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# First deliverable |
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In this first deliverable we were called to implement a number of functions that: |
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- produce an RBG image from a Bayer pattern array of samples |
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- quantize and dequantize the image using any desired number of bits |
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- transform the image to the PPM format and save it to disk |
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\section{Κβαντισμός} |
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Στα πλαίσια της εργασίας υλοποιήθηκαν επίσης ένας ομοιόμορφος, συμμετρικός κβαντιστής χωρίς νεκρή ζώνη, \texttt{myquant} και ο αντίστοιχος αποκβαντιστής, \texttt{mydequant}, καθώς επίσης και δύο συναρτήσεις που εφαρμόζουν τον κβαντιστή και αποκβαντιστή στο κάθε κανάλι της εικόνας ξεχωριστά, \texttt{imagequant} και \texttt{imagedequant} αντίστοιχα. |
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\section{Πρότυπο PPM} |
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Τέλος υλοποιήθηκε η συνάρτηση \texttt{saveasppm} η οποία μετατρέπει την εικόνα σε μορφή που συμμορφώνεται με το πρότυπο PPM και την αποθηκεύει στο δίσκο. |
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\section{Εκτέλεση και αποτελέσματα} |
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Οι συναρτήσεις που υλοποιήθηκαν χρησιμοποιήθηκαν σε συνδυασμό με την δοκιμαστική εικόνα που δόθηκε ώστε να παράξουν τις παρακάτω εικόνες: |
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\begin{figure}[H] |
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\centering |
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\resizebox{\textwidth}{!}{ |
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\includegraphics{res/nearest_3bit_960X1280.png} |
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} |
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\caption{RGB εικόνα με χρήση \textbf{κοντινότερου γείτονα}, διαστάσεις 960Χ1280 και \textbf{κβαντισμό 3bit} ανά κανάλι} |
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\end{figure} |
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\begin{figure}[H] |
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\centering |
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\resizebox{\textwidth}{!}{ |
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\includegraphics{res/nearest_8bit_960X1280.png} |
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} |
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\caption{RGB εικόνα με χρήση \textbf{κοντινότερου γείτονα}, διαστάσεις 960Χ1280 και \textbf{κβαντισμό 8bit} ανά κανάλι} |
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\end{figure} |
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|
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\begin{figure}[H] |
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\centering |
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\resizebox{\textwidth}{!}{ |
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\includegraphics{res/linear_3bit_960X1280.png} |
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} |
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\caption{RGB εικόνα με χρήση \textbf{γραμμικής παρεμβολής}, διαστάσεις 960Χ1280 και \textbf{κβαντισμό 3bit} ανά κανάλι} |
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\end{figure} |
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|
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\begin{figure}[H] |
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\centering |
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\resizebox{\textwidth}{!}{ |
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\includegraphics{res/linear_8bit_960X1280.png} |
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} |
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\caption{RGB εικόνα με χρήση \textbf{γραμμικής παρεμβολής}, διαστάσεις 960Χ1280 και \textbf{κβαντισμό 8bit} ανά κανάλι} |
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\end{figure} |
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Παρακάτω παρατίθενται ενδεικτικά οι χρόνοι εκτέλεσης των βασικών συναρτήσεων για επιλεγμένες διαστάσεις τελικής εικόνας 960Χ1280 καθώς: |
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\begin{table}[H] |
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\centering |
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\begin{tabular}{l l} \toprule |
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Συνάρτηση & Χρόνος (seconds) \\ \midrule |
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\texttt{bayer2rgb} (``nearest'') & 0.164 \\ |
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\texttt{bayer2rgb} (``linear'') & 0.484 \\ |
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\texttt{imagequant} & 0.0315 \\ |
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\texttt{imagedequant} & 0.024 \\ |
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\texttt{saveasppm} & 0.208 \\ \bottomrule |
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\end{tabular} |
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\caption{Χρόνοι βασικών συναρτήσεων} |
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\end{table} |
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Σημειώνεται ότι οι παραπάνω χρόνοι υπολογίστηκαν με χρήση των εντολών \texttt{tic} και \texttt{toc}, ενώ η χρήση της επιλογής ``Run and Time'' ανέφερε πολύ μεγαλύτερους χρόνους λόγω του overhead που προσθέτει στην εκτέλεση. Το μέγεθος του αρχείου PPM που παράχθηκε με κβάντιση 8bit είναι 3,7MB. |
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\put(0.89,0.26532074){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}2k + 2\end{tabular}}}}% |
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\put(0.62682162,0.11862463){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}2k + 2\end{tabular}}}}% |
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\put(0.62682162,0.19468928){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}2k + 1\end{tabular}}}}% |
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\put(0.62682162,0.04255998){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}2k + 3\end{tabular}}}}% |
