You may find example of reading histograms in http://elphel.cvs.sourceforge.net/viewvc/elphel/elphel353-8.0/packages/web/353/php_top/diag_utils.php?view=markup(lines 425 and below)
It is available in the camera as http://camera_ip/diag_utils.php (linked from the main page) Andrey On Wed, Mar 23, 2011 at 10:40 AM, Andrey Filippov < [email protected]> wrote: > Sebastien, Sebastian > > 1) Monochrome images - you may set monochrome mode (selection list in camvc > or COLOR=0 in parsedit.pho or just from the PHP script. > It will still appear as "color JPEG", but color components will be zeroed > completely so compressed nicely. > 2) "Raw" - I would still recommend using JPEG with quality=100%. The > compression error will be less than 1 count, but you'll get the normal fps - > real raw data from the camera is made fro debugging mostly, it requires each > pixel to be read from the FPGA by software - in compressed mode data is > transferred to the system memory over DMA > 3) Using camvc.php to control the camera - yes, it is possible but I would > recommend using custom php script (you may use snapfull.php as an example) > 4) Histograms - you may use PHP code to read histogram arrays from the > camera, there is support in the PHP extension: > > http://elphel.cvs.sourceforge.net/viewvc/elphel/elphel353-8.0/apps/php-5.2.9/ext/elphel/elphel_php.c?view=markup: > > 1245 /** 1246 * @brief return histograms for selected frame (absolute > frame number) as a plain integer array 1247 * some derivative histograms > may be calculated if they do not exist yet 1248 * (raw FPGA data should > be read from IRQ/tasklet - no attemt to re-read FPGA here) 1249 * @param > frame - absolute frame number 1250 * @param needed - bitmask specifying > what tables to include in the output array, each group is in the order > r(0),g(1),gb(2),b(3) 1251 * - bits 0..3 - raw histograms from the FPGA > (only if they are already in the cache) 1252 * - bits 4..7 - cumulative > histograms (sum of raw ones) - normally called from applications 1253 * - > bits 8..11 - calculate percentiles (reverse cumulative histograms) - > normally called from applications 1254 * @return NULL - error, otherwise > a string with (struct histogram_stuct_t) 1255 * 1256 */ 1257 > 1258 PHP_FUNCTION(elphel_histogram_get) 1259 { 1260 struct > histogram_stuct_t * frame_histogram_structure; 1261 long frame=-1; 1262 > long needed=0xfff; 1263 long index; 1264 int i; 1265 if ( > zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|ll", &needed, &frame) > == FAILURE) { 1266 php_error_docref(NULL TSRMLS_CC, E_ERROR, "Wrong > index"); 1267 RETURN_NULL (); 1268 } > (all php functions are listed in the beginning of the file) > > For each function format is specified in a line like > if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|ll", &needed, & > frame) == FAILURE) { > > "|ll" means that there are no required parameters (nothing before "|"), so > you can call > $histogram=elphel_histogram_get(); > > and two optional long parameters that will be assigned to "needed" and > "frame" variables > > Note, there is no automatic conversion of the parameter types, they should > be numbers, not string. You may ensure that the strings are converted by > adding 0 to them, i.e > $numeric_value=$_GET('url_value')+0; > to convert url parameter (...&url_value=1234&..) to integer value 1234 > > Andrey > > > >
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