Weekly Report (19th-30th July)
Contents
Introduction
This is the report of Pallan Madhavan for the GSOC 2012 on the project "Scilab Image Processing Toolbox (SIP) " for the period 19th-30th July 2012.
Task List
Converting Scilab matrices to Pix
sci_2D_double_matrix_to_pix function
The above function is used to convert Scilab 2 Dimensional double matrix to PIX of leptonica, with the help of this function we can get the Index value by IndexImgByColInPix and do the necessary operations on the PIX available in leptonica.This function is generally used for binary images and indexed images.Here,we have used pixSetPixel function which is used to set pixel value.
sci_3D_double_hypermat_to_pix
The above function is used for conversion of Scilab 3 Dimensional hypermatrix to PIX of leptonica,with this interfacing function we can convert scilab 3 Dimensional hypermatrix to PIX of leptonica.This is generally used for true color images.The RGB values are set again using pixSetRGBPixel and PIX is formed,on which one can do necessary operation.
sci_index_map_to_pix
This function converts index matrix and map matrix to PIX of leptonica,the above function is used to create pix by setting RGB values corresponding to the index value of the colormap.Thus one can now convert indexed image into pix using 2D indexed double matrix and colormap to PIX and thus perform leptonica functions on it.
Converting Pix to Scilab matrices
pix_binary_image_to_double_array
This function converts pix binary image to scilab 2D double matrix,making it more easier for scilab to perform other operation available in siptoolbox.As every operation done is in scilab matrices.Time taken by every operation is minimal.
pix_truecolor_image_to_double_hypermat
This function converts pix true color image to 3D double hypermatrix ,the above function is used to create 3D double hypermatrix by getting RGB values from every pixel with the help of pixGetRGBPixel function available in leptoncia. Thus we get 3D double hypermatrix from it.
pix_index_map_to_sci_dbl
This function converts pix containing indexed matrix and colormap into scilab double matrices. We thus use pixGetColormap,which is used to get colormap of an image from PIX.Also pixcmapGetCount is used to count the index of an image and pixGetPixel used to get index of an image.
Things learnt
Interfacing function helped me understanding the nature of image.This also included testing of various functions in leptonica.Understanding how the pixel values are to be stored in the matrix took a lot of planning and testing time.
Commits
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