When the Codec Hallucinates: User Perceptions of Miscompressed Images - Userstudy Dataset

image_dataset.csv

Provides detailed information for every image used in the study. Refer to Figure 4 in the paper for an overview; each box in the figure reflects one row in this table.

Columns

• ID: Unique identifier for each image sample, consisting of [version|name|group]
  • version:
    • J - JPEG-compressed
    • N - Neural-compressed
    • M - Miscompressed
    • U - Uncompressed
  • name: Five first digits of image name
  • group: Subject group that saw the image. [1...4], or 0 if all groups saw the image ("anchor image")
• ORIGNAME: Full name of the scene (original image)
• CROP: Size of the crop in pixels (quadratic)
• GROUP: Subject group that saw the image.  [1...4], or 0 if all groups saw the image ("anchor image")
• ORDER: Position in the instrument [1...12]
• UNCOMP: "1" if the image is uncompressed
• JPEG: "1" if the image isas JPEG
• JPEGQ: JPEG quality factor for JPEG compressed images
• NC: "1" if the image is neurally compressed
• NCQ: Compression codec for neurally compressed images
• MISCOMP: "1" if the image contains a miscompression

survey_responses.csv

For the corresponding questions, please refer to Appendix B.2 of the paper. Columns represent questions in chronological order, followed by timings.

Columns

• DEM- age, sex D1 - D3: demographic questions
• [version|name|group|question]: Image comparison
  • version:
    • J - JPEG-compressed
    • N - Neural-compressed
    • M - Miscompressed
    • U - Uncompressed
  • name: Five first digits of image name
  • group: Subject group that saw the image [1...4], or 0 if all groups saw the image ("anchor image")
  • question:
    • dif - S1: difference
    • mis - S2: misunderstandings [1...6], 1 = "certainly"
    • mod - S3(1): intentional editing [1...6], 1 = "certainly"
    • com - S3(2): uncontrolled distortion [1...6], 1 = "certainly"
• THE* C1(1 - 8): Theoretical knowledge
• PRA* C2(1 - 8): Practical experience
• VER* C3(1 - 6): Verification practices
• EXP* C4(1 - 2): Experience with image distribution
• interviewtime: Time to complete the whole survey [s]
• age, group, vis -Time: Demographics Time [s]
• [version|name|group|question] -Time: Image comparison time [s]
  • ...
  • question: 
    • dif
    • mis
    • modcom: mod and com together since on the same display
• the, pra, ver, exp -Time: Control variable's time [s]