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G491 OCR Advancing Physics
Transcript of G491 OCR Advancing Physics
OFF (0) Base 2 No. of possibilities calculated by doing power of 2
IE. 2^No of bits 8 bits = 1 Byte 4 bits = 1 Nibble Altering images +/- a number to the pixels increases/decreases the brightness multiply or divide the number of pixels makes the image brighter and increases contrast/ darker and decrease contrast. False colour, change the meaning of numbers to highlight sections. Reduce noise with replacing the pixel with the median of surrounding pixels The laplace rule finds edges:
Multiply by 4
Subtract value of pixels above, below, left and right
Any pixel not on an edge goes black. Sampling should be twice maximum frequency Electricity Resistance = V/I
Conductance = I/V P = IV = I^2R Circuits Series Parrallel Rt = R1 + R2 + R3 Rt = 1/R1 + 1/R2 + 1/R3 Potential dividers are just a ratio! Hooke's Law Extension of a wire is proportional to the load or force F=Ke Resistance of materials R = L/A Ohm meters 1/R = conductance = siemens per meter