Our mobile phone currently has two main resolutions: 220x176 (?) , 320x240 (qvga), new mobile phones may have a resolution of 640x480 (VGA;
What is the resolution of 220x176 ?? Indeed, I can't know the definition of this specification even though I checked the relevant information. I checked some arm information and some ov series documents .... 220x176 is considered as a non-standard resolution specification.
I think it is necessary to unify the title of this specification when I see the incorrect title on the Internet and in our forum... In fact, the rules are defined by people. If there are too many people, everyone will agree... However, there must be sufficient basis for defining this specification. Now, I will elaborate on the definition of this series as follows:
1. Let's first list several resolution specifications to be referenced.
Specifications, width, height, and height pixels
Qqcif 88 72 1.2222 6336
Sub-qcif 128 96 1.3333 12288
Qqvga 160 120 1.3333 19200
Qcif 176 144 1.2222 25344
? 208 176 1.1818 36608
? 220 176 1.2500 38720
? 240 176 1.3636 42240
Qvga 320 240 1.3333 76800
CIF 352 288 1.2222 101376
VGA 640 480 1.3333 307200
Svga 800 600 1.3333 480000
XGA 1024 768 1.3333 786432
Wxga 1280 800 1.6000 1024000
Uvga 1280 960 1.3333 1228800
Sxga 1280 1024 1.2500 1310720
Sxga + 1400 1050 1.3333 1470000
Usvga 1600 1200 1.3333 1920000
Wsuvga + 1920 1080 1.7888 2073600
Wsuvga 1920 1200 1.6000 2304000
Suvga 1920 1440 1.3333 2764800
Uxga 2048 1536 1.3333 3145728
Uwxga 2560 1600 1.6000 4096000
Usxga 2560 2048 1.2500 5242880
The relationship between the above CIF series pixels:
CIF = qcif * 4 = qqcif * 4*4;
Sub-qcif is approximately equal to 1/8 of CIF value, and approximately equal to 1/2 qcif value. The relationship between the above VGA series pixels:
VGA = qvga * 4 = qqvga * 4*4;
2. Therefore, after accurate comparison and calculation, we can see that 220x176 and VGA series are easier to match. The relationship is:
220x176 is approximately equal to 1/8 of VGA and approximately equal to 1/2 of qvga. Therefore, it can be viewed as sub-qvga.
The comparison of ××× and above is obtained after comprehensive screening of nearly 40 common resolutions. ×××
3. After we confirm that 220x176 is a sub-qvga specification, we refer to other resolution definition schemes and define the following two resolution names:
208x176 (sub-qvga -)
240x176 (sub-qvga +)
4. Finally, we will sort out the three non-standard resolution names defined above (these are currently mainstream but non-standard) as follows:
208x176 sub-qvga-
220x176 sub-qvga
240x176 sub-qvga +
VGA: video graphics array
qvga: Quarter video graphics array
qqvga: Quarter qvga
sub-qvga: sub quarter qvga
CIF: Common intermediate format
qcif: Quarter common intermediate format
qqcif: Quarter qcif
