diff --git a/articles/Daubechies wavelet - Wikipedia/Daubechies wavelet - Wikipedia.pdf.txt b/articles/Daubechies wavelet - Wikipedia/Daubechies wavelet - Wikipedia.pdf.txt
new file mode 100644
index 0000000..c18909c
--- /dev/null
+++ b/articles/Daubechies wavelet - Wikipedia/Daubechies wavelet - Wikipedia.pdf.txt	
@@ -0,0 +1 @@
+https://en.wikipedia.org/w/index.php?title=Daubechies_wavelet&oldid=1193512728
diff --git a/articles/Daubechies wavelet - Wikipedia/Daubechies wavelet - Wikipedia.xopp.xml b/articles/Daubechies wavelet - Wikipedia/Daubechies wavelet - Wikipedia.xopp.xml
new file mode 100644
index 0000000..a227438
--- /dev/null
+++ b/articles/Daubechies wavelet - Wikipedia/Daubechies wavelet - Wikipedia.xopp.xml	
@@ -0,0 +1,44 @@
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diff --git a/articles/Gradient - Wikipedia/Gradient - Wikipedia.pdf.txt b/articles/Gradient - Wikipedia/Gradient - Wikipedia.pdf.txt
new file mode 100644
index 0000000..20d7ac9
--- /dev/null
+++ b/articles/Gradient - Wikipedia/Gradient - Wikipedia.pdf.txt	
@@ -0,0 +1 @@
+https://en.wikipedia.org/w/index.php?title=Gradient&oldid=1206147282
diff --git a/articles/Gradient - Wikipedia/Gradient - Wikipedia.xopp.xml b/articles/Gradient - Wikipedia/Gradient - Wikipedia.xopp.xml
new file mode 100644
index 0000000..8c13dca
--- /dev/null
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diff --git a/articles/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation.xopp.xml b/articles/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation.xopp.xml
index eabb0b9..519ce53 100644
--- a/articles/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation.xopp.xml	
+++ b/articles/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation/On the Sensor Pattern Noise Estimation in Image Forensics: A Systematic Empirical Evaluation.xopp.xml	
@@ -157,6 +157,8 @@ why face noise and strong enough to be visible?</text>
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@@ -577,6 +579,110 @@ unsure why a white Gaussian</text>
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       <text font="Sans" size="11.00000000" x="407.34958821" y="159.52375178" color="#00c0ffff" ts="0" fn="">?</text>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000">566.77892269 161.75420100 569.07709368 165.08376688</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">427.05687922 219.16342878 564.01235703 219.16342878</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">316.09389361 230.07280737 337.91039406 230.07280737</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">366.27946403 229.94147347 407.42768521 229.94147347</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">316.21416818 242.55945028 351.89147695 241.08619882</stroke>
+      <text font="Sans" size="11.00000000" x="258.73949627" y="198.25312914" color="#00c0ffff" ts="0" fn="">DC: dark current it seems</text>
+      <text font="Sans" size="11.00000000" x="442.55489960" y="185.56674639" color="#00c0ffff" ts="0" fn="">seems correct</text>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">315.76755712 252.01905696 562.31230866 252.01905696</stroke>
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+      <text font="Sans" size="11.00000000" x="261.06221597" y="216.37045464" color="#00c0ffff" ts="0" fn="">zero-mean because sometimes too many electrons, sometimes
+not enough</text>
+      <teximage text="\bm{N_{DC}} \text{ follows a given law?}" left="255.10036835" top="179.61124259" right="373.76281919" bottom="197.61124259"/>
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+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">541.92608369 335.00197872 561.35840192 332.79012911</stroke>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">313.59693023 348.65922288 555.05375615 348.65922288</stroke>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">315.27529616 359.99848571 389.45402178 359.99848571</stroke>
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+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000">448.36094670 328.87610671 509.19273918 328.87610671</stroke>
+      <text font="Sans" size="11.00000000" x="192.91129116" y="285.91966172" color="#00c0ffff" ts="0" fn="">we take into account
+all kinds of noises
+but are there all listed
+and considered here?</text>
