Abstract: Techniques for bi-manual control of an operation may allow gestural input for the operation to be inputted blindly with one hand while a user's attention remains on the other hand. An operation invoked and controlled by the gestural input may automatically associate with an operation controlled by the other hand. The gestural input may facilitate blind control of the operation by being able to be initially recognized without regard for the scale, orientation, and/or location of the invoking gestural input. Moreover, scale and/or orientation of the operation may be determined by the gestural input. Changes in scale and/or orientation of the gestural input during the blind operation may change the scale and/or orientation of the operation. The operation may manifest by displaying corresponding graphics at a location independent of the gestural input or by associating functionality of the blind operation with an operation performed by the other hand.

Abstract: Techniques for bi-manual control of an operation may allow gestural input for the operation to be inputted blindly with one hand while a user's attention remains on the other hand. An operation invoked and controlled by the gestural input may automatically associate with an operation controlled by the other hand. The gestural input may facilitate blind control of the operation by being able to be initially recognized without regard for the scale, orientation, and/or location of the invoking gestural input. Moreover, scale and/or orientation of the operation may be determined by the gestural input. Changes in scale and/or orientation of the gestural input during the blind operation may change the scale and/or orientation of the operation. The operation may manifest by displaying corresponding graphics at a location independent of the gestural input or by associating functionality of the blind operation with an operation performed by the other hand.

Abstract: A security blank is formed with a light-redirecting spatial structure including a deterministic component establishing at least one authenticating feature, and a stochastic component superimposed on the deterministic component, and sufficiently obscuring the deterministic component so as largely to frustrate recognition of the function of the authenticating feature by intensity measurement of light reflected therefrom. Recognition of the function of the authenticating feature is made possible by a method and an apparatus measuring the degree of coherence of two narrow bundles of light rays obtained from light reflected from the spatial structure upon its illumination by light of a selected wavelength.