var.video.Chess Class Reference

Inheritance diagram for var.video.Chess:

Collaboration diagram for var.video.Chess:

Public Member Functions
def	__init__ (self, **kw)
def	draw_quads (self, img, quads, color=(0, 255, 0))
def	render (self, dst)
Public Member Functions inherited from var.video.VideoSynthBase
def	__init__ (self, size=None, noise=0.0, bg=None, **params)
def	read (self, dst=None)
def	isOpened (self)

Public Attributes
	grid_size
	white_quads
	black_quads
	K
	dist_coef
	t
	tvec
	rvec
Public Attributes inherited from var.video.VideoSynthBase
	bg
	frame_size
	noise

Detailed Description

Definition at line 140 of file video.py.

Constructor & Destructor Documentation

__init__()

def var.video.Chess.__init__	(		self,
		**	kw
	)

Definition at line 141 of file video.py.

    def __init__(self, **kw):
        super(Chess, self).__init__(**kw)
 
        w, h = self.frame_size
 
        self.grid_size = sx, sy = 10, 7
        white_quads = []
        black_quads = []
        for i, j in np.ndindex(sy, sx):
            q = [[j, i, 0], [j+1, i, 0], [j+1, i+1, 0], [j, i+1, 0]]
            [white_quads, black_quads][(i + j) % 2].append(q)
        self.white_quads = np.float32(white_quads)
        self.black_quads = np.float32(black_quads)
 
        fx = 0.9
        self.K = np.float64([[fx*w, 0, 0.5*(w-1)],
                        [0, fx*w, 0.5*(h-1)],
                        [0.0,0.0,      1.0]])
 
        self.dist_coef = np.float64([-0.2, 0.1, 0, 0])
        self.t = 0
 

Member Function Documentation

draw_quads()

def var.video.Chess.draw_quads	(		self,
			img,
			quads,
			color = (0, 255, 0)
	)

Definition at line 163 of file video.py.

    def draw_quads(self, img, quads, color = (0, 255, 0)):
        img_quads = cv.projectPoints(quads.reshape(-1, 3), self.rvec, self.tvec, self.K, self.dist_coef) [0]
        img_quads.shape = quads.shape[:2] + (2,)
        for q in img_quads:
            cv.fillConvexPoly(img, np.int32(q*4), color, cv.LINE_AA, shift=2)
 

render()

def var.video.Chess.render	(		self,
			dst
	)

Reimplemented from var.video.VideoSynthBase.

Definition at line 169 of file video.py.

    def render(self, dst):
        t = self.t
        self.t += 1.0/30.0
 
        sx, sy = self.grid_size
        center = np.array([0.5*sx, 0.5*sy, 0.0])
        phi = pi/3 + sin(t*3)*pi/8
        c, s = cos(phi), sin(phi)
        ofs = np.array([sin(1.2*t), cos(1.8*t), 0]) * sx * 0.2
        eye_pos = center + np.array([cos(t)*c, sin(t)*c, s]) * 15.0 + ofs
        target_pos = center + ofs
 
        R, self.tvec = common.lookat(eye_pos, target_pos)
        self.rvec = common.mtx2rvec(R)
 
        self.draw_quads(dst, self.white_quads, (245, 245, 245))
        self.draw_quads(dst, self.black_quads, (10, 10, 10))
 
 

Here is the caller graph for this function:

Member Data Documentation

black_quads

var.video.Chess.black_quads

Definition at line 153 of file video.py.

dist_coef

var.video.Chess.dist_coef

Definition at line 160 of file video.py.

grid_size

var.video.Chess.grid_size

Definition at line 146 of file video.py.

K

var.video.Chess.K

Definition at line 156 of file video.py.

rvec

var.video.Chess.rvec

Definition at line 182 of file video.py.

t

var.video.Chess.t

Definition at line 161 of file video.py.

tvec

var.video.Chess.tvec

Definition at line 181 of file video.py.

white_quads

var.video.Chess.white_quads

Definition at line 152 of file video.py.

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The documentation for this class was generated from the following file:

• repos_for_Dox/cFp_Zoo/HOST/vision/common/languages/python/var/video.py