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grabber: add new ROI engine (untested)

This commit is contained in:
Sebastien Bourdeauducq 2018-07-10 17:06:17 +08:00
parent d82beee540
commit f8ceea20d0
1 changed files with 60 additions and 0 deletions

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@ -77,3 +77,63 @@ class Parser(Module, AutoCSR):
MultiReg(last_x, self.last_x.status),
MultiReg(last_y, self.last_y.status)
]
class ROI(Module):
"""ROI Engine. For each frame, accumulates pixels values within a
rectangular region of interest, and reports the total."""
def __init__(self, pix, shift=0):
cnt_len = len(pix.x) + len(pix.y) + 16 - shift
self.cfg = cfg = Record([
("x0", len(pix.x)),
("x1", len(pix.x)),
("y0", len(pix.y)),
("y1", len(pix.y)),
])
self.out = out = Record([
("update", 1),
# register output - can be used as CDC input
("cnt", cnt_len),
])
# # #
# stage 1 - generate "good" (in-ROI) signals
y_good = Signal()
x_good = Signal()
stb = Signal()
eop = Signal()
gray = Signal(16)
self.sync.cl += [
If(pix.y == cfg.y0,
y_good.eq(1)
),
If(pix.y == cfg.y1,
y_good.eq(0)
),
If(pix.x == cfg.x0,
x_good.eq(1)
),
If(pix.x == cfg.x1,
x_good.eq(0)
),
gray.eq(Cat(pix.a, pix.b)[shift:]),
stb.eq(pix.stb),
eop.eq(pix.eop)
]
# stage 2 - accumulate
cnt = Signal(cnt_len)
self.sync.cl += [
If(stb & x_good & y_good,
cnt.eq(cnt + gray),
),
out.update.eq(0),
If(eop,
cnt.eq(0),
out.update.eq(1),
out.cnt.eq(cnt)
)
]