+      <text font="Sans" size="11.00000000" x="442.28138275" y="291.11365563" color="#00c0ffff" ts="0" fn="">Analog-to-Digital Converter</text>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000">392.38149100 304.85907430 305.94135591 277.24019591</stroke>
+      <text font="Sans" size="11.00000000" x="273.09528837" y="266.10240286" color="#00c0ffff" ts="0" fn="">why?</text>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">334.95371041 428.88280631 563.10993066 428.88280631</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">314.43161711 441.94470686 345.15892638 440.47808756</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">525.57211908 417.70175052 541.10027483 417.70175052</stroke>
+      <teximage text="\text{it seems that } x = \abs{\bm{K}+\frac{\bm{N_S}+\bm{N_{DC}}}{\bm{Y}}}" left="428.76506109" top="367.36148183" right="601.45306109" bottom="401.23448183"/>
+      <teximage text="(4) = g^\gamma\left[\bm{Y}\left(1 + \bm{K} + \frac{\bm{N_S}}{\bm{Y}} + \frac{\bm{N_{DC}}}{\bm{Y}}\right)\right]^\gamma + \bm{N_q}\\ (4) = g^\gamma\bm{Y}^\gamma\left(1 + \bm{K} + \frac{\bm{N_S} + \bm{N_{DC}}}{\bm{Y}}\right)^\gamma + \bm{N_q}\\" left="44.77011719" top="729.08387880" right="263.17921599" bottom="793.16285314"/>
+      <teximage text="\text{it seems that } \alpha = \gamma" left="317.49299907" top="404.19289030" right="398.48268980" bottom="420.19289030"/>
+      <teximage text="\text{Should be: } \gamma\frac{\bm{N_S}}{\bm{Y}} + \gamma\frac{\bm{N_{DC}}}{\bm{Y}} \text{, no?}" left="198.90977119" top="404.63194306" right="349.31077119" bottom="435.00394306"/>
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+      <text font="Sans" size="11.00000000" x="476.68045631" y="402.09107582" color="#00c0ffff" ts="0" fn="">why absolute?</text>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">392.32423052 441.89519826 434.00749681 441.89519826</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">469.86277298 442.50537376 563.88633217 442.50537376</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">393.95460377 466.02580416 539.09559946 466.02580416</stroke>
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+      <teximage text="\text{should be: } \bm{N_t} := \bm{I_0}(\gamma\bm{N_S} + \gamma\bm{N_{DC}}) + \bm{N_q} \text{, no?}" left="399.87742556" top="438.08651685" right="617.83242556" bottom="458.37151685"/>
+      <text font="Sans" size="11.00000000" x="266.58516478" y="381.53344562" color="#00c0ffff" ts="0" fn="">otherwise correct</text>
+      <text font="Sans" size="11.00000000" x="482.04051250" y="478.50838896" color="#00c0ffff" ts="0" fn="">otherwise correct</text>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">371.89426389 500.32371078 555.95491422 500.32371078</stroke>
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+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">314.97758991 535.82687810 344.78414246 535.82687810</stroke>
+      <text font="Sans" size="11.00000000" x="306.60429581" y="521.50385900" color="#00c0ffff" ts="0" fn="">to check after above</text>
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+      <text font="Sans" size="11.00000000" x="105.11219300" y="596.41079671" color="#ff00ffff" ts="0" fn="">no + s</text>
+      <text font="Sans" size="11.00000000" x="275.34853297" y="639.05457303" color="#00c0ffff" ts="0" fn="">for. diag.</text>
+      <text font="Sans" size="11.00000000" x="272.02496187" y="658.17009818" color="#00c0ffff" ts="0" fn="">backward diagonal</text>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">50.34236060 693.00744149 174.10761615 693.00744149</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">48.80397620 705.16595637 263.30196034 705.16595637</stroke>
+      <text font="Sans" size="11.00000000" x="50.94628673" y="704.10002990" color="#00c0ffff" ts="0" fn="">really eliminate and leak only in this case?</text>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">47.91155081 717.57942164 47.91155081 717.57942164</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">316.62953058 57.32571430 334.13330054 57.32571430</stroke>
+      <text font="Sans" size="11.00000000" x="-0.99056837" y="735.44841898" color="#00c0ffff" ts="0" fn="">seem appropriate, hoping the resolution is not so good that we are not always smooth
+what happens if apply many times the filter? Get a single color image or only edges?</text>
+      <text font="Sans" size="11.00000000" x="105.08740424" y="713.39660615" color="#00c0ffff" ts="0" fn="">?</text>
