composite-filter's Introduction

composite filter

yet another composite filter, in Python

this filter encodes an input image to composite baseband according to BT.1700 (no blanking, no sync), and then decodes back to RGB.

PM5544 test pattern taken from Wikimedia Commons. SMPTE color bars test pattern taken from Wikimedia Commons.

Requirements

This script requires numpy for arrays and matrix math.

This script requires scipy.signal for signal processing.

This script requires PIL.Image for image file interactions.

This script requires matplotlib for graphs.

Usage

usage: composite_filter.py [-h] [-dbg] [-skp] [-nnv] [-pfd] [-prg] [-isf] [-irs] [-war] [-pic] [-rsm RESOLUTION_MULTIPLIER] input_image

yet another composite filter

positional arguments:
  input_image           input image

options:
  -h, --help            show this help message and exit
  -dbg, --debug         enable debug plot
  -skp, --skip-plot     skip plot
  -nnv, --neigbor-vertical
                        use nearest-neighbor scaling for vertical resolution
  -pfd, --prefilter-disable
                        disable image lowpassiing before encoding to composite
  -prg, --progressive   scale to 240 lines instead of 480
  -isf, --interlace-separate-frames
                        output one file per field
  -irs, --input-resolution-samplerate
                        use the image input's horizontal resolution as samplerate. minimum is 720 pixels
  -war, --wide-aspect-ratio
                        use wide aspect ratio for output
  -pic, --phase-invert-colorburst
                        invert phase of colorburst
  -rsm RESOLUTION_MULTIPLIER, --resolution-multiplier RESOLUTION_MULTIPLIER
                        multiply the samplerate by x. makes the image sharper at the cost of filtering time

version 0.0.2