jimmyhhua/opencv_tutorials

Opencv4.0 with python (English&中文)， and will keep the update ! 👊

opencv_tutorials's Issues

opencv4.0中sift问题

想知道楼主怎么解决的sift等算法在一些opencv高版本中无法使用的问题

“gray = cv2.cv2tColor(src, cv2.COLOR_BGR2GRAY)”代码有误

应为‘’‘gray = cv2.cvtColor(src, cv2.COLOR_BGR2GRAY)’’‘

关于hog问题

我在opencv官方文档里面找到的代码是

def hog(img):
    gx = cv.Sobel(img, cv.CV_32F, 1, 0)
    gy = cv.Sobel(img, cv.CV_32F, 0, 1)
    mag, ang = cv.cartToPolar(gx, gy)
    bins = np.int32(bin_n*ang/(2*np.pi))    # quantizing binvalues in (0...16)
    bin_cells = bins[:10,:10], bins[10:,:10], bins[:10,10:], bins[10:,10:]
    mag_cells = mag[:10,:10], mag[10:,:10], mag[:10,10:], mag[10:,10:]
    hists = [np.bincount(b.ravel(), m.ravel(), bin_n) for b, m in zip(bin_cells, mag_cells)]
    hist = np.hstack(hists)     # hist is a 64 bit vector
    return hist

deskewed = [list(map(deskew,row)) for row in train_cells]
hogdata = [list(map(hog,row)) for row in deskewed]
trainData = np.float32(hogdata).reshape(-1,64)
responses = np.repeat(np.arange(10),250)[:,np.newaxis]

opencv_tutorials/python/code_104/opencv_104.py

Lines 6 to 18 in d1dacf7

	def get_hog_descriptor(image):
	hog = cv.HOGDescriptor()
	h, w = image.shape[:2]
	rate = 64 / w
	image = cv.resize(image, (64, np.int(rate*h)))
	gray = cv.cvtColor(image, cv.COLOR_BGR2GRAY)
	bg = np.zeros((128, 64), dtype=np.uint8)
	bg[:,:] = 127
	h, w = gray.shape
	dy = (128 - h) // 2
	bg[dy:h+dy,:] = gray
	fv = hog.compute(bg, winStride=(8, 8), padding=(0, 0))
	return fv

这两个有什么区别吗？

Code012 lost file

The code012 lost the "test.avi" file

Is there any assistance needed ?

Hi everyone,
I would love to contribute to this project, however I am not sure if maintainers are still active here ... 🤔
Would appreciate your answer.

是否可以提供对应cpp tutorials

如题