+      <text font="Sans" size="11.00000000" x="47.17761239" y="172.22262609" color="#00c0ffff" ts="0" fn="">Independent and identically distributed random variables</text>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">360.62404437 56.50215566 412.62421835 56.50215566</stroke>
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+      <text font="Sans" size="11.00000000" x="359.07074194" y="37.69319842" color="#00c0ffff" ts="0" fn="">why this value and what does it mean?</text>
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+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">316.53089235 192.43854769 558.68283155 192.43854769</stroke>
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+      <text font="Sans" size="11.00000000" x="568.17064171" y="178.51159745" color="#00c0ffff" ts="0" fn="">unclear</text>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">439.68470953 203.68699306 562.53207490 203.68699306</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">314.84570477 216.45583848 431.48563399 216.45583848</stroke>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">315.38871463 229.19762127 380.71589667 229.19762127</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="9.21976815" fill="128">402.44169532 227.68716083 561.44238776 227.68716083</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">376.62814126 274.47200321 517.09067455 274.47200321</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">351.04714329 286.04785311 560.32406307 286.04785311</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">312.97922679 296.81250429 561.84358933 296.81250429</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">315.49124603 308.36361711 560.23396916 308.36361711</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">316.04624545 320.02204164 363.83179326 320.02204164</stroke>
+      <text font="Sans" size="11.00000000" x="178.65810578" y="295.07791015" color="#ff00ffff" ts="0" fn="">4x4, should not be 15 as do not count itself? or just ease comprehension here?</text>
+      <teximage text="\text{due to } \bm{N_t}" left="384.12893366" top="223.25626348" right="438.45693366" bottom="241.63226348"/>
+      <text font="Sans" size="11.00000000" x="475.95219398" y="223.48457808" color="#00c0ffff" ts="0" fn="">i.e. PRNU signal</text>
+      <text font="Sans" size="11.00000000" x="317.38649205" y="109.90550007" color="#00c0ffff" ts="0" fn="">3</text>
+      <text font="Sans" size="11.00000000" x="50.19647041" y="370.38735939" color="#00c0ffff" ts="0" fn="">2</text>
+      <text font="Sans" size="11.00000000" x="318.54751543" y="578.12520396" color="#00c0ffff" ts="0" fn="">4</text>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">567.97026449 248.20981400 572.87123772 252.48766610</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">572.87123772 252.48766610 580.53180769 237.68657327</stroke>
+      <text font="Sans" size="11.00000000" x="315.60418216" y="260.54045353" color="#ff0000ff" ts="0" fn="">that way we get the sum of 2 possibly different PRNU
+how do they manage this blurred PRNU, feels like
+our issue with multiple sensors</text>
+      <text font="Sans" size="11.00000000" x="351.18423081" y="330.27699746" color="#00c0ffff" ts="0" fn="">really?</text>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">563.49312904 320.13842305 563.49312904 320.13842305</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">314.39006709 333.73627065 532.75157963 333.73627065</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">315.73355225 345.23487748 425.45149941 345.23487748</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">435.36695252 343.20120028 563.22885822 343.20120028</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">317.33174663 355.66226203 377.80094677 355.66226203</stroke>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">384.19355272 354.44950784 565.30581008 354.44950784</stroke>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">316.14350558 367.35519961 365.22577724 367.35519961</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">394.98787633 367.54729094 456.70659841 367.54729094</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">489.62594101 367.71454184 508.45816947 367.71454184</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">315.94102674 377.72106877 366.60925581 377.72106877</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">316.48079804 388.13849647 316.48079804 404.73507738 422.67634930 404.73507738 422.67634930 388.13849647 316.48079804 388.13849647</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">423.53784042 270.63858303 416.51850512 381.84463282</stroke>
