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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.
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 ).將影片的字幕導出, 除了簡映外, 也能用此ai網站 https://www.subeasy.ai/zh-TW 字幕轉語音 https://www.subeasy.ai/zh-TW 將聲音的人聲和背景音樂分離 https://tw.topmediai.com/ 文字生圖片 htt...