本文整理匯總了Python中cv2.DFT_SCALE屬性的典型用法代碼示例。如果您正苦於以下問題：Python cv2.DFT_SCALE屬性的具體用法？Python cv2.DFT_SCALE怎麽用？Python cv2.DFT_SCALE使用的例子？那麽, 這裏精選的屬性代碼示例或許可以為您提供幫助。您也可以進一步了解該屬性所在類cv2的用法示例。
在下文中一共展示了cv2.DFT_SCALE屬性的8個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: update
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def update(_):
ang = np.deg2rad( cv2.getTrackbarPos('angle', win) )
d = cv2.getTrackbarPos('d', win)
noise = 10**(-0.1*cv2.getTrackbarPos('SNR (db)', win))
if defocus:
psf = defocus_kernel(d)
else:
psf = motion_kernel(ang, d)
cv2.imshow('psf', psf)
psf /= psf.sum()
psf_pad = np.zeros_like(img)
kh, kw = psf.shape
psf_pad[:kh, :kw] = psf
PSF = cv2.dft(psf_pad, flags=cv2.DFT_COMPLEX_OUTPUT, nonzeroRows = kh)
PSF2 = (PSF**2).sum(-1)
iPSF = PSF / (PSF2 + noise)[...,np.newaxis]
RES = cv2.mulSpectrums(IMG, iPSF, 0)
res = cv2.idft(RES, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT )
res = np.roll(res, -kh//2, 0)
res = np.roll(res, -kw//2, 1)
cv2.imshow(win, res) 示例2: state_vis
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def state_vis(self):
f = cv2.idft(self.H, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT )
h, w = f.shape
f = np.roll(f, -h//2, 0)
f = np.roll(f, -w//2, 1)
kernel = np.uint8( (f-f.min()) / f.ptp()*255 )
resp = self.last_resp
resp = np.uint8(np.clip(resp/resp.max(), 0, 1)*255)
vis = np.hstack([self.last_img, kernel, resp])
return vis 示例3: correlate
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def correlate(self, img):
C = cv2.mulSpectrums(cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT), self.H, 0, conjB=True)
resp = cv2.idft(C, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
h, w = resp.shape
_, mval, _, (mx, my) = cv2.minMaxLoc(resp)
side_resp = resp.copy()
cv2.rectangle(side_resp, (mx-5, my-5), (mx+5, my+5), 0, -1)
smean, sstd = side_resp.mean(), side_resp.std()
psr = (mval-smean) / (sstd+eps)
return resp, (mx-w//2, my-h//2), psr 示例4: fftd
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def fftd(img, backwards=False, byRow=False):
# shape of img can be (m,n), (m,n,1) or (m,n,2)
# in my test, fft provided by numpy and scipy are slower than cv2.dft
# return cv2.dft(np.float32(img), flags=((cv2.DFT_INVERSE | cv2.DFT_SCALE) if backwards else cv2.DFT_COMPLEX_OUTPUT)) # 'flags =' is necessary!
# DFT_INVERSE: 用一維或二維逆變換取代默認的正向變換,
# DFT_SCALE: 縮放比例標識符，根據數據元素個數平均求出其縮放結果，如有N個元素，則輸出結果以1/N縮放輸出，常與DFT_INVERSE搭配使用。
# DFT_COMPLEX_OUTPUT: 對一維或二維的實數數組進行正向變換，這樣的結果雖然是複數陣列，但擁有複數的共軛對稱性
if byRow:
return cv2.dft(np.float32(img), flags=(cv2.DFT_ROWS | cv2.DFT_COMPLEX_OUTPUT))
else:
return cv2.dft(np.float32(img), flags=((cv2.DFT_INVERSE | cv2.DFT_SCALE) if backwards else cv2.DFT_COMPLEX_OUTPUT))
# 實部圖像 示例5: ifft2
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def ifft2(img):
img = np.float32(img)
if img.ndim == 3:
out = cv2.dft(img, flags=cv2.DFT_INVERSE | cv2.DFT_SCALE)
elif img.ndim == 4:
out = []
for c in range(img.shape[2]):
out.append(cv2.dft(
img[:, :, c, :], flags=cv2.DFT_INVERSE | cv2.DFT_SCALE))
else:
raise Exception('only supports 3 or 4 dimensional array')
return out 示例6: ifft1
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def ifft1(img):
img = np.float32(img)
if img.ndim == 2:
img = img[np.newaxis, :, :]
out = cv2.dft(img, flags=cv2.DFT_ROWS | cv2.DFT_SCALE)
out = out.squeeze(0)
elif img.ndim == 3:
out = cv2.dft(img, flags=cv2.DFT_ROWS | cv2.DFT_SCALE)
else:
raise Exception('only supports 2 or 3 dimensional array')
return out 示例7: _linear_correlation
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def _linear_correlation(self, img):
C = cv2.mulSpectrums(
cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT), self.H, 0, conjB=True)
resp = cv2.idft(C, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
h, w = resp.shape
_, mval, _, (mx, my) = cv2.minMaxLoc(resp)
side_resp = resp.copy()
cv2.rectangle(side_resp, (mx - 5, my - 5), (mx + 5, my + 5), 0, -1)
smean, sstd = side_resp.mean(), side_resp.std()
psr = (mval - smean) / (sstd + self.cfg.eps)
return resp, (mx - w // 2, my - h // 2), psr 示例8: fftd
# 需要導入模塊: import cv2 [as 別名]
# 或者: from cv2 import DFT_SCALE [as 別名]
def fftd(img, backwards=False):
# shape of img can be (m,n), (m,n,1) or (m,n,2)
# in my test, fft provided by numpy and scipy are slower than cv2.dft
return cv2.dft(np.float32(img), flags = ((cv2.DFT_INVERSE | cv2.DFT_SCALE) if backwards else cv2.DFT_COMPLEX_OUTPUT)) # 'flags =' is necessary!