Source code for raytraverse.sampler.imagesampler
# -*- coding: utf-8 -*-
# Copyright (c) 2020 Stephen Wasilewski, HSLU and EPFL
# =======================================================================
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# =======================================================================
import os
import numpy as np
from raytools import io
from raytraverse.lightpoint import LightPointKD
from raytraverse.mapper import ViewMapper
from raytraverse.sampler.samplerpt import SamplerPt
from raytraverse.renderer import ImageRenderer
[docs]
class ImageSampler(SamplerPt):
"""sample image (for testing algorithms).
Parameters
----------
scene: raytraverse.scene.ImageScene
scene class containing image file information
scalefac: float, optional
by default set to the average of non-zero pixels in the image used to
establish sampling thresholds similar to contribution based samplers
"""
def __init__(self, scene, vm=None, scalefac=None, method='linear',
color=False, uv=False, **kwargs):
engine = ImageRenderer(scene.scene, vm, method, color=color, uv=uv)
super().__init__(scene, engine, features=engine.features,
stype="image", **kwargs)
if scalefac is None:
img = io.hdr2array(scene.scene)
scalefac = np.average(img[img > 0])
self.accuracy *= scalefac
self.vecs = None
self.lum = []
def _run_callback(self, point, posidx, vm, write=False, **kwargs):
return LightPointKD(self.scene, self.vecs, self.lum, vm=vm, pt=point,
posidx=posidx, src=self.stype, write=write,
features=self.features, **kwargs)
[docs]
class DeterministicImageSampler(ImageSampler):
ub = 1
[docs]
def run(self, point, posidx, mapper=None, lpargs=None, **kwargs):
if mapper is None:
mapper = ViewMapper(jitterrate=0)
mapper.jitterrate = 0
return super().run(point, posidx, mapper=mapper, lpargs=lpargs,
**kwargs)