Rank: 55 based on 655 downloads (last 30 days) and 44 files submitted

Michael Chan

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I was a R&D Director for software security and cryptology [2006 to 2008]. Following, I joined a firm under a statutory board involving in National Security Frameworks as a Senior Consultant [2009].

I would like very much to meet altrulistic, courageous, purposive, perspicacious people who are seeking to work on a noble cause. It is a very nourishing experience to share life lessons with compassionate, passionate people who are relentlessly seeking discoveries and growth.

Professional profile:
http://linkd.in/MichaelElijah

My Teachers:
[1] http://bit.ly/ProfessorDavidAkopian
[2] http://bit.ly/ProfessorSosAgaian
[3] http://bit.ly/ProfessorArtyomGrigoryan
[4] http://bit.ly/ProfessorErMengHwa
[5] http://bit.ly/ProfessorDanielTan

[6] http://bit.ly/ProfessorRuanJianhua
[7] http://bit.ly/ProfessorFredHudson
[8] http://bit.ly/ProfessorByeongKilLee
[9] http://bit.ly/ProfessorJinYufang
[10] http://bit.ly/ProfessorFengYusheng

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Files Posted by Michael				View all 1 - 5 of 44
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
07 May 2012	Embedding/ Hiding Image Within Image (with LSB encoding) The objective is to illustrate how an image may be embedded or hidden within another given image. Author: Michael Chan	bit, data hiding, description, lsb, profile, image within image	76	3
24 Apr 2012	Image Description Notes (with LSB encoding) The objective is to illustrate how certain reference may be made to a given image. Author: Michael Chan	text, bit, data hiding, description, profile, lsb	62	0
09 Apr 2012	Wavelet Decomposition For Images The demo decouples the wavelet operations from the plotting. Author: Michael Chan	compression, transform, denoising, multiresolution, wavelet, image processing	109	2	3.33333 3.3 \| 3 ratings
09 Mar 2012	Perspective Control/ Correction The objective is to give a simple demonstration on perspective control using 4 corners of a plane. Author: Michael Chan	image processing, perspective, control, affine, transformation, adjust	20	0
05 Mar 2012	Coordinates Scanning The objective is to demonstrate some coordinates tracing tools. Author: Michael Chan	image, coordinates, navigation, path, direction, trace	6	0

Comments and Ratings by Michael		View all 1 - 5 of 33
Updated	File	Comments	Rating
23 Apr 2012	Embedding/ Hiding Image Within Image (with LSB encoding) The objective is to illustrate how an image may be embedded or hidden within another given image. Author: Michael Chan	yes, BITGET and BITSET is more relevant.
23 Apr 2012	Embedding/ Hiding Image Within Image (with LSB encoding) The objective is to illustrate how an image may be embedded or hidden within another given image. Author: Michael Chan	That is true. The intention though is to make it easier for people to translate by handcoding it to C/ C++ or Java by reducing the use of Matlab toolboxes. However, I agree with you. I will provide 2 versions later on.
23 Feb 2012	Bit-slicing function for integer matrices function E = bitreslice(A,b_old, b_new, echo_on) Re-packages bits of a matrix of integers. Author: Damon Bradley	Thank you.
23 Feb 2012	Brush Smaller Image Or Matrix Over A Larger Matrix, Select ROI with resizeable window Illustrates how a smaller matrix may be 'brushed' against a larger one without overflowing. Author: Michael Chan	Hi Roy, Here is an example: IMG = 'lena.jpg'; % IMG : originalImage IMG = imread(IMG); IMG = rgb2gray(IMG); thicknessOfBorderRimToPad = 5; valueToPad = 0; [rowSizeOfOrgImg colSizeOfOrgImg] = size(IMG); framePadRowSize = rowSizeOfOrgImg + (2thicknessOfBorderRimToPad); framePadColSize = colSizeOfOrgImg + (2thicknessOfBorderRimToPad); framePad = zeros(framePadRowSize, framePadColSize); offset = thicknessOfBorderRimToPad; % position image in frame pad framePad (offset:(rowSizeOfOrgImg+offset-1), offset:(colSizeOfOrgImg+offset-1)) = IMG; IMG = framePad; imshow(IMG, []); I hope this is clear. You may wish to email me for further inquires, as it is easier to trace the comments in my inbox. I hope it helps. Thank you.
23 Feb 2012	Image Error Measurements Measures the differences between 2 images, and measurement of image quality. Author: Michael Chan	Hi Shashi, The utilities works with image of MxN (where M != N) as well. Try insert these lines as a test starting from line 23 in usage sample code (usage_errorMeasurementsOfImages.m) : M = 225; N = 150; IMG = imresize(IMG, [M N], 'bicubic'); I hope this is clear. You may wish to email me for further inquires, as it is easier to trace the comments in my inbox. I hope it helps. Thank you.

