retrieve i-th previous element width */

fixed character width decode assist * bar+space width are compared as a fraction of the reference dimension "x" * - +/- 1/2 x tolerance * - mea

return current element color */

Multiplication in GF(2**8) when one of the numbers is known to be non-zero (proven by representing it by its logarithm).*/

extract error information and create exception.

Assumes 0<=_bits<=16.*/

check and release shared state lock */

retrieve bar+space pair width starting at offset i */

Multiplication in GF(2**8) using logarithms.*/

* Reads the charset2uni table from standard input. */

* Computes the uni2charset[0x0000..0x2ffff] array. */

Evaluates a line equation at a point. _line: The line to evaluate. _x: The X coordinate of the point. _y: The y coordinate of the point.

acquire shared state lock */

* Outputs the charset to unicode table and function. */

* Outputs the unicode to charset table and function, using a packed array. * (Suitable if the table is sparse.) * The argument 'monotonic' may be se

ensure output buffer has sufficient allocation for request */

Map from the image (at subpel resolution) into the square domain.*/

Retrieve a bit (guaranteed to be 0 or 1) from the image, given coordinates in subpel resolution which have not been bounds checked.*/

Mark a given region as belonging to the function pattern.*/

Eliminate outliers from the classified edge points with RANSAC.*/

Solve a quadratic equation x**2 + _b*x + _c in GF(2**8) using the method of~\cite{Wal99}. Returns the number of distinct roots. ARTICLE{Wal99,

video.next_image and video.recycle_image have to be thread safe * wrt/other apis */

lock must be held */

Estimates the size of a module after classifying the edge points. _width: The distance between UL and UR in the square domain. _height: The dista

Finish a partial projection, converting from homogeneous coordinates to the normal 2-D representation. In loops, we can avoid many multiplies by

Perform a least-squares line fit to a list of points. At least two points are required.*/

Returns the cross product of the three points, which is positive if they are in CCW order (in a right-handed coordinate system), and 0 if they're

window.draw has to be thread safe wrt/other apis * FIXME should be a semaphore */