image frequency


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image frequency

[′im·ij ‚frē·kwən·sē]
(electronics)
An undesired carrier frequency that differs from the frequency to which a superheterodyne receiver is tuned by twice the intermediate frequency.
References in periodicals archive ?
The detailed AMOLED display features eight color mode options and a high image frequency for a fluid viewing experience.
"Instead of a using a movable antenna, which measures the image point by point, one can use a larger number of antennas to obtain a video-like image frequency," says Holl.
Classification Based on Image Frequency. Radiographic images have special frequency and amplitude characteristics, which are position dependent.
The colored digital image that has been produced by scanning the pavement surface was later converted to a grayscale image to generate a grayscale image frequency histogram.
Indeed, this is a sinusoidal function modulated by a Gaussian envelope acting as a band pass that can be used to extract a specific image frequency band.
The bandpass filters are used in the radio frequency receivers for suppression of the image frequency which results in improved noise figure, especially for parallel coupled microstrip lines filter which has many advantages, such as easy design procedure, wide bandwidth, planar structure, long-narrow aspect ratio and the ability to be placed axially rotated in the receiver channel [9,10].
In this paper, Multiple digital images watermarking in segmented image frequency domain non blind algorithm for colour digital image watermarking is presented, This algorithm uses the blue channel for watermarking embedding.
For intention to compare ITF image frequency characteristics at first we measured ITF images of grain unimpressed by magnetic field.
The image reject mixer eliminates the need for an image bandpass filter after the ouptut amplifier to remove signal power at the image frequency. Using 0.15 micron gate length GaAs pseudomorphic high electron mobility transistor device model technology, this upconverter covers the 21.2 to 23.6 GHz frequency bands.
To prevent such "image response," the receiver design almost always includes a filter to keep the image frequency away from the mixer.