Stop weighted waveform
View Patent ↗A waveform monitor includes a brightness measuring system to generate brightness values that are then converted to stop equivalents. The conversion may be performed using a Look Up Table. The output is generated as a stop vs. time waveform. Methods of generating the stop vs. time waveform are also described.
1. A waveform monitor having an image input and a monitor for viewing a measurement display, the waveform monitor comprising:
a measuring system to measure brightness values for pixels from an original image received at the image input;
a converter structured to generate stop values from the measured brightness values; and
an output generator structure to generate a stop versus time waveform.
2. The waveform monitor of claim 1 , in which the converter structured to generate stop values comprises a Look Up Table (LUT).
3. The waveform monitor of claim 2 , in which the LUT is one of a plurality of previously stored LUTs accessible by the waveform monitor.
4. The waveform monitor of claim 2 , in which the LUT is configured to convert the measured brightness values to a Log 2 (Y/Y max ) scale, where Y is a brightness value from the measured brightness values and Y max is a maximum brightness value from the measured brightness values.
5. The waveform monitor of claim 1 , in which the converter is further structured to convert the measured brightness values into a linear light representation.
6. The waveform monitor of claim 1 , in which the stop versus time waveform includes a Y-axis scaled in stops.
7. A method of generating a display for output from a measurement instrument, the method comprising:
receiving an original image formed of pixels;
extracting brightness information from the pixels;
converting the brightness information of the pixels to stop equivalents; and
displaying the stop equivalents versus a time value.
8. The method of claim 7 , further comprising iteratively performing the receiving, the extracting, the converting, and the displaying to produce a stop versus time waveform for the stop equivalents.
9. The method of claim 7 , in which converting the brightness information of the pixels to stop equivalents includes determining the stop equivalents with a Look Up Table.
10. The method of claim 9 , in which determining the stop equivalents with the Look Up Table includes converting the brightness information to a Log 2 (Y/Y max ) scale, where Y is a brightness value within the brightness information and Y max is a maximum brightness value of the brightness information.
11. The method of claim 7 , in which converting the brightness information of the pixels to stop equivalents includes determining the stop equivalents with one of a plurality of previously stored Look Up Tables.
12. A system for assessing live video from a camera, comprising:
a camera adapted to generate a video output; and
a waveform monitor having an image input coupled to the video output of the camera and a monitor for viewing a measurement display, the waveform monitor comprising:
a measuring system to measure brightness values for pixels from an original image received at the image input;
a converter structured to generate stop values from the measured brightness values; and
an output generator structure to generate an stop versus time waveform.
13. A system for assessing live video from a camera of claim 12 , in which the converter structured to generate stop values comprises a Look Up Table (LUT).
14. A system for assessing live video from a camera of claim 13 , in which the LUT is one of a plurality of previously stored LUTs accessible by the waveform monitor.
15. A system for assessing live video from a camera of claim 13 , in which the LUT is configured to convert the measured brightness values to a Log 2 (Y/Y max ) scale, where Y is a brightness value from the measured brightness values and Y max is a maximum brightness value from the measured brightness values.
16. A system for assessing live video from a camera of claim 12 , in which the converter is further structured to convert the measured brightness values into a linear light representation.
17. A system for assessing live video from a camera of claim 12 , in which the stop versus time waveform includes a Y-axis scaled in stops.