Ain't got no problem getting the list of numbers from the rightmost outlet, but don't really understand what each one of those stands for: centerX(weighted), centerY(weighted), size(weighted), minX, minY, maxX, maxY, area. I know [pix_multiblob] makes a matrix to get the results, but I don't know how does that work neither.
Kinda naïve I guess, but ain't got no clue. Any help would be appreciated.
thanks, Eduardo
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On 2011-09-25 16:19, Eduardo Rosario wrote:
Ain't got no problem getting the list of numbers from the rightmost outlet, but don't really understand what each one of those stands for: centerX(weighted), centerY(weighted), size(weighted), minX, minY, maxX, maxY, area.
what exactly is it that you don't understand?
the "weighted" elements take the luminance of the blobs and interpret them as 'mass': this mans, the brighter a pixel in the blob gets, the more important it is. "centerX(weighted)" is the X coordinate of the centre of gravity, "size(weighted)" is he total 'weight' of the blob,
the 'unweighted' elements, are mere 2D geometric properties, "minY" is the minimum Y coordinate of the blob, and "area" is a (normalized) count of all pixels covered by a blob.
I know [pix_multiblob] makes a matrix to get the results, but I don't know how does that work neither.
a matrix is a 2D array of N*M elements to store numbers. N is the number of rows in the array, in our case the number of detected blobs. M is the number of columns in the array, in our case 8 (centerX(weighted)...area)
the iemmatrix library deals with these arrays (if you don't want to parse the simple message yourself)
fgmasdr IOhannes
Le 2011-09-25 à 10:19:00, Eduardo Rosario a écrit :
Ain't got no problem getting the list of numbers from the rightmost outlet, but don't really understand what each one of those stands for: size(weighted),
Sum of all pixel values.
centerX(weighted), centerY(weighted),
you take the sum of all products of pixel values with x positions, and then you divide by the weighted size. This gives you a value in pixel units, which is an average horiz position.
likewise for y.
minX, minY, maxX, maxY, area. I know [pix_multiblob] makes a matrix to get the results, but I don't know how does that work neither.
Use [list split 8] and [unpack f f f f f f f f], either several copies or recursively.
Or use GridFlow or iemmatrix.
| Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC
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Eduardo Rosario -
IOhannes m zmoelnig -
Mathieu Bouchard