Vision Convert Color :: QUARC Targets Library

navigation bar

Vision Convert Color

This block is currently a beta version. If you are using this block, we would appreciate any feedback at tech@quanser.com.

Converts an image from one color space to another.

Library

Description

Vision Convert Color

The Vision Convert Color block performs color transformation on the input image.

In order to use this block, be sure to follow the instructions described on the Vision Capture Image page, and take careful note of the limitations.

Input Ports

src_image

A handle to a source image that uses OpenCV (Open Source Computer Vision) IplImage structure. The input must be a 24-bit color image in BGR (Blur-Green-Red) format.

Output Ports

dst_image

Converted destination image having three 8-bit color planes. If the output is a grayscale image, the color planes will have the same intensity values in the corresponding pixels.

err

An error signal which is negative in case of invalid memory allocation or usage of invalid parameter values.

Parameters and Dialog Box

Vision Convert Color

Color space

Specifies the color space of output image. The options for color space are BGR2GRAY, BGR2YCrCb, and BGR2HSV. The options are described as follows:

                BGR2GRAY:
                Gray intensity, Y = 0.299*R + 0.587*G + 0.114*B

                BGR2YCrCb:
                Gray intensity,  Y = 0.299*R + 0.587*G + 0.114*B
                Chromatic red,  Cr = (R-Y)*0.713 + 128
                Chromatic blue, Cb = (B-Y)*0.564 + 128

                BGR2HSV:
                Brightness intensity, V = max(R,G,B)
                Saturation intensity, S = (V-min(R,G,B))/V, if V≠0,
                                          0,                otherwise
                Hue intensity,        H = (G - B)*60/S,      if V=R
                                          180+(B - R)*60/S,  if V=G
                                          240+(R - G)*60/S,  if V=B

                If H<0 then H=H+360
                On output 0≤V≤1, 0≤S≤1, and 0≤H≤360.
                The values are then converted to 8-bit destination image using
                    V = V*255, S = S*255, and= H = H/2.

Sample time

The sample time of the block. A sample time of 0 indicates that the block will be treated as a continuous time block. A positive sample time indicates that the block is a discrete time block with the given sample time. A sample time of -1 indicates that the block inherits its sample time.

Targets

Target Name	Compatible*	Model Referencing	Comments
QUARC Win32 Target	No	No	Not supported.
QUARC Win64 Target	No	No	Not supported.
QUARC Linux Nvidia Target	Yes	Yes
QUARC Linux QBot Platform Target	Yes	Yes
QUARC Linux QCar 2 Target	Yes	Yes
QUARC Linux QDrone 2 Target	Yes	Yes
QUARC Linux Raspberry Pi 3 Target	Yes	Yes
QUARC Linux Raspberry Pi 4 Target	Yes	Yes
QUARC Linux RT ARMv7 Target	Yes	Yes
QUARC Linux x64 Target	Yes	Yes
QUARC Linux DuoVero Target	Yes	Yes
QUARC Linux DuoVero 2016 Target	Yes	Yes
QUARC Linux Verdex Target	Yes	Yes
QUARC QNX x86 Target	No	No	Not supported.
Rapid Simulation (RSIM) Target	No	No	Not supported.
S-Function Target	No	N/A	Old technology. Use model referencing instead.
Normal simulation	Yes	Yes

* Compatible means that the block can be compiled for the target.