Comments and Ratings on Michael's Files			View all 1 - 5 of 50
Updated	File	Comment by	Comments	Rating
23 Apr 2012	Embedding/ Hiding Image Within Image (with LSB encoding) The objective is to illustrate how an image may be embedded or hidden within another given image. Author: Michael Chan	Chan, Michael	yes, BITGET and BITSET is more relevant.
23 Apr 2012	Embedding/ Hiding Image Within Image (with LSB encoding) The objective is to illustrate how an image may be embedded or hidden within another given image. Author: Michael Chan	Chan, Michael	That is true. The intention though is to make it easier for people to translate by handcoding it to C/ C++ or Java by reducing the use of Matlab toolboxes. However, I agree with you. I will provide 2 versions later on.
23 Apr 2012	Embedding/ Hiding Image Within Image (with LSB encoding) The objective is to illustrate how an image may be embedded or hidden within another given image. Author: Michael Chan	Simon, Jan	The functions would be dramatically faster if you consider the concept of pre-allocation. In modern Matlab releases MLint warns for such problems. Using BITGET and BITSET is much faster than using DEC2BIN/BIN2DEC and its strange conversion to strings. Some expressions like "(bitSize*(i-1))+bitSize" could be simplified.
23 Mar 2012	Wavelet Decomposition For Images The demo decouples the wavelet operations from the plotting. Author: Michael Chan	Kalamaya	Please mention that wavelet toolbox is needed here so everyone knows before we download it and find out it doesnt work.
23 Feb 2012	Brush Smaller Image Or Matrix Over A Larger Matrix, Select ROI with resizeable window Illustrates how a smaller matrix may be 'brushed' against a larger one without overflowing. Author: Michael Chan	Chan, Michael	Hi Roy, Here is an example: IMG = 'lena.jpg'; % IMG : originalImage IMG = imread(IMG); IMG = rgb2gray(IMG); thicknessOfBorderRimToPad = 5; valueToPad = 0; [rowSizeOfOrgImg colSizeOfOrgImg] = size(IMG); framePadRowSize = rowSizeOfOrgImg + (2thicknessOfBorderRimToPad); framePadColSize = colSizeOfOrgImg + (2thicknessOfBorderRimToPad); framePad = zeros(framePadRowSize, framePadColSize); offset = thicknessOfBorderRimToPad; % position image in frame pad framePad (offset:(rowSizeOfOrgImg+offset-1), offset:(colSizeOfOrgImg+offset-1)) = IMG; IMG = framePad; imshow(IMG, []); I hope this is clear. You may wish to email me for further inquires, as it is easier to trace the comments in my inbox. I hope it helps. Thank you.

