ćwiek

http://maleesh.wordpress.com/2010/03/18/shadow-removing-with-opencv-2/

 i found this article, do you think, that it will be hard to implement it in gen? how to start with it?

hi!
i found  http://maleesh.wordpress.com/2010/03/18/shadow-removing-with-opencv-2/ i found this article, do you think, that it will be hard to implement it in gen? how to start with it?


remove-shadow-during-background-substraction

i did first steps, can you help me please? i need this functionality very much for my next piece..

i did first steps, can you help me please? i need this functionality very much for my next piece..
thank yopu very much!!!


here a shader port! I think it works a little better.

PS: the maleesh blog is protected by password...

here a shader port! I think it works a little better.
Thank you!

PS: the maleesh blog is protected by password...


woow! thats a good shader but fails to me and im not a shader wiz... :( any idea? thanks!

Fragment shader failed to compile with the following errors:

ERROR: 0:97: error(#160) Cannot convert from: "bool" to: "highp float"

ERROR: 0:98: error(#160) Cannot convert from: "bool" to: "highp float"

ERROR: 0:99: error(#160) Cannot convert from: "bool" to: "highp float"

WARNING: 0:102: warning(#402) Implicit truncation of vector from size: 1 to size: 4

ERROR: 0:105: error(#162) Wrong operand types: no operation "-" exists that takes a left-hand operand of type "const int" and a right operand of type "bool" (or there is no acceptable conversion)

WARNING: 0:106: warning(#402) Implicit truncation of vector from size: 1 to size: 4

ERROR: 0:109: error(#160) Cannot convert from: "bool" to: "highp float"

WARNING: 0:110: warning(#402) Implicit truncation of vector from size: 1 to size: 4

ERROR: 0:113: error(#160) Cannot convert from: "bool" to: "highp float"

WARNING: 0:114: warning(#402) Implicit truncation of vector from size: 1 to size: 4

ERROR: error(#273) 6 compilation errors. No code generated

jit.gl.shader: GLSL program failed to compile.

-- START GLSL INFO LOG: fp --
Fragment shader failed to compile with the following errors:
ERROR: 0:97: error(#160) Cannot convert from: "bool" to: "highp float"
ERROR: 0:98: error(#160) Cannot convert from: "bool" to: "highp float"
ERROR: 0:99: error(#160) Cannot convert from: "bool" to: "highp float"
WARNING: 0:102: warning(#402) Implicit truncation of vector from size: 1 to size: 4
ERROR: 0:105: error(#162) Wrong operand types: no operation "-" exists that takes a left-hand operand of type "const int" and a right operand of type "bool" (or there is no acceptable conversion)
WARNING: 0:106: warning(#402) Implicit truncation of vector from size: 1 to size: 4
ERROR: 0:109: error(#160) Cannot convert from: "bool" to: "highp float"
WARNING: 0:110: warning(#402) Implicit truncation of vector from size: 1 to size: 4
ERROR: 0:113: error(#160) Cannot convert from: "bool" to: "highp float"
WARNING: 0:114: warning(#402) Implicit truncation of vector from size: 1 to size: 4
ERROR: error(#273) 6 compilation errors.  No code generated
-- END GLSL INFO LOG: fp --
jit.gl.shader: GLSL program failed to compile.


on my machine, i get the following errors ....

ERROR: 0:91: 'pow' : no matching overloaded function found

ERROR: 0:93: 'pow' : no matching overloaded function found

ERROR: 0:97: '=' : cannot convert from 'bool' to 'float'

ERROR: 0:98: '=' : cannot convert from 'bool' to 'float'

ERROR: 0:99: '=' : cannot convert from 'bool' to 'float'

ERROR: 0:102: '=' : cannot convert from 'float' to '4-component vector of float'

ERROR: 0:105: '-' : wrong operand types no operation '-' exists that takes a left-hand operand of type 'const int' and a right operand of type 'bool' (or there is no acceptable conversion)

ERROR: 0:105: '=' : cannot convert from 'const int' to 'float'

ERROR: 0:106: '=' : cannot convert from 'float' to '4-component vector of float'

ERROR: 0:109: '=' : cannot convert from 'bool' to 'float'

ERROR: 0:110: '=' : cannot convert from 'float' to '4-component vector of float'

