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Date:      Sun, 15 Feb 1998 01:22:21 -0300 (EST)
From:      Joao Carlos Mendes Luis <jonny@coppe.ufrj.br>
To:        multimedia@FreeBSD.ORG
Subject:   Two single snaps on bt848
Message-ID:  <199802150422.BAA17937@gaia.coppe.ufrj.br>

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[-- Attachment #1 --]
Hi,

  I have some problems enhancing a program I already have done to capture
static frames from bt848.

  The first version capture one single frame with
  
    ioctl( fd, METEORCAPTUR, &METEOR_CAP_SINGLE );

  and works perfectly.  Now I'm trying to enhance a little, and need to
take a second snap from the same device.

  My program is based on the probability that the next image will be
very similar to the first.  And it is, in the current testbed.  The
camera is in another room, static.

  But the second snap is completly different from the first.  It is more
bright, and seems to have more noise.  I'm attaching two small jpg's of
it.  Two images are better than two thousand words.  :)

  I may send the sources on request (I'm intending to make a port of it
someday), but the algorithm is simple:

  - open devices and setup properties (bright, contrast, size, etc)
  - capture single frame
  - save
  - capture single frame
  - save
  - close all

  Closing and reopening the devices made no difference at all.  Running
a single snap program repeatedly behaves as I expect.

  Any clue ?

					Jonny

--
Joao Carlos Mendes Luis			jonny@gta.ufrj.br
+55 21 290-4698				jonny@coppe.ufrj.br
Universidade Federal do Rio de Janeiro	UFRJ/COPPE/CISI
PGP fingerprint: 29 C0 50 B9 B6 3E 58 F2  83 5F E3 26 BF 0F EA 67

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