1. Car Waiting Time Model in Red Light
Traffic Engineering problem
Concept:
- Green wave, you can go through a series of intersection without stopping.
- Driver Reaction time: 1-2.5 seconds
- Acceleration time: 2-4 seconds to reach the speed of the car in front of it
Math model
- r=reaction time of each driver
- a=acceleration time
- n=number of cars in front of
$$
T=n(r+a)
$$
2. Update V.S. Upgrade
Update is small change
Upgrade is big change
In daily life
- update is to make something more current or bring it up to date
- Upgrade is to raise something to a higher standard
3. Sharpness V.S. Contrast
Sharpness refers to the clarity of the edges and fine details
- Detect edge and combine the detected edges back into the original image
$$
I^{\prime}=I+\alpha\left(I-I_{\text {blurred }}\right)
$$
Contrast refers to the difference in luminance or color that makes objects distinguishable in a image
- Contrast stretching
$$
I^{\prime}=\frac{\left(I-I_{\min }\right)(255)}{I_{\max }-I_{\min }}
$$
4. Vibration V.S. Saturation
Saturation: refers to the intensity of colors
- Increasing it can make image more vivid
- Change in saturation impacts all pixel
- $S^{\prime}=S \times \text { factor }$
Vibration: more intelligent or selective forms of saturation
- Increasing it would increase the intensity or the more muted color
- Can protect certain colors like skin tone
- $S^{\prime}=S \times(1+(\text { factor } \times(1-S)))$
5. Why Kefir Yogurt so Sour
Kefir: thinner consistency than Greek yogurt
- Liquid form can accentuate the perception of sour taste
- Ethanol production (δΉι), can enhance the sour perception