OpenCV4Android-image Basics

1. OpenCV matrix data type

CV _ <bit_depth> (S | U | F) C <number_of_channels>

S = signed integer U = unsigned integer F = floating point type

E. g .:

CV_8UC1 refers to an 8-bit unsigned integer single-channel matrix,
CV_32FC2 is a 32-bit floating-point dual-channel matrix.

 

So we can see the following three forms: Gray, RGB, and RGBA.

'Cv _ 8UC1 '(gray-scale), 'cv _ 8uc3' (RGB) or 'cv _ 8UC4' (RGBA ).

2. About colors
Extracted from http://www.cnblogs.com/and_he/archive/2012/12/22/ARGB.html below

A: Transparency

R: red

G: Green

B: Blue

Bitmap. config ARGB_4444: each pixel occupies four places, that is, A = 4, R = 4, G = 4, B = 4. Therefore, one pixel occupies 4 + 4 + 4 + 4 = 16 digits.

Bitmap. config ARGB_8888: each pixel occupies four places, that is, A = 8, R = 8, G = 8, B = 8, so A pixel occupies 8 + 8 + 8 + 8 = 32

Bitmap. Config RGB_565: each pixel occupies four places, namely, R = 5, G = 6, B = 5, and no transparency. Therefore, each pixel occupies 5 + 6 + 5 = 16 digits.

Bitmap. Config ALPHA_8: each pixel occupies four places, with only transparency and no color.