hw5.220.06

# hw5.220.06 - ECE 220 Multimedia Signal Processing Fall 2006...

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ECE 220 Multimedia Signal Processing September 19, 2006 Fall 2006 Homework 5: Modelling Low-Level Vision and Digital Camera Front-ends Assigned: September 19, 2006 Due: Wednesday, September 27, by 4:30 pm in the 220 lock-box on the 2nd floor of Phillips Office hours: See the web page for everyone’s office hours: Goals & concepts: Practice with computing frequency responses, impulse responses, and moving between the two. Solving the problem in the right domain (time or frequency). DTFT practice. Relevant text sections: Sections 6-1, 6-2, 6-4 to 6-7 Suggested Practice Problems. NOT GRADED but suggested if you need more practice or review. 6.7, 6.19 From Chapter 6 (Frequency Response of FIR Filters). Helpful problems are from the CD, under “Homework Problems with Solutions” — “Cascade of 2 FIR filters: multiplying frequency response” “Frequency Response of L-point Running Average FIR Filter” “Frequency Response of Cascade of FIR Filters” 1. Modelling low-level vision, and evaluating the cascade response in the frequency domain. Our understanding of vision — how the brain perceives visual inputs — can be roughly grouped into low-level vision and high-level vision. Low-level vision refers to the responses of the visual system to simple inputs such as sinusoidal patches (shown below). Note that if we vary the frequency of the sinusoids and measure what an observer reports to see, we can obtain a rough frequency response for the visual system (which is applicable when observers are looking at sinusoids). (We’ll talk more about this in a lecture on the HVS.) High-level vision includes recognition and cognition, and cannot be modelled using simple signal processing techniques. Low-level vision, however, can be modelled at a very basic level using what you already know.

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2 An extremely simple model of human low-level vision consists of a cascade of two zero- delay low-pass filters: one at the retina, and one in the visual cortex (also known as V1; your visual cortex is at the lower back of your head). These filters are defined below on the range .
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