2009年10月21日 星期三
接到64號快速道路(八里新店快速道路)超速罰單,準備申訴
2009年10月15日 星期四
Canon MF4350d 黑白雷射 三合一 事務機開箱文









2009年10月12日 星期一
新竹 竹北崇義 新月沙灘 及山腳漁港

2009年10月9日 星期五
2.4g 無線影音傳輸器,採用USB接收盒
無線電腦轉電視傳輸系統

2009年10月6日 星期二
Speed dome auto focus speed (AF speed)
In Security camera field, auto focus zoom camera is key component in the speed dome.

The camera module main supplier is including SONY, Panasonic, LG, CNB and etc.
How to measure the Auto focus speed (AF speed)?
1. zoom speed:
When you control the zoom times from 1x to 18x, the speed must be quick.
2. Auto focus speed
When you choose the 18x zoom position, the image must quickly become sharp image.
If we compare with DV, the security zoom camera does not care about the noise that stepping motor make.
What the speed is good?
I do not have the quantification number.
We always compare with SONY 18x AF camera module
(FCB-EX480). See the demo film as below.
Auto focus Algorithm is still secret. But it usually divided two step.
step 1: tracing curve
This noun is invented by
Step 2: using contrast Algorithm or math differentiation to get local maximum value
Taiwan AF manufacturer follow step1 and step2 to do develop the zoom camera but most of China AF manufacturer only do step 2.
I got the
General speaking, the AF speed from china maker could not compare with brand maker (SONY and etc).
See the demo film as below.
2009年10月5日 星期一
板橋 埔墘生活機能 (近 江子翠 新埔 萬華)





安全監控到底有沒有獵人頭公司 (Head Hunter)
2009年10月4日 星期日
Quantification Analysis for IP cam
There is several type of IP CAM in the market. In this topic, I will be quantification for these factors. For example, PTZ, MPEG-4/MJPEG, CCD/ CMOS and etc.
What kind of factor is more important? What is its relative value
I will depend on Axis IP CAM price to analysis the factor value using
Numerical analysis:
1. I get the Axis IP cam price from Axis’
2. I think these price lists will inform me two information
A. sort/priority of factor
B. The relative weight of factor. But not absolute weight
3. Finally, we can understand which factor is important and realize every factors’ relative weight.
First, I divided Axis IP CAM into 3 types.
Those are Low cost CMOS IP CAM, middle end CCD IP cam and PTZ/speed dome series.


The add value form high to low is as below.
1. PTZ platform :Fixed <>
2. Auto focus: fixed <>
3. resolution : VGA <>
4. D/N switch normal <>
5. Sensor : CMOS <>
6. Compression : MPEG4 <> We only can realize the factor rank (relative value) but NOT its quantification (absolute value ).
The idea for using Video Algorithm method to represent IR Cut Filter (IRCF) & OLFP (Optical Low Pass Filter).
What is optical filter?
If you know Chinese character, you can reference the website as below.
http://bbs.cpsmedia.cn/frame.php?frameon=yes&referer=http://bbs.cpsmedia.cn/
Depending on that article, he inform me that Optical filter will improve two points
1. Infrared
2. Adjust the high frequency video image. (My English is not very good. So I do not use the “correct “ word to describe )
Some one asks me if we can use digital video Algorithm to replace optical filter?
I haven’t seen the Algorithm so far, especially adjust the Infrared
1. Infrared
In security or surveillance field, we want to cut infrared in daytime but we must need infrared in the night.
In daytime, we want to cut infrared because of beautiful picture.
We can see the comparison table as below.
The left picture is without IR cut filter. (that means the infrared will input the sensor )
The right picture is with IR Cut filter.
But in the night, we need capture the video by using extra infrared light source.
That is why we often hear Day & Night camera in the market.
The D&N camera has a switch IR cut filter machine controlled by motor. In daytime, the IR cut filter will auto be “with” IR cutl filter.
In the evening, the IR cut filter will auto be “without” IR cut filter.
If you have ability to let left picture to become right picture by using video Algorithm.
Be careful we will become rich guy.
2.Adjust the high frequency video image.
When I first to touch optical low pass filter (OLPF), I also think this thing is like stock’s moving average line (MA).
Compare with 1day MA and 10day MA, 10 day MA will be smoother than 1 MA.
That is trade off for detail information and trend (average).
The OLPF is like this. It will cut off Moiré (false color). But sometime it will loss a little resolution.

But the Day & Night camera will separate two parts, IR cut filter and OLPF.
Regarding IR cut filter, it will be controlled by CPU through Light Dependent Resistor signal.
2009年10月1日 星期四
新竹美食 林家肉圓 一粒12元
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