lygia/sample/opticalFlow)sample an optical flow direction where the angle is encoded in the Hue and magnitude in the Saturation
Dependencies:
Use:
sampleFlow(<SAMPLER_TYPE> tex, <vec2> st)
#ifndef SAMPLEOPTICALFLOW_SAMPLE_FNC
#define SAMPLEOPTICALFLOW_SAMPLE_FNC(TEX, UV) SAMPLER_FNC(TEX, UV).rgb
#endif
#ifndef FNC_SAMPLEOPTICALFLOW
#define FNC_SAMPLEOPTICALFLOW
vec2 sampleOpticalFlow(SAMPLER_TYPE tex, vec2 st) {
vec3 data = SAMPLEOPTICALFLOW_SAMPLE_FNC(tex, st);
vec3 hsv = rgb2hsv(data.rgb);
float a = (hsv.x * 2.0 - 1.0) * PI;
return vec2(cos(a), -sin(a)) * hsv.y;
}
vec2 sampleOpticalFlow(SAMPLER_TYPE tex, vec2 st, vec2 resolution, float max_dist) { return sampleOpticalFlow(tex, st) * (max_dist / resolution); }
#endif
Dependencies:
Use:
sampleFlow(<SAMPLER_TYPE> tex, <float2> st)
#ifndef SAMPLEOPTICALFLOW_SAMPLE_FNC
#define SAMPLEOPTICALFLOW_SAMPLE_FNC(TEX, UV) SAMPLER_FNC(TEX, UV).rgb
#endif
#ifndef FNC_SAMPLEOPTICALFLOW
#define FNC_SAMPLEOPTICALFLOW
float2 sampleOpticalFlow(SAMPLER_TYPE tex, float2 st) {
float3 data = SAMPLEOPTICALFLOW_SAMPLE_FNC(tex, st);
float3 hsv = rgb2hsv(data.rgb);
float a = (hsv.x * 2.0 - 1.0) * PI;
return float2(cos(a), -sin(a)) * hsv.y;
}
float2 sampleOpticalFlow(SAMPLER_TYPE tex, float2 st, float2 resolution, float max_dist) { return sampleOpticalFlow(tex, st) * (max_dist / resolution); }
#endif
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