Re: [libdc] convert libdc1394video_frame_t to IplImage or SDL_image
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Re: [libdc] convert libdc1394video_frame_t to IplImage or SDL_image
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From: Jean F. <jea...@go...> - 2008-10-05 09:21:14
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-------- Original Message --------<br>
Subject: Re:[libdc] convert libdc1394video_frame_t to IplImage or
SDL_image<br>
From: Jeremy Leibs <a class="moz-txt-link-rfc2396E" href="mailto:le...@wi..."><le...@wi...></a><br>
To: libdc1394-devel <a class="moz-txt-link-rfc2396E" href="mailto:lib...@li..."><lib...@li...></a><br>
Date: 5.10.2008 2:13 Uhr<br>
<blockquote cite="mid:48E...@wi..." type="cite">
<pre wrap="">Paulo Freitas wrote:
</pre>
<blockquote type="cite">
<pre wrap="">So my plan is to convert the dc1394video_frame_t structure to the
IplImage structure of the OpenCV or maybe to a SDL_image structure,
if is possible. Anyone know how to do this? With this conversion
should be easy to show the images by the OpenCV or SDL.
</pre>
</blockquote>
<pre wrap=""><!---->
Paulo, I have been using libdc1394 with opencv with a fair amount of
success recently. The following is a code snippet I have used to take a
dc1394video_frame_t* and pass it into an opencv algorithm.
IplImage* cv_img = cvCreateImageHeader(
cvSize(dc_frame->size[0], dc_frame>size[1]), IPL_DEPTH_8U,
1);
cv_img->imageData = (char*)(dc_frame->image);
cv_img->imageSize = dc_frame->image_bytes;
I am certain that this will not work in all circumstances, in
particular if strange things happen with padding bytes, etc.
However, for the images I have been dealing with it was certainly
sufficient to get the job done. Just be careful in your assumptions
about how portable the code will be.
Hope this helps,
--Jeremy Leibs
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</pre>
</blockquote>
Hi Paulo,<br>
<br>
Else you could try this snipplet - for b/w and color images.<br>
<br>
Regards,<br>
Jean First<br>
<br>
<br>
<tt>dc1394camera_t *cameras[2];<br>
dc1394video_frame_t *frames[2];<br>
IplImage *original_eye_image=NULL;<br>
IplImage *scene_image=NULL;<br>
<br>
#ifndef YUV2RGB<br>
#define YUV2RGB(y, u, v, r, g, b)\<br>
r = y + ((v*1436) >> 10);\<br>
g = y - ((u*352 + v*731) >> 10);\<br>
b = y + ((u*1814) >> 10);\<br>
r = r < 0 ? 0 : r;\<br>
g = g < 0 ? 0 : g;\<br>
b = b < 0 ? 0 : b;\<br>
r = r > 255 ? 255 : r;\<br>
g = g > 255 ? 255 : g;\<br>
b = b > 255 ? 255 : b<br>
#endif<br>
<br>
void uyyvyy2rgb (unsigned char *src, unsigned char *dest, unsigned long
long int NumPixels)<br>
{<br>
register int i = NumPixels + ( NumPixels >> 1 )-1;<br>
register int j = NumPixels + ( NumPixels << 1 )-1;<br>
register int y0, y1, y2, y3, u, v;<br>
register int r, g, b;<br>
<br>
while (i > 0) {<br>
y3 = (unsigned char) src[i--];<br>
y2 = (unsigned char) src[i--];<br>
v = (unsigned char) src[i--] - 128;<br>
y1 = (unsigned char) src[i--];<br>
y0 = (unsigned char) src[i--];<br>
u = (unsigned char) src[i--] - 128;<br>
YUV2RGB (y3, u, v, r, g, b);<br>
dest[j--] = r;<br>
dest[j--] = g;<br>
dest[j--] = b;<br>
YUV2RGB (y2, u, v, r, g, b);<br>
dest[j--] = r;<br>
dest[j--] = g;<br>
dest[j--] = b;<br>
YUV2RGB (y1, u, v, r, g, b);<br>
dest[j--] = r;<br>
dest[j--] = g;<br>
dest[j--] = b;<br>
YUV2RGB (y0, u, v, r, g, b);<br>
dest[j--] = r;<br>
dest[j--] = g;<br>
dest[j--] = b;<br>
}<br>
}<br>
<br>
# capture from a b/w and a color camera<br>
for (i=0; i<2; i++) {<br>
if (dc1394_capture_dequeue(cameras[i], DC1394_CAPTURE_POLICY_POLL,
&frames[i])!=DC1394_SUCCESS){<br>
dc1394_log_error("Failed to capture from camera %d", i);<br>
}<br>
}<br>
<br>
# copy b/w image to IplImage<br>
memcpy(eye_image->imageData, (char *)frames[0]->image, 640*480);<br>
# copy color image to IplImage<br>
uyyvyy2rgb((unsigned char *)frames[1]->image, (unsigned char
*)scene_image->imageData, 640*480);</tt><br>
<br>
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