How to Enhance Low Quality CCTV Footage of a License Plate with MotionDSP Forensic
Summary
TLDRThis video tutorial demonstrates techniques for enhancing a license plate in a surveillance video for forensic analysis. It guides viewers through zooming in, setting a region of interest, and applying resolution filters with super resolution and fusion parameters. The process includes adjusting contrast and sharpening tools, and experimenting with detail mode for clarity. The tutorial concludes with creating snapshots of the enhanced license plate and saving them.
Takeaways
- 🔍 The process begins by zooming in on the license plate area for enhancement.
- 🛠 The 'region of interest' tool is activated to isolate the license plate for focused enhancement.
- 🖼 Resizing the region of interest box ensures only the license plate is enhanced, avoiding other areas.
- 🔧 The resolution filter is used, sampling up to 51 frames and applying a super resolution factor.
- 📈 Upscaling to the maximum value improves the clarity of the license plate characters significantly.
- ⚙️ Additional parameters like the fusion and accuracy settings are adjusted for further refinement.
- ✨ Applying the contrast filter helps darken the characters and make them stand out from the background.
- 🛠 The sharpening tool is employed, along with the deep learning tool, to further enhance the license plate details.
- 🧐 Testing with the detail mode shows that it can add more clarity but may distort some areas.
- 📸 Final snapshots are taken with and without the detail mode enabled, and the images are saved.
Q & A
What is the first step in enhancing the license plate in this process?
-The first step is to zoom in on the area of interest, which in this case is the license plate on the back of the vehicle.
How is the region of interest (ROI) tool activated?
-The region of interest (ROI) tool can be activated through the 'mouths tools' or by clicking on the region of interest filter.
Why is the region of interest (ROI) tool used?
-The ROI tool is used to focus on enhancing a specific area, such as the license plate, while excluding irrelevant parts like the ground.
What does the resolution filter do?
-The resolution filter helps enhance the image by sampling surrounding frames and upscaling the selected area, making details clearer.
How many frames are sampled when using the resolution filter in this example?
-The maximum number of frames sampled in this example is 51.
What is the effect of applying the fusion parameter in the resolution filter?
-The fusion parameter, when maximized, further enhances the clarity of the details on the license plate.
How does the contrast filter help in this enhancement process?
-The contrast filter helps darken the characters on the license plate and make them stand out against the background.
What additional tool is applied after the contrast filter?
-After the contrast filter, the sharpening tool is applied to further enhance the details of the license plate.
What is the effect of using the detail mode?
-Detail mode helps bring out more fine details in the characters on the license plate, though it may slightly distort other parts of the image.
How are snapshots created and saved after enhancing the license plate?
-Snapshots are created by right-clicking and selecting 'save as' for each enhanced image, specifying a save location for the files.
Outlines
🔍 Enhancing License Plate Visibility
This paragraph discusses a method for enhancing a license plate in a video for forensic analysis. The process begins by zooming in on the license plate and using the 'Region of Interest' tool to focus enhancement on that area. The resolution filter is then applied with a high frame sampling rate and a maximum super resolution factor to sharpen the image. Additional parameters like fusion and accuracy are adjusted to bring out the details of the characters on the plate. The contrast is increased to make the characters stand out against the background, and a sharpening tool is used to further enhance clarity. The 'Detail Mode' is considered for additional enhancement, and snapshots are taken with and without this mode enabled for comparison.
Mindmap
Keywords
💡License Plate
💡Region of Interest (ROI)
💡Resolution Filter
💡Super Resolution
💡Fusion Parameter
💡Accuracy Setting
💡Detail Mode
💡Contrast Filter
💡Sharpening Tool
💡Deep Learning
💡Snapshot
Highlights
Zoom in on the license plate for enhancement, focusing on the area of interest.
Enable the region of interest tool to target the license plate area.
Resize the region of interest box to only enhance the license plate, avoiding irrelevant parts like the ground.
Activate the resolution filter, which samples surrounding frames for better clarity.
Max out the sampling frames to 51 for better clarity and precision in the image.
Upscale the license plate using the super resolution factor to the maximum value.
Apply the fusion parameter and max it out to enhance the clarity of the license plate further.
Utilize the accuracy setting to refine the details, particularly around the edges of the characters on the plate.
Apply a contrast filter with default values to darken characters and make them more distinct.
Use the light color option to make the license plate characters stand out more from the background.
Apply the sharpening tool to further enhance the details of the license plate.
Use a deep learning tool to improve the overall enhancement of the image.
Test the detail mode to enhance the characters on the plate further while distorting other parts of the image slightly.
Take snapshots of the enhanced image, one with and one without detail mode enabled.
Save the final enhanced images by right-clicking and selecting 'save as' to specify the location.
Transcripts
in this next example we're going to look
at some methods for enhancing a license
plate in the canter forensic and so
first we're going to start by zooming in
on the area that we want to enhance in
this case it's going to be the license
plate on the back of the vehicle and
then the first thing we want to do is we
want to enable our region of interest
tool which we can do over here in our
mouths tools or by clicking on the
region of interest filter and then
select that tool so we can resize this
box bring it over to the area that we
want to enhance resize it accordingly
and so now what we're doing is we're
only going to be enhancing this area
within our region interest box since we
don't care about enhancing other things
in the video like the ground we may be
interested in enhancing other parts of
the vehicle later but for now we're just
going to focus on the license plates we
had drawn our region of interest
accordingly and we're going to start by
enabling our resolution filter there's a
much longer explanation for our
resolution filter works and some of our
other demo videos I will rehash that
here but basically we're going to start
by looking at the number of surrounding
frames that were sampling you can see
I'm just going to go ahead and max that
out at 51 frames and then we're going to
upscale using our super resolution
factor we're going to upscale it all the
way to the maximum value for and you can
see already we're starting to get a much
clearer picture of the characters on
this license by effect you can probably
almost read it now we're going to apply
some additional parameters within the
resolution filter go ahead and fire
fusion parameter go ahead and max that
out and we're going to apply our
accuracy setting and you can see we go
all the way over kind of exaggerated
some of these things but here we can
kind of see some of the detail edges
these characters a little bit more you
know kind of distorts other parts of the
age and then we might want to play with
using our detail mode once we apply some
other filters I'm gonna leave that
turned off for now next we're going to
start with our contrast filter and we're
going to just for the most what we're
going to use default values we shouldn't
have to make too many adjustments with
this example we'll start with our
contrast setting kind of darkens those
characters a little bit more on light
color is going to do the same it's going
to make it really stand out from the
background the license plate will apply
our sharpening tool and try with our
deep learn to all that kind of so that
helps a little bit as well and so now we
want to look at a see if our detail mode
will kind of help in this case and I
think it actually does in this case
going to bring them a little bit more
detail you know kind of distort some
other parts of the image so what we'll
do now that we have got a pretty pretty
good enhancement of this license plate
again just using a couple of simple
clicks a couple of filters without
adjusting we'll just do some default
settings we're going to create two
snapshots from this and we'll go ahead
and bring up our product list here we'll
go ahead and take a snapshot without the
detail mode enabled and we'll take a
snapshot with the detail mode enabled
and that's pretty much it and now all we
have to do is just right click and hit
save as for each of these images and
specify save location and we're done
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