+      <text font="Sans" size="11.00000000" x="429.48965712" y="385.16120009" color="#00c0ffff" ts="0" fn="">so get the mean of 2 possibly
+different PRNU</text>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">432.69434899 380.44435230 325.58694691 273.33695021</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">524.16630888 407.59222709 528.37640103 410.45196075</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">528.37640103 410.45196075 532.37784730 401.57107422</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">314.26844886 434.50087917 346.13238133 434.50087917</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">441.71294318 433.56376425 544.88126402 433.56376425</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">365.02576274 445.60176340 420.03471078 445.60176340</stroke>
+      <teximage text="\text{but we do not have access to } \bm{K}(m, n) \text{ and } \bm{K}(x, z)?!" left="309.00000000" top="435.00000000" right="537.65415307" bottom="454.00000000"/>
+      <text font="Sans" size="11.00000000" x="309.69839434" y="415.30856614" color="#00c0ffff" ts="0" fn="">these are conditions, to the following</text>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">390.41055227 445.60207347 313.69884147 421.49561895</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">442.26677121 439.48314369 562.28575784 439.48314369</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">387.30225921 452.65916899 401.10858044 451.73128741</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">313.38197949 415.80469573 538.66277663 415.80469573</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">412.63857372 451.38234991 561.04072662 451.38234991</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">315.52311483 463.90778663 502.39420509 463.90778663</stroke>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">433.58202421 456.78312925 312.09475568 401.79916868</stroke>
+      <text font="Sans" size="11.00000000" x="436.31109580" y="450.54305366" color="#00c0ffff" ts="0" fn="">?</text>
+      <stroke tool="pen" ts="0" fn="" color="#ff00ffff" width="2.26000000" fill="255">546.53214135 459.51595620 543.41681992 465.51890079</stroke>
+      <text font="Sans" size="11.00000000" x="302.27451479" y="307.35030861" color="#00c0ffff" ts="0" fn="">For the threshold see the following. But how do we
+figure out an alternative signed</text>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">379.36217405 317.42390775 443.00946924 455.29135944</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">314.58706954 477.60916533 347.72873364 477.60916533</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">428.38520871 477.24139325 561.24097973 477.24139325</stroke>
+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">315.96023805 488.19927931 461.52338554 488.19927931</stroke>
+      <text font="Sans" size="11.00000000" x="315.46383251" y="486.37514606" color="#00c0ffff" ts="0" fn="">the shot noise is not modelled as taking that wide
+values, is it?</text>
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+      <text font="Sans" size="11.00000000" x="362.36576562" y="511.10941461" color="#00c0ffff" ts="0" fn="">still unclezr how they precisely proceed</text>
+      <stroke tool="pen" ts="0" fn="" color="#00c0ffff" width="2.26000000" fill="255">339.92855204 596.66641656 358.20481865 596.66641656</stroke>
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+      <text font="Sans" size="11.00000000" x="318.21478585" y="599.82615179" color="#00c0ffff" ts="0" fn="">like?</text>
+      <text font="Sans" size="11.00000000" x="471.81001175" y="609.90355150" color="#00c0ffff" ts="0" fn="">for random noise, right?</text>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">471.85007597 625.50706615 541.95760162 625.50706615</stroke>
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@@ -595,6 +960,47 @@ unsure why a white Gaussian</text>
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+      <text font="Sans" size="11.00000000" x="44.89669362" y="226.38554307" color="#00c0ffff" ts="0" fn="">5</text>
+      <text font="Sans" size="11.00000000" x="313.66404419" y="162.11484252" color="#00c0ffff" ts="0" fn="">7</text>
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