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Photo |
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Photo |
Overview
A Photo contains an "Image_uch" object, which in turn contains a Matrix_uch object. At the beginning, when a photo object is created, the x y coordinate of the lower left corner of the Image_uch, a member data of the photo, normally is set to (0,0) while the coordinate of the upper right corner is, says (520.000, 625.000) if no of columns = 520 and no of rows = 625. However, they can be different, for example when a portion of a photo is windowed out from the original photo. In this case the corner coordinates will carry the same coordinates as if they are in the original image. By this technique, any photo derived from the same photo, e.g. using window, skip etc., will have a same set of IO parameters.
Another important member data is a "Camera" object, in which essential information for interior orientation is kept. Moreover it has parameters to transform between image rectangular coordinate and photo coordinates, as well as between photo coordinate and ground coordinate, back and forth.
There are also three flags in a photo object, which will control whether corrections of the lens distortion, the earth curvature and the atmospheric correction be taken into consideration. Only the lens distortion correction is required to have, if any, others are computed by built-in models in Noobeed.
A photo object has its own save function, so that all member data are stored and be recalled anytime the photo is loaded. The brightness data value is store in a binary file, with a default extenstion of ".raw", while the documentation is stored in an ASCII file file, with a default extension ".txt". By this technique, the user can always understand information of a photo, and he can even modify it at will.
Member data
| Name | Data type | Meaning |
| id | int | ID of photo |
| name | String | name of photo |
| Image | Image_uch | a Image_uch object |
| camera | Camera | a Camera object |
| IO_para12 | Vector | a vector contains parameters to convert from image rectangular coordinate to photo coordinate |
| IO_para21 | Vector | a vector contains parameters to convert from photo coordinate to image rectangular coordinate |
| EO_para | Vector | a vector contains exterior orientation parameters of a photo |
| numscale | double | an approximate scale number of a photo |
| flag_rdd | bool | flag controls computaion of radial lens distortion |
| flag_earth | bool | flag controls computation of earth curvature correction |
| flag_refract | bool | flag controls computation of atmospheric correction |
Operator
no operator provided
Construction function
{Photo} ret = PHOTO([{int} argm1, {int} argm2])
argm1 = no of row (default = 0)
argm2 = no of column (default = 0)
Example:
| ->Ph1 = Photo() | an empty photo, with a default camera. |
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->Ph1 = Photo(100,200) |
an image with 100 rows and 200 columns, with a default camera. |
Lfunction
object({int} argm1, {int} argm2) = {uchar} left-value
argm1 = row index
argm2 = column index
object.ID() = {int} left-value
object.NAME() = {String} left-value
object.IMAGE() = {Image_uch} left-value
object.CAMERA() = {Camera} left-value
object.IO_PARA12() = {Vector} left-value
object.IO_PARA21() = {Vector} left-value
object.EO_PARA() = {Vector} left-value
object.NUMSCALE() = {double} left-value
object.FLAG_RDD() = {bool} left-value
object.FLAG_EARTH() = {bool} left-value
object.FLAG_REFRACT() = {bool} left-value
Example:
| ->Ph1(10,20) = 35 | set value of element at row 10, column 20 |
| ->cam_new =
Camera() ->cam_new.load("cam_osu") ->ph1.camera() = cam_new |
set a new camera to the photo |
| ->Ph1.flag_earth() = 1 | turn on the earth curvature correction flag |
Class function