matlab - Perspective projection of a 3D model to a 2D plane -


i'm trying project 3d model 2d plane , found should use projection equation c*((r*x)+t) so. c, camera calibration matrix calculated follows: 

c =[f 0 px;     0 f py;     0 0 1];

first, want ask focal length f used in camera calibration matrix. should use value in pixels or mm? if in mm how can it?

second don't know px , py variables stand got information data i'm working on bye exifread function in matlab , these information got: 

              sharpness: 0                contrast: 0        scenecapturetype: 0   focallengthin35mmfilm: 27        digitalzoomratio: 1            whitebalance: 0            exposuremode: 0               scenetype: 1              filesource: 3           sensingmethod: 2         pixelydimension: 3000         pixelxdimension: 4000              colorspace: 1         flashpixversion: '0100'             focallength: 4.9000                   flash: 1             lightsource: 0            meteringmode: 4        maxaperturevalue: 3.6150       exposurebiasvalue: 0           aperturevalue: 3.6150       shutterspeedvalue: 2.3220  compressedbitsperpixel: 2.8149 componentsconfiguration: [1 2 3 0]       datetimedigitized: '2011:06:26 16:55:08'        datetimeoriginal: '2011:06:26 16:55:08'             exifversion: '0221'         isospeedratings: 100         exposureprogram: 2                 fnumber: 3.5000            exposuretime: 0.2000               copyright: 'copyright 2010'        ycbcrpositioning: 2                datetime: '2011:06:26 16:55:08'                software: '  0.8913'          resolutionunit: 2             yresolution: 96             xresolution: 96             orientation: 1                   model: 'samsung es30/vluu es30'                    make: 'samsung'               thumbnail: [1x1 struct]

do px , py refer of them?

px , py coordinates of principal point. on ideal camera center of image, can use width/2, height/2 start. actual values should use calibration algorithm.

f should in pixels.


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