downsample

(1) To make a digital audio signal smaller by lowering its sampling rate or sample size (bits per sample). Downsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. Contrast with upsample. See sampling.

(2) To decrease the color depth of a digital image; for example, from 24 bits to 16 bits per pixel. Contrast with upsample. See color depth and downconvert.

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References in periodicals archive

One easy, but effective approach uses a minimum pixel value filter for the downsample process which ensures a big compression rate, when used with Huffman coding for compression.

A generalized Laplacian pyramid aimed at image compression

For further verifying the effect of feature dimension to recognition accuracy, we downsample the face images to 10 x 10, 20 x 25, 25 x 30, 35 x 40 and 40 x 50, respectively, which correspond to feature dimension of 100, 500, 750, 1400 and 2000.

A robust method for partially occluded face recognition

The recognition rates when the ear is occluded using Gabor orientation + NSRC, Downsample + SRC, Random ear + SRC, and Eigenear + SRC are illustrated in Figure 9.

Robust ear recognition via nonnegative sparse representation of Gabor orientation information

According to the RSSI measuring frequency, we downsample the estimated real VO routing path.

Locating anchors in WSN using a wearable IMU-camera

The second step is to downsample the right CCD image to be matched and target area template image extracted from the left CCD image.

Target image matching algorithm based on binocular CCD ranging

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