Top Tags Applied by Michael	1 - 5 of 192
image processing, image, bioinformatics, data, plot

Files Tagged by Michael				View all 1 - 5 of 45
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
07 May 2012	Embedding/ Hiding Image Within Image (with LSB encoding) The objective is to illustrate how an image may be embedded or hidden within another given image. Author: Michael Chan	bit, data hiding, description, lsb, profile, image within image	76	3
24 Apr 2012	Image Description Notes (with LSB encoding) The objective is to illustrate how certain reference may be made to a given image. Author: Michael Chan	text, bit, data hiding, description, profile, lsb	62	0
09 Apr 2012	Wavelet Decomposition For Images The demo decouples the wavelet operations from the plotting. Author: Michael Chan	compression, transform, denoising, multiresolution, wavelet, image processing	109	2	3.33333 3.3 \| 3 ratings
09 Mar 2012	Perspective Control/ Correction The objective is to give a simple demonstration on perspective control using 4 corners of a plane. Author: Michael Chan	image processing, perspective, control, affine, transformation, adjust	20	0
05 Mar 2012	Coordinates Scanning The objective is to demonstrate some coordinates tracing tools. Author: Michael Chan	image, coordinates, navigation, path, direction, trace	6	0

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Comments and Ratings Matching Michael's Watch List			1-5 of 37
Date	File	Comment by	Comments	Rating
14 May 2012	QR Code encode and decode Functions to encode and decode a QR bar-code in images	Gonzalo Garateguy	Matt, I was having the same problem but I find out that the method to obtain the height and width are slightly different you have to change M_java.height for M_java.getHeight() and M_jata.width for M_java.getWidth()	Comment only
04 May 2012	QR Code encode and decode Functions to encode and decode a QR bar-code in images	Adnan Jahangir	There is a problem in encoding algorithm. Due to this you cannot decode the code generated by 'encode_qr'. To solve this problem open the function file 'encode_qr.m'. At the end of the file you will find the line - 'qr = logical(qr);'. Replace this with 'qr = 1-logical(qr);' (without apostrophe). Now plot the image with 'imagesc' command and type 'colormap(gray)' in command window. Now save the image to any image file type. Now you will be able to decode it with 'decode_qr' command.	5
23 Apr 2012	QR Code encode and decode Functions to encode and decode a QR bar-code in images	ARIZ ZUBAIR	when i run test_qr.m following error is generated:- Warning: Duplicate entry,C:\Users\ARIZ ZUBAIR\Desktop\qrcode\3rd_party\zxing-1.6\core\core.jar > In javaclasspath>local_validate_dynamic_path at 247 In javaclasspath>local_javapath at 157 In javaclasspath at 102 In javaaddpath at 68 In test_qr at 6 Warning: Duplicate entry,C:\Users\ARIZ ZUBAIR\Desktop\qrcode\3rd_party\zxing-1.6\javase\javase.jar > In javaclasspath>local_validate_dynamic_path at 247 In javaclasspath>local_javapath at 157 In javaclasspath at 102 In javaaddpath at 68 In test_qr at 7 ??? Undefined function or variable 'QRCodeWriter'. Error in ==> encode_qr at 28 qr_writer = QRCodeWriter; Error in ==> test_qr at 10 test_encode = encode_qr('la la la', [32 32]); please help me.	Comment only
20 Apr 2012	boxcount Fractal dimension using the 'box-counting' method for 1D, 2D and 3D sets	Nathan Orloff	I think the for loops in the function could be replaced with arrayfun to make the execution a little faster. And the output should be reshaped to be able to be used with cellfun. Other than that it is 1) correct and 2) awesome. I think that is the best you can hope for.	5
15 Feb 2012	QR Code encode and decode Functions to encode and decode a QR bar-code in images	Matt	Lior, Thanks for doing this code. I have installed ZXing and compiled the core and javase jar files. My problem is that the test_qr.m function is giving me an error when I try to run it. The actual error is 'No appropriate method, property, or field height for class com.google.zxing.common.BitMatrix'. It indicates the error is in encoder_qr.m file on line 31. When I set the debugger to stop at line 31, I saw that M_java var on line 30 was only of size 1x1. Is this variable supposed to behave like a struct and have some field values like .height and .width? So the source of the error was that Matlab did not recognize M_java.height on line 31. When I type M_java in the command line it gives me a picture of the QR code printed out, thought it doesn't appear to be sized 32 by 32. Any help would be appreciated. I'm a TA in class where we would like to used the QR codes to give cmds to the students' projects. Thank you, Matt	Comment only