ERROR: 0:113: '=' : cannot convert from 'bool' to 'float'

ERROR: 0:114: '=' : cannot convert from 'float' to '4-component vector of float'

-- START GLSL INFO LOG: fp --
ERROR: 0:91: 'pow' : no matching overloaded function found
ERROR: 0:91: 'pow' : no matching overloaded function found
ERROR: 0:93: 'pow' : no matching overloaded function found
ERROR: 0:97: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:98: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:99: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:102: '=' :  cannot convert from 'float' to '4-component vector of float'
ERROR: 0:105: '-' :  wrong operand types no operation '-' exists that takes a left-hand operand of type 'const int' and a right operand of type 'bool' (or there is no acceptable conversion)
ERROR: 0:105: '=' :  cannot convert from 'const int' to 'float'
ERROR: 0:106: '=' :  cannot convert from 'float' to '4-component vector of float'
ERROR: 0:109: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:110: '=' :  cannot convert from 'float' to '4-component vector of float'
ERROR: 0:113: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:114: '=' :  cannot convert from 'float' to '4-component vector of float'
-- END GLSL INFO LOG: fp --
jit.gl.shader: GLSL program failed to compile.
-- START GLSL INFO LOG: fp --
ERROR: 0:91: 'pow' : no matching overloaded function found
ERROR: 0:91: 'pow' : no matching overloaded function found
ERROR: 0:93: 'pow' : no matching overloaded function found
ERROR: 0:97: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:98: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:99: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:102: '=' :  cannot convert from 'float' to '4-component vector of float'
ERROR: 0:105: '-' :  wrong operand types no operation '-' exists that takes a left-hand operand of type 'const int' and a right operand of type 'bool' (or there is no acceptable conversion)
ERROR: 0:105: '=' :  cannot convert from 'const int' to 'float'
ERROR: 0:106: '=' :  cannot convert from 'float' to '4-component vector of float'
ERROR: 0:109: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:110: '=' :  cannot convert from 'float' to '4-component vector of float'
ERROR: 0:113: '=' :  cannot convert from 'bool' to 'float'
ERROR: 0:114: '=' :  cannot convert from 'float' to '4-component vector of float'
-- END GLSL INFO LOG: fp --
jit.gl.shader: GLSL program failed to compile.


timtom GPU doesn't support pow() function and I've substitute it with (n*n) instead of pow(n,2).

and yours GPU doesn't support implicit type conversions so I cast them

mmm
I'm not a shader expert but I think: 

I get these errors. Any idea what they are??

ERROR: 0:105: '-' does not operate on 'int' and 'float'

ERROR: 0:106: Use of undeclared identifier 'lt_43'

ERROR: 0:107: Use of undeclared identifier 'outMx'

-- START GLSL INFO LOG: fp --
ERROR: 0:105: '-' does not operate on 'int' and 'float'
ERROR: 0:106: Use of undeclared identifier 'lt_43'
ERROR: 0:106: Use of undeclared identifier 'lt_43'
ERROR: 0:106: Use of undeclared identifier 'lt_43'
ERROR: 0:106: Use of undeclared identifier 'lt_43'
ERROR: 0:107: Use of undeclared identifier 'outMx'
-- END GLSL INFO LOG: fp --
jit.gl.shader: GLSL program failed to compile.


YES! thanks esnho the new one compiles fine! and even better banging the background matrix.. :)

im only getting some good results chossing out_mode 1 and tweaking param CD_squared_lt

with the other modes 0,2 or 3 seems nothing happens.. can you explain a little bit the params?

im only getting some good results chossing out_mode 1 and tweaking param CD_squared_lt
with the other modes 0,2 or 3 seems nothing happens.. can you explain a little bit the params? 

@carsol: I've done just a copy and paste porting... maybe ćwiek can explain those parameters or the password protected blog linked by him... sorry. If you try the ćwiek you'll notice that the modes are porting for the four outlets of the gen patch.

I've found this article, is not the same algorithm but it looks similar and it seems to work well, but I did not any implementations of this.

We are not talking about gen no more so, I put in a GEN patch and the relative shader patch, it's a really simple background subtraction patch.

Here is the patch, it contains the GEN and shader version:

I made a lot of confusion in this post, please forgive me.

Remove shadow during background substraction