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\end{picture}% |
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\endgroup% |
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|
After Width: | Height: | Size: 11 KiB |
@ -0,0 +1,65 @@ |
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%% Creator: Inkscape inkscape 0.92.3, www.inkscape.org |
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%% PDF/EPS/PS + LaTeX output extension by Johan Engelen, 2010 |
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%% Accompanies image file 'BayerToRGBGrids.pdf' (pdf, eps, ps) |
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%% |
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%% To include the image in your LaTeX document, write |
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%% \input{<filename>.pdf_tex} |
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%% instead of |
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%% \includegraphics{<filename>.pdf} |
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%% To scale the image, write |
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%% \def\svgwidth{<desired width>} |
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%% \input{<filename>.pdf_tex} |
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%% instead of |
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%% \includegraphics[width=<desired width>]{<filename>.pdf} |
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%% |
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%% Images with a different path to the parent latex file can |
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%% be accessed with the `import' package (which may need to be |
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%% installed) using |
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%% \usepackage{import} |
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%% in the preamble, and then including the image with |
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%% \import{<path to file>}{<filename>.pdf_tex} |
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%% Alternatively, one can specify |
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%% \graphicspath{{<path to file>/}} |
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%% |
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%% For more information, please see info/svg-inkscape on CTAN: |
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%% http://tug.ctan.org/tex-archive/info/svg-inkscape |
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%% |
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\begingroup% |
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\makeatletter% |
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\providecommand\color[2][]{% |
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\errmessage{(Inkscape) Color is used for the text in Inkscape, but the package 'color.sty' is not loaded}% |
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\renewcommand\color[2][]{}% |
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}% |
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\providecommand\transparent[1]{% |
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\errmessage{(Inkscape) Transparency is used (non-zero) for the text in Inkscape, but the package 'transparent.sty' is not loaded}% |
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\renewcommand\transparent[1]{}% |
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}% |
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\providecommand\rotatebox[2]{#2}% |
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\newcommand*\fsize{\dimexpr\f@size pt\relax}% |
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\newcommand*\lineheight[1]{\fontsize{\fsize}{#1\fsize}\selectfont}% |
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\ifx\svgwidth\undefined% |
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\setlength{\unitlength}{417.27082031bp}% |
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\ifx\svgscale\undefined% |
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\relax% |
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\else% |
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\setlength{\unitlength}{\unitlength * \real{\svgscale}}% |
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\fi% |
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\else% |
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\setlength{\unitlength}{\svgwidth}% |
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\fi% |
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\global\let\svgwidth\undefined% |
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\global\let\svgscale\undefined% |
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\makeatother% |
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\begin{picture}(1,0.31229358)% |
|||
\lineheight{1}% |
|||
\setlength\tabcolsep{0pt}% |
|||
\put(0,0){\includegraphics[width=\unitlength,page=1]{BayerToRGBGrids.pdf}}% |
|||
\put(0.86294136,0.22467423){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}Bayer Grid Red samples\end{tabular}}}}% |
|||
\put(0.87372573,0.17254981){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}Bayer Grid Green samples\end{tabular}}}}% |
|||
\put(0.86473876,0.11862799){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}Bayer Grid Blue samples\end{tabular}}}}% |
|||
\put(0.83058827,0.06470618){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}RGB Grid sample\end{tabular}}}}% |
|||
\put(0,0){\includegraphics[width=\unitlength,page=2]{BayerToRGBGrids.pdf}}% |
|||
\put(0.12061771,0.1761446){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}h\end{tabular}}}}% |
|||
\put(0.22846134,0.29656998){\color[rgb]{0,0,0}\makebox(0,0)[t]{\lineheight{1.25}\smash{\begin{tabular}[t]{c}l\end{tabular}}}}% |
|||
\end{picture}% |
|||
\endgroup% |
|||
|
After Width: | Height: | Size: 11 KiB |
|
After Width: | Height: | Size: 284 KiB |
|
After Width: | Height: | Size: 1.4 MiB |
|
After Width: | Height: | Size: 162 KiB |
|
After Width: | Height: | Size: 988 KiB |
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Loading…
Reference in new issue