input> <output directory>")
exit(-1)
input_image = sys.argv[1]
output_directory = sys.argv[2]
if not os.path.isdir(output_directory):
os.mkdir(output_directory)
therm, rain = gk2a_proc(Image.open(input_image))
therm.save(output_directory+"/thermal.png")
rain.save(output_directory+"/rainfall.png")
if __name__ == "__main__":
main()