TweetImportant Amplifier Properties Isolation For the biological subject, against electric shock from the amplifier’s power source(s)–or, how to not kill your patient while taking measurements! For the signal-to-noise ratio (SNR): isolation keeps the (60-Hz mains and other) noise out of the sensor pickup–and out of the amplifier input. One simple way to isolate the input [...]
Tags: AICHo, Amplifier Saturation, Amplifiers, Bandwidth, Biomedical Engineering, Biosignal, DAQ, DAQ Card, Differential Amplifier, Isolation, Pre-Amplifier, Single-Ended
TweetThis post is about amplifiers, how they work, and common applications. I will cover several operational amplifier configurations, and situations where each might be useful. This is part I of II for general discussion about amplifiers. Enjoy! Definition of an amplifier Definition (for Bioinstrumentation): Circuit that makes a small signal, usually voltage but occasionally current [...]
Tags: Amp, Amplifier Saturation, Amplifier Schematic, Amplifiers, Bias Current, CMRR, Common-Mode, DC offset, Diff Amp, Difference Amp, Differential Amp, Frequency Dependance, Gain, Input Impedance, Instrumentation Amp, Operational Amplifier, Output Impedance, Saturation, Wheatstone Bridge
Posted by Jeff on Dec 20, 2009 in
Biomedical Engineering
TweetThis post is a continuation from Biomedical Image Processing – IV. Contrast Stretching Contrast stretching (a.k.a. normalization) is very similar to histogram equalization, but it maps only a certain portion of the histogram to the full range. An example of this image enhancement technique is illustrated in Figure 17. If a and b are the [...]
Tags: deblurring algorithm, digital filtering, image denoising, image processing, image transformation, segmentation
Posted by Jeff on Dec 7, 2009 in
Biomedical Engineering
TweetThis post is continuing from Biomedical Image Processing – III. Enjoy Basic Image Modification While image processing operations can be performed in hardware (e.g., in cases where speed is paramount), many image processing operations are performed in software. This section discusses some of the basic processing operations performed on different types of images, including image [...]
Tags: boolean operations, component labeling, digital filters, grayscale imaging, image modification, image processing, pixels, point operations
Posted by Jeff on Dec 4, 2009 in
Biomedical Engineering
TweetThis post is continuing from Biomedical Image Processing – II. DICOM Image Standard Medical specialists have been slow to adopt widely accepted standards for image/film storage, display, and transmission. However, one standard has been adopted with reasonable success in the radiology community: DICOM (Digital Imaging and Communication in Medicine) has been progressively developed since 1983 [...]
Tags: biomedical image processing, component labeling, dicom, dicom image standard, image analysis, image classification, intensity histogram, m-mode
