Poisson Image Editing
ACM SIGGRAPH 2003 Papers, 2003 · paper · Computer science
Introduces image-editing tools based on solving Poisson equations. They allow seamless importing of opaque or transparent source regions into an image, and seamless changes to the texture, illumination or color within a selected region, or making a selection tileable.
Checked: PDF from cs.jhu.edu, fetched 4 Oct 2026. Page numbers are those of that PDF.
4 findings
Substance v_pq is defined as "the projection of v((p+q)/2) on the oriented edge [p,q], i.e., v_pq = v((p+q)/2)·\vec{pq}", but Eqs. (6), (11), (13) and (15) use the p − q orientation (e.g. v_pq = g_p − g_q).
- p. 3 Discrete Poisson solver, definition below Eq. (6)
vpq = v( p+q 2 )·⃗pq
- p. 3 Eq. (11)
vpq = gp −gq
- p. 3 Discrete Poisson solver, text after Eq. (6)
vpq = v( p+q
Only the authors can say what is right here.
Judge's note: Read Eqs. (6), (7) and (11) and the definition on the page 3 crops, and reworked the step myself. Taking \vec{pq} = q − p (the usual meaning, and the paper does not define it otherwise), a first-order expansion gives ∇g((p+q)/2)·(q−p) ≈ g_q − g_p. Eq. (11) instead sets v_pq = g_p − g_q. The objective (f_p − f_q − v_pq)^2 in (6) is a discretisation of |∇f − v|^2 only if v_pq ≈ v·(p − q). Differentiating (6) with respect to f_p gives (7), which is consistent with v_pq = g_p − g_q (the discrete Laplacian of g). So Eqs. (6), (7) and (11) agree with one another, and only the projection definition has the opposite sign. Only the authors can say whether \vec{pq} was meant to point from q to p.
Second check: another model agreed
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Substance Eq. (15), described as "the discrete version of (14)" with v(x) = M(x)∇f*(x), prints v_pq = "f_p − f_q if an edge lies between p and q" using the unknown f rather than the known image f* (f*_p − f*_q).
- p. 5 Section 4, Texture flattening, Eq. (15)
fp −fq if an edge lies between p and q,
- p. 5 Eq. (14)
v(x) = M(x)∇f ∗(x)
- p. 5 Section 4, Texture flattening, Eq. (15)
fp −fq
- p. 5 Eq. (15), Texture flattening
f_p − f_q if an edge lies between p and q
Judge's note: The page 5 crops show Eq. (14) with ∇f* and Eq. (15) with plain f_p − f_q; there are no asterisks. In the paper f is the unknown interpolant and f* the known image. The analogous discrete Eq. (13) (text layer lines 414–415) writes f*_p − f*_q explicitly. As printed, the guidance would depend on the unknown, and (7) would no longer have a fixed right-hand side. The evident fix is f*_p − f*_q.
Second check: another model agreed
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Reference or label First author of 'Object-Based Image Editing' printed as "BARRET, A." in the references and "[Barret and Cheney 2002]" in the text (likely Barrett, W. A.).
- p. 6 References
BARRET, A., AND CHENEY, A. 2002. Object-Based Image Editing.
- p. 2 Related work, in-text citation
[Barret and Cheney 2002
- p. 6 References, Barret and Cheney 2002
BARRET, A., AND CHENEY, A. 2002.
Only the authors can say what is right here.
Judge's note: Rests on outside knowledge: that the TOG 21(3) 2002 paper is by William A. Barrett and Alan S. Cheney. The page 6 reference crop shows 'BARRET, A., AND CHENEY, A.', and the page 2 citation shows 'Barret and Cheney 2002'. The paper is consistent with itself, so this cannot be settled from the files.
Second check: another model agreed
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Reference or label Bertalmio et al. 2000 reference gives "In Proceedings of ACM SIGGRAPH 2000, ACM Press / ACM SIGGRAPH, New-York, E. Fiume, Ed.", the same editor as the SIGGRAPH 2001 entries.
- p. 6 References, Bertalmio et al. 2000
In Proceedings of ACM SIGGRAPH 2000, ACM Press / ACM SIGGRAPH, New-York, E. Fiume, Ed.
- p. 6 References, Bertalmio et al. 2000
In Proceedings of ACM SIGGRAPH 2000,
Only the authors can say what is right here.
Judge's note: Rests on outside knowledge: that the SIGGRAPH 2000 proceedings were edited by K. Akeley and the 2001 proceedings by E. Fiume. The page 6 crops show 'E. Fiume, Ed.' on the 2000 entry and on the 2001 Hertzmann et al. entry. This points to a copy-paste slip, but it cannot be settled from the files.
Second check: another model agreed
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4 minor (typos and the like; most checked by the judge only)
Typo Permission footer reads "Permission to make digital/hard copy of part of all of this work"; the intended wording is "part or all".
- p. 1 Permission footer, p. 313
Permission to make digital/hard copy of part of all of this work
Judge's note: The crop of the page 1 footer shows 'part of all of this work' as printed, so this is not an extraction artefact. As printed the phrase is ungrammatical and the fix is obvious.
Second check: none (judge only)
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Typo Missing conjunction: "as in the face touch-up example in Fig. 2 (top row) the texture swap example in Fig. 4 (bottom row)" — 'and' is missing between the two examples.
- p. 3 Section 3, Importing gradients, 2nd paragraph
in Fig. 2 (top row) the texture swap example in Fig. 4 (bottom row)
- p. 3
the face touch-up example in Fig. 2 (top row) the texture swap example
Judge's note: The page 3 crop shows the two examples run together with no 'and' or comma between them. There is no line-break artefact.
Second check: none (judge only)
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Typo Reference title misspelled: "LAND, E., AND MCCANN, J. 1971. Ligthness and Retinex Theory." should read 'Lightness'.
- p. 6 References, Land and McCann 1971
Ligthness and Retinex Theory
- p. 6
LAND, E., AND MCCANN, J. 1971. Ligthness and Retinex Theory.
Judge's note: The reference-list crop on page 6 shows 'Ligthness' as printed. This is a plain misspelling of an English word.
Second check: none (judge only)
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Typo Co-author name in the Bolz et al. 2003 reference printed as "GRINPSUN, E." (likely 'Grinspun').
- p. 6 References, Bolz et al. 2003
GRINPSUN, E.
- p. 6
GRINPSUN, E., AND SCHR ¨ODER, P.
Only the authors can say what is right here.
Judge's note: Rests on outside knowledge: that the co-author's surname is Grinspun. The page 6 crop shows 'GRINPSUN, E.' as printed, so this is not an OCR artefact.
Second check: none (judge only)