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gen_psf_interferometer_detect_skyim.py
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gen_psf_interferometer_detect_skyim.py
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#! /usr/bin/python
"""
Interferometer/PSF simulator
Created by: Jack Hickish
Minor Modifications by: Griffin Foster
TODO: add color
TODO: adjust detection paramters
TODO: add freeze/unfreeze command
TODO: add rotation command
"""
import cv2 #for ubuntu 12.04 install see: http://karytech.blogspot.com/2012/05/opencv-24-on-ubuntu-1204.html
import cv
import numpy as np
import time
import sys, optparse
def cvfast_conv(image,psf):
max_size = np.array([np.max([image.shape[0],psf.shape[0]]),np.max([image.shape[1],psf.shape[1]])])
n = cv.GetOptimalDFTSize(max_size[0]*2)
m = cv.GetOptimalDFTSize(max_size[1]*2)
imagePad=np.zeros((n,m))
imagePad[:image.shape[0],:image.shape[1]]=image
imageDirty=np.fft.irfft2(np.fft.rfft2(imagePad) * np.fft.rfft2(psf, imagePad.shape))
print image.shape, psf.shape, n,m
return imageDirty[psf.shape[0]/2:image.shape[0]+psf.shape[0]/2,psf.shape[1]/2:image.shape[1]+psf.shape[1]/2]
#return imagePad
def cv2array(im):
depth2dtype = {
cv.IPL_DEPTH_8U: 'uint8',
cv.IPL_DEPTH_8S: 'int8',
cv.IPL_DEPTH_16U: 'uint16',
cv.IPL_DEPTH_16S: 'int16',
cv.IPL_DEPTH_32S: 'int32',
cv.IPL_DEPTH_32F: 'float32',
cv.IPL_DEPTH_64F: 'float64',
}
arrdtype=im.depth
a = np.fromstring(
im.tostring(),
dtype=depth2dtype[im.depth],
count=im.width*im.height*im.nChannels)
a.shape = (im.height,im.width,im.nChannels)
return a
def array2cv(a):
dtype2depth = {
'uint8': cv.IPL_DEPTH_8U,
'int8': cv.IPL_DEPTH_8S,
'uint16': cv.IPL_DEPTH_16U,
'int16': cv.IPL_DEPTH_16S,
'int32': cv.IPL_DEPTH_32S,
'float32': cv.IPL_DEPTH_32F,
'float64': cv.IPL_DEPTH_64F,
}
try:
nChannels = a.shape[2]
except:
nChannels = 1
cv_im = cv.CreateImageHeader((a.shape[1],a.shape[0]),
dtype2depth[str(a.dtype)], nChannels)
cv.SetData(cv_im, a.tostring(),a.dtype.itemsize*nChannels*a.shape[1])
return cv_im
o = optparse.OptionParser()
o.set_usage('%prog [options]')
o.set_description(__doc__)
o.add_option('-i','--input',dest='input', default=None,
help='Input \'sky\' image, Default: HARDCODED')
o.add_option('-c','--camera',dest='camera', default=1, type='int',
help='Camera device ID in /dev/video*, Default: 1')
o.add_option('-r','--res',dest='res', default=4, type='int',
help='Resolution factor, increase this value to decrease the resolution, Default: 4')
opts, args = o.parse_args(sys.argv[1:])
CAMERA_DEVICE_INDEX=opts.camera #check /dev/, ID is attached to video device (0 is in the internal)
cv.NamedWindow("Antenna Layout", cv.CV_WINDOW_AUTOSIZE)
cv.NamedWindow("Target Image", cv.CV_WINDOW_AUTOSIZE)
cv.NamedWindow("Point Spread", cv.CV_WINDOW_AUTOSIZE)
cv.NamedWindow("Observed Image", cv.CV_WINDOW_AUTOSIZE)
cam0 = cv.CaptureFromCAM(CAMERA_DEVICE_INDEX)
if opts.input is None:
target_image = cv2.imread('/home/griffin/Downloads/interactiveInterferometer/astro_test_image.jpg')
else:
target_image=cv2.imread(opts.input)
target_img_grey = cv2.cvtColor(target_image,cv2.cv.CV_BGR2GRAY)
target_img_lying = target_img_grey.copy()
#saturated image
target_img_grey[target_img_grey>100] = 255
target_img_grey[target_img_grey<255] = 0
RESCALE_FACTOR=opts.res #decrease to change the effective resolution
ysize=480
xsize=640
#make a 2D Gaussian to modulate the PSF with
def gauss2d(x0,y0,amp,stdx,stdy):
return lambda x,y: amp*np.exp(-1.*( (((x-x0)**2.)/(2*stdx**2.)) + (((y-y0)**2.)/(2*stdy**2.)) ))
gaussFunc=gauss2d(0.,0.,1.,30.,30.)
xx = np.arange(xsize)-(xsize/2)
yy = np.arange(ysize)-(ysize/2)
xv, yv = np.meshgrid(xx, yy)
gaussGrid=gaussFunc(xv,yv)
while(True):
layout_img = cv.QueryFrame(cam0)
layout_img_grey = cv.CreateImage((layout_img.width,layout_img.height),layout_img.depth,1)
cv.CvtColor(layout_img,layout_img_grey,cv.CV_BGR2GRAY)
layout_img_grey_arr = cv2array(layout_img_grey)
station_locs = np.zeros([ysize/RESCALE_FACTOR,xsize/RESCALE_FACTOR])
#cv2.HoughCircles(image, method, dp, minDist, circles, param1, param2, minRadius, maxRadius)
# image: input webcam image size
# method: only cv.CV_HOUGH_GRADIENT exists
# dp: Inverse ratio of the accumulator resolution to the image resolution. this basically affects the min/max radius
# minDist: Minimum distance between the centers of the detected circles. If the parameter is too small, multiple neighbor circles may be falsely detected in addition to a true one. If it is too large, some circles may be missed.
# circles: set to None
# param1: threshold parameter
# param2: The smaller it is, the more false circles may be detected.
# minRadius: Minimum circle radius
# maxRadius: Maximum circle radius
circles = cv2.HoughCircles(layout_img_grey_arr, cv.CV_HOUGH_GRADIENT,2,10,None,100,35,5,30)
if circles is not None:
for cn,circle in enumerate(circles[0]):
x,y = circle[1],circle[0]
print "we have circle at %d,%d"%(x,y)
try:
layout_img_grey_arr[x-5:x+5,y-5:y+5]=255
except:
pass
station_locs[x/RESCALE_FACTOR,y/RESCALE_FACTOR]=1
psf = np.fft.fftshift(np.abs(np.fft.fft2(station_locs,s=[ysize,xsize]))**2)
#psf=psf[(ysize/2)-64:(ysize/2)+64,(xsize/2)-64:(xsize/2)+64] #only select the central region of the PSF
psf /= psf.max()
psf=psf*gaussGrid #apply a Gaussian taper to the PSF
psf_img = array2cv(psf)
#target_arr = target_img_grey[:,:]
#dirty_arr = cvfast_conv(target_arr,psf)
dirty_arr = cvfast_conv(target_img_lying,psf)
dirty_arr /= dirty_arr.max()
dirty_img = array2cv(dirty_arr)
cv.ShowImage("Antenna Layout",array2cv(layout_img_grey_arr))
cv.ShowImage("Target Image",array2cv(target_img_lying))
cv.ShowImage("Point Spread",psf_img)
cv.ShowImage("Observed Image",dirty_img)
if cv.WaitKey(50)!=-1:
break
cv.DestroyAllWindows()