Methods and apparatus to encrypt media for identification
Methods, apparatus, systems, and articles of manufacture are disclosed to encrypt media for identification. An example apparatus accesses a mesh points matrix. Additionally, the example apparatus sets an upper limit equal to a larger of two values of a vector, respective ones of the two values equal to elements of the vector at indices equal to respective values of a coordinate pair of the mesh points matrix and set a lower limit equal to a smaller of the two values of the vector. The example apparatus also appends a value to an encryption vector, the value based on whether the lower limit is equal to zero, the value equal to a lowest integer not less than a quotient of a number based on a square of the upper limit and two and encrypt an input matrix with the encryption vector.
1. An apparatus comprising:
memory;
machine readable instructions; and
processor circuitry to execute the machine readable instructions to at least:
access a mesh points matrix, the mesh points matrix representative of a mesh generated based on an encryption matrix and excluding overlapping edge connections;
set an upper limit equal to a larger of two values of a vector, respective ones of the two values equal to elements of the vector at indices equal to respective values of a coordinate pair of the mesh points matrix;
set a lower limit equal to a smaller of the two values of the vector;
append a value to an encryption vector, the value based on whether the lower limit is equal to zero, the value equal to a lowest integer not less than a quotient of a number based on a square of the upper limit and two; and
encrypt an input matrix with the encryption vector.
2. The apparatus of claim 1 , wherein in response to the lower limit not equaling zero, the processor circuitry is to:
determine the lowest integer not less than the quotient, the quotient being of (1) a difference between the square of the upper limit and a square of the lower limit and (2) two; and
append the lowest integer not less than the quotient to the encryption vector.
3. The apparatus of claim 1 , wherein in response to the lower limit equaling zero, the processor circuitry is to:
determine the lowest integer not less than the quotient, the quotient being of (1) the square of the upper limit and (2) two; and
append the lowest integer not less than the quotient to the encryption vector.
4. The apparatus of claim 1 , wherein the coordinate pair includes non-zero values.
5. The apparatus of claim 1 , wherein the input matrix is representative of media to be encrypted.
6. The apparatus of claim 1 , wherein the encryption matrix includes a binary representation of a watermark.
7. The apparatus of claim 1 , wherein the number is a first number, the value is a first value, and the processor circuitry is to append a second number of second values to the encryption vector, the second number of second values equal to a third number of non-zero coordinate pairs of the mesh points matrix.
8. A non-transitory computer readable storage medium comprising instructions which, when executed, cause processor circuitry to at least:
access a mesh points matrix, the mesh points matrix representative of a mesh generated based on an encryption matrix and excluding overlapping edge connections;
set an upper limit equal to a larger of two values of a vector, respective ones of the two values equal to elements of the vector at indices equal to respective values of a coordinate pair of the mesh points matrix;
set a lower limit equal to a smaller of the two values of the vector;
append a value to an encryption vector, the value based on whether the lower limit is equal to zero, the value equal to a lowest integer not less than a quotient of a number based on a square of the upper limit and two; and
encrypt an input matrix with the encryption vector.
9. The computer readable storage medium of claim 8 , wherein in response to the lower limit not equaling zero, the instructions cause the processor circuitry to:
determine the lowest integer not less than the quotient, the quotient being of (1) a difference between the square of the upper limit and a square of the lower limit and (2) two; and
append the lowest integer not less than the quotient to the encryption vector.
10. The computer readable storage medium of claim 8 , wherein in response to the lower limit equaling zero, the instructions cause the processor circuitry to:
determine the lowest integer not less than the quotient, the quotient being of (1) the square of the upper limit and (2) two; and
append the lowest integer not less than the quotient to the encryption vector.
11. The computer readable storage medium of claim 8 , wherein the coordinate pair includes non-zero values.
12. The computer readable storage medium of claim 8 , wherein the input matrix is representative of media to be encrypted.
13. The computer readable storage medium of claim 8 , wherein the encryption matrix includes a binary representation of a watermark.
14. The computer readable storage medium of claim 8 , wherein the number is a first number, the value is a first value, and the instructions cause the processor circuitry to append a second number of second values to the encryption vector, the second number of second values equal to a third number of non-zero coordinate pairs of the mesh points matrix.
15. A method comprising:
accessing a mesh points matrix, the mesh points matrix representative of a mesh generated based on an encryption matrix and excluding overlapping edge connections;
setting, by executing an instruction with processor circuitry, an upper limit equal to a larger of two values of a vector, respective ones of the two values equal to elements of the vector at indices equal to respective values of a coordinate pair of the mesh points matrix;
setting, by executing an instruction with the processor circuitry, a lower limit equal to a smaller of the two values of the vector;
appending, by executing an instruction with the processor circuitry, a value to an encryption vector, the value based on whether the lower limit is equal to zero, the value equal to a lowest integer not less than a quotient of a number based on a square of the upper limit and two; and
encrypting, by executing an instruction with the processor circuitry, an input matrix with the encryption vector.
16. The method of claim 15 , further including in response to the lower limit not equaling zero:
determining the lowest integer not less than the quotient, the quotient being of (1) a difference between the square of the upper limit and a square of the lower limit and (2) two; and
appending the lowest integer not less than the quotient to the encryption vector.
17. The method of claim 15 , further including in response to the lower limit equaling zero:
determining the lowest integer not less than the quotient, the quotient being of (1) the square of the upper limit and (2) two; and
appending the lowest integer not less than the quotient to the encryption vector.
18. The method of claim 15 , wherein the coordinate pair includes non-zero values.
19. The method of claim 15 , wherein the input matrix is representative of media to be encrypted.
20. The method of claim 15 , wherein the encryption matrix includes a binary representation of a watermark.
21. The method of claim 15 , wherein the number is a first number, the value is a first value, and the method further includes appending a second number of second values to the encryption vector, the second number of second values equal to a third number of non-zero coordinate pairs of the mesh points matrix.