Image
 

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Overview

Image contains a Matrix object, along with some additional spatial information.  Its main purpose is to make possible a matrix able to be placed in a 2 dimensional space.  Map projection information is also added to handle various types of Geographic information data.

Spatial information is automatically taken care of in all kind of Image object operations and functions, hence the user does not have to worry about it.

An image object has a full access to all class functions of matrix, as well as its own class functions. 

An image can have a flag_null, and its value can be 0 (off) or 1 (on).  This makes possible to omit some data, e.g. background data,  when processing an image.  When flag_null = 0, there is no omission of nulldata.

Member data

Name Data type Meaning
id int ID of an image
matrix Matrix a Matrix object
lower_left Pt2D coordinate of lower left corner of an image
upper_right Pt2D coordinate of upper right corner of an image
projection Projection map projection of an image

 

Operator

See details in operator section.

 

Construction function

{Image} ret  =  IMAGE([{int} argm1, {int} argm2, {double} argm3, {double} argm4, {double} argm5, {double} argm6, {Projection} argm7])

argm1 = no of row                      (default = 0)

argm2 = no of column                   (default = 0)

argm3 = x coordinate (lower left)      (default = 0)

argm4 = y coordinate (lower left)      (default = 0)

argm5 = x coordinate (upper right)     (default = 0)

argm6 = y coordinate (upper right)     (default = 0)

argm7 = map projection                 (default = default of Projection())

Example:

->Img = Image() an empty image

->Img = Image(100,200)

 

 

an image with 100 rows and 200 columns,

lower left = (0,0) upper right = (200,100)

Projection = default value of function Projection()

 

Lfunction

object({int} argm1, {int} argm2)   =  {double} left-value

argm1 = row index

argm2 = column index     

object.ID()          =  {int} left-value

object.LOWER_LEFT()  =  {Pt2D} left-value

object.UPPER_RIGHT(){Pt2D} left-value

object.MATRIX()      =  {Matrix} left-value

object.PROJ()        =  {Projection} left-value

object.FLAG_NULL()   =  {bool} left-value

object.NULLDATA()    =  {double} left-value

Example:

->Img(10,20) = 999 set value of element at row 10, column 20
->Img.lower_left() = Pt2D(10,200) set lower left point coordinate
->Img.upper_right() = Pt2D(100.536 ,2000.500) set upper right point coordinate
->P = Projection()

->P.setUTM(47)

->Img.projection() = P

set a particular map projection
->A = [ 1 2 3; 4 5 6; 7 8 9]

->Img.matrix() = A 

 

change content of matrix to matrix "A"

Notice that coordinates of the two corner points remain the same, while size of Img changes to 3 rows and 3 columns, according to the size of "A" 

 

Class function

 A-D  E-H  I-L M-P Q-S T-Z
(  ) EDGESOBEL ID MAKELEFT RC2XY UCHAR
ANAGLYPH FEATHER INCDANG MAKERIGHT REASSIGN UNION
ASPECT FILLPOLY INIT MATRIX RECLASS UPPER_LEFT
BICUBIC FLAG_NULL INT MAX RECTIFY UPPER_RIGHT
BILINEAR FLOAT INTERSECT MEAN RECTIFY2IMG VAR
BINARY FLOOD INTPDIST MEDIAN REPROJ VECRC2XY
BLANK GOGET INTPNEAREST MIN REPROJ2IMG VECRCPLINE2XY
BOOL GOSET IS_COVER MOSAIC RESAMPLE VECXY2RC
BWRGB GOSETMAT LOAD NCOL RES_X VECXYPLINE2RC
CLOSE HISTMATCH* LOADASC NEAREST RES_Y VIDRC2XY
COL2X HISTO LOADBIN NROW RGB VIDXY2RC
COMPMAX   LOADBMP NULLDATA RGBAUTO VISIBLE
COMPMIN   LOADGEOTIF** OVERLAP ROTATE VLOAD
COVERAGE   LOADPOINT OVERLAY ROW2Y WINDOW
DIST   LOADSURF POINTRAS SAVE X2COL
DOUBLE   LOADTIF POLYLINE SAVEASC XY2RC
DRWCIRCLE   LOOKUP* PROJ SAVEASCXYZ Y2ROW
DRWELLIPSE   LOWER_LEFT   SAVEBIN ZONING
DRWLINE   LOWER_RIGHT   SAVEBMP  
DRWPLINE       SAVEDOC  
DRWPOINT       SAVETIF  
DRWRECTANG       SD  
DRWSQUARE       SET  
DRWVECCIRCLE**       SETSYMB  
DRWVECPLINE       SETVECSYMB**  
DRWTEXT**       SHADRELF  
        SHORT  
        SIZE  
        SKIP  
        SLOPE  
        SLOPE_X  
        SLOPE_Y  
        STRETCH  
        STRETCHFIX  
        STRETCHEQ**  
        STRETCHSAT  
        SUM  

*   for class IMAGE_INT, IMAGE_SHT, and IMAGE_UCH only

**   for class IMAGE